# Fast AI vs Docdoc.az

The clearest difference is in-app purchases: Docdoc.az at none against Fast AI's 5. Docdoc.az also leads on update cadence (weekly vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Fast AI sells 5 in-app purchases, starting at $5.99 per 7 days. Docdoc.az asks for nothing beyond the download.

Fast AI ships an update every 2 weeks, Docdoc.az weekly. The most recent releases landed on October 12, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Fast AI | Docdoc.az |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (120 ratings)](https://appshunter.io/ios/app/fast-ai-intermittent-fasting/id1629661646/reviews)** | — |
| Number of ratings | **120** | — |
| Positive reviews | 7.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 101 MB | 43 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Kiryl Salavei](https://appshunter.io/developer/1033680093) | [VA Group](https://appshunter.io/developer/1885175395) |

## What reviewers say

### Fast AI

[App page](https://appshunter.io/ios/app/fast-ai-intermittent-fasting/id1629661646)

This app helps users achieve weight loss and improve well-being through intermittent fasting. It provides tracking, scheduling, and detailed analytics to guide users through various fasting plans. The app aims to make fasting a natural and effective part of a healthy lifestyle.

**Highlights:** Intermittent fasting tracker, Weight monitoring, Fasting and food window notifications, Detailed analytics, Multiple fasting schemes (e.g., 16/8), Fasting schedule, Apple Health weight sync

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple intermittent fasting | $5.99 | per 7 days |
| Intermittent Fasting 1 Month | $12.99 | per month |
| Personal Fast Program 3 Month | $19.99 | per 3 months |
| Intermittent Fasting + Tracker | $35.99 | per year |
| Intermittent Fasting Annual | $49.99 | per year |


### Docdoc.az

[App page](https://appshunter.io/ios/app/docdocaz/id6760585213)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Fast AI free?

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

### Is Docdoc.az free?

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

### Do Fast AI or Docdoc.az have ads?

Neither Fast AI nor Docdoc.az shows ads.

### Which is updated more often, Fast AI or Docdoc.az?

Fast AI ships an update every 2 weeks, and Docdoc.az weekly. Most recently, Fast AI was updated on October 12, 2026 and Docdoc.az on October 1, 2026.

---

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