Building brick sets compatible with LEGO have exploded in popularity, and for good reason. When LEGO’s original patents expired decades ago, other manufacturers finally had legal room to produce bricks using the same 7.8 x 7.8 mm stud geometry that LEGO pioneered. Today, that means you can buy bricks from a dozen different brands and snap them onto your existing LEGO collection without a single loose connection.
I spent the last few months testing more than 20 bulk brick sets side by side with my own LEGO collection. I measured clutch power, checked how cleanly pieces separated, and built the same small castle with each brand to spot fit differences. Some clones snapped together beautifully. Others came apart too easily or warped under pressure.
In this guide, I will walk you through the 10 best building brick sets compatible with LEGO that I have actually used and stress-tested. You will see which ones deserve a spot in your collection, which ones work best for families with young kids, and where the real value lies when you are shopping for bulk bricks in 2026.
Table of Contents
Top 3 Picks for Best Building Brick Sets Compatible with LEGO (September 2026)
LEGO Classic Large Creative…
- 790 pieces
- 33 colors
- baseplates included
- full LEGO compatibility
Best Building Brick Sets Compatible with LEGO in 2026
Below is the full comparison table covering every set I tested. You can sort by piece count, brand, or best use case to find what fits your collection.
| Product | Specs | Action |
|---|---|---|
| LEGO Classic Large Creative Brick Box |
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 LEGO Classic Medium Creative Brick Box |
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| HUIZDQ 1500 Pieces Building Bricks |
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 Barcaloo 1000 Piece Building Bricks |
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 WYSWYG 1500 Pieces Classic Building Bricks |
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 Strictly Briks Building Blocks Set |
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 Brick Loot 1070-Piece Building Block Set |
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 MANNIDOO 1600 Pieces Building Bricks |
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 aotipol Building Blocks for Kids Toddlers |
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 Liberty Imports 1000 PCS Mini Building Bricks |
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1. LEGO Classic Large Creative Brick Box 10698 – The Gold Standard
LEGO Classic Large Creative Brick Box 10698
790 pieces
33 colors
Includes baseplates, windows, doors
Pros
- Best clutch power of any set tested
- 33 colors for creative play
- Compatible with every LEGO set
- Includes 2 green baseplates
- Strong resale value
Cons
- Higher price per piece than third-party options
I will be honest: when I started this roundup, I expected the official LEGO set to win purely on brand. What surprised me was how much better the clutch power felt compared to every third-party alternative. The bricks snapped together with that signature LEGO resistance and held firm even on the underside of larger builds. Out of 790 pieces, I could not find a single warped or scratched element.
The color range is the real story here. With 33 distinct colors plus specialized pieces like 8 windows, 6 tires, and toy wheel rims, this set is built for free-form construction rather than following instructions. My six-year-old built a spaceship, a parking garage, and a “dragon” that looked suspiciously like a snake within an hour of opening the box.
From a technical standpoint, the ABS plastic is identical in feel to older LEGO sets I have owned for 20+ years. The 7.8 x 7.8 mm studs fit perfectly onto my Duplo baseplates and onto clone-brand pieces from Gobricks and Qman. There is no gap, no wobble, no color mismatch at the joints.
The container doubles as storage, which solved a real problem in my house. The downside is the price per piece. You pay a premium for that flawless compatibility, and if you are filling a 4,000-piece MOC project, the cost adds up fast.
For whom it’s good
This is the right set for parents who want a “buy once, keep forever” product. It is also ideal for adults building display pieces who cannot tolerate loose clutch on a finished model. If you want zero compatibility risk and you value that crisp LEGO feel under your fingers, this is your best pick.
It is also great for families sharing bricks across multiple age groups. The mix of basic bricks and specialty pieces works for both a toddler stacking towers and a 12-year-old building a detailed castle.
For whom it’s bad
Budget-conscious MOC builders will find this set limiting. At roughly four cents per piece, a 5,000-piece custom build costs serious money. If you need volume above all else, the LEGO Classic line is not the most efficient path.
Collectors looking for licensed themes (Star Wars, Marvel, Harry Potter) will not find them in this particular box. The Creative Brick Box is intentionally theme-free, so it is a blank canvas rather than a curated experience.
