OONI Probe vs Tella
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Tella
Securely store and organize your photos, videos, and audio recordings within an encrypted vault. Capture content directly inside the app to ensure its privacy and protection.
- Encrypted file storage
- Folder organization
- In-app camera
- In-app video recording
- In-app audio recording
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- Encryption: keep your files safe and secure inside Tella's encrypted vault- File management: organize your files into folders - Camera: take photos and videos directly inside of Tella's encrypted vault - Recorder: record audio directly inside of Tella's encrypted vault
Screenshots
Verdict
The clearest difference is review sentiment: OONI Probe at 58% against Tella's 0%. OONI Probe also leads on rating (4.5 vs 3.8) and ratings volume (91 vs 4). On price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OONI Probe holds the better App Store score, 4.5 against 3.8. 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 point the same way: 58% of OONI Probe's written reviews are positive against 0% of Tella's.
OONI Probe ships an update every 2 months, Tella every 6 weeks. Both last shipped on October 24, 2026.
| Parameter | OONI Probe | Tella |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (91 ratings) — better | 3.8 (4 ratings) |
| Positive reviews | 58.1% of reviews — better | 0.0% of reviews |
| Number of ratings | 91 — better | 4 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 139 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | The Tor Project | Horizontal |
Customer experience
OONI Probe
Tella
In-app purchases
OONI Probe
No in-app purchases
Tella
No in-app purchases
