Comparison
Natural Cycles vs Premom 2026: プライバシー、機能、価格の比較
Our verdict
Natural Cycles is FDA-cleared and privacy-respecting but costs up to $149.99/yr with a thermometer. Premom has an FTC enforcement for sharing fertility data with China-based firms. One charges a premium for clinical validity; the other betrayed user trust. PinkyBloom offers AI-powered fertility tracking — no ads, never sold.
Natural Cycles vs Premom vs PinkyBloom
| Feature | Natural Cycles | Premom | PinkyBloom |
|---|---|---|---|
| Price | ~$149.99/yr | Free + ~$49.99/yr premium | Free |
| Data storage | Cloud-based | Cloud (Easy Healthcare servers) | Stored on your phone |
| FDA cleared | Yes (Class II) | ||
| Privacy track record | No major incidents | FTC enforcement action | Never sold, no ads; partner sharing end-to-end encrypted |
| OPK test strip reader | |||
| Hardware required | BBT thermometer or Oura Ring | Optional BBT thermometer | None |
| AI assistant | Built-in AI assistant (Pinky) | ||
| Voice logging | |||
| Mood forecasts | |||
| Account required | Account required | Account required | No account needed |
| Ads | No ads | Ads in free tier | No ads ever |
| Doctor visit reports |
Overview
Natural CyclesとPremomはどちらも生殖意識のある市場にサービスを提供していますが、立場は正反対です。Natural Cyclesはプレミアムな選択肢であり、FDAに承認され、臨床的に検証されており、デジタル避妊具として位置付けられています。Premomは予算に優しい選択肢であり、OPKストリップ読み取りが無料で、TTCコミュニティで人気があります。
Natural Cyclesは、日々の基礎体温を使用して、臨床的な精度で生殖日と非生殖日を分類します。Premomは、OPKストリップの写真を使用して排卵のピークを特定します。どちらも自分の生殖を積極的に管理しているユーザーのためのツールですが、方法論、コスト、信頼レベルは大きく異なります。
Natural Cyclesの実績はクリーンです：プライバシースキャンダルはなく、FDAの監視、査読付きの研究があります。Premomの実績には、中国の企業と生殖データを共有したことでFTCの執行措置が含まれています。これらの2つの間で選択するユーザーにとって、信頼のギャップは巨大です。
Privacy comparison
Natural Cycles has maintained a clean privacy record. No FTC actions, no documented data sharing, no breaches. As an FDA-regulated device, it has regulatory obligations around data integrity and security. The trade-off is that FDA regulations require data retention — you can't fully delete your information.
Premom's privacy record is one of the worst in the fertility app space. The FTC charged Easy Healthcare with sharing ovulation test results and fertility data with Google, AppsFlyer, Umeng (Alibaba), and Jiguang (Aurora Mobile) in China. All without user consent. The DOJ filed the enforcement order banning health data sharing for advertising.
The contrast is stark: Natural Cycles respects user privacy within its cloud framework; Premom was caught sending fertility data to advertising firms on two continents.
But both store data in the cloud. Even Natural Cycles' clean record doesn't change the architectural reality that your BBT readings, fertility status, and sexual activity exist on servers you don't control. PinkyBloom stores your cycle log on your phone, not in an account on our servers.
Features and intelligence
Natural Cycles excels at temperature-based fertility classification. The algorithm is FDA-cleared, peer-reviewed, and integrates with Oura Ring. For users who want clinical precision, it's the gold standard.
Premom excels at OPK strip reading — photograph a test strip and get an AI interpretation. For TTC users who want to confirm ovulation, it's a practical tool. Beyond OPK reading, features are basic.
Neither offers conversational AI, voice logging, or mood forecasting.
PinkyBloom offers AI-powered fertility tracking with voice logging, mood forecasts, and doctor visit reports. No OPK photography, but saying "positive OPK today" captures the result instantly. No thermometer required, but Apple Health integration captures BBT from compatible devices. More comprehensive than either specialized app.
Pricing comparison
コストの違いは劇的です。Natural Cycles: 年間最大$149.99にハードウェア（温度計によって$15-$299+）が追加されます。Premom: 広告付きで無料、または年間約$49.99のプレミアム。3年間で: Natural Cyclesは約$450-$750、Premomは約$0-$150です。
Natural Cyclesのプレミアム価格はFDAの承認と臨床的検証を購入します。Premomの低価格はFTCの同意命令と、中国の企業とのデータ共有の文書化された履歴を伴います。より良い代替案が存在する場合、どちらもお得な取引とは言えません。
PinkyBloom: 無料。ハードウェアなし、広告なし。両方のアプリよりも多くのAI機能。3年間のコスト: $0.
There's a better option
Natural Cycles charges $150/yr for FDA-cleared tracking. Premom has an FTC enforcement for sharing data with China-based firms. PinkyBloom offers AI-powered fertility intelligence — no thermometer, never sold. Voice logging, mood forecasts, and doctor visit reports included.
