Calu vs FastFlow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calu
Read full descriptionHide full description
Getting Started with Calu: Answer a few questions (like height and weight) to create your personalized custom plan. Snap a photo of your meal. You can even close the app right after. Calories, protein, carbs, and fat are automatically tracked for you. Calu helps you reach your ideal body faster and more efficiently than anyone else. We’re not like those overly complicated diet apps. With Calu, you can track your daily nutrition in under 6 seconds. Our goal is to save you time while helping you feel confident in your own body. Of course, real results also require your own effort. We’ll be here to fully support that effort—providing the right tools and insights you need. Note: This app does not provide medical advice. All suggestions are for reference only. For any health-related decisions, please consult a doctor or qualified professional. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
FastFlow
Read full descriptionHide full description
シンプルで美しい断食タイマーアプリ。 間欠的断食(インターミッテント・ファスティング)を簡単に記録・管理できます。 【主な機能】 • ワンタップで断食開始 • 16:8、18:6、20:4など人気のプランを用意 • カスタム断食時間の設定 • 進捗をリアルタイムで確認 • 履歴と統計で成果を可視化 • 断食完了時の通知 【こんな方におすすめ】 • 健康的なライフスタイルを目指す方 • ダイエットを習慣化したい方 • シンプルなアプリを好む方 【Premium機能】 • 詳細な週間・月間統計 • 無制限の履歴保存 • カスタムテーマ ※本アプリは医療アドバイスを提供するものではありません。断食を始める前に医師にご相談ください。 利用規約:https://apps.qursor-dev.com/app/6755752536/terms
Screenshots
Verdict
The clearest difference is update cadence: Calu at every 11 days against FastFlow's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Calu sells 3 in-app purchases, starting at $9.99 per month and FastFlow sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Calu ships an update every 11 days, FastFlow every 4 months. Both last shipped on October 30, 2026.
| Parameter | Calu | FastFlow |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 days — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 69 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | AISMART SOLUTIONS, LIMITED LIABILITY COMPANY | Renzo Ohhama |
In-app purchases
Calu
- Monthly Plan7 Days trial$9.991 Month
- Limited Annual Plan$19.991 Year
- Annual Plan7 Days trial$29.991 Year
FastFlow
- FastFlow Premium - Monthly$2.991 Month
- FastFlow Premium - Yearly7 Days trial$22.991 Year








