# Fast vs Ai1

The clearest difference is rating: Fast at 4.7 against Ai1's 2.8. Fast also leads on ratings volume (3.3K vs 4). Ai1's advantage is in-app purchases (none vs 8) and update cadence (monthly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Fast sells 8 in-app purchases, starting at $4.99 per month. Ai1 asks for nothing beyond the download.

Fast holds the better App Store score, 4.7 against 2.8. That said, the two scores are not equally well evidenced: Fast has 3.3K ratings behind it against 4, so its average is the more settled of the two.

Fast ships an update every 2 months, Ai1 monthly. The most recent releases landed on October 29, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Fast | Ai1 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3.3K ratings)](https://appshunter.io/ios/app/fast-fasting-tracker-and-timer/id1545737691/reviews)** | [2.8 (4 ratings)](https://appshunter.io/ios/app/ai1-ayuno-intermitente/id1587423247/reviews) |
| Number of ratings | **3.3K** | 4 |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 116 MB | 38 MB |
| Requires iOS | 18.6 | **11.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Maxima Apps](https://appshunter.io/developer/1153277200) | [Siempre Somos S de RL de CV](https://appshunter.io/developer/1649636009) |

## What reviewers say

### Fast

[App page](https://appshunter.io/ios/app/fast-fasting-tracker-and-timer/id1545737691)

This app helps you track intermittent fasting routines, monitor progress, and analyze health data. It offers educational content, motivational challenges, and a journal to record your feelings. Connect with friends for support and motivation on your wellness journey.

**Highlights:** Fasting timer and tracker, Progress analytics and history, Educational 'Know It' section, Motivational challenges and trophies, Mood tracker and journal, Health app integration (steps), Fasting buddy feature

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast Premium Monthly | $4.99 | per month |
| Fasting Monthly | $14.99 | per month |
| Fasting Annually | $19.99 | per year |
| Fasting Premium | $27.99 | per 3 months |
| Fast Premium Yearly | $29.99 | per year |
| Fasting Premium Yearly | $39.99 | per year |
| Fasting One Time Special Offer | $19.99 | one-time |
| Fasting Pro | $49.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Helpful for weight loss
- 👍 Motivating with trophies
- 👍 Customizable fasting plans
- 👍 Integrates with health apps

**What reviewers complain about**

- 🐛 Timer issues/inaccuracies
- 🐛 Inability to edit fasting times
- 🐛 Syncing/data saving problems
- 🐛 Crashes and glitches
- 🔍 Lacking advanced features

**Reported bugs**

- Timer not accurately recording fasting times
- Inability to update weight in app
- Crashing when trying to view friend's status

**Requested features**

- Option to edit fasting start/end times
- More detailed analytics and progress tracking
- Improved syncing and data saving reliability
- Expanded customization options


### Ai1

[App page](https://appshunter.io/ios/app/ai1-ayuno-intermitente/id1587423247)

This app simplifies intermittent fasting with an easy-to-understand interface. It supports users in their journey towards weight loss, improved concentration, and overall well-being, regardless of their experience level.

**Highlights:** Easy intermittent fasting tracking, Simple interface, Supports weight loss goals, Improves concentration, Enhances overall well-being, Suitable for beginners and experts

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Fast free?

Fast is free to download, with in-app purchases available.

### Is Ai1 free?

Ai1 is free to download, with no in-app purchases.

### Which has better reviews, Fast or Ai1?

Fast is rated higher. Fast averages 4.7 out of 5 from 3.3K ratings, while Ai1 averages 2.8 from 4 ratings.

### Do Fast or Ai1 have ads?

Neither Fast nor Ai1 shows ads.

### Which is updated more often, Fast or Ai1?

Fast ships an update every 2 months, and Ai1 monthly. Most recently, Fast was updated on October 29, 2026 and Ai1 on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*