A little tool. A playful idea. Something that works your way. Mytheseus helps you turn an idea into an app, then shape it with AI, one useful change at a time.
An early, self-hosted project. Creating apps is currently for invited participants.
A change, in your hands Creator workflow
✳My lists⋯
TODAY
Things to get
✓Apples
Oat milk
Coffee
+ Add an item
✎
You asked
“Could I tick things off at the store?”
✓
Ready to try
Try it on your phone. Keep it if it works for you.
Illustrative example
HOW IT WORKS
One useful change at a time.
For creators, an app is a starting point. Ask for what you need, try it on your own device, and decide what stays.
01
Describe your idea
Start a web app, for iPhone, Android and computers, or a native Android app. As you use it, ask for tweaks and new features from its Coding page.
02
Try the new version
An AI coding agent makes the change and Mytheseus builds it. A web app switches to the new version on your device; an Android app installs it as an update.
03
Choose what stays
Keep the change if it works for you, ask for another revision, or put the previous version back. People you share the app with get only the versions you keep.
WHAT IT DOES
Everything around the app.
Mytheseus builds, delivers and updates your app, and looks after the parts around it: who can use it, how they hear about changes, and what it can connect to.
Web apps on phones and computers
A web app works on iPhone, Android and computers. It opens from a link, lives at its own address, and can be added to the home screen. There is no app store step.
Native Android apps
An Android app is a real installed app, delivered as an APK rather than through an app store. It checks for its own updates and lets you know when one is ready.
Accounts and teams
Sign in with a code sent to your email; Google sign-in is being tested. The apps you make are yours. Give one to a team, and its members can change it with you.
Public apps and copies
Make an app public to list it in the gallery for anyone to use. Signed-in people can start their own copy, even as the other kind of app, unless you turn copies off.
App icon studio
Upload a picture, or describe an idea and choose from up to four AI-drawn icons. A new icon is tried and kept like any other change.
Notifications
Hear when a change is ready to try or a question needs you. People using a shared app hear about new versions. On iPhone, add the web app to the Home Screen first.
Google Calendar, being tested
Web apps will be able to read a person’s Google Calendar, read-only, once they connect it for that app, and disconnect it from the app’s settings at any time. Native Android apps can’t use it.
Activity, kept private
See how shared apps are used, counted on the Mytheseus server with no third-party scripts. Shared web apps tell people before sending launch reports, which they can stop, and explain what the server records anyway. Activity never includes what people type.
Foundations that improve
The parts every app shares, like Coding and Updates, keep getting better. Android apps take each improvement as an update you try and keep. Web apps get Coding improvements with server updates; when Coding offers a foundation upgrade, you try and keep it the same way.
Some of these depend on how a Mytheseus server is set up: emailed sign-in codes and AI icon ideas need its operator to switch them on, and so will Google sign-in and Calendar once their testing is done.
MADE WITH MYTHESEUS
Look what people can make.
Small games, creative tools, and personal ideas brought to life. Here are four real Android apps from our public collection.
1 of 4
Actual app screen
Amelia’s logo
Playful farm
Amelia's Choice
Name and care for farm animals, earn coins, and grow your collection.
Amelia was 9 and using Mytheseus for the first time. In about 30 minutes, she made her own farm app and drew its logo.Amelia’s story, shared by her family.
Prompts & build steps
Original prompt and selected later requests. Apps begin with a blank Mytheseus starter. Each time covers submission to the first test build, including retries and waiting.
First farm build
Original prompt
“make an app that you can pet cows pigs and all the other animals that are on our farm and also maintain them.”
Earn coins for new animals
“when you pet the other animals you get money and that money makes you pay for the the new animals”
Later: more farms
“I want to be able to make a new farm and have like different farms if you know what I mean.”
The extra farms were added later, beyond Amelia’s first half-hour session.
App previewSilent gameplay: flames flicker beneath a marshmallow as it moves toward the fire, turns, and is pulled away.
Campfire game
Campfire Roast
Listed as firepit in the collection
Roast marshmallows to order, flip them at the right moment, and aim for a new best score.
A simple idea became a game of timing: golden marshmallows, dancing flames, and one more try.
Prompts & build steps
Original prompt and selected later requests. Apps begin with a blank Mytheseus starter. Each time covers submission to the first test build, including retries and waiting.
First marshmallow game
Original prompt
“create a campfire game where you have to roast the marshmallow perfectly if you go to close it burns I really want a cool burning animation when you mess up have points and levels and make it a good game bro”
Then refined with two rounds of feedback.
Make it daytime
“make it daytime”
Let people choose
“go back to nighttime. but let the user select between both.”
Each version was tried before the next change was requested.
App previewSilent gameplay: a shipping container full of yellow rubber ducks shakes while the viewpoint rotates around it.
3D play space
duckies
Pour and shake objects in a 3D container, then explore how they settle.
An ambitious 3D idea, built through several revisions. Start with rubber ducks, change the container, and shake things up.
Prompts & build steps
Original prompt and selected later requests. Apps begin with a blank Mytheseus starter. Each time covers submission to the first test build, including retries and waiting.
First 3D version
Original prompt
“ok I was asked how many rubber duckies can fit in a 40 foot shipping container. I don't buy the answer they gave (and estimate based on volume). but I think they didn't think at all about packing of said duckies.... I want you to actually do it. build a 3d simulation of dumping rubber duckies into the shipping container. this should have real physics. features I want: - good quality and real physics and looks good - would be nice to choose different objects AND containers to play/test.”
Elapsed time includes two 40-minute timeouts and a nudge to resume.
Update the icon
From submitting the chosen icon to a ready test build; excludes creating or choosing the artwork.
Shake the actual phone
“I want to be able to shake it by shaking my actual phone”
Actual app screen
Creative tool
Draw a widget
Make and save drawings, then put your artwork on your Android home screen.
A little creative tool for making your phone feel like yours, from a drawing to a home-screen widget.
Prompts & build steps
Original prompt and selected later requests. Apps begin with a blank Mytheseus starter. Each time covers submission to the first test build, including retries and waiting.
Drawing + home-screen widget
Original prompt
“in the app I want to simply be able to do a simple drawing and then save it perhaps I can have you know a library or multiple of them and then the main feature is that I can add those drawings that I've created and save as widgets to my Android like home screen desktop”
Swipe to explore. Open “Prompts & build steps” for the requests, timings, and refinements behind each app.
Try a few for yourself.
Mytheseus Public is a small Android app for browsing this collection and installing examples. It lets you try what people have made; creating and editing apps requires separate creator access.
Make an app your own, then share a version others can simply enjoy. They get the versions you keep, without the creating and editing.
CREATOR EDITION
Shape your app
Ask for changes from inside the app, try them, and choose which version to keep.
USER EDITION
Share what works
People get the app and its kept updates, with no coding controls. Share it with a link, or make it public in the gallery.
HUBS
One link for a set of apps
Gather web and Android apps into a Hub with its own name and address, ready for family, friends or a team. Turning a Hub link off ends the access it gave. Android apps in a Hub use the Hub app.
ABOUT THE PROJECT
Why Mytheseus?
Like the ship of Theseus, an app can change a piece at a time while staying yours. Mytheseus is an experiment in software that adapts to real needs through small, reviewable steps.
Mytheseus is an early, self-hosted project. It makes web apps that work on iPhone, Android and computers, and native Android apps. Creation access is currently limited to invited participants. Anyone can try the shared apps in the public example collection above.
Creating apps is by invitation while Mytheseus is early. If you have been invited, sign in to make your first app. On Android, anyone can try the example apps.
Amelia’s logo
