# TEM2Go controller vs RAYSID

The clearest difference is device support: TEM2Go controller at 3 against RAYSID's 1. TEM2Go controller also leads on iOS requirement (13.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on September 11, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | TEM2Go controller | 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 | Weekly | Weekly |
| Monetization | — | Free |
| Size | 27 MB | 145 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Temcompany ApS](https://appshunter.io/developer/1700820640) | [Isai Olvera](https://appshunter.io/developer/1895267343) |

## What reviewers say

### TEM2Go controller

[App page](https://appshunter.io/ios/app/tem2go-controller/id6753285703)

**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 TEM2Go controller free?

TEM2Go controller is free to download, with no in-app purchases.

### Is RAYSID free?

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

### Do TEM2Go controller or RAYSID have ads?

Neither TEM2Go controller nor RAYSID shows ads.

### Which is updated more often, TEM2Go controller or RAYSID?

TEM2Go controller ships an update weekly, and RAYSID weekly. Most recently, TEM2Go controller was updated on September 11, 2026 and RAYSID on September 18, 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.*