# AI Butt Identifier vs Simple Gym Tracker

The clearest difference is ads: AI Butt Identifier at none against Simple Gym Tracker's shown. Simple Gym Tracker's advantage is update cadence (every 9 days vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. AI Butt Identifier sells 2 in-app purchases, starting at $4.99 per month and Simple Gym Tracker sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AI Butt Identifier ships an update every 3 months, Simple Gym Tracker every 9 days. The most recent releases landed on September 8, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | AI Butt Identifier | Simple Gym Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 9 days** |
| Size | 30 MB | 65 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HE HE](https://appshunter.io/developer/1184879980) | [Jasuda Tech](https://appshunter.io/developer/6774026152) |

## What reviewers say

### AI Butt Identifier

[App page](https://appshunter.io/ios/app/ai-butt-identifier/id6749545002)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Annual Subscription | $29.99 | per year |


### Simple Gym Tracker

[App page](https://appshunter.io/ios/app/simple-gym-trackerworkout-log/id6776331878)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekley Pro | $1.99 | per 7 days |
| Yearly Pro | $49.99 | per year |
| Gym Tracker Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is AI Butt Identifier free?

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

### Is Simple Gym Tracker free?

Simple Gym Tracker is free to download, with in-app purchases available.

### Do AI Butt Identifier or Simple Gym Tracker have ads?

Simple Gym Tracker shows ads; AI Butt Identifier does not.

### Which is updated more often, AI Butt Identifier or Simple Gym Tracker?

AI Butt Identifier ships an update every 3 months, and Simple Gym Tracker every 9 days. Most recently, AI Butt Identifier was updated on September 8, 2026 and Simple Gym Tracker on September 15, 2026.

---

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