# MSR Mail Tracker vs Letter Tracking System

The clearest difference is update cadence: MSR Mail Tracker at every 3 months against Letter Tracking System's every 11 months. MSR Mail Tracker also leads on iOS requirement (11.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MSR Mail Tracker ships an update every 3 months, Letter Tracking System every 11 months. The most recent releases landed on September 6, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | MSR Mail Tracker | Letter Tracking System |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 11 months |
| Size | 21 MB | 47 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TRACKEX LLC](https://appshunter.io/developer/1492982032) | [GCCloud Info System Private Limited](https://appshunter.io/developer/1559340757) |

## What reviewers say

### MSR Mail Tracker

[App page](https://appshunter.io/ios/app/msr-mail-tracker/id6449599992)

**Features:** macOS Compatibility

**In-app purchases:** none


### Letter Tracking System

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

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

**In-app purchases:** none


## Frequently asked questions

### Is MSR Mail Tracker free?

MSR Mail Tracker is free to download, with no in-app purchases.

### Is Letter Tracking System free?

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

### Do MSR Mail Tracker or Letter Tracking System have ads?

Neither MSR Mail Tracker nor Letter Tracking System shows ads.

### Which is updated more often, MSR Mail Tracker or Letter Tracking System?

MSR Mail Tracker ships an update every 3 months, and Letter Tracking System every 11 months. Most recently, MSR Mail Tracker was updated on September 6, 2026 and Letter Tracking System on September 9, 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.*