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Euki vs Mori
The short answer: Euki and Mori are rare exceptions in this category — both are free, need no account, and keep records on your device. Euki is a nonprofit app by Ibis Reproductive Health alumni, deliberately offline-only with no sync at all. Mori adds deterministic prediction ranges with confidence, full export, and one optional paid feature: encrypted cloud sync (US$3.99, once).
Side by side
| Euki | Mori | |
|---|---|---|
| Price | Completely free — nonprofit-funded, no in-app purchases | All core features free forever; optional encrypted sync US$3.99 once |
| Account | None | None. An email is only needed if you opt into cloud sync |
| Offline use | Fully offline by design — there is no sync | Fully functional without network; optional sync exists but is off by default |
| Where records live | On-device only, always | On-device by default; sync uploads a client-encrypted snapshot |
| Backup / migration | No sync; switching phones means starting over (delete-on-exit options for safety) | Full export (JSON / CSV / readable summary) plus optional encrypted sync for device migration |
| Predictions | Manual tracking with reference info; does not emphasize predictions | Deterministic estimates shown as date ranges with basis and confidence level |
| Extras | Extensive sexual & reproductive health info library; PIN protection; gender-inclusive framing | Discreet notifications, one-tap delete-all, storage diagnostics |
| Platforms | iOS and Android | Android today (signed APK); iOS in progress |
| Who makes it | Euki, Inc. — a 501(c)3 nonprofit spun out of Ibis Reproductive Health (2024) | Jie Cao, an independent developer |
Where they genuinely differ
Never-cloud vs optional-cloud
Euki's stance is absolute: no sync exists, so there is no decision to make and no server copy possible — the safest posture, with a real cost: your records die with the phone unless you re-enter them. Mori keeps the same local-first default but gives you an exit: export anytime, or opt into end-to-end-style encrypted sync if you want backup.
Education vs estimation
Euki doubles as a sexual and reproductive health reference library — a strength Mori doesn't try to match. Mori instead invests in prediction transparency: every estimate ships with the data basis and a confidence level, and degrades honestly when your history is thin.
Institution vs individual
Euki is maintained by a nonprofit with public-health roots — longevity and mission are its strengths. Mori is built by an independent developer; the tradeoff for a smaller operation is a focused scope (no library, no chatbot) and code that stays auditable in purpose.
Which should you choose?
- Choose Euki if you want a nonprofit-backed app with a built-in health library, on iOS or Android, and you are fine with zero backup/sync — the strictest possible privacy posture.
- Choose Mori if you want the same no-account, on-device privacy plus prediction ranges with confidence, full data export, and an optional encrypted backup path. Android only, for now.
Honest note: these two overlap more than any other pair in this series. Both are legitimate choices; the deciding factor is whether you want backup/migration options and prediction transparency (Mori) or a maximal no-cloud stance with a health library (Euki).
FAQ
Is Euki really free?
Yes. Euki is developed by the nonprofit Euki, Inc. and is completely free with no subscription and no in-app purchases — same as Mori's free core, except Mori offers one optional paid add-on: encrypted cloud sync for US$3.99 once.
Can I back up or move records with Euki?
Euki stores everything on-device and deliberately has no cloud sync — moving phones means starting over or manually re-entering. Mori also stores records on-device by default, but offers optional encrypted sync and full export (JSON, CSV, readable summary) for migration.
Which is more private, Euki or Mori?
On default settings both are strong: no account, on-device storage, no ads. Euki's edge is its nonprofit mission and track record since 2019. Mori's edge is that export, deletion and optional encrypted sync are built in, and predictions always show their basis and confidence.