Small tools that fix real problems.
TwinStack makes simple, focused utilities for your phone. Each app does one job well, opens fast, and works the same whether you carry an iPhone or an Android.
Useful beats impressive.
We start from an everyday annoyance and build the smallest tool that makes it go away. No bloat, no learning curve.
Real problems first
Every app begins with a problem people actually have, not a feature list. If it doesn’t save you time or hassle, we don’t ship it.
Easy from the first tap
Clear screens, plain language, sensible defaults. You should know what to do the moment the app opens.
Both platforms, equally
iOS and Android get the same care and the same features, so the tool works for your whole household or team.
Private by design.
Our apps collect only what they need to work, and nothing to sell. Install them without worrying about who’s watching.
No sign-up
No email, phone number or password to hand over. Open the app and start; your account is a random ID that isn’t tied to who you are.
No ads, no tracking
No advertising, no analytics and no tracking across other apps or websites. We don’t sell your data, and we never will.
Only your household can see it
Lists and chores are shared only with the people you invite. Data is encrypted on its way to our servers and while stored, and access rules let only household members read it.
Delete it anytime
One tap in the app deletes your data from our servers. When the last person leaves a household, everything in it is deleted automatically.
Read exactly what’s stored and why in the Household List privacy policy, or see how to delete your data.
One job each, done well.
Household List
The shared grocery list and chore rotation for households, on iPhone and Android, that just syncs. No sign-up, no ads, no tracking.
Coming soon
Our next app is in the works: another small, focused tool for an everyday problem.
What should we build next?
Tell us about a small, everyday problem your phone should be solving. The best ideas become our next app.
Share an ideaFrom annoyance to app.
Find the friction
We look for the small, repeated hassles people put up with every day and ask why no simple tool exists for them.
Build the simplest fix
We design the fewest screens that solve it, then build for iOS and Android side by side.
Listen and refine
We ship, listen to what people tell us and keep improving, without tracking how anyone uses the app.
Got a problem your phone should solve?
We’d love to hear it. Send us a note and we’ll get back to you.