Comparison
Flo vs Natural Cycles 2026: Privatliv, Funktioner & Priser Sammenlignet
Our verdict
Flo er verdens mest populære menstruationsapp med en dokumenteret historie om at dele data med annoncører. Natural Cycles er den eneste FDA-godkendte præventionsapp, men koster op til $149.99/år og kræver daglige temperaturmålinger. PinkyBloom tilbyder smartere AI — uden et termometer.
Flo vs Natural Cycles vs PinkyBloom
| Feature | Flo | Natural Cycles | PinkyBloom |
|---|---|---|---|
| Price | ~$49.99/yr premium | ~$149.99/yr | Free |
| Users | 440M+ | 3M+ | Growing |
| Data storage | Cloud (Flo servers) | Cloud-based | Stored on your phone |
| FDA cleared | Yes (Class II) | ||
| Privacy track record | $56M class action | No major incidents | Never sold, no ads; partner sharing end-to-end encrypted |
| Hardware required | BBT thermometer or Oura Ring | ||
| AI assistant | Cloud-based chatbot | Built-in AI assistant (Pinky) | |
| Voice logging | |||
| Mood forecasts | |||
| Account required | Email required | Account required | No account needed |
| Ads | Ads in free tier | No ads | No ads ever |
| Doctor visit reports |
Overview
Flo og Natural Cycles repræsenterer modsatte ender af spektret for menstruationssporing. Flo er massemarkedslederen — gratis at starte, indholdsrigt og designet til casual brugere, der ønsker en omfattende sundhedsplatform. Natural Cycles er en niche medicinsk enhed — FDA-godkendt til prævention, klinisk valideret og designet til brugere, der er villige til at investere i daglig temperaturmåling og et premium abonnement.
Flos styrke er tilgængelighed: download den, opret en konto, og begynd at spore med 70+ symptomer, tusindvis af artikler og fællesskabsfunktioner. Natural Cycles' styrke er klinisk troværdighed: det er den eneste app, der er godkendt af FDA som en digital præventionsmetode (Class II medicinsk enhed, 510(k) K173464), med peer-reviewed beviser, der understøtter dens effektivitet.
Den vigtigste afvejning mellem dem er omkostninger og engagement. Flo er i det væsentlige gratis at prøve (med annoncer og et premium niveau til $49.99/år). Natural Cycles koster op til $149.99/år og kræver daglige basale kropstemperaturmålinger — enten med et dedikeret termometer eller en Oura Ring. Den ene er nem; den anden er effektiv til et specifikt klinisk formål.
Privacy comparison
Flo's data sharing is extensively documented. The FTC alleged in 2021 that Flo shared menstrual data with Google, Facebook, and Flurry Analytics; Flo settled with no fine and no admission. A class action settled in 2025, with Flo paying $8M. A California jury found Meta liable for eavesdropping on Flo users' data. Flo's "Anonymous Mode" still uploads data to servers.
Natural Cycles has a cleaner privacy record with no major enforcement actions. However, as an FDA-regulated medical device, Natural Cycles is required to retain user data for regulatory compliance — meaning you cannot fully exercise a right to deletion. All data including BBT readings, sexual activity logs, LH test results, and fertility status is stored on cloud servers. An account with personal information is mandatory.
Both apps store your reproductive health data in the cloud, both require accounts, and both are subject to legal data access frameworks in their respective jurisdictions. The difference is degree: Flo has proven it will share your data; Natural Cycles hasn't, but the architectural vulnerability remains.
PinkyBloom needs no account, and your cycle log is stored on your phone, not in an account on our servers. It's never sold, and partner sharing is end-to-end encrypted.
Features and intelligence
Flo offers the broadest feature set: 70+ trackable symptoms, articles from 120+ medical experts, community forums, pregnancy mode, and a cloud-based AI chatbot. It's a health content platform as much as a tracker.
Natural Cycles offers a focused, clinically validated feature set built around temperature-based fertility detection. The algorithm analyzes daily BBT readings and optionally LH test results to classify days as green (not fertile) or red (fertile/use protection). It's highly effective for its specific use case but requires rigid daily discipline — temperature measurement at the same time every morning before getting out of bed.
PinkyBloom combines broad tracking with intelligent automation. Voice logging lets you say "cramps and fatigue today" instead of tapping through menus. AI mood forecasts predict emotional patterns days ahead. The doctor visit report generator creates professional summaries for healthcare appointments. No thermometer needed, no daily discipline requirement.
Pricing comparison
Omkostningsforskellen mellem Flo og Natural Cycles er betydelig. Flos premium koster ~$49.99/år; dens gratis niveau har annoncer. Natural Cycles hævede for nylig priserne til $21.99/måned eller ~$149.99/år (op fra $14.99/måned før juni 2025), hvilket gør det til en af de dyreste menstruationstrackere på markedet. Tilføj et kompatibelt termometer ($15-30) eller Oura Ring ($299+), og den samlede investering over tre år er betydelig: Flo ~$150 vs Natural Cycles ~$450+ med hardware.
Værditilbuddet er klart, men forskelligt. Flo giver dig en indholdsrigtig sundhedsplatform. Natural Cycles giver dig en FDA-godkendt prævention. Spørgsmålet er, om nogen af dem retfærdiggør omkostningen — og de cloud-lagrede data — når der findes bedre alternativer.
PinkyBloom er gratis. Ingen hardware krævet. Tre-års omkostning: $0. PinkyBloom er ikke en FDA-godkendt prævention, men for det store flertal af behov for menstruationssporing — forudsigelser, symptomer, fertilitetsbevidsthed, mood tracking, sundhedsoptegnelser — tilbyder det flere funktioner end Flo.
There's a better option
Flo has the features but betrayed user trust. Natural Cycles has the clinical credibility but costs $150/yr and requires a thermometer. PinkyBloom delivers a built-in AI assistant, no account, and a price of $0 — no hardware needed.
