Heaptender: Compost Journal

Heaptender is an offline journal for backyard composting. Create a pile, log what goes into it, and keep an eye on the balance between greens and browns.

WHAT YOU CAN LOG
• Greens (nitrogen) — kitchen scraps, coffee grounds, grass clippings, fruit peels, eggshells, tea bags, or your own custom material
• Browns (carbon) — dry leaves, cardboard, shredded paper, wood chips, straw and hay, sawdust, or custom
• Turning and aeration, with a light, moderate or intense effort level
• Moisture checks — dry, optimal or soggy, and whether you added water
• Heap temperature in °F, with your own observations

GREENS AND BROWNS BALANCE
Every feeding updates a balance bar showing the share of greens and browns in the pile. Heaptender tells you when the mix has drifted — too many greens can cause odours, too many browns and the pile stays cold — and confirms when the ratio looks healthy.

PILE OVERVIEW
Each pile gets an overview card with a harvest progress bar and a countdown to its estimated ready date, set to 90 days by default and adjustable in 30-day steps. The same card shows how long it has been since the last turn, prompts you when a pile has never been turned, and displays the last recorded moisture level and temperature.

AS MANY PILES AS YOU NEED
Track several piles at once and switch between them with a tap. Each one keeps its own activity log, newest entry first, and you can delete individual entries.

BUILT-IN GUIDANCE
Short prompts explain what you are looking for — compost should feel like a damp, wrung-out sponge, and an active heap usually runs between 110°F and 140°F.

COMPLETELY OFFLINE
No account, no sign-up, and no internet permission at all. Everything is stored in a local database on your device. No ads, no analytics, no tracking.

Light and dark themes follow your system setting. The app opens with one example pile and a few sample entries so you can see how it works; delete it whenever you like.