Euki vs drip: two open-source private period trackers compared
Euki vs drip compared on data storage, fertility tracking, cost, and who builds them, plus where a third option like Luna fits if you want more than local-only tracking.
Euki and drip are the two names that come up most when people want a period tracker that does not sell data. Both are open source, both keep data on your phone, and both are built by people who are not trying to monetize your cycle. They are more alike than different, but the differences matter.
Pattern Snapshot
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Euki
Free, run by a nonprofit, with sexual and reproductive health information alongside period tracking. Says it never collects personal data.
drip
Free and volunteer-run, with data stored only on your phone by default and a symptothermal method for fertility awareness.
The real difference
Euki leans toward information and simplicity. drip leans toward detailed fertility tracking using temperature and cervical signs.
Third option
Luna adds EU-hosted sync, a cycle-aware AI, and a private partner mode, in exchange for a subscription.
Details below reflect each app’s public materials and independent privacy reviews as of October 2026 and can change.
Side by side
| Euki | drip | Luna | |
|---|---|---|---|
| Where data lives | On your device; says it never collects personal data | Stored on your phone by default | EU servers (Frankfurt) |
| Open source | Yes | Yes, code on GitLab | No |
| Who builds it | An independent nonprofit | A small volunteer team | Luna Team |
| Price | Free, supported by donations | Free, optional donations | 1-month free trial, then $4.99/mo |
| Fertility method | Period and pregnancy tracking | Period only, or symptothermal method | Pattern tracking, not a contraceptive |
| Ads | None | None stated | None |
| Recovery if you lose your phone | Local only, so data may be lost | Local by default; can export a CSV | Account-based |
| Partner feature | Not a core feature | No | Privacy-filtered partner mode |
Short answer
If you want a free, open-source tracker and are happy with local-only storage, both are credible. Pick Euki if you also want sexual and reproductive health information in the same app and a simple tracker. Pick drip if you want a more detailed fertility-awareness tool built around temperature and cervical signs.
Neither is a contraceptive. If you are using any app for pregnancy prevention, talk to a healthcare professional about a regulated method.
Euki in detail
Euki is run by an independent nonprofit as an open-source project, and its site says it never collects personal data. It is free with no paywalls, supported by donations, and it pairs period and pregnancy tracking with resources on body and sexual health.
An independent Mozilla review noted that it needs no account, has no cross-device backup, and offers a PIN, automatic data deletion, and a decoy screen for situations where someone might force you to unlock your phone. The same review flagged one caveat: some external websites opened in its in-app browser loaded third-party analytics, although the health information stayed inside the app in its tests.
drip in detail
drip is built by a small team of volunteers and funded by grants and optional donations. Its site says everything you enter stays on your device, and the source code is public on GitLab.
Its distinguishing feature is the symptothermal method, which combines basal body temperature with cervical mucus or cervix observations. Its tracking can be switched to period only if you do not want the fertility side. The app can import and export CSV files, which is useful for moving data between phones.
Where they differ in practice
- Purpose. Euki mixes tracking with information. drip is a tool for people who want to chart fertility signs themselves.
- Effort. drip rewards daily observations such as temperature. Euki asks less of you.
- Backup. Both are local by default. drip’s CSV export gives you a manual route to keep a copy. Euki does not offer cross-device backup.
- Reach. Euki is available in English and Spanish. Check drip’s site for current language support.
Where Luna fits as a third option
Both apps choose to hold nothing on a server. Luna makes a different trade: data is stored in the EU (Frankfurt), the app runs no ads, never sells data, and deletion is one tap. In exchange for trusting a clearly stated EU server, you get account-based recovery, a cycle-aware assistant that reads your own logs, predictions shown as ranges, and a partner mode that never exposes your notes, temperature, or intimacy logs.
Luna is paid and not open source, so if auditable code is a hard requirement, Euki or drip is the better fit. For a direct comparison, see Luna vs Euki. For the wider field, see best private period tracking apps.
Which app is better depending on what you want
If you want free, open source, and the simplest tracker
→ Euki
If you want health information alongside tracking
→ Euki
If you want to chart temperature and cervical signs
→ drip
If you want to keep a manual copy of your data
→ drip
If you want recovery, sync, an AI assistant, or partner sharing
→ Luna
The useful takeaway
Euki and drip are both strong answers to a real question: how do I track my cycle without a company holding my data? Euki is the gentler, more informational one. drip is the more hands-on, fertility-focused one.
If neither matches how you want to use an app day to day, Luna is the option that trades local-only storage for EU-hosted features. All three can track a cycle. The right one depends on how much you want to do yourself, and how much you want the app to do for you.
Is This Normal?
Can I use an open-source period tracker for birth control?
Not on the strength of the app alone. Open source makes privacy claims easier to verify. It does not make an app a contraceptive. If preventing pregnancy is your goal, talk to a healthcare professional about a regulated method.
Fertility-awareness methods such as the symptothermal method require careful learning and consistent use, and they carry a real risk of unintended pregnancy if used imperfectly.
Frequently asked questions
Which is more private, Euki or drip?
Both keep data on your phone and are open source, and neither is built around ads. Euki’s site says it never collects personal data, and drip’s site says everything you enter stays on your device. Both are strong on privacy, so the choice usually comes down to features.
Is drip free?
drip is volunteer-run and accepts optional donations. Euki is also free, supported by donations.
Does drip track temperature?
Yes. drip supports the symptothermal method, which combines basal body temperature with cervical mucus or cervix observations. You can also use it for period tracking only.
Is Euki open source?
Yes. Euki’s site describes it as an open-source project managed by an independent nonprofit.
Can I back up Euki or drip?
Both store data locally by default. drip can import and export CSV files, which gives you a manual backup. A Mozilla review notes that Euki has no cross-device backup, so a lost phone can mean lost data.
Is Luna an alternative to Euki and drip?
If you want recovery, a cycle-aware assistant, and a private partner mode, yes. Luna stores data in the EU (Frankfurt), runs no ads, and never sells data, but it is paid and not open source.
Related reading
- Luna vs Euki
- Best private period tracking apps
- Do period apps sell your data?
- How to track your cycle without sharing your data
- Period tracker without subscription: how to find one that is genuinely free
If you want a cycle app with no ads, clear EU hosting, and guidance that stays honest about uncertainty, that is what Luna is built for. 1 month free, $4.99/month after, cancel any time.
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