# ECHO Pro vs PiCalculator!

The clearest difference is iOS requirement: ECHO Pro at 15.0 against PiCalculator!'s 26.0. On price 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.

## The numbers

| Metric | ECHO Pro | PiCalculator! |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 2 weeks | — |
| Monetization | Free | — |
| Size | 103 MB | 1 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Echo Laboratories](https://appshunter.io/developer/935502816) | [Nicolo Campari](https://appshunter.io/developer/1692038826) |

## What reviewers say

### ECHO Pro

[App page](https://appshunter.io/ios/app/echo-pro/id1052945965)

This app transforms your compatible iPad into a powerful microscope control and imaging device. Capture, annotate, and share high-quality brightfield and fluorescence images with intuitive on-screen controls and advanced features like Anti-Shake.

**Highlights:** Brightfield imaging with adjustable contrast, Epi-fluorescence imaging (Revolve microscope), Anti-Shake feature for blur-free images, Integrated photo browser and cloud sharing, Photo annotation for cell counting and measurements, Automatic saving of image settings

**In-app purchases:** none


### PiCalculator!

[App page](https://appshunter.io/ios/app/picalculator/id6450142995)

**In-app purchases:** none


## Frequently asked questions

### Is ECHO Pro free?

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

### Is PiCalculator! free?

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

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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.*