# TD vs iCDSS

The clearest difference is update cadence: iCDSS at monthly against TD's every 50 months. TD's advantage is iOS requirement (8.0 vs 12.0). 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.

TD ships an update every 50 months, iCDSS monthly. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | TD | iCDSS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 50 months | **Monthly** |
| Size | 6 MB | 125 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [杏生 卢](https://appshunter.io/developer/1094592555) | [Beijing Ande Medical Technology Co., Ltd.](https://appshunter.io/developer/1464887426) |

## What reviewers say

### TD

[App page](https://appshunter.io/ios/app/td-7s/id1324437064)

**Features:** macOS Compatibility

**In-app purchases:** none


### iCDSS

[App page](https://appshunter.io/ios/app/icdss/id1619035094)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TD free?

TD is free to download, with no in-app purchases.

### Is iCDSS free?

iCDSS is free to download, with no in-app purchases.

### Do TD or iCDSS have ads?

Neither TD nor iCDSS shows ads.

### Which is updated more often, TD or iCDSS?

TD ships an update every 50 months, and iCDSS monthly. Most recently, TD was updated on October 14, 2026 and iCDSS on October 8, 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.*