# FastZen vs SympTrack AI

The clearest difference is iOS requirement: SympTrack AI at 15.6 against FastZen's 26.0. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. FastZen sells 5 in-app purchases, starting at $1.99 per 7 days and SympTrack AI sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for FastZen against 5.0 for SympTrack AI. Both are backed by a comparable volume of ratings — 9 and 5 respectively.

FastZen ships an update every 5 days, SympTrack AI weekly. The most recent releases landed on September 23, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | FastZen | SympTrack AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (9 ratings)](https://appshunter.io/ios/app/fastzen-intermittent-fasting/id6744087602/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/symptrack-ai/id6748820634/reviews) |
| Number of ratings | **9** | 5 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Freemium | Freemium |
| Size | 27 MB | 137 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [MefjuDev LLC](https://appshunter.io/developer/1777787735) | [Noah Erdahl](https://appshunter.io/developer/1827459561) |

## What reviewers say

### FastZen

[App page](https://appshunter.io/ios/app/fastzen-intermittent-fasting/id6744087602)

This app helps you manage your intermittent fasting journey with custom schedules, progress tracking, and smart reminders. Achieve your weight loss and energy goals with a clean, intuitive interface and motivational features.

**Highlights:** Custom fasting schedules (16:8, 20:4, OMAD, up to 168 hours), Progress tracking with history, streaks, and insights, Smart reminders for fasting start and end times, Achievements and milestones for motivation, Calendar view of completed fasts, Light and dark mode, Widgets

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $2.99 | per month |
| 3 Months | $7.99 | per 3 months |
| Yearly | $19.99 | per year |
| Lifetime | $39.99 | one-time |


### SympTrack AI

[App page](https://appshunter.io/ios/app/symptrack-ai/id6748820634)

This app allows users to privately log and monitor medication side effects. It uses AI to detect patterns and trends in your symptoms over time, helping you understand how medications are affecting you. Designed for ease of use, it offers smart reminders and organized logs.

**Highlights:** Anonymous symptom logging, AI-powered trend detection, Smart daily reminders, Auto-sorted symptom logs, Clean and fast interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SympTrack AI Premium | $2.99 | per month |
| SympTrack AI Premium | $29.99 | per year |


## Frequently asked questions

### Is FastZen free?

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

### Is SympTrack AI free?

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

### Which has better reviews, FastZen or SympTrack AI?

FastZen and SympTrack AI are both rated 5.0 out of 5 on the App Store, from 9 and 5 ratings respectively.

### Do FastZen or SympTrack AI have ads?

Neither FastZen nor SympTrack AI shows ads.

### Which is updated more often, FastZen or SympTrack AI?

FastZen ships an update every 5 days, and SympTrack AI weekly. Most recently, FastZen was updated on September 23, 2026 and SympTrack AI on September 26, 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.*