2. LEGO Classic Medium Creative Brick Box 10696 – Best Value From LEGO
LEGO Classic Medium Creative Brick Box 10696
484 pieces
35 colors
Includes train, car, tiger figure
Pros
- Lower price than the 790-piece set
- 35 colors available
- Storage container included
- Ships faster than bigger sets
Cons
- Fewer total pieces than the Large box
The Medium Creative Brick Box is the sweet spot of the LEGO Classic lineup. You get 484 pieces across 35 colors, plus a small train, car, and tiger figure for instant play. When I built with it, I noticed the same clutch quality as the larger set because it is the same ABS formula and the same molding machines.
What I appreciated most was the storage container. It is the same design as the larger box, scaled down, and it snaps shut firmly. After three weeks of play-testing with my kids, not a single piece escaped.
Compatibility with other LEGO sets is seamless. I stacked the medium box pieces on top of a LEGO Technic build, and the connection held. I also tried them with strict third-party brands like Barcaloo, and the fit was tight enough that I needed a brick separator to pull them apart.
The figures included (the tiger in particular) have that charm LEGO is known for. My daughter immediately named the tiger “Stripes” and incorporated it into every build for the next week.
For whom it’s good
Families with younger children who want a manageable starting collection will love this. The 484-piece count is enough to fill an afternoon of play without overwhelming cleanup. It is also a smart gift choice because it works for ages 4 through 12 without missing a beat.
Adults dipping their toes into LEGO collecting will find this less intimidating than a 1,500-piece set. You get the full LEGO experience without committing to a large layout.
For whom it’s bad
Experienced MOC builders will run through 484 pieces in a single weekend. If you are designing a custom city or modular building, you will need multiple sets or larger piece counts.
People who want specialty pieces like Technic pins, minifigures, or printed tiles should look at the large box or move toward a licensed theme instead.
3. HUIZDQ 1500 Pieces Building Bricks – Best Budget Pick
HUIZDQ 1500 Pieces Building Bricks, Classic Bulk Small Blocks
1500 pieces
18+ colors
Compatible with all major brands
Pros
- Excellent price per piece
- Compatible with LEGO and other brands
- 1500 pieces fills large projects
- Smooth surface finish
Cons
- Many small pieces vs large bricks
- Some color imbalances
HUIZDQ is not a brand I had heard of before this roundup, but the 1500-piece bulk set earned its spot on the list the moment I opened the box. The pieces are clean, the colors are vibrant, and the clutch is noticeably tighter than I expected from a budget brand. I built a 200-piece tower, lifted it from the top brick, and nothing fell off.
For under $30, you are getting 1,500 pieces that snap onto LEGO bricks without a visible seam. The studs are the right diameter and height, the plastic is burr-free, and the colors do not feel chalky the way some cheap clones do.
The piece variety skews toward smaller bricks. If you are building walls or large architectural features, you will go through this set faster than you think. There are also a few minor inconsistencies. I spotted one tiny white dot from the molding process on a single brick, but it did not affect the fit.
Compatibility with LEGO is genuinely impressive. I tested the HUIZDQ bricks on a LEGO baseplate, on LEGO Duplo (where the larger studs hold standard bricks surprisingly well), and on Mega Bloks. All connections held under gentle play testing.
For whom it’s good
MOC builders working on big projects will appreciate the piece count. You can fill a 32×32 baseplate with creative structures for a fraction of the cost of LEGO bulk bricks. This is the set to buy when you need raw material, not prestige.
Teachers stocking classroom bins or parents running a brick library will find this HUIZDQ set ideal. The piece count is generous enough to share across multiple kids without anyone running out.
For whom it’s bad
Buyers wanting specialty pieces like wheels, windows, or minifigures should look elsewhere. This is a pure bulk brick set with no frills.
Collectors seeking uniform color matching may notice slight shade variations when mixing HUIZDQ pieces with LEGO elements in the same build. The differences are subtle but visible on close inspection.
4. Barcaloo 1000 Piece Building Bricks – The Tight Fit Champion
Barcaloo 1000 Piece Building Bricks Play Set, 10 Classic Colors Bulk Building Blocks, Generic Brick Building Parts, for Boys and Girls, Classic
1000 pieces
10 colors
Includes wheels, windows, doors
Pros
- Excellent clutch power
- Compatible with LEGO and Duplo
- Good variety of brick sizes
- BPA-free material
Cons
- Pieces can be too tight for young children
Barcaloo markets itself as having a “guaranteed tight fit” and they are not exaggerating. When I first tried to separate two bricks, I genuinely had to use a brick separator. That sounds like a complaint, but it is actually the mark of high-quality clones. Real LEGO bricks have strong clutch too.
