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No. Journal text never leaves your account. The AI features send the statistics we computed — a correlation coefficient, a sample size — and the text of the specific entry you asked for a reflection on, and nothing is retained for training. It is also excluded from our own analytics: the event recorded when you write is a word count, not the words.

A streak app rewards not breaking a chain. Crescendo measures whether the chain is doing anything. It correlates your habits against your sleep and mood, and only reports a relationship when it clears three thresholds at once: at least 20 paired days, a correlation of 0.25 or stronger, and a Bonferroni-corrected p-value of 0.00625 or lower.

It says so. The hypotheses are fixed in advance rather than searched for after the fact, so "nothing significant yet" is a real result the Insights screen is designed to show. An app that always finds a pattern is not measuring anything.

Usually not. A day counts towards a streak at 60% of its expected load rather than 100%, a habit due four days a week only contributes four sevenths of a day, and a today that is merely still in progress never breaks a run.

Yes, in one click, as JSON — every habit, completion, journal entry, sleep record and mood log, plus your consent history. No support ticket, and no waiting period.

Yes. It installs to your home screen on both iOS and Android and runs full screen like any other app, with no store download. Native apps may follow later on the same API, so your data moves with you either way.

We measure which pages and features help people, and whether our advertising reaches the right ones. That means page views, feature usage and conversions — never journal text, and never inferred health information sent to an advertising platform. You can decline all of it and the product works identically.