Comparison
Flo vs Period Calendar 2026: Privacy, Functies & Prijs Vergelijken
Our verdict
Flo (440M+ users) was accused of sharing data with Google and Meta. Period Calendar (300M+ claimed users) claims no data collection while running Google Ads. The two most-downloaded period trackers both have privacy contradictions. PinkyBloom resolves the contradiction entirely — zero ads, never sold.
Flo vs Period Calendar vs PinkyBloom
| Feature | Flo | Period Calendar | PinkyBloom |
|---|---|---|---|
| Price | ~$49.99/yr premium | Free with ads + IAP | Free |
| Users | 440M+ | 300M+ claimed | Growing |
| Data storage | Cloud (Flo servers) | Claims local storage | Stored on your phone |
| Privacy track record | Class action settled 2025; Flo paid $8M | Ad SDK contradictions documented | Never sold, no ads; partner sharing end-to-end encrypted |
| AI assistant | Cloud-based chatbot | Built-in AI assistant (Pinky) | |
| Voice logging | |||
| Mood forecasts | |||
| Content library | Thousands of articles | Basic tips | AI-generated insights |
| Account required | Email required | Optional | No account needed |
| Ads | Ads in free tier | Yes (Google Ads/AdMob) | No ads ever |
| Doctor visit reports | |||
| Languages | Many | Many | 71 languages |
Overview
Flo en Period Calendar van Simple Design zijn, op basis van downloadcijfers, de twee populairste menstruatietrackers die ooit zijn gemaakt. Flo claimt 440 miljoen gebruikers; Period Calendar claimt 300 miljoen. Samen vertegenwoordigen ze bijna driekwart miljard accounts die gegevens over reproductieve gezondheid bijhouden.
De apps verschillen dramatisch in aanpak. Flo is een uitgebreide gezondheidsplatform met AI-chatbot, communityforums, deskundige inhoud en premium abonnementen. Period Calendar is een eenvoudige, no-nonsense tracker — log je menstruatie, zie voorspellingen, volg symptomen. Flo richt zich op de betrokken gezondheidsconsument; Period Calendar richt zich op de gebruiker die eenvoud boven alles wil.
Wat ze gemeen hebben, is een privacykloof. Die van Flo is gedocumenteerd in de federale rechtbank. Die van Period Calendar is ingebed in het businessmodel — het beweert geen gegevens te verzamelen terwijl het Google-advertentie-SDK's draait die gegevens verzamelen volgens ontwerp.
Privacy comparison
Flo's privacy failures are the most documented in the industry. An FTC order in 2021, a class action Flo settled for $8M in 2025, and a California jury verdict against Meta for eavesdropping on Flo users' data. Flo denies wrongdoing, and no court has found that it broke the law.
Period Calendar's privacy situation is different but concerning. The app markets itself with bold "we don't collect or store your data" claims. But it's ad-supported through Google Ads, DoubleClick, and AdMob. Privacy International documented heavy third-party network traffic to Google advertising services despite the local storage claims. Advertising SDKs collect device identifiers, usage patterns, and behavioral data by definition — that's how ad targeting works.
The pattern is the same: both apps say one thing about privacy and do another. Flo's contradiction ran for nearly three years before the press caught it. Period Calendar's contradiction is structural — you cannot simultaneously claim "no data collection" and run ad networks that require data collection to function.
PinkyBloom eliminates the contradiction. No ads means no ad SDKs. No accounts means no identity linkage. Your cycle log is stored on your phone, protected by your phone's own encrypted storage.
Features and intelligence
Flo is rijk aan functies: 70+ symptomen, AI-chatbot, communityforums, zwangerschapsmodus, inhoud van 120+ medische experts. Het is een gezondheidsplatform, niet alleen een tracker.
Period Calendar is eenvoudig in functies: menstruatielogboek, ovulatie-inschattingen, symptoomtracking en een kalenderweergave. De betaalde versie verwijdert advertenties. Het is een logtool die de basis betrouwbaar doet.
Tussen de twee biedt Flo duidelijk meer. Maar de functies van Flo komen met cloudverwerking, abonnementen en gedocumenteerde privacy-inbreuken. De eenvoud van Period Calendar komt met advertenties en legacy-architectuur.
PinkyBloom biedt mogelijkheden op het niveau van Flo — AI-assistent, gemoedstoestandvoorspellingen, gezondheidskluis, doktersrapporten — met de eenvoud van Period Calendar — geen account nodig, werkt onmiddellijk. Stemlogging betekent handsfree tracking zonder handmatige menu's.
Pricing comparison
Flo charges ~$49.99/year for premium. Period Calendar is free with ads and optional paid upgrades. The cost difference is significant — Flo is among the most expensive period trackers; Period Calendar is among the cheapest.
But the real cost includes what you pay beyond money. Flo costs subscriptions and, for nearly three years, your data. Period Calendar costs your attention (ads) and potentially your data (ad SDKs).
No ads, no hidden data costs. More features than Flo, simpler than Period Calendar, and never sold.
There's a better option
The two most-downloaded period trackers both have privacy contradictions — Flo's documented by the FTC, Period Calendar's embedded in its ad model. PinkyBloom is the zero-contradiction alternative: no ads, no account, never sold. More features than Flo, simpler setup than Period Calendar.
