Comparison
Flo vs Stardust 2026: 개인 정보 보호, 기능 및 가격 비교
Our verdict
Flo was caught sharing data with Google and Meta. Stardust marketed privacy after Roe v. Wade but was found by Privacy International to send data to servers and use third-party de-identification. Neither delivers the privacy it promises. PinkyBloom needs no account, has no ads, and never sells your data.
Flo vs Stardust vs PinkyBloom
| Feature | Flo | Stardust | PinkyBloom |
|---|---|---|---|
| Price | ~$49.99/yr premium | Free | Free |
| Users | 440M+ | Millions (post-Dobbs surge) | Growing |
| Data storage | Cloud (Flo servers) | Cloud (de-identified via Rownd) | Stored on your phone |
| Privacy track record | Class action settled 2025; Flo paid $8M | Voluntary law enforcement cooperation | Never sold, no ads; partner sharing end-to-end encrypted |
| AI assistant | Cloud-based chatbot | Built-in AI assistant (Pinky) | |
| Voice logging | |||
| Mood forecasts | |||
| Astrology features | Astrology-themed insights | ||
| Account required | Email required | Google account required | No account needed |
| Safety Mode | Anonymous Mode (still cloud) | ||
| Doctor visit reports | |||
| Ads | Ads in free tier | No ads | No ads ever |
Overview
Flo와 Stardust는 브랜드 포지셔닝에서 주기 추적기 스펙트럼의 반대편에 위치하고 있습니다. Flo는 확립된 시장 리더로 — 4억 4천만 사용자, 포괄적인 기능, 그리고 기업 건강 플랫폼 접근 방식을 가지고 있습니다. Stardust는 Dobbs 이후 개인 정보 보호를 주장하는 도전자로 — 더 작은 앱으로, 대법원의 결정 이후 개인 정보 보호를 최우선으로 하는 주기 추적기로 마케팅하여 다운로드 수가 급증했습니다.
Flo는 깊이를 제공합니다: AI 챗봇, 70개 이상의 증상, 커뮤니티 포럼, 임신 모드, 그리고 120명 이상의 의료 전문가의 콘텐츠. Stardust는 차별화를 제공합니다: 점성술과 혼합된 주기 통찰력과 사용자들이 갑자기 생리 데이터에 대해 걱정하게 된 것에 공감하는 개인 정보 보호 메시지.
아이러니하게도 두 앱 모두 개인 정보 보호를 제공하지 않습니다. Stardust의 개인 정보 보호 주장은 독립적인 조사를 통과하지 못했습니다. 생식 데이터 개인 정보 보호를 중요시하는 사용자에게 — 특히 Dobbs 이후의 환경에서 — 두 앱 모두 아키텍처적 보호를 제공하지 않습니다.
Privacy comparison
The privacy comparison between Flo and Stardust is a case study in two different kinds of failure.
Flo's data sharing is documented in an FTC complaint and a federal class action. Menstrual data went to Google, Meta, and analytics firms. Flo paid $8M to settle in 2025, admitting nothing. A California jury found Meta liable for eavesdropping. Flo did the thing everyone fears a period tracker will do.
Stardust positioned itself as the antidote to Flo's failures. After the Dobbs decision, it marketed privacy and surged in downloads. But in June 2022, Vice/Motherboard discovered Stardust's privacy policy stated it would cooperate with law enforcement "whether or not legally required" — meaning voluntary handover of menstrual data to police. Stardust changed the wording only after press inquiry.
Then in May 2025, Privacy International revealed deeper issues: Stardust sends data to servers and relies on Rownd, a third-party de-identification service. A Google account is required, linking your menstrual data to Google's identity ecosystem. De-identification is a process, not a guarantee — academic research shows menstrual data can be re-identified with few data points.
PinkyBloom needs no account and never sells your data. Your cycle log is stored on your phone, with no third-party de-identification services. Safety Mode swaps neutral data into what she shares with a partner.
Features and intelligence
Flo's feature set dwarfs Stardust's. AI chatbot, 70+ symptoms, community forums, pregnancy mode, and thousands of articles. Flo is a comprehensive health platform.
Stardust's main differentiator is astrology-themed cycle insights — connecting your cycle to astrological concepts. The tracking itself is basic: cycle predictions and symptom logging. For users who enjoy the astrology angle, it's engaging. For users who want health intelligence, it's limited.
PinkyBloom provides genuine AI intelligence. Pinky, the built-in AI assistant, handles health conversations, voice logging captures symptoms naturally, mood forecasts predict emotional patterns, and doctor visit reports create professional summaries. It's the substance that both Flo's chatbot and Stardust's astrology insights point toward.
Pricing comparison
Flo charges ~$49.99/year for premium; its free tier has ads. Stardust is free with no ads.
Both apps store data in the cloud. Flo monetizes through subscriptions and (historically) advertising partnerships. Stardust's monetization model is less clear, but the Google account requirement and server-side data processing suggest data plays a role.
PinkyBloom is free. No ads, no Google account linkage. The total cost is $0.
There's a better option
Flo betrayed user trust with documented data sharing. Stardust promised privacy but relies on servers and third-party de-identification. PinkyBloom has no accounts to identify you, no ads, and never sells your data. Safety Mode replaces her shared status with neutral data, which neither app offers.
