Thirstday

The right day to water, the right window to grow.

Reminders that move when you water late, learn each plant's rhythm, and a light check for every window.

Get it on Google Play
The Light screen reading 6,380 lux at an east window, medium light, with the plants that suit it

Mark the day you really watered.

  1. Watered yesterday instead of today?Pick the real day and the next one counts from it.
  2. Soil still damp?Push the pot back two days without logging a watering.
  3. Three waterings in, it learns.The middle gap of your last five becomes that plant's own interval, shown in plain words.
  4. One digest a day.Around the time you choose, naming what is due. A Today list and a home screen widget show the same.
The Today list with one plant a day late, three due today and two due tomorrow
A Monstera watered every 9 days, learned from its last 5 waterings

Hold the phone at the glass.

The light sensor reads the window in lux or foot-candles and places it on a ruler from 100 to 100,000 lux, then names the plants from your list and from about 230 houseplants that suit the spot. Every figure is an estimate from a phone sensor, not a lab meter.

6,380lux, medium light

Low

Under 2,700 lux. ZZ plant, prayer plant, peace lily.

Medium

2,700 to 10,800 lux. Calathea, Marble Queen, monstera.

Bright indirect

10,800 to 21,500 lux. String of pearls, alocasia.

Direct

Above 21,500 lux. Aloe vera, jade, cacti.

Free to use. One purchase unlocks the rest.

Free on Google Play, unlock everything once for USD 2.99. No ads, no subscription, no account.

Free, with no limit on plants

  • Unlimited plants with a cover photo each
  • Watering and feeding, fixed or learned
  • The daily digest, the Today list and the widget
  • The live window light check
  • A backup file you can restore on any phone

The unlock adds

  • A day light log with a DLI estimate
  • Saved spots by room and a wrong-light check
  • A grow-light hours calculator
  • Misting, repotting, pruning, rotating and your own tasks
  • A photo timeline for each plant
  • Vacation mode with a sitter sheet PDF
  • CSV export

Buying or restoring goes through Google Play and needs a connection once. The unlock belongs to the Google account that bought it.

A saved east window spot at 6,215 lux with its plants and a day log, part of the unlock
Vacation mode in dark theme, part of the unlock

Works fully offline. Nothing leaves the phone.

No internet permission

The app cannot send anything anywhere. There are no ads, no analytics and no crash reporting.

Your data stays yours

Plants, photos and readings live on your phone. Save a backup file wherever you like, or export CSV with the unlock.

Honest about the sensor

Phone light sensors vary, so readings are estimates. Thirstday does not identify plants or give toxicity advice.

Reminders around your time

Android delivers the digest around the time you pick, not to the minute. The Today list is always there.