# Graph Calc Plus vs Echo

The clearest difference is price: Echo at Free against Graph Calc Plus's $2.99. Echo also leads on update cadence (weekly vs every 39 months). Graph Calc Plus's advantage is in-app purchases (none vs 2) and iOS requirement (14.0 vs 17.0). On ads and device support there is nothing between them.

Echo is free to download; Graph Calc Plus costs $2.99 up front. Echo sells 2 in-app purchases, starting at $4.99 per month. Graph Calc Plus asks for nothing beyond the download.

Graph Calc Plus ships an update every 39 months, Echo weekly. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Graph Calc Plus | Echo |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (33 ratings)](https://appshunter.io/ios/app/echo-global-sdr-receiver/id6759174390/reviews)** |
| Number of ratings | — | **33** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Weekly** |
| Monetization | — | Free |
| Size | 1 MB | 11 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Mark Garrison Jr.](https://appshunter.io/developer/1877165041) |

## What reviewers say

### Graph Calc Plus

[App page](https://appshunter.io/ios/app/graph-calc-plus/id1612916130)

**Features:** macOS Compatibility

**In-app purchases:** none


### Echo

[App page](https://appshunter.io/ios/app/echo-global-sdr-receiver/id6759174390)

Tune into thousands of remote radio servers worldwide from your iPhone or iPad. Explore shortwave broadcasts, aviation communications, and more with a global interactive map and advanced tuning features. Enjoy uninterrupted background audio and a privacy-first experience.

**Highlights:** Global interactive map and search, Support for multiple SDR architectures, Scanner mode and OpenMHz archives, Pro-level tuning and analytics, Offline frequency library and logging, Uninterrupted background audio, Privacy-first design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Echo Pro Monthly | $4.99 | per month |
| Echo Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Graph Calc Plus free?

Graph Calc Plus costs $2.99, with no in-app purchases.

### Is Echo free?

Echo is free to download, with in-app purchases available.

### Do Graph Calc Plus or Echo have ads?

Neither Graph Calc Plus nor Echo shows ads.

### Which is updated more often, Graph Calc Plus or Echo?

Graph Calc Plus ships an update every 39 months, and Echo weekly. Most recently, Graph Calc Plus was updated on October 7, 2026 and Echo on October 12, 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.*