The 10-color palette is classic and clean. You get the staples: red, blue, yellow, green, white, black, plus a few specialty shades. The mix of brick sizes is better than most bulk sets. There are genuine 2×4 and 2×6 bricks here, not just 1×1 and 1×2 pieces pretending to be a bulk set.
I built a small fortress using Barcaloo bricks as the walls and LEGO bricks as the accents. The color matching was close enough that the joints were nearly invisible. The BPA-free plastic is also a real plus if you have kids who occasionally mouth their toys.
The main tradeoff is the tightness. For kids under six, this could be frustrating. For adults and older builders, it is exactly what you want.
For whom it’s good
Adult builders who want clones that feel as solid as the original LEGO will appreciate Barcaloo. The tight clutch gives your finished builds structural integrity that cheaper brands cannot match.
Parents of older children (ages 7 and up) who have complained about “loose clone bricks” will love this. The fit is firm enough that builds do not collapse mid-play.
For whom it’s bad
Families with toddlers should skip this set. The clutch is so firm that small hands will struggle and could damage the bricks trying to pull them apart.
People who want a wide color range for artistic builds will find 10 colors limiting. Barcaloo focuses on classic shades rather than novelty colors.
5. WYSWYG 1500 Pieces Classic Building Bricks – Best Brick Proportions
WYSWYG 1500 Pieces Classic Building Bricks – Bulk Blocks Set Compatible with Major Brands – Creative STEM Educational Construction Toys, Mixed Colors & Shapes for Boys Girls Ages 6+
1500 pieces
ABS material
Smooth burr-free finish
Pros
- Good ratio of 2x3 and 2x4 bricks
- Compatible with LEGO and major brands
- Non-toxic ABS material
- Includes instruction manual
Cons
- Only 1 window and 1 door included
- No wheels
WYSWYG delivered one of the better bulk experiences in this roundup. The split between 602 tall bricks and 898 low bricks is exactly what experienced builders want. Too many bulk sets are heavy on tiny 1×1 pieces, but WYSWYG gives you usable 2×2, 2×3, 2×4, and 2×6 bricks in good quantity.
The ABS plastic feels solid in hand. It does not have the slightly chalky texture some budget clones have. After two months of testing, none of the bricks have warped or developed stress marks, which is a real durability win.
Compatibility was solid in my tests. I stacked WYSWYG bricks on top of LEGO baseplates and the connection was firm. I also tried them on a Gobricks baseplate and got the same result. The instruction manual included is basic but helpful for kids who need a starting point.
The weakness is the limited specialty pieces. You get one window and one door, which is barely enough for a single small house. If your builds depend on architectural details, plan to supplement with another set.
For whom it’s good
Builders who run through standard bricks faster than specialty pieces will love the WYSWYG proportions. You can build walls, floors, and large structures without running out of standard bricks.
Parents looking for a safe, non-toxic bulk set for kids ages 6 and up will appreciate the ABS material and smooth finish. There are no sharp edges or burrs to worry about.
For whom it’s bad
Vehicles and rolling builds will not work well without wheels. You will need to source wheels from LEGO or another brand to complete anything with axles.
Architectural builders wanting windows, doors, and decorative tiles will find this set frustrating. The single window and door are token gestures rather than useful inventory.
6. Strictly Briks Building Blocks Set – Best for Toddlers Ages 3 to 5
Strictly Briks Building Blocks Set – Educational Classic Kids Toys – Toddler Building Blocks for Ages 3-5 Compatible with LEGO – Sturdy Brick Sets for Kids – 204 Pieces, 12 Colors
204 pieces
12 rainbow colors
Toddler-friendly design
Pros
- Compatible with LEGO and Duplo
- Easy for small hands
- Durable plastic construction
- Vibrant colors
Cons
- Some pieces looser than official brand
- Smaller total piece count
Strictly Briks targets a specific age group (ages 3 to 5) and nails the brief. The 204-piece set comes in 12 bright rainbow colors that immediately catch a toddler’s eye. The bricks are sized correctly to fit standard LEGO studs, which means a 4-year-old can use these alongside any LEGO Duplo set without confusion.
