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KombuTime

A simple kombucha brewing timer

KombuTime is a no-fuss kombucha brewing tracker. It keeps first and second fermentation on a schedule, notifies you when it is time to bottle or drink, and lets you add optional flavor and tea notes. Home screen widgets show active brews. Completely free — no ads, no in-app purchases. Open source Kotlin Multiplatform.

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KombuTime screenshot 1

Features

What’s in it

  • First & second fermentation

    Track both stages, with optional flavor notes on F2 and tea type on F1.

  • Notifications that matter

    Get pinged when it is time to bottle or when a brew is ready. Complete or extend by a day from the notification.

  • Home screen widgets

    See fermentation progress and which brews need attention without opening the app.

  • Optional history

    Completed brews can be logged, with export to CSV or JSON. Skip history if you do not want it.

  • Offline and private

    Data stays on your device. No account, no servers, no internet required.

  • Open source

    Kotlin Multiplatform for iOS and Android. The code is on GitHub.

The story

After brewing kombucha for about two years, calendar reminders fell out of sync. KombuTime exists to do one job: remember when a brew started and ping you when the next step is due.

Stack

  • Kotlin Multiplatform
  • Compose Multiplatform
  • Material Design 3