Comparison

OONI Probe vs S3Crypt

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OONI Probe

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
Read full description

Are websites and social media apps blocked? Is your network unusually slow? Run OONI Probe to find out! With this app, you will examine the blocking of websites and instant messaging apps, measure your network's speed and performance, and check whether systems that could be responsible for censorship and surveillance are in your network. OONI Probe is developed by the Open Observatory of Network Interference (OONI), a free software project (under The Tor Project) that aims to uncover internet censorship around the world. Since 2012, OONI’s global community has collected millions of network measurements from more than 200 countries, shedding light on multiple cases of network interference. ▶ Collect evidence of internet censorship You can check whether and how websites and instant messaging apps are blocked. The network measurement data you will collect may serve as evidence of internet censorship. ▶ Detect systems responsible for censorship and surveillance OONI Probe tests are also designed to uncover the presence of systems (middleboxes) that could be responsible for censorship and surveillance. ▶ Measure the speed and performance of your network You can measure the speed and performance of your network by running OONI's implementation of the Network Diagnostic Test (NDT). You can also measure video streaming performance with the Dynamic Adaptive Streaming over HTTP (DASH) test. ▶ Open data OONI publishes network measurement data because open data allows third parties to verify OONI findings, conduct independent studies, and answer other research questions. Openly publishing OONI data also helps increase transparency of internet censorship around the world. You can explore and download OONI data here: https://ooni.io/data/ ▶ Free software All OONI Probe tests (including our NDT and DASH implementations), are based on free and open source software. You can find OONI software projects on GitHub: https://github.com/ooni. Curious to learn how OONI Probe tests work? Learn more: https://ooni.io/nettest/ To receive updates from the OONI-verse, follow us on Twitter: https://twitter.com/OpenObservatory

About

S3Crypt

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
Read full description

With S3Crypt you do not need to remember all your different and complex passwords, but instead you only need to remember two pieces of information. With those two pieces of information S3Crypt creates very secure and unique passwords. Use with or without a password manager. By using this app your secure passwords will be readily accessible even if your password manager is not available. The two pieces of information you need are very easy to remember: Master Key: Choose anything you want as long as it is known only to you, and remember your Master Key is always the same for every website! Unique Key: Choose any format that can be repeated for all your websites, and remember your Unique Key changes for each website! Examples: For Amazon: Master Key: ExampleMaster Unique Key: amazon For Costco: Master Key: ExampleMaster Unique Key: costco Notice in the examples that the Master Key was the same for both, but the Unique Key changed based on the website being used. Now that you have created a Master Key and a Unique Key format you are ready to use S3Crypt to create extremely secure passwords for each website.  To begin, type in your Master Key and Unique Key, then click Generate button. Next, copy the generated password to the clipboard by clicking the Copy button and then paste it in the password box on whatever website it was generated for. There is no need to memorize several passwords. You only need to remember your Master Key and your Unique Key format. The same website password can be recreated with the same Master Key and Unique Key pair. Key things to remember: 1) S3Crypt does not store or save any passwords. 2) You are the password manager. Only you can create your passwords. 3) Your Master Key never changes. 4) Your Unique Key "format" never changes. 5) Generated passwords are a derived from "both" the Master Key and Unique Key combination. Any difference results in a completely different password. 6) A generated password can never be used to determine the keys used to create it. 7) Both Master Key and Unique Key are case sensitive, in other words uppercase letters are different than lowercase letters and result in different passwords. Enjoy!

Screenshots

OONI Probe4 screens
S3Crypt4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
OONI Probe versus S3Crypt: the parameters behind the verdict, then further details
ParameterOONI ProbeS3Crypt
PriceFree — better$0.99
Rating4.5 (88 ratings)5.0 (4 ratings) — better
Positive reviews58.1% of reviews100.0% of reviews — better
Number of ratings88 — better4
Update frequencyEvery 2 months — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.2
Further details — not scored
Size139 MB2 MB
Age rating4+4+
DeveloperThe Tor ProjectBrian McAlister

Customer experience

OONI Probe

All ratings88 ratings
Positive86.4%
Neutral6.8%
Negative6.8%
Written reviews31 reviews
Positive58.1%
Neutral12.9%
Negative29.0%

S3Crypt

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

OONI Probe

No in-app purchases

None

S3Crypt

No in-app purchases

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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