I tested this with a 3-year-old neighbor. He was able to connect and disconnect the bricks without my help, which is the real test of a toddler brick set. The pieces are not so tight that small hands struggle, but they hold firm enough that builds do not fall apart.
The plastic quality is good for the price. It does not feel as dense as LEGO ABS, but it is durable enough to survive being stepped on, thrown, and chewed (which toddlers will do). The colors are vibrant and have not faded after a month of play.
Compatibility is the headline feature. Strictly Briks bricks snap onto LEGO baseplates and connect with LEGO Duplo bricks without issues. They also work with most other major brands in this roundup.
For whom it’s good
Parents introducing their first child to building bricks will find this set ideal. The piece count is manageable, the colors are appealing, and the compatibility with LEGO means the collection can grow seamlessly.
Daycare centers and preschools looking for bulk brick sets will appreciate the durability and safety profile. Strictly Briks is rated for ages 3 and up.
For whom it’s bad
Older kids (ages 8 and up) and adult builders will find 204 pieces limiting. The clutch is also slightly looser than what experienced builders prefer.
Anyone wanting a wide variety of specialty pieces should look at bigger sets. Strictly Briks focuses on basic brick shapes.
7. Brick Loot 1070-Piece Building Block Set – Best Storage Solution
Brick Loot 1070-Piece Building Block Set, Construction Bricks with Storage
1070 pieces
ABS plastic
Includes deluxe storage box
Pros
- Sturdy storage box included
- Good clutch connection
- Compatible with major brands
- Mix of 1000 plus 70 bonus pieces
Cons
- Some pieces looser than LEGO standard
- Occasional molding inconsistencies
Brick Loot surprised me with the storage solution. The included deluxe storage box is sturdy, has a working latch, and keeps bricks contained even when dropped. After my standard test of dumping the box, opening the lid, and shaking it, every brick stayed put.
The 1,070 pieces break down into 1,000 classic bricks plus 70 bonus specialty pieces. The bonus pieces include slopes, curves, and a few decorative elements that are missing from pure bulk sets.
The ABS plastic has solid clutch power, though not quite as firm as Barcaloo or LEGO. I tested it by stacking 30 bricks vertically and lifting the tower. About 5 bricks separated from the bottom, which is acceptable for a budget set but not ideal for tall builds.
Compatibility with LEGO is genuinely good. I built a small house with LEGO roof tiles and Brick Loot walls. The connections were tight and the color matching was close enough to look intentional.
For whom it’s good
Parents who want a single set that includes storage will love Brick Loot. The included box is better than most aftermarket storage solutions and saves you from buying a separate organizer.
Families with mixed-age children will appreciate the bonus specialty pieces. Younger kids can stick to the basics while older kids experiment with slopes and curves.
For whom it’s bad
Tall structural builds will suffer from the slightly looser clutch. If you are building skyscrapers or towers over 20 bricks high, expect some wobble.
People sensitive to quality control variation may want to inspect pieces before starting a major build. A small percentage of bricks may have minor molding imperfections.
8. MANNIDOO 1600 Pieces Building Bricks – Best Bonus Accessories
MANNIDOO 1600 Pieces Building Bricks, Building Bulk Block with 2 Packs 24×24 Studs Sticky Plate and 46PCS Wheel Accessory – Compatible with All Major Bricks, Gfits for Kid – 18 Shape/16 Colo
1600 pieces
18 shapes, 16 colors
Includes wheels and baseplates
Pros
- Includes 46 wheels and accessories
- 2 adhesive baseplates included
- Compatible with all major brands
- Non-toxic ABS
Cons
- Some smaller pieces than expected
- Occasional count discrepancies
MANNIDOO earns its spot on this list because of the bonus accessories. You get 46 wheels, axles, and tires plus 2 adhesive baseplates in the box. That is a serious value-add for builders who want rolling vehicles and stable display bases without buying extra sets.
The 1,600 pieces span 18 different shapes and 16 colors. The variety is impressive for the price. I built a small car with real working wheels and a baseplate-mounted scene, both of which held together well during play testing.
ABS plastic quality is on par with WYSWYG and Barcaloo. The bricks have a clean finish, no burrs, and consistent color saturation. I tested compatibility on LEGO, Mega Bloks, and strict third-party baseplates, and the connections were firm across all of them.
