Chrome extension
Caves of Wonders
The cheekiest bookmark manager for people whose saved links have become a small civilisation.
Yellow Sparks
Useful browser tools, websites and small ideas that became much bigger than expected.
Explore Our Products About Yellow SparksThings we have built
Things we wanted to exist, so we made them.
Chrome extension
ChatGPT Conversation Booster
Bring some calm, structure and findability to long ChatGPT conversations.
Website
Smart Conversion
Fast, reliable calculators and unit converters for questions that should not take all afternoon.
A little about us
We build what we want to build
Sometimes it is a very practical tool. Sometimes it gets a mascot, a huge pile of options or more attention than any sensible person would give it. We are a studio based in England.
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