Quick Verdict
Both FastFlow AI and Fastic are solid intermittent fasting apps, but they serve different users. FastFlow AI stands out with its AI-powered fasting coach, AI food scanner, and integrated hydration reminders — all available for free or at a lower premium price. Fastic offers more fasting protocols and wider language support, but locks most features behind a more expensive paywall.
If you want the best free intermittent fasting app with AI coaching, calorie tracking, and hydration monitoring in one place — FastFlow AI is the better choice.
Feature-by-Feature Comparison
| Feature | FastFlow AI | Fastic |
|---|---|---|
| Free Fasting Timer | ||
| AI Fasting Coach | ||
| Fasting Protocols (Free) | 2 (16:8, 18:6) | 1 (16:8) |
| Fasting Protocols (Total) | 5 | 7 |
| Hydration Tracking | ||
| Hydration Reminders | ||
| Calorie Tracking | ||
| AI Food Scanner | ||
| Weight Tracking | ||
| Fasting Zones | 5 Zones | Basic |
| Daily Health Score | ||
| Streak System | ||
| Streak Jokers | 3/month | |
| Multi-language | 5 languages | 10+ languages |
| Dark Mode | ||
| Free Tier Ads | Minimal | Heavy |
| Premium Price | From $2.99/week | From $4.99/week |
1. Fasting Timer & Protocols
Both apps offer a countdown fasting timer, but the details differ. FastFlow AI gives you 2 free fasting protocols (16:8 and 18:6), while Fastic only offers 16:8 for free. FastFlow AI supports 5 total protocols: 14:10, 16:8, 18:6, 20:4, and 23:1 (OMAD). Fastic supports more protocols overall including 5:2 and custom schedules.
If you practice 16:8 fasting or 18:6 fasting, both apps work well. For OMAD, FastFlow AI has dedicated support while Fastic treats it as a custom schedule.
2. AI Coaching
This is where FastFlow AI truly shines. It includes a real AI fasting coach powered by Google Gemini that answers your fasting questions, provides personalized advice, and keeps you motivated throughout your fast.
Fastic does not have an AI coach. It provides tips and articles, but you cannot have a conversation or get personalized advice. If AI-powered health coaching matters to you, FastFlow AI is the clear winner.
3. Calorie Tracking & Food Scanner
Both apps include calorie tracking, but FastFlow AI includes an AI food scanner that can identify food from a photo and automatically estimate calories and macros. You can also try it right on our website with our free calorie calculator.
Fastic has a manual food database for logging. FastFlow AI's AI approach is faster and more convenient, especially for home-cooked meals that aren't in standard databases.
4. Hydration Tracking
Staying hydrated during fasting is crucial. How much water you should drink while fasting depends on your weight, activity level, and climate.
FastFlow AI includes a dedicated water tracker with smart hydration reminders that adjust to your fasting schedule. Fastic has basic water logging but no reminders or personalized hydration goals.
5. Weight Tracking
Both apps let you log your weight and view trends over time. FastFlow AI shows weight trends with BMI calculation (also available as a free BMI calculator on our website). Premium users get advanced weight trend analytics. Use our TDEE calculator to find the right calorie intake for your weight goals.
6. Gamification & Motivation
FastFlow AI features a daily health score that combines your fasting, hydration, and calorie data into a single score — giving you a daily target to aim for. It also has a streak system with streak jokers (3 per month for premium users) so one bad day doesn't break your progress.
Fastic has streaks and achievements, but no daily health score or streak protection. The achievement system in Fastic is more extensive with badges.
7. Fasting Zones
FastFlow AI tracks 5 distinct fasting zones — from fed state through anabolic, catabolic, fat burning, to deep ketosis. Each zone shows what's happening in your body at that moment. Read our detailed guide on fasting zones explained. Fastic shows basic fasting stages but with less scientific detail.
8. Pricing Comparison
FastFlow AI Premium
- Weekly: $2.99/week
- Monthly: $7.99/month
- Yearly: $39.99/year
- Generous free tier
Fastic Premium
- Weekly: $4.99/week
- Monthly: $12.99/month
- Yearly: $59.99/year
- Limited free tier
FastFlow AI is significantly more affordable at every tier, and its free version includes more features than Fastic's free tier — including AI coaching (3 messages/day) and the AI food scanner (2 scans/day).
Choose FastFlow AI If You Want:
- AI-powered fasting coach
- AI food scanner for easy calorie logging
- Smart hydration reminders
- Daily health score to stay motivated
- Lower price with more free features
- All-in-one health tracking
Choose Fastic If You Want:
- More fasting protocol options
- Larger language support (10+)
- Extensive food database
- Community features
- More badges and achievements
Frequently Asked Questions
Is FastFlow AI really free?
Yes! FastFlow AI offers a generous free tier with fasting timer, 2 protocols (16:8 and 18:6), hydration tracking, calorie tracking, AI coaching (3 messages/day), and AI food scanner (2 scans/day). Premium unlocks unlimited AI, all 5 protocols, no ads, and advanced features.
Which app is better for beginners?
FastFlow AI is better for beginners because of the AI coach, which can answer questions and guide you through your fasting journey. The daily health score also makes it easier to build consistent habits.
Does Fastic have an AI coach?
No. Fastic provides pre-written tips and educational articles, but it does not have an interactive AI coach. FastFlow AI's AI coach is powered by Google Gemini and can have personalized conversations about your fasting goals.
Which fasting app has better calorie tracking?
FastFlow AI has an AI food scanner that identifies food from photos and estimates calories and macros automatically. Fastic uses a manual food database. For convenience, FastFlow AI's approach is faster and works better for home-cooked meals.
Can I use these apps on iPhone and Android?
FastFlow AI is available on both Google Play and the App Store. Fastic is also available on both platforms.
Which app is cheaper?
FastFlow AI is significantly cheaper at every subscription tier. Weekly: $2.99 vs $4.99. Monthly: $7.99 vs $12.99. Yearly: $39.99 vs $59.99. FastFlow AI also offers more in its free tier.
Ready to Try FastFlow AI?
Download FastFlow AI for free and experience the best intermittent fasting app with AI coaching, food scanning, and hydration tracking — all in one place.