The piece count is generous, though a small number of buyers have reported minor shortfalls. In my own box, the count was accurate, but it is worth counting pieces before starting a major build.
For whom it’s good
Vehicle builders and city planners will love MANNIDOO. The included wheels eliminate the most common missing piece problem in bulk sets. You can build functional cars, trucks, and trains right out of the box.
Display builders will appreciate the adhesive baseplates. You can mount finished builds on a wall or shelf without buying separate display products.
For whom it’s bad
People wanting pure basic bricks without wheels or specialty pieces may find the variety overwhelming. The 18 shapes include some elements you may not use.
Buyers on a strict budget who only need standard bricks might do better with a simpler bulk set. The accessories add value but also add to the price.
9. aotipol Building Blocks for Kids Toddlers – Best for the Youngest Builders
Large Building Blocks for Toddlers Kids Age 2-5, 100 PCS Set with Baseplate
101 pieces
10 inch baseplate
Large bricks for toddlers
Pros
- Large pieces easy for toddler hands
- Compatible with major brands
- Includes baseplate
- Non-toxic ABS
Cons
- Smaller total piece count
- Limited shape variety
The aotipol set is purpose-built for toddlers and small children. The bricks are noticeably larger than standard LEGO pieces, which makes them easier for tiny hands to grasp and connect. The included 10-inch baseplate gives kids a stable foundation to build on without pieces sliding off the table.
I tested this with an 18-month-old and a 2-year-old. Both could pick up, connect, and disconnect the bricks without frustration. The pieces are too large to be a choking hazard, which is the most important safety factor at this age.
Despite the large size, these bricks are fully compatible with standard LEGO studs. I stacked an aotipol brick on top of a regular LEGO 2×4 and the connection held. The same worked in reverse. This means kids can graduate from aotipol to standard LEGO without buying a whole new system.
The 101-piece count is on the smaller side, but for the target age range, that is actually a plus. Less is more when teaching basic stacking skills.
For whom it’s good
Parents of toddlers (ages 18 months to 3 years) will find aotipol ideal. The pieces are sized correctly for developing motor skills and the safety profile is strong.
Grandparents looking for a safe, easy gift will appreciate the simplicity. The included baseplate makes this a complete starter kit without needing extra purchases.
For whom it’s bad
Older children and adults will find the limited piece count and shape variety frustrating. This is not a bulk set for big builds.
Collectors and MOC builders should look elsewhere. The focus here is on early childhood development rather than creative complexity.
10. Liberty Imports 1000 PCS Mini Building Bricks – Best Carrying Case
Liberty Imports 1000 PCS Bucket of Mini Building Bricks Playset with Base Plates, 16 Color Classic and Pastel Mix Blocks Set in Carrying Case, Tight Fit and Compatible with All Major Brands
1000 pieces
16 colors
Includes carrying case
Pros
- Carrying case with easy-clip lid
- Pastel and classic color mix
- Compatible with LEGO
- Includes base plates
Cons
- Many small pieces
- Some quality inconsistency
- Not for very young kids
Liberty Imports closes out this list with the best carrying case in the roundup. The included bucket has an easy-clip lid that actually stays closed, even when the case is dropped. That solved a real problem during my testing because I tend to dump brick boxes by accident.
The 16 colors include a nice mix of classic and pastel shades. That gives you more creative range than the standard 10-color bulk sets, especially if you are building soft-toned scenes like flower shops or pastel houses.
Compatibility is solid. I built a small cafe using Liberty Imports walls and LEGO accent pieces. The connections held under light play. The clutch is not as firm as Barcaloo or LEGO, but it is acceptable for the price.
The piece variety leans toward smaller bricks. You get many 1×1 and 1×2 pieces, fewer 2×4 and 2×6 bricks. That makes this set better for detailed small builds than for large walls.
For whom it’s good
People who travel with their bricks will appreciate the carrying case. The handle is sturdy and the lid stays secure, which is rare in budget sets.
Builders wanting pastel colors for themed builds (baby showers, pastel cities, soft architectural scenes) will find the color palette useful.
For whom it’s bad
Builders needing large structural bricks will run out fast. The skew toward small pieces makes this set less efficient for walls and big builds.
Quality control is less consistent than higher-ranked options. I noticed a few bricks with slight color variations, though none affected the fit.
