# KCSDI vs Decay Lab

The clearest difference is update cadence: Decay Lab at every 4 days against KCSDI's every 3 weeks. KCSDI's advantage is iOS requirement (15.5 vs 17.0). 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.

KCSDI ships an update every 3 weeks, Decay Lab every 4 days. The most recent releases landed on October 13, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | KCSDI | Decay Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 31 MB | 6 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Chengdu KeChuang Institute of Science and Culture](https://appshunter.io/developer/1690764978) | [Carlos Uribe](https://appshunter.io/developer/1818871232) |

## What reviewers say

### KCSDI

[App page](https://appshunter.io/ios/app/kcsdi/id6667098118)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decay Lab

[App page](https://appshunter.io/ios/app/decay-lab/id6746874842)

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

**In-app purchases:** none


## Frequently asked questions

### Is KCSDI free?

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

### Is Decay Lab free?

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

### Do KCSDI or Decay Lab have ads?

Neither KCSDI nor Decay Lab shows ads.

### Which is updated more often, KCSDI or Decay Lab?

KCSDI ships an update every 3 weeks, and Decay Lab every 4 days. Most recently, KCSDI was updated on October 13, 2026 and Decay Lab on October 19, 2026.

---

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