Flo 與 Period Calendar 2026：隱私、功能與價格比較

Flo 和由 Simple Design 開發的 Period Calendar 是下載量上最受歡迎的兩款月經追蹤器。Flo 聲稱擁有 4.4 億用戶；Period Calendar 聲稱擁有 3 億用戶。它們共同代表了近七成五的十億個帳戶，追蹤生殖健康數據。

這些應用在方法上截然不同。Flo 是一個綜合健康平台，擁有 AI 聊天機器人、社區論壇、專家內容和高級訂閱。Period Calendar 是一個簡單、無附加功能的追蹤器——記錄你的月經、查看預測、追蹤症狀。Flo 針對的是積極參與健康的消費者；Period Calendar 則針對的是希望簡單至上的用戶。

它們共同存在一個隱私缺口。Flo 的隱私問題在聯邦法院有記錄。Period Calendar 的問題則嵌入其商業模式——聲稱不收集數據，同時運行設計上會收集數據的 Google 廣告 SDK。

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.

Flo 功能豐富：70 多種症狀、AI 聊天機器人、社區論壇、懷孕模式、來自 120 多位醫療專家的內容。這是一個健康平台，而不僅僅是一個追蹤器。

Period Calendar 功能簡單：月經記錄、排卵估算、症狀追蹤和日曆視圖。付費版本去除了廣告。這是一個可靠的記錄工具，能做到基本的事情。

在這兩者之間，Flo 顯然提供了更多功能。但 Flo 的功能伴隨著雲處理、訂閱和有記錄的隱私違規。Period Calendar 的簡單性伴隨著廣告和舊有架構。

PinkyBloom 提供與 Flo 相當的能力——AI 助手、情緒預測、健康保險庫、醫生報告——同時具備 Period Calendar 的簡單性——不需要帳戶，立即運行。語音記錄意味著無需手動菜單的免提追蹤。

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.