Health, home and travel decision
Rasa
A technical user can build a useful minimal cycle‑aware workout recommender and tracker in about a week, but recreating the full polished app (curated workout content, App Store subscription UX, Apple Health sync, translations, and polish) is larger and more work than a single developer should expect to fully replicate.
View on the App Store↗$2.99/mo
$36/yr
Read off the official pricing page.
$100one-off36 h to build
$30/mo3 h/mo upkeep
On cash alone, building overtakes the subscription at 13 seats.
Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need - the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship. All Rasa alternatives, with the arithmetic →
What a replacement has to do
- Log period dates → calculate cycle phase → surface daily phase‑matched workout recommendation → record check‑ins and streaks → persist user data and subscription status
What it still won’t have
- Curated, professionally produced workout library and polish of the App Store app
- Built-in Apple Health sync (the page lists Apple Health sync as a feature)
- App Store in‑app purchase UX and lifetime/annual billing options (offered by the app)
- Polished visuals and gamified 'garden' content and unique plant collectibles
- Platform widgets, translations, and push notification polish
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 13 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal cycle‑synced workout web + PWA using Node.js + Express backend, PostgreSQL, and React Native (or React PWA) frontend. Core features in scope: period logging, phase/day calculation, daily phase→workout recommendation engine, basic workout content list (host static video/audio on S3), user accounts with email auth, subscription flagging (Stripe) and local entitlement checks, daily check‑in and simple 'garden' streak UI, and exportable cycle history. Out of scope: curated professional video production, translations, App Store in‑app purchase integration, push widget implementation, and Apple Health sync. Require input validation, server and client error handling, automated tests for cycle calculations and recommendation logic, and deployment scripts (Docker, simple CI).
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 3 cited sources+3
- Price verified on pricing page+3
- Evidence score63
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productRasa: Your Body Knows App - App Store
- open sourcewger-project/wger
- open sourceSnouzy/workout-cool
Integrity checks
What held up, and what did not.
