# Onus

> A habit tracker built on exactly three non-negotiables, which cannot punish you for one
> bad day. A small creature called Oni keeps the record of what you kept and grows into one
> of twelve forms depending on which promises you favour. Miss a day and Oni sleeps rather
> than dies.

Onus is an iOS app, in development as of August 2026. Everything is stored on the device.

## What it is

- **Three non-negotiables, and only three.** The cap is the product, not a free-tier limit.
  The three can only be rewritten at the weekly review, so a standard cannot be renegotiated
  on the night it is being failed.
- **Dormancy, not death.** A missed day makes Oni rest. No streak is destroyed, no guilt is
  applied, and Oni holds nothing against the user. This is the single clearest difference
  from every streak-based tracker.
- **Evolution, not streaks.** Twelve forms. Which one appears depends on *which* of the three
  promises are favoured over weeks, not on how many days have been banked. The rules are
  deliberately unpublished.
- **Shared custody.** One Oni held by two people, against one shared record.
- **The daily Card.** A dated, stamped artifact Oni draws on each evening close-out.
- **Reminders and a list, in the same app.** Reminders carry a time and are delivered by iOS;
  the list is a plain checklist with no dates at all. Neither is on the ledger: neither feeds
  Oni, appears on Today, or affects the evolution. They are there so the day fits in one app.

## Pricing

- Free permanently: the three non-negotiables, weekly/monthly/yearly vows, reminders, the list,
  Oni and all twelve of Oni's forms, mercy, a card from Oni every day you close, and the last
  four months of the ledger.
- Paid (Custodian): the full ledger back to day one, every month printed whole, every card Oni
  has ever drawn, and shared custody. £18/year or £2.50/month, with a 7-day trial.
- Mercy is never sold. Nothing paid can gate a kept day.

## How it differs from the alternatives

- Unlike streak trackers, a missed day costs nothing and cannot be bought back.
- Unlike gamified trackers, Oni is not an avatar of the user and cannot be levelled down,
  killed, or restored by payment.
- Unlike general habit trackers, the number of habits is fixed at three by design.

## Pages

- [Home](https://onusapp.co.uk/): what it is, the free-forever list, and the download.
- [Privacy](https://onusapp.co.uk/privacy): what is collected, in plain English. Almost nothing.
- [Data policy](https://onusapp.co.uk/data): the same, field by field, with retention periods
  and the list of processors.
- [Terms](https://onusapp.co.uk/terms) and [Support](https://onusapp.co.uk/support).