Comparison

OONI Probe vs Swisscows Email

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

Swisscows Email

This secure email service prioritizes user privacy with end-to-end encryption and a commitment to not storing any data. It offers password-protected emails and is based in Switzerland under strict data protection laws.

Highlights
  • End-to-end encryption
  • Password-protected emails
  • No data storage policy
  • Swiss-based servers
  • Private and business use
Features
Read full description

Swisscows.email – Swiss made Secure. Private. Personal. We are Swisscows and we do not save your data! We respect your privacy and see it as our calling to protect your privacy. Swisscows is a company that promotes data protection and creates a protected space for Internet users. Swisscows is committed to creating safe alternatives in all areas! We take the privacy of our users very seriously. The secure email app Swisscows.email is one of the products with the most innovative security features. A letter is your personal property with Swiss security aspect and highly encrypted. Swisscows.email is an alternative solution for private and business email traffic, secured with innovative and most secure encryption. With Swisscows.email you can send password-protected, encrypted emails to all email addresses. Swisscows.email is entirely based in Switzerland, under the protection of the strictest data protection laws in the world. What we guarantee with Swisscows.email: - Our secure email is 100% read by nobody but you and your email will not be passed on to anyone but you! - No one but you will have access to the email inbox - not even us! - The servers are ALL in Switzerland and thus far away from NSA and EU! - The email is encrypted at the highest security level when it is sent! Follow Swisscows on social media to get the latest news and offers: Facebook: https://www.facebook.com/swisscows/ Twitter: https://twitter.com/swisscows_ch Instagram: https://www.instagram.com/swisscows.official/ Privacy Policy: https://swisscows.com/de/datenschutz General Terms and Conditions: https://swisscows.com/de/agb Cookie Policy: https://swisscows.com/de/cookie-richtlinie Apple Standard License Agreement https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For more information, see: https://accounts.swisscows.com/products/email

Screenshots

OONI Probe4 screens
Swisscows Email4 screens

Verdict

The call

The clearest difference is rating: OONI Probe at 4.5 against Swisscows Email's 3.0. OONI Probe also leads on in-app purchases (none vs 6) and ratings volume (91 vs 4). Swisscows Email's advantage is review sentiment (75% vs 58%) and update cadence (every 3 weeks vs every 2 months). On price, ads and device support 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

Both are free to download. Swisscows Email sells 6 in-app purchases, starting at $4.99 per month. OONI Probe asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OONI Probe holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: OONI Probe has 91 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 58% of OONI Probe's written reviews are positive against 75% of Swisscows Email's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

OONI Probe ships an update every 2 months, Swisscows Email every 3 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
OONI Probe versus Swisscows Email: the parameters behind the verdict, then further details
ParameterOONI ProbeSwisscows Email
PriceFreeFree
Rating4.5 (91 ratings) — better3.0 (4 ratings)
Positive reviews58.1% of reviews75.0% of reviews — better
Number of ratings91 — better4
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size139 MB49 MB
Age rating4+4+
DeveloperThe Tor ProjectSwisscows AG

Customer experience

OONI Probe

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

Swisscows Email

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

OONI Probe

No in-app purchases

6 purchases

Swisscows Email

Subscriptions6
  • Swisscows.email Basic Monthly$4.991 Month
  • Swisscows.email Standard Month$11.991 Month
  • Swisscows.email Premium Month$19.991 Month
Show 3 more
  • Swisscows.email Basic Year$49.991 Year
  • Swisscows.email Standard Year$99.991 Year
  • Swisscows.email Premium$179.991 Year

Questions

Is OONI Probe free?
OONI Probe is free to download, with no in-app purchases.
Is Swisscows Email free?
Swisscows Email is free to download, with in-app purchases available.
Which has better reviews, OONI Probe or Swisscows Email?
OONI Probe is rated higher. OONI Probe averages 4.5 out of 5 from 91 ratings, while Swisscows Email averages 3.0 from 4 ratings.
Do OONI Probe or Swisscows Email have ads?
Neither OONI Probe nor Swisscows Email shows ads.
Which is updated more often, OONI Probe or Swisscows Email?
OONI Probe ships an update every 2 months, and Swisscows Email every 3 weeks. Most recently, OONI Probe was updated on October 26, 2026 and Swisscows Email on October 24, 2026.

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