# UbiVision Eye Chart vs Sigma M

The clearest difference is in-app purchases: Sigma M at none against UbiVision Eye Chart's 3. UbiVision Eye Chart's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. UbiVision Eye Chart sells 3 one-off in-app purchases. Sigma M asks for nothing beyond the download.

## The numbers

| Metric | UbiVision Eye Chart | Sigma M |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Weekly | — |
| Size | 3 MB | 20 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Ingenieurbüro Edelmann](https://appshunter.io/developer/388950544) | [Sigma Momentum Inc.](https://appshunter.io/developer/1868574728) |

## What reviewers say

### UbiVision Eye Chart

[App page](https://appshunter.io/ios/app/ubivision-eye-chart/id6744323089)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy another test | $1.99 | one-time |
| Buy three more tests | $2.99 | one-time |
| Buy five more tests | $3.99 | one-time |


### Sigma M

[App page](https://appshunter.io/ios/app/sigma-m/id6757730417)

**In-app purchases:** none


## Frequently asked questions

### Is UbiVision Eye Chart free?

UbiVision Eye Chart is free to download, with in-app purchases available.

### Is Sigma M free?

Sigma M 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.*