Comparison

Calu vs FastFlow

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calu

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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/

About

FastFlow

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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

Calu4 screens
FastFlow4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Calu ships an update every 11 days, FastFlow every 4 months. Both last shipped on October 30, 2026.

Scorecard1 real difference · 5 level
Calu versus FastFlow: the parameters behind the verdict, then further details
ParameterCaluFastFlow
PriceFreeFree
Update frequencyEvery 11 days — betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS18.017.0 — better
Further details — not scored
Size69 MB2 MB
Age rating4+4+
DeveloperAISMART SOLUTIONS, LIMITED LIABILITY COMPANYRenzo Ohhama

In-app purchases

3 purchases

Calu

Subscriptions3
  • Monthly Plan7 Days trial$9.991 Month
  • Limited Annual Plan$19.991 Year
  • Annual Plan7 Days trial$29.991 Year
2 purchases

FastFlow

Subscriptions2
  • FastFlow Premium - Monthly$2.991 Month
  • FastFlow Premium - Yearly7 Days trial$22.991 Year

Questions

Is Calu free?
Calu is free to download, with in-app purchases available.
Is FastFlow free?
FastFlow is free to download, with in-app purchases available.
Do Calu or FastFlow have ads?
Neither Calu nor FastFlow shows ads.
Which is updated more often, Calu or FastFlow?
Calu ships an update every 11 days, and FastFlow every 4 months. Most recently, Calu was updated on October 30, 2026 and FastFlow on October 30, 2026.

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