iOS · Android · Web · Predictive Watering
Lawn Logic
A smart watering app that turns live weather data and soil science into one daily answer — water for this long, or skip today — with an AI groundskeeper on hand when you want the reasoning.
The problem
Most homeowners water on a guess: too often, too little, or at the wrong time entirely. Water gets wasted, lawns stress out anyway, and nobody knows what "enough" actually means for their grass, their soil, and this week's weather.
The solution
Lawn Logic replaces the guesswork with a live moisture-deficit model. It pulls rainfall, temperature, humidity, and wind for your exact location, computes daily evapotranspiration for your grass and soil type, and leads with a single soil-moisture reading: one number, one word, and the plain-language reason behind it. Underneath sits the detail — a 14-day moisture trend, the forecast, and every figure feeding the model. Sage, an AI groundskeeper built on Claude, answers questions against your household's live lawn data rather than generic advice, and can act on what you tell it: say you're away until the 28th or that a storm missed you, and it proposes the change with a before-and-after card for you to confirm. Around that: separate watering zones for front and back, dormancy detection that stops recommending water when the grass goes to sleep for winter, two-tap rain correction when the forecast got it wrong, vacation mode, municipal odd/even watering restrictions, an iOS home-screen widget, tracking of the gallons and dollars you didn't spend, and household sharing so the whole family sees the same plan. Evening push reminders arrive whether or not the app is open. Supports Fescue, Bermuda, Zoysia, Kentucky Bluegrass, and St. Augustine.
The outcome
Live on the App Store with a 5.0 rating, on Google Play, and in the browser. Free to use, with an optional Pro subscription for multi-model forecasting and Sage. Since April 2026 it has tracked 62,334 gallons of water saved against a fixed timer, roughly $176 back in users' pockets — healthier lawns on measurably less water.
Under the hood
- Flutter — iOS, Android & web
- Claude via the Anthropic API
- FAO-56 evapotranspiration model
- Open-Meteo & Apple WeatherKit
- Firebase — auth, Firestore & functions
- In-app subscriptions
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