CrunchLabs: Mark Rober's STEM Subscription Box — UK Guide 2026

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If your child has watched Mark Rober on YouTube — and with over 50 million subscribers, there's a good chance they have — they've probably already asked about CrunchLabs. The monthly STEM subscription box launched by the former NASA engineer and viral science communicator has become one of the most talked-about STEM toys in the world. But is it worth it for UK families? Here's everything you need to know.

What Is CrunchLabs?

CrunchLabs is a monthly subscription box designed to teach children aged 8 to 14 the fundamentals of engineering, physics, and problem-solving through hands-on building projects. Each month, subscribers receive a box containing all the parts, tools, and instructions needed to build a specific science or engineering gadget — along with a specially recorded video from Mark Rober himself walking kids through the build.

The philosophy behind CrunchLabs is rooted in Mark Rober's real experience: learning by doing. Rather than passive videos or app-based games, CrunchLabs gets kids building real physical objects and understanding the science that makes them work. The brand's tagline is "Build Something Cool" — and they mean it literally.

While you wait for your CrunchLabs box — international shipping can take 2-4 weeks, so many UK parents pair their subscription with an in-stock STEM kit from Amazon UK to keep their kids building straight away. Our top three picks for the same 8-14 age bracket: the LEGO Boost Creative Toolbox for confident builders, the Makeblock mBot2 for budding roboticists, and the BBC micro:bit V2 for kids who lean towards coding.

Who Is It For?

CrunchLabs is aimed primarily at children aged 8 to 14, though many younger children (especially confident builders around age 7) can participate with a bit of parental help, and older teenagers often enjoy it too.

The box is not coding-focused — it's more about mechanical engineering, physics, and creative design. If your child loves taking things apart, building with Lego Technic, asking "how does that work?", or watching engineering content on YouTube, CrunchLabs is likely to be a hit. It's also an excellent choice for children who find traditional classroom science dull but come alive when given a hands-on challenge.

What's Inside Each Box?

Each CrunchLabs box contains:

• A unique buildable project — past projects have included a motorised dart gun, a spinning top launcher, a robotic claw, a catapult, and a light-up rocket model
• All the parts and components needed to complete the build — no extra shopping required
• A step-by-step instruction booklet written in an approachable, kid-friendly style
• A QR code linking to Mark Rober's exclusive build-along video, where he explains the science and engineering behind each project in his signature enthusiastic style
• A "hack" challenge — an open-ended extension activity that encourages children to modify or improve their build

The builds are designed to be completed in one or two sessions (typically 1-3 hours depending on the child's age and experience) and result in a working, playable gadget — not a decorative model that sits on a shelf.

UK Availability and Shipping

This is where things get slightly complicated for UK families. CrunchLabs is an American company, and while they do ship to the UK, it comes with some important considerations:

Shipping costs: International shipping adds a meaningful cost to each box. Expect to pay around £8-£15 per box in shipping fees on top of the subscription price, depending on current rates.

Import duties: UK customs may apply import duties and VAT on incoming parcels, particularly those with declared values over £135. This is not guaranteed every month, but it's a real possibility and can add an unexpected cost.

Delivery times: Boxes typically take 2-4 weeks to arrive in the UK after dispatch, so there can be a noticeable delay between the US release and UK delivery.

Subscription price: At the time of writing, CrunchLabs subscriptions start at approximately $29.99 USD per month for a monthly plan, with discounts for 3-month, 6-month, or annual subscriptions.

Despite these added costs and complexities, many UK families find the subscription worthwhile — particularly because there is currently no direct UK equivalent at the same level of quality and excitement.

CrunchLabs vs Other UK STEM Kits

How does CrunchLabs compare to what's available in the UK market?

CrunchLabs stands out for the quality and excitement of its engineering projects and the celebrity factor of Mark Rober's involvement. For children specifically interested in mechanical engineering and physics, it has few direct competitors at this level.

Kiwi Crate (from KiwiCo, also available in the UK with dedicated UK shipping) is a closer alternative, offering a range of age-specific subscription boxes with different themes. However, the builds tend to be simpler and more craft-focused than CrunchLabs.

Three UK-Available STEM Kits We'd Pair With CrunchLabs

If your child is excited about CrunchLabs but you want something they can start building tonight — or if you're not yet ready to commit to a US subscription — these three Amazon UK kits cover the same engineering-and-physics ground at different price points.

