# iSDR vs SatNOGS

The clearest difference is price: SatNOGS at Free against iSDR's $0.99. SatNOGS also leads on rating (5.0 vs 2.5) and in-app purchases (none vs 1). iSDR's advantage is iOS requirement (9.0 vs 15.0). On ratings volume, update cadence, ads and device support there is nothing between them.

SatNOGS is free to download; iSDR costs $0.99 up front. iSDR sells 1 one-off in-app purchase. SatNOGS asks for nothing beyond the download.

SatNOGS holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 11 and 4 respectively.

iSDR ships an update every 3 months, SatNOGS every 5 months. The most recent releases landed on October 4, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | iSDR | SatNOGS |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.5 (11 ratings)](https://appshunter.io/ios/app/isdr/id480077371/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/satnogs/id1669797826/reviews)** |
| Number of ratings | **11** | 4 |
| Positive reviews | 51.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Paid | **Free** |
| Size | 36 MB | 48 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Digital Confections LLC](https://appshunter.io/developer/480077374) | [Victor Belov](https://appshunter.io/developer/1356487489) |

## What reviewers say

### iSDR

[App page](https://appshunter.io/ios/app/isdr/id480077371)

This app allows experimenters and amateur radio enthusiasts to build a portable software-defined radio receiver using their iOS device. It processes radio signals using the device's processor and offers various display and filtering modes. Additional hardware is required for live signal reception.

**Highlights:** Six receive mode settings (USB, LSB, CW, AM, FM, Binaural), Selectable bandwidth settings, 120 dB dynamic range signal strength meter, Three AGC settings (fast, slow, off), Spectrum, Waterfall, and Oscilloscope display modes, Supports downloaded audio-format spectrum files via iTunes, Embed center frequency in file names for automatic display

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wi-Fi Radio Control | Free | one-time |


### SatNOGS

[App page](https://appshunter.io/ios/app/satnogs/id1669797826)

Access a global network of satellite ground stations to communicate with satellites and observe their data. The platform is open to all, with public observation results freely distributed. Resources are available for building your own ground station.

**Highlights:** Global ground station network access, Remote ground station operation, Satellite communication, Public observation data access, Ground station building resources

**In-app purchases:** none


## Frequently asked questions

### Is iSDR free?

iSDR costs $0.99, and also offers in-app purchases.

### Is SatNOGS free?

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

### Which has better reviews, iSDR or SatNOGS?

SatNOGS is rated higher. iSDR averages 2.5 out of 5 from 11 ratings, while SatNOGS averages 5.0 from 4 ratings.

### Do iSDR or SatNOGS have ads?

Neither iSDR nor SatNOGS shows ads.

### Which is updated more often, iSDR or SatNOGS?

iSDR ships an update every 3 months, and SatNOGS every 5 months. Most recently, iSDR was updated on October 4, 2026 and SatNOGS on October 1, 2026.

---

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