# OONI Probe vs Modulus Calculator

The clearest difference is review sentiment: Modulus Calculator at 100% against OONI Probe's 58%. Modulus Calculator also leads on rating (4.8 vs 4.5) and iOS requirement (11.0 vs 15.0). OONI Probe's advantage is ratings volume (88 vs 8). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Modulus Calculator holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: OONI Probe has 88 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 58% of OONI Probe's written reviews are positive against 100% of Modulus Calculator's.

## The numbers

| Metric | OONI Probe | Modulus Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (88 ratings)](https://appshunter.io/ios/app/ooni-probe/id1199566366/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/modulus-calculator/id1432356578/reviews)** |
| Number of ratings | **88** | 8 |
| Positive reviews | 58.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | Free |
| Size | 139 MB | 1 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Tor Project](https://appshunter.io/developer/1199566365) | [Theodore Dubois](https://appshunter.io/developer/1432356577) |

## What reviewers say

### OONI Probe

[App page](https://appshunter.io/ios/app/ooni-probe/id1199566366)

This app helps you detect internet censorship and surveillance systems by examining website and app blocking. It also measures your network's speed and performance, providing data that can serve as evidence of interference. All collected data is published openly to promote transparency.

**Highlights:** Examine website and app blocking, Measure network speed and performance, Detect censorship and surveillance systems, Collect evidence of internet censorship, Publish open network measurement data, Free and open source software

**Features:** Vision Pro support

**In-app purchases:** none


### Modulus Calculator

[App page](https://appshunter.io/ios/app/modulus-calculator/id1432356578)

This utility app functions as a standard calculator but performs all operations within a specified modulus. It supports powers and inverses, with division implemented through multiplication by the inverse. Easily switch the modulus using the dedicated indicator.

**Highlights:** Modulus-based calculations, Support for powers and inverses, Division via modular inverse, Easy modulus switching, Calculator interface

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

**In-app purchases:** none


## Frequently asked questions

### Is OONI Probe free?

OONI Probe is free to download, with no in-app purchases.

### Is Modulus Calculator free?

Modulus Calculator is free to download, with no in-app purchases.

### Which has better reviews, OONI Probe or Modulus Calculator?

Modulus Calculator is rated higher. OONI Probe averages 4.5 out of 5 from 88 ratings, while Modulus Calculator averages 4.8 from 8 ratings.

### Do OONI Probe or Modulus Calculator have ads?

Neither OONI Probe nor Modulus Calculator shows ads.

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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.*