# Smart Office by D Soft vs Letter Tracking System

The clearest difference is update cadence: Smart Office by D Soft at every 3 days against Letter Tracking System's every 11 months. 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.

Smart Office by D Soft ships an update every 3 days, Letter Tracking System every 11 months. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Smart Office by D Soft | Letter Tracking System |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 11 months |
| Size | 43 MB | 47 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [D-SOFT JOINT STOCK](https://appshunter.io/developer/1548424501) | [GCCloud Info System Private Limited](https://appshunter.io/developer/1559340757) |

## What reviewers say

### Smart Office by D Soft

[App page](https://appshunter.io/ios/app/smart-office-by-d-soft/id6737820155)

**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 Smart Office by D Soft free?

Smart Office by D Soft 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 Smart Office by D Soft or Letter Tracking System have ads?

Neither Smart Office by D Soft nor Letter Tracking System shows ads.

### Which is updated more often, Smart Office by D Soft or Letter Tracking System?

Smart Office by D Soft ships an update every 3 days, and Letter Tracking System every 11 months. Most recently, Smart Office by D Soft was updated on October 11, 2026 and Letter Tracking System on October 12, 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.*