You have a phone app (Expo, React Native or Capacitor)

What goes wrong for you

On a phone, people don’t email you when something breaks. They close the app, and sometimes they leave a one-star review a week later. By then you can’t tell which screen, which phone or which version it was.

What Mushi Mushi does

• Your users shake the phone, or tap a small bug button, and type one sentence. The report can include a screenshot of the screen they were on.
• No signal? The report waits on the phone and sends itself once the phone is back online.
• You get a plain-English diagnosis (what broke, how serious it is, the likely cause) and a fix prompt for Cursor, Claude Code or another AI editor.

Native iOS, Android and Flutter libraries are previews.

What you do

1. Run npx mushi-mushi in your app’s folder. It finds Expo, React Native or Capacitor, installs the right package and saves your project ID and key.
2. Make a new build of your app, so the button ships with it.
3. When a report comes in, read the diagnosis, paste the fix prompt into your AI editor, check the change and ship an update.

How long it takes

A few minutes for the setup, plus the time your app takes to build.

What it costs

Free for one app: 100 diagnoses a month, no card and no AI key of your own. More apps are on Builder and Studio.

Next

• See a sample report, no sign-up.
• Set up your phone app: Expo, React Native, Capacitor and the native previews.