Splash vs Euki
Euki is a free, open-source sexual and reproductive health app run by a non-profit, with data stored on your device. Here is a side-by-side look at both, from each app’s own pages.
In short: Euki and Splash are both free and keep data on your device. Euki is open source, run by a non-profit, and was Mozilla’s top-scored period tracker in July 2026, with no sync between devices. Splash adds optional end-to-end encrypted sync, partner sharing and a doctor report, but is not open source. Reviewed 28 October 2026.
Last reviewed against Euki’s own pages · 4 sources · what changed
Euki is one of the most private trackers available, and it is open source. Splash shares the local-first approach and adds optional encrypted sync, partner sharing and a doctor report.
- Splash
- Free, with no paid tier
- Euki
- Free, funded by donations
Choose Splash if
- You want optional encrypted sync between devices
- You want to share with a partner
- You want a doctor report and a larger library
Choose Euki if
- You want open-source code you can audit
- You want reproductive-rights resources, including in Spanish
- You want to schedule automatic deletion of your data
Try it beside Euki. Splash opens in your browser with no sign-up, and you can import your history and keep both while you decide.
Get Splash, freeSide by side
| Feature | Splash | Euki |
|---|---|---|
| PriceSource [1] | Free | Free |
| Data stored on your deviceSource [2] | Yes | Yes |
| Account neededSource [2] | No | No |
| PIN and decoy screenSource [2] | Yes | Yes |
| Optional encrypted syncSource [2] | Yes | No |
| Partner sharingNot verified for Euki | Yes | – |
Where Euki is stronger
- Open source, run by an independent non-profit.[1]
- Mozilla gave Euki its top privacy rating in 2022, and described it as “squeaky clean” in its July 2026 review of six period trackers, scoring it 10 out of 10.[2][3][4]
- Reproductive-rights resources, in English and Spanish, and scheduled auto-delete.[1][2]
Questions people ask about Splash and Euki
Is Euki or Splash more private?
Both keep data on your device with no account. Euki is open source, which lets anyone audit it, and Mozilla scored it 10 out of 10 in July 2026. Splash adds optional end-to-end encrypted sync and sharing, and publishes what its server can see. If you never want any server involved, Euki is the simplest choice.
Does Euki sync between devices?
According to Mozilla’s review, Euki stores everything on your device and has no sync, so data does not follow you to a new phone. Splash offers optional end-to-end encrypted sync, a recovery code and a backup file, so you can move to a new phone without losing your history.
Can I use both Euki and Splash?
Yes. They are free, so you can try both. Splash can import spreadsheet exports, and you can keep logging in whichever feels better. Use the one that fits how you live: Euki for a minimal, open-source tracker, Splash for sync, sharing and a doctor report.
What changed at the last review
- : Added Mozilla’s July 2026 review, in which Euki was the top-scored tracker.
Sources
- Euki (official site) accessed 2026-10-26
- Mozilla Privacy Not Included: Euki accessed 2026-10-26
- TechCrunch: Period tracker Stardust shares users’ health data with analytics firm, says Mozilla research (16 Jul 2026) accessed 2026-10-28
- DH Insights: Mozilla report reveals wide privacy gaps among popular period tracking apps (30 Jul 2026) accessed 2026-10-28
Splash facts come from the app itself: local-first storage, optional AES-GCM-256 end-to-end encrypted sync, and imports from Flo, Clue, Apple Health and drip exports.
More comparisons
Try Splash alongside what you use now
Free, no account. Import your history and keep both until you decide.
