# Echo Calculate vs VISPro

The clearest difference is price: Echo Calculate at Free against VISPro's $0.99. Echo Calculate also leads on iOS requirement (15.6 vs 17.0). VISPro's advantage is in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 6 months). On ads and device support there is nothing between them.

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

Echo Calculate ships an update every 6 months, VISPro every 2 weeks. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Echo Calculate | VISPro |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Best chart rank | — | **#189** |
| Size | 26 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Gundogan Emre](https://appshunter.io/developer/1651146056) | [Readfeed, Inc.](https://appshunter.io/developer/622344161) |

## What reviewers say

### Echo Calculate

[App page](https://appshunter.io/ios/app/echo-calculate/id1660468437)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Echo Calculate Premium | $3.99 | one-time |


### VISPro

[App page](https://appshunter.io/ios/app/vispro-vis-calculator/id6760238459)

**Currently charting:** #189 Top Paid · Medical (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Echo Calculate free?

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

### Is VISPro free?

VISPro costs $0.99, with no in-app purchases.

### Do Echo Calculate or VISPro have ads?

Neither Echo Calculate nor VISPro shows ads.

### Which is updated more often, Echo Calculate or VISPro?

Echo Calculate ships an update every 6 months, and VISPro every 2 weeks. Most recently, Echo Calculate was updated on October 3, 2026 and VISPro on October 24, 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.*