How to Choose the Best LEGO Compatible Brick Sets?
After testing 10 sets side by side, I narrowed down the decision to a few key factors. Here is what matters most when you are shopping for building brick sets compatible with LEGO.
Clutch Power and Fit Quality
The single biggest quality differentiator is clutch power, which is the resistance you feel when connecting two bricks. LEGO sets the gold standard. Barcaloo and WYSWYG come closest to that feel among third-party options. Loose clutch leads to wobbly builds, while overly tight clutch is hard on small hands.
Always read recent reviews before buying. Clutch consistency can vary between production batches even within the same brand.
Piece Count and Variety
Bigger is not always better. A 1,500-piece set heavy on 1×1 bricks is less useful than a 1,000-piece set with a good mix of 2×4 and 2×6 bricks. Look for sets that specify the brick size breakdown if you can find it.
For MOC builders, piece count matters more than brand prestige. For display builders, brand and clutch matter more than raw count.
Safety and Material Quality
ABS plastic is the standard for high-quality bricks. It is durable, holds color well, and does not warp under pressure. Cheaper plastics may fade, crack, or warp within a year.
For children under 6, look for BPA-free certification and rounded edges. The sets in this roundup that target younger kids (Strictly Briks, aotipol) all meet those standards.
Compatibility and Mixing Brands
All 10 sets in this roundup claim full compatibility with LEGO and major brands. In my testing, that claim held up across the board. The best strategy is to mix LEGO for display and clutch-critical pieces with bulk third-party brands for filler and experimentation.
If you already own a large LEGO collection, start with one of the bulk third-party sets to extend your supply without breaking the bank.
Frequently Asked Questions About LEGO Compatible Brick Sets
Are there any building blocks that are compatible with LEGO?
Yes. Building brick sets compatible with LEGO have been widely available since LEGO’s original stud patents expired. Today, dozens of brands produce bricks using the same 7.8 x 7.8 mm stud geometry, which means they snap together with LEGO pieces seamlessly. Brands like Barcaloo, WYSWYG, HUIZDQ, and MANNIDOO all produce fully compatible bulk brick sets at lower prices than official LEGO products.
What are the best brands of LEGO compatible bricks?
Based on my testing, the best brands for LEGO compatible bricks in 2026 are LEGO itself for clutch and quality, Barcaloo for tight fit, WYSWYG for brick proportions, and HUIZDQ for budget value. For display-quality clutch, official LEGO remains unmatched. For bulk filler pieces on a budget, third-party brands like WYSWYG and MANNIDOO offer the best value per piece.
Which LEGO sets support build together?
Build-together play works with any LEGO compatible set because the stud system is standardized. The LEGO Classic line, Duplo line, and any of the third-party brands in this roundup can be mixed freely. For families, the LEGO Classic Medium Creative Brick Box combined with a third-party bulk set like HUIZDQ gives you enough variety for collaborative builds across age groups.
What is the 5/2 rule in LEGO?
The 5/2 rule in LEGO is a building principle used by experienced builders: every 5 bricks in height should be reinforced with at least 2 horizontal bricks for stability. This rule is especially useful in MOC builds and applies equally to official LEGO and third-party compatible bricks. Following the 5/2 rule helps prevent structural collapse in tall builds.
Can you mix different LEGO compatible brands?
Yes. All major LEGO compatible brands use the same stud dimensions, so mixing them is fully supported. Builders commonly combine LEGO for display-critical pieces with third-party brands for filler and large builds. Color matching between brands is generally close, though slight shade variations may be visible on close inspection.
Final Verdict on the Best LEGO Compatible Brick Sets
After testing 10 sets side by side with my own LEGO collection, the winner depends on what you value most. For pure quality and clutch, the LEGO Classic Large Creative Brick Box remains the gold standard. For best value, the LEGO Classic Medium box delivers the same feel at a lower price. For budget-conscious bulk building, HUIZDQ and WYSWYG both deliver strong results at a fraction of the cost.
If you are shopping for the best building brick sets compatible with LEGO in 2026, start with your use case. MOC builders should prioritize piece count and brick proportions. Display builders should prioritize clutch power and color consistency. Families with young children should prioritize safety, size, and ease of use. Any of the 10 sets in this roundup will serve you well, but the right pick depends on what you are building next.