1. LEGO Boost Creative Toolbox

The closest spiritual cousin to CrunchLabs in the LEGO range. Kids build five different motorised robots (including Vernie the robot and the M.T.R.4 vehicle) and program them with a free tablet app. The engineering-and-coding blend is exactly the kind of "build then make it do something" experience CrunchLabs trades on.

Best for: Ages 7-12, confident builders.

Check the latest price on Amazon UK →

Read our full [[lego-boost-review | LEGO Boost review]] for the long-form take.

2. Makeblock mBot2

A genuine programmable robot with sensors, motors, and a colour LED matrix — and a great gateway into Scratch and Python. Where CrunchLabs trains engineers, the mBot2 trains coder-engineers. It's the kit we recommend most often for the 8-14 bracket on Amazon UK.

Best for: Ages 8-14, kids interested in coding as well as building.

Check the latest price on Amazon UK →

Read our full [[makeblock-mbot2-review | Makeblock mBot2 review]].

3. BBC micro:bit V2

The lowest-cost entry point at around £15-£20. The official UK schools coding board — used in classrooms across the country — pairs beautifully with the kind of "build a gadget" mindset CrunchLabs encourages. Add a starter kit and your child can build everything from step counters to fitness trackers to remote-controlled cars.

Best for: Ages 8+, coding-curious kids, school-age learners.

Check the latest price on Amazon UK →

Read our full [[bbc-microbit-v2-review | BBC micro:bit V2 review]].

For younger siblings (ages 5-8) who want to join in, the [[snap-circuits-jr-plus-sc110-review | Snap Circuits Jr Plus]] is a brilliant first electronics kit and is in-stock on Amazon UK.

Is the Mark Rober Factor Worth It?

For children who are already fans of Mark Rober's YouTube channel, the personal video component is a genuine differentiator. His videos make children feel like they're building alongside a real NASA engineer and science celebrity — which can be hugely motivating for reluctant learners or children who've never found science engaging before.

Parents frequently report that their children who "hate school" or "don't like homework" will happily spend hours on a CrunchLabs build and then watch the accompanying video multiple times. The engagement factor is real and significant.

Practical Tips for UK Families

• Start with a longer subscription plan if you're committed — the per-box cost comes down and you'll save on repeated international shipping fees.

• Gift subscriptions are available and are increasingly popular for birthdays and Christmas for UK children in the 8-14 age range.

• Check the CrunchLabs website for UK-specific promotions — they periodically offer reduced shipping rates for international orders.

• Consider a group subscription with another family — children can swap boxes and build together, doubling the content for the same cost.

• Supplement with KiwiCo if you want a more reliably UK-accessible alternative in months where international shipping proves too costly or slow.

Our Verdict

CrunchLabs is one of the most genuinely exciting STEM subscription boxes available anywhere, and for children aged 8-14 with an interest in engineering and building, it delivers exceptional value in terms of engagement and learning. The international shipping situation adds cost and complexity for UK families, but many parents feel it's worth it for the quality and the unique Mark Rober experience.

If your child is already a fan of Mark Rober's YouTube content, the decision is even easier. CrunchLabs is effectively the physical extension of a channel they already love — and turning passive watching into active building is exactly the kind of learning leap that STEM education is all about.

For a genuinely UK-accessible alternative with similar engineering focus, KiwiCo's Tinker Crate (aimed at ages 9-16) is the closest competitor and ships directly from UK warehouses.

Quick Buy: UK-Available STEM Kits

If you'd rather have something in your child's hands this week instead of waiting for international shipping, here's our shortlist again with direct Amazon UK links:

• LEGO Boost Creative Toolbox — five robots, free coding app, ages 7-12
• Makeblock mBot2 — proper programmable robot, Scratch and Python, ages 8-14
• BBC micro:bit V2 — the UK schools coding board, ages 8+, under £20
• Snap Circuits Jr Plus — first electronics kit for younger siblings, ages 5-8

For more options across the 8-12 age bracket, our [[best-coding-robot-kits-8-12-year-olds-uk-2026 | Best Coding Robot Kits for 8-12 Year Olds UK 2026]] roundup compares the full UK market side by side. For STEM kits under £100, see our [[best-stem-kits-under-100-uk-2026 | Best STEM Kits Under £100 UK 2026]] guide.

Prices and availability correct as of May 2026. As an Amazon Associate, AIToys.co.uk earns from qualifying purchases.