# Letter Tracking System vs BypassGPT Pro

The clearest difference is in-app purchases: Letter Tracking System at none against BypassGPT Pro's 2. BypassGPT Pro's advantage is update cadence (every 3 months vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. BypassGPT Pro sells 2 in-app purchases, starting at $7.99 per 7 days. Letter Tracking System asks for nothing beyond the download.

Letter Tracking System ships an update every 11 months, BypassGPT Pro every 3 months. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Letter Tracking System | BypassGPT Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Size | 47 MB | 32 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GCCloud Info System Private Limited](https://appshunter.io/developer/1559340757) | [Sarun A K](https://appshunter.io/developer/1768048074) |

## What reviewers say

### Letter Tracking System

[App page](https://appshunter.io/ios/app/letter-tracking-system/id6743742291)

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

**In-app purchases:** none


### BypassGPT Pro

[App page](https://appshunter.io/ios/app/bypassgpt-pro-ai-humanizer/id6761008375)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription Weekly | $7.99 | per 7 days |
| Premium Subscription Monthly | $17.99 | per month |


## Frequently asked questions

### Is Letter Tracking System free?

Letter Tracking System is free to download, with no in-app purchases.

### Is BypassGPT Pro free?

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

### Do Letter Tracking System or BypassGPT Pro have ads?

Neither Letter Tracking System nor BypassGPT Pro shows ads.

### Which is updated more often, Letter Tracking System or BypassGPT Pro?

Letter Tracking System ships an update every 11 months, and BypassGPT Pro every 3 months. Most recently, Letter Tracking System was updated on October 25, 2026 and BypassGPT Pro on October 10, 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.*