# KCSDI vs RAYSID

The clearest difference is update cadence: RAYSID at weekly against KCSDI's every 3 weeks. KCSDI's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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, RAYSID weekly. The most recent releases landed on September 9, 2026 and July 17, 2026 respectively.

## The numbers

| Metric | KCSDI | RAYSID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/raysid/id6763330523/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | — | Free |
| Size | 31 MB | 145 MB |
| Requires iOS | **15.5** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Chengdu KeChuang Institute of Science and Culture](https://appshunter.io/developer/1690764978) | [Isai Olvera](https://appshunter.io/developer/1895267343) |

## What reviewers say

### KCSDI

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

**Features:** macOS Compatibility

**In-app purchases:** none


### RAYSID

[App page](https://appshunter.io/ios/app/raysid/id6763330523)

This app connects to a RAYSID gamma spectrometer via Bluetooth to display real-time radiation data. It offers detailed spectrum analysis, automatic isotope identification, and customizable device alarms. Data is stored locally on your phone.

**Highlights:** Real-time count rate and dose rate, Automatic isotope identification, High-resolution spectrum analysis, Device threshold alarms with notifications, Export spectrum data to N42 file, Phone-side Geiger clicks

**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 RAYSID free?

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

### Do KCSDI or RAYSID have ads?

Neither KCSDI nor RAYSID shows ads.

### Which is updated more often, KCSDI or RAYSID?

KCSDI ships an update every 3 weeks, and RAYSID weekly. Most recently, KCSDI was updated on September 9, 2026 and RAYSID on July 17, 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.*