# Peridot Period App — Private period & cycle tracker > Simple, private period and cycle tracker with one-time purchase. (iPhone/iPad app by Filament App Studios LLC.) - Source: https://appshunter.io/ios/app/peridot-period-app/id6780071262 (this page in markdown: same URL + `.md`) - Developer: [Filament App Studios LLC](https://appshunter.io/developer/6780071264) - Category: Health & Fitness, Lifestyle - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 12+ - Requires: iOS 16.4 · 40 MB - Languages: American English - Released: 2026-09-24 - Data updated: 2026-10-14 - Monetization: paid ## What is Peridot Period App? Just a period tracker. Pay once. Yours forever. Peridot does one thing: it tracks your period and tells you when the next one is coming. No articles, no quizzes, no streaks, no subscription. Pay $9.99 once and it's yours. It isn't a fertility app, a pregnancy planner, or a wellness magazine. If you want a calm calendar, a countdown, and an honest prediction, this is it. WHAT YOU GET • A calendar that shows every logged period and the predicted next one at a glance • A countdown to your next period, front and center • One-tap logging for today, or any date you missed • Your current phase, shown as a gentle estimate • A clean history of every cycle, editable any time PREDICTIONS THAT ADMIT WHAT THEY DON'T KNOW Peridot learns your personal rhythm from the periods you log. Recent cycles count a little more so it trends with your body, and no cycle is ignored for being unusual. You get a single most-likely day plus an honest window that tightens as it learns you. Regular cycles, tight window. Irregular cycles, wider window. No false confidence. PAY ONCE. THAT'S IT. $9.99, one time. No subscription, no free trial that turns into a charge, no premium tier hiding the good parts. You buy it, you own it. YOUR DATA STAYS YOURS Everything you log lives on your device. There's no Peridot account and no Peridot server, so your data never reaches us. No analytics, no trackers, no ad networks. QUIET BY DESIGN • Notifications are off until you turn them on, and there are only two: period expected soon, and period expected today • Optional Face ID lock • Export your full history as a CSV any time. You paid once; you can walk away with your data. ONE THING, DONE BEAUTIFULLY A calendar, a dot, and a number. That's the whole app. No ads. No subscriptions. Peridot. Period. Phases are estimates derived from the cycles you log and may be inaccurate. Peridot is not a contraceptive or conception tool. ## Key features - Period and cycle tracking - Accurate prediction window - One-tap logging - Calendar view with predictions - Data privacy on device - CSV data export ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Unlock Peridot | $9.99 | one-time | ## Is Peridot Period App safe? Not enough ratings yet to assess Peridot Period App. ## Is Peridot Period App legit? Peridot Period App has limited verification signals. The AppsHunter Legitimacy Score for Peridot Period App is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about Peridot Period App ### What is Peridot Period App? Peridot Period App is a straightforward application designed solely for tracking your menstrual cycle and predicting your next period. It focuses on providing a clean calendar view, countdowns, and simple logging without additional content or features. ### How accurate are Peridot Period App's predictions? Peridot Period App learns your personal rhythm from logged periods, giving more weight to recent cycles. It provides a single most-likely prediction day along with an honest window that tightens as it learns your patterns, offering wider windows for irregular cycles. ### What is the pricing for Peridot Period App? Peridot Period App is a one-time purchase of $9.99. There are no subscriptions, free trials that convert to charges, or premium tiers hiding features. Once purchased, you own the app and its features. ### Is my data private with Peridot Period App? Yes, your data stays on your device. Peridot Period App does not create an account or use servers, meaning your logged information never reaches the developers. There are no analytics, trackers, or ad networks involved. ### Does Peridot Period App have ads? No, Peridot Period App is ad-free. The developers have stated that the app contains no advertisements, aligning with its focus on a clean and uninterrupted user experience. ### What devices does Peridot Period App support? Currently, Peridot Period App is supported on iPhone devices. The app is designed for iOS and can be accessed on compatible Apple smartphones. ### How often is Peridot Period App updated? Peridot Period App was last updated on September 24, 2026, with version 1.0. As a new release, future update frequency will depend on developer plans and user feedback. ### Can I export my data from Peridot Period App? Yes, you can export your full history as a CSV file at any time. This feature allows you to retain and manage your logged data independently of the app. ## Version history (last 1 release) ### 1.0 — 2026-09-24 No release notes. ## Apps similar to Peridot Period App | App | Rating | Price | Category | | --- | --- | --- | --- | | [Hunger.](https://appshunter.io/ios/app/hunger/id6764689575) | 5.0 (1) | Free | Health & Fitness | | [Fiore: Gym Log Workout Tracker](https://appshunter.io/ios/app/fiore-gym-log-workout-tracker/id6754960550) | 4.9 (73) | Free | Health & Fitness | | [Pro2col](https://appshunter.io/ios/app/pro2col/id6474077810) | 4.6 (55) | Free | Health & Fitness | | [Fasting Tracker 16:8 & 18:6](https://appshunter.io/ios/app/fasting-tracker-168-and-186/id6451187343) | 4.8 (44) | Free | Health & Fitness | | [FC Motivate](https://appshunter.io/ios/app/fc-motivate/id6448851857) | 3.6 (52) | Free | Health & Fitness | | [RP Hypertrophy](https://appshunter.io/ios/app/rp-hypertrophy/id1555614554) | 4.3 (236) | Free | Health & Fitness | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-14.*