FastFlow vs Pengu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastFlow
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FastFlow is a lightweight fasting tracker and fasting timer for intermittent fasting plans like 16:8, 18:6, 20:4, and OMAD. It helps you start more easily, stay consistent, and better understand your own rhythm over time. With FastFlow, you can: - choose a common fasting plan or create your own custom schedule - start a fast in one tap and clearly track your duration and goal progress - receive start reminders, phase reminders, and goal reminders - keep a complete fasting history with add, edit, and delete support - review stats and weekly reports, including completions, streaks, and time trends - log weight alongside your fasting rhythm for longer-term reflection - generate share cards for completed fasts and weekly reports FastFlow is not a calorie-counting platform or a heavy social app. It is a calmer, lighter, and more reliable companion for building a fasting rhythm you can actually keep. Important: intermittent fasting is not suitable for everyone. If you are pregnant, breastfeeding, or have a medical condition or blood sugar concern, please consult a qualified healthcare professional first. Privacy Policy: https://fasting-nu.vercel.app/privacy Terms of Use: https://www.apple.com/legal/macapps/stdeula/
Pengu
Track your intermittent fasting and meals with a gentle approach. Features include fasting timers, one-photo meal logging with auto-detection, and calorie counting. Monitor your progress with a visual mascot and calendar view.
- Intermittent fasting timers (16:8, 18:6)
- One-photo meal logging
- Calorie and nutrition tracking
- Penguin progress mascot
- Auto-detected food menus
- Calendar view of past data
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Pengu: a gentle fasting, diet, and meal tracker. Intermittent fasting timers (16:8, 18:6), one-photo meal logging, and calorie tracking — all in one app. [Key features] • Pick a plan like 16:8 or 18:6 and start the timer with one tap • A penguin mascot shifts with your fasting progress, so you can see how it's going at a glance • Snap a food photo and Pengu auto-detects the menu and nutrition • When the result looks off, edit it by hand right away • Daily totals for calories, protein, carbs, and fat • Calendar view of your past fasts and meals • Available in English, Korean, Japanese, and Chinese [Pengu Pro] Unlimited photo analysis, full history, every fasting plan, and extra insights. Cancel anytime from your subscription settings. Take it lightly, keep it going — with Pengu. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://shore-clutch-a8c.notion.site/Privacy-Policy-36cb98f789b8807fa028f82bdb713cb5
Screenshots
Verdict
The clearest difference is ads: Pengu at none against FastFlow's shown. Pengu also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, 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. FastFlow sells 2 in-app purchases, starting at $0.99 per month and Pengu sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
FastFlow ships an update every 5 days, Pengu every 9 days. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.
| Parameter | FastFlow | Pengu |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 days — better | Every 9 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 11 MB | 58 MB |
| Age rating | 4+ | 4+ |
| Developer | 浩铭 顾 | junhee cho |
In-app purchases
FastFlow
- FastFlow Pro Monthly$0.991 Month
- FastFlow Pro Yearly$9.991 Year
Pengu
- Pengu Pro Weekly$4.997 Days
- Pengu Pro Monthly$5.991 Month
- Pengu Pro Yearly3 Days trial$39.991 Year









