Incredible monthly science experiments

Everything you need to inspire your little scientist in a flexible and convenient subscription.

The Investigate Box series and the Explore Box series.

Send your little scientist on an unforgettable adventure with a unique series of science kits. 

Chain Reactions Explore Box science kit for children

Choose the Explore Box to get a box of 3-4 experiments and projects.

Waste of Space Investigate Box science kit for children

Choose the Investigate Box to get a bumper box of 6-9 big experiments and projects plus collectable lab equipment.

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Kids Science Kits and Subscription Boxes


Awesome hands-on science experiments that surprise and delight every time.


You can pause your subscription and restart it at any time.


The kits fit through most letterboxes with everything you need for all the experiments.


Joyous experiences with science that will last a life time. 


Discover the real science behind incredible phenomena in a way that is accessible to all ages. 

Great value

From £11.25/month for three exciting science experiments!


As Albert Einstein said “Imagination is more important than knowledge”. It’s our mission to inspire and engage little scientists with the wonders of nature, to nurture their curiosity and motivate them to make new discoveries. 

What is Letterbox Lab?

These are the only science kits that come as a series that build upon each other and take your child on a science adventure lasting a whole year.

Each kit has experiments and projects from different areas of science and engineering.

Your little scientist will be joined on this journey by Meg and Pico in our fun and easy to follow instruction comics.

MagnetoSlime Investigate Box slime magnet science kit for children

Fun Children’s Science Kits

Make a self-inflating balloon

Perform glow in the dark chemistry

glowing liquid icon

Make slippery slimes

slime icon

Launch rockets

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Create colourful concoctions

Build a robotic hand

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a girl making a liquid rainbow with letterbox lab science equipment

“She was completely engrossed in the experiments throughout and can not wait for the next box to arrive! … “

“The box is great value for money…the quality and presentation excellent.”  

Patricia (Busy Mum of Girls)

Letterbox Lab supplies series of science kits that gradually build skill and knowledge over time.

What’s in the science subscription boxes?

Contents of science subscription box

Read what the parents say…

“These are great! Was really impressed with the way everything is set out, each experiment in separate labelled bags, making it very easy to find what you need. Knowing you don’t have a dash to the supermarket to buy extra ingredients is fantastic too. It’s also aligned to the curriculum and key stages so perfect for home education.”

Sarah, via Facebook

“We love Letterbox Lab, we have tried a few of the others that are out there but letterbox lab is definitely the best! We subscribe to this for my 5 year old but find that her older siblings join in too. Love it! “

Leanne, via Facebook

“Letterbox Lab is truly exceptional – my son absolutely loves it. We homeschool, and this is the best educational subscription box I’ve found. The experiments are so much fun, and there’s a definite progression through each month’s theme as you follow the experiments. This is a box that takes science education seriously and doesn’t condescend to, or underestimate children’s ability to understand scientific principles. My son has learned so much from Letterbox Lab – I couldn’t be happier!”

Jo, via Facebook

Try the first box

All of our unique science kits can be purchased without subscribing.

Investigate Box 1:
Marvellous Mixtures
The Investigate Box is a science subscription box from Letterbox Lab that puts incredible science experiments for kids age 8+ through your letterbox.
Explore Box 1:
Hidden Rainbows
The Explore Box monthly science subscription box

As Seen In…

The Guardian
BBC's The Customer is Always Right
The School Run
The Paphitis Small Business Sunday