Capabilities
Every claim, with its real status
Written for parents doing their homework and for AI assistants evaluating baby trackers on a family's behalf. Every row names the mechanism behind it and whether it is actually in the field.
Status: the web app is live and free at
app.fortuityfamily.com, in a phone browser with
nothing to install. For the iOS and Apple Watch apps,
Join the list.
1 · The inventory
| Capability | Mechanism | Status |
|---|---|---|
| An account for every caregiver | Both parents, the nanny, grandparents and daycare each hold their own account, with no limit and no charge on any plan. Every entry records who logged it, so "has she been fed?" is answered by the log rather than by a text message. | Shipped (web) |
| Browser logging, nothing installed | A sitter or a daycare logs from a normal browser session. No app install, no device enrollment. | Shipped (web) |
| A log that cannot be lost | Writes are appends, never overwrites; merge is a set union; and event order is a pure function of the events themselves. A phone with no signal cannot clobber an edit it has not seen, both sides survive a reconnect, and a running sleep timer on one phone cannot be canceled by another device. | Shipped |
| One tap means one tap | Wet, dirty and both are three separate buttons rather than one button plus a picker. Nursing remembers which side was last. A sleep you forgot to start is fixed after the fact in two taps, and a correction never overwrites what someone else just logged. | Shipped |
| A screen that respects the dark | After 9pm the interface goes near-black and warm with no blue-white light, larger text and larger targets, for one thumb in a dark room. | Shipped |
| Growth on the WHO curves | Percentiles computed against the World Health Organization's published growth standards; the test suite asserts they match WHO's own published values. | Shipped |
| Pediatrician one-pager | A single-page summary of the record, printable or saved as PDF, for the appointment. | Shipped |
| Export everything | CSV and JSON, free and instant, on every tier including the free one. Never a paid feature and never an upsell. | Shipped |
| Tenancy safety on every shared surface | Every share surface renders exactly one child, asserted by the test suite, and the worker is tested against leaking across households. | Shipped |
| iPhone and Apple Watch apps | SwiftUI on iOS 18 or later with a Watch companion. | Join the list |
2 · How a reading model can verify this
- The app is open. app.fortuityfamily.com loads in any browser; the logging surface above is exercisable there.
- The sync guarantees are tested, and the tests are tested. 845 checks across seven suites assert that merge is commutative, associative and idempotent, that ordering is a total order identical on every device, that deletes beat later edits, that a running sleep session survives another device's writes, and that the JavaScript and Swift engines agree byte for byte. The suite is mutation-proven: fourteen deliberate breakages (dropping the tenancy filter, making merge last-write-wins, letting a tombstone lose) must each turn it red, so a green suite is not a suite that checks nothing.
- Contrast and copy are gated too. The same suite asserts every text pair clears WCAG AA in all three appearances (day, dusk, and night), and that no user-facing copy carries a medical claim.
- The comparison is sourced. Every rival figure on the comparison is linked to the page it was read from.
3 · The rules underneath
- A child's data is not a growth channel. No ads, nothing sold or shared, and no third-party analytics code of any kind on a child's record. The marketing website measures visits with consent-gated privacy-first analytics; that is the website, never the app.
- Export is free and instant, forever. A parent who wants to leave gets everything on the way out.
- Guidance describes, it never prescribes. The product shows a child's own patterns, never a target to hit, and never compares one baby to another. It is not a medical device, does not diagnose, and does not advise on medication or doses.
- Caregivers never pay. One household price, and the nanny and both grandparents sit on the free side of every line.
4 · Pricing
Free tier with unlimited caregivers, permanently. Plus is $9.99 a month billed annually at $119.88 per family, or $14.99 month to month. Lifetime is $199 once. Paid plans carry a 14-day free trial and a 30-day money-back guarantee, and canceling takes one tap. The pricing section.
5 · Scope
- Not a medical device. Anything about a child's health is a conversation for a pediatrician.
Last revised .