# OONI Probe vs S3Crypt

The clearest difference is price: OONI Probe at Free against S3Crypt's $0.99. OONI Probe also leads on update cadence (every 2 months vs every 8 months) and ratings volume (88 vs 4). S3Crypt's advantage is review sentiment (100% vs 58%) and rating (5.0 vs 4.5). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

OONI Probe is free to download; S3Crypt costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

S3Crypt holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: OONI Probe has 88 ratings behind it against 4, 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 S3Crypt's.

OONI Probe ships an update every 2 months, S3Crypt every 8 months. The most recent releases landed on October 11, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | OONI Probe | S3Crypt |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.5 (88 ratings)](https://appshunter.io/ios/app/ooni-probe/id1199566366/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/s3crypt/id1609324228/reviews)** |
| Number of ratings | **88** | 4 |
| Positive reviews | 58.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | **Free** | Paid |
| Size | 139 MB | 2 MB |
| Requires iOS | **15.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Tor Project](https://appshunter.io/developer/1199566365) | [Brian McAlister](https://appshunter.io/developer/1609324230) |

## 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


### S3Crypt

[App page](https://appshunter.io/ios/app/s3crypt/id1609324228)

This app generates secure, unique passwords based on a master key and a unique key for each site. You only need to remember these two pieces of information to create and access your passwords, without needing a separate password manager.

**Highlights:** Generates secure, unique passwords, Uses a master key and unique key, No password storage, Passwords recreated with same keys, Case-sensitive key input, Copy password to clipboard

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OONI Probe free?

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

### Is S3Crypt free?

S3Crypt costs $0.99, with no in-app purchases.

### Which has better reviews, OONI Probe or S3Crypt?

S3Crypt is rated higher. OONI Probe averages 4.5 out of 5 from 88 ratings, while S3Crypt averages 5.0 from 4 ratings.

### Do OONI Probe or S3Crypt have ads?

Neither OONI Probe nor S3Crypt shows ads.

### Which is updated more often, OONI Probe or S3Crypt?

OONI Probe ships an update every 2 months, and S3Crypt every 8 months. Most recently, OONI Probe was updated on October 11, 2026 and S3Crypt on June 10, 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.*