# Flash Studio vs Spectrum SDR (RTL

The clearest difference is review sentiment: Spectrum SDR (RTL at 100% against Flash Studio's 56%. Spectrum SDR (RTL also leads on ads (none vs shown). Flash Studio's advantage is in-app purchases (none vs 1) and ratings volume (3.4K vs 2). On price, update cadence and device support there is nothing between them.

Both are free to download. Spectrum SDR (RTL sells 1 one-off in-app purchase. Flash Studio asks for nothing beyond the download.

Flash Studio holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Flash Studio has 3.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 56% of Flash Studio's written reviews are positive against 100% of Spectrum SDR (RTL's, so the app with the better star average is not the one people write more warmly about.

Flash Studio ships an update weekly, Spectrum SDR (RTL every 11 days. The most recent releases landed on September 28, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Flash Studio | Spectrum SDR (RTL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.4K ratings)](https://appshunter.io/ios/app/flash-studio/id6756779254/reviews)** | [4.5 (2 ratings)](https://appshunter.io/ios/app/spectrum-sdr-rtl-sdr/id6764391865/reviews) |
| Number of ratings | **3.4K** | 2 |
| Positive reviews | 55.9% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | Ad-supported | **Free** |
| Size | 99 MB | 7 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [浙江闪铸三维科技有限公司](https://appshunter.io/developer/999198567) | [James Mainwaring](https://appshunter.io/developer/1895761181) |

## What reviewers say

### Flash Studio

[App page](https://appshunter.io/ios/app/flash-studio/id6756779254)

Manage your 3D printers remotely from your smartphone. Monitor print status, view live video feeds of your printer's operations, and control multiple printers simultaneously.

**Highlights:** Remote printer monitoring, Real-time video feed, Manage grouped printers, On-the-go management, Smartphone integration

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

**In-app purchases:** none


### Spectrum SDR (RTL

[App page](https://appshunter.io/ios/app/spectrum-sdr-rtl-sdr/id6764391865)

Explore radio signals with your RTL-SDR dongle. Listen to AM/FM/SSB/CW, view FFT and waterfall displays, and customize your experience. Requires a remote rtl_tcp instance over WiFi.

**Highlights:** Full frequency range support, AM, FM, SSB, CW reception, FFT and Waterfall displays, Adjustable sample rates, Bias tee and gain controls, Squelch functionality, Customizable display options

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


## Frequently asked questions

### Is Flash Studio free?

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

### Is Spectrum SDR (RTL free?

Spectrum SDR (RTL is free to download, with in-app purchases available.

### Which has better reviews, Flash Studio or Spectrum SDR (RTL?

Flash Studio is rated higher. Flash Studio averages 4.8 out of 5 from 3.4K ratings, while Spectrum SDR (RTL averages 4.5 from 2 ratings.

### Do Flash Studio or Spectrum SDR (RTL have ads?

Flash Studio shows ads; Spectrum SDR (RTL does not.

### Which is updated more often, Flash Studio or Spectrum SDR (RTL?

Flash Studio ships an update weekly, and Spectrum SDR (RTL every 11 days. Most recently, Flash Studio was updated on September 28, 2026 and Spectrum SDR (RTL on September 23, 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.*