lilCycles vs Euki
Euki pairs period tracking with sexual and reproductive health information, runs on iOS and Android, and lets you set an optional PIN that it states is not linked to personal information like your email address or phone number. lilCycles is Apple-only, has no in-app PIN, and adds strength training, readiness and personal records alongside the cycle while keeping app-only data local by default with no account.
At a glance
| lilCycles | Euki | |
|---|---|---|
| Platforms | iPhone, iPad, Apple Watch and Mac | iOS and Android |
| In-app PIN lock | Not available; data is protected by your device | Optional PIN not linked to personal information |
| Reproductive health information library | Not included | Yes |
| Appointments and medications | Not listed | Yes |
| Strength training, readiness, PRs and injuries | Yes | Not listed |
| Mood, energy and journal notes | Yes | Not listed beyond symptoms |
| Predictions | Estimated calendar planning in lilCycles Plus | Predictions, average cycle length and period duration |
| Account required | Not required | Not stated on the official site |
| Apple Health | Write-only authorization, user initiated | Not stated on the official site |
| Price | Free download. lilCycles Plus is $7.99 USD weekly, $24.99 USD monthly or $249.99 USD yearly as of August 2026. | Not stated on the official site. |
Every Euki entry above is taken from https://eukiapp.org/, checked in August 2026. Where that source does not state something, this table says “not stated” rather than guessing.
A note on what could not be checked
Euki's privacy page returned a 404 when this comparison was written in August 2026. Because of that, Euki's storage model, account requirement, licensing and price are recorded above as “not stated” rather than guessed. If those points decide it for you, read Euki's own site directly rather than trusting any comparison page, including this one.
Where Euki is stronger
This is the part most comparison pages leave out. Euki beats lilCycles on the following, and if any of them is your deciding factor you should pick Euki.
- Android support, which lilCycles does not have.
- Built-in sexual and reproductive health information alongside tracking.
- An optional PIN lock that Euki states is not linked to personal information like your email address or phone number. lilCycles relies on device-level protection.
- Tracks appointments and medications as first-class items.
Where lilCycles is different
- App-only data is kept local by default. There are no accounts, no ads, no analytics or tracking SDKs, and no CloudKit sync.
- Apple Health authorization is write-only and Health writes are user initiated, so lilCycles writes when you ask rather than reading your Health history.
- Strength training, readiness, personal records and injuries are logged next to the cycle, which general cycle apps do not do.
- Optional AI summaries run against an Ollama or OpenAI-compatible endpoint you configure yourself, and you review the exact payload before it is sent.
- Honest limit: there is no sync of any kind, so your history lives on one device unless you export an encrypted archive.
Not medical care. lilCycles is a wellness logging and planning tool. It is not medical care, diagnosis, treatment, contraception, fertility certification, emergency support, legal advice, clinical decision support, or safety-critical guidance.
Frequently asked questions
Does lilCycles have a PIN lock?
No. lilCycles relies on your device's own protection. Euki publishes an optional PIN that it states is not linked to personal information like your email address or phone number.
Does Euki work on Android?
Yes. Euki lists iOS and Android. lilCycles is Apple-only.
Does lilCycles include health information articles?
No. lilCycles is a logging and planning tool. Euki pairs tracking with sexual and reproductive health information.
Is Euki free?
Euki does not state a price on its official site, so none is published here.
What does lilCycles track that Euki does not list?
Strength sessions, training readiness, personal records and injuries, plus mood valence, energy and journal notes.
Is lilCycles medical care?
No. It is a wellness logging and planning tool, not medical care, diagnosis, treatment, contraception, fertility certification, emergency support, legal advice, clinical decision support, or safety-critical guidance.
Sources
Facts about Euki come from https://eukiapp.org/, read in August 2026. Facts about lilCycles come from its App Store metadata published by lilMONSTER. This page names no version numbers, because release candidates in review are not shipped software.