Plants rarely tell you what's wrong. Their history does.
Sabz is a plant care app for iPhone with a plant doctor built in. When something looks off, a Check-up reads the care history you've already recorded — watering, light, repotting, the move to a colder room — and works out the likely cause with you.
iPhone · iOS 18 or later · No account needed
Most likely overwatering, beginning about three weeks ago
Moderate confidence. The watering pattern and the yellowing fit, but root rot can't be confirmed from a photo.
No water for at least two weeks — check the top 5cm before the next one.
It looks for the cause, not the symptom
Yellow leaves have a dozen explanations. Sabz narrows them down using what actually happened to this plant — how often you watered, when the light changed, how long since it was repotted — and tells you which explanation the history supports.
Your observations count
You're standing in front of the plant; Sabz isn't. Describe what you see in your own words — "the soil smells sour", "only the lower leaves" — and watch the diagnosis change to account for it.
Honest, rather than confident
When the evidence is thin, Sabz says so, names what it would need to be surer, and gives you the safest next step in the meantime. It would rather be useful than sound certain.
"Two weeks of history isn't much to go on. This could be transplant stress or a draught from the window. Move it away from the glass, log what happens for a week, and run another Check-up."
Private by design
No account, no sign-in, no analytics. Your plants, photos, care history and diagnoses live on your own devices, synced through your private iCloud so they survive a lost phone — and Sabz still can't see any of it. Photos leave only to be read — to identify a species, or as part of a Check-up — and are discarded straight after.
Read the privacy policyPet safety you can check
Toxicity for 264 species, checked against the ASPCA's published lists — cats and dogs judged separately, because for some plants they differ. Where no database lists a plant, Sabz says so rather than staying quiet. Each says what happens if it's eaten, in the ASPCA's own words, with the source shown. A general guide, not veterinary advice — in an emergency, call a vet. The full list, cats and dogs → Look a plant up →
Calm reminders
Watering reminders that adapt to the plant and the season — when the heating goes on, Sabz offers to stretch the watering and pause the feeding, one tap, undone the same way. No streaks, no badges, nothing to keep alive but the plant.
Plant problems, explained
All guides →- Cats and dogs Which houseplants are toxic to cats? All 264 species, checked against the ASPCA. The dangerous, the mild, and the safe.
- Root rot Does my houseplant have root rot? The signs, whether it can recover, and the treatment step by step.
- Autumn What changes when the heating goes on Less light, drier air, the same watering as July. What to change and what to stop.
- Dying plant Is my plant dying, or just sulking? Two checks for life, what actually kills houseplants, and the rescue in order.
Start with one plant you're worried about.