Osprey: Browser Protection
Free, open-source safe browsing extension that automatically blocks phishing, malware, scams, and dangerous websites.
10,000+ users protected
Partnered with
What Osprey does
Stops fake login pages
Blocks the counterfeit bank and email pages built to capture your password.
Stops viruses and scams
Dangerous downloads, fake stores, and fraud are stopped as soon as you visit them.
Up to 22 checks, not just one
Your browser checks with one threat list. Osprey checks up to 22 at once for every website you visit.
Cannot read your screen
Osprey has no permission to see the pages you look at, so we can't see your sensitive information.
No accounts required
You do not have to give your name or email address. Osprey works without any personal information.
Protects your privacy
Osprey does not collect your browsing history. Every link is checked privately and anonymously.
How it works
- 1
You click a link
Anywhere. An email, a search result, a message from a friend. Osprey checks if it's seen that link before. If it hasn't...
- 2
Osprey checks the address
Osprey's secure proxy server asks up to 22 different sources if the page is safe, and gets an answer in a fraction of a second.
- 3
You get a warning, or nothing at all
If the website is dangerous, Osprey stops it and shows a warning page. If it's safe, you see the page as normal.
How Osprey started
Osprey was created in October 2024 to end the need to install multiple safe-browsing extensions just to get adequate phishing protection. The protection built into most browsers isn't enough on its own anymore, and users shouldn't have to sacrifice their privacy or performance to stay safe online. Osprey is built to be extremely lightweight, privacy-preserving, and thorough, checking every website you visit against multiple threat intelligence sources, rather than relying on a single list.
The mission is simple: be the most trusted, transparent, and effective browser protection extension for home users and businesses, while staying free and open-source, forever. Osprey will never collect, profile, or sell your browsing data. Our development team (one extremely dedicated developer) works tirelessly to make that a reality. We're already partnered with leading cybersecurity companies and constantly push updates to keep up with the latest threats. We hope you enjoy using Osprey, and we welcome your feedback and contributions to make it even better.
How Osprey compares
| Feature | Osprey | Your browser alone | Malwarebytes | Bitdefender |
|---|---|---|---|---|
| Free, no accounts required | Yes | Yes | Yes | Yes |
| Checks more than one source | 22 sources | 1 source | 1 source | 1 source |
| Open-source and auditable | Yes | No | No | No |
| Strict no-logging policy | Yes | No | No | No |
| Configurable threat sources | Yes | No | Yes | No |
| Doesn't slow down browsing | Yes | Yes | No | No |
| Shows no adverts or upsells | Yes | Yes | No | Yes |
| Blocks >90% on OpenPhish | Yes | No | Yes | No |
| Blocks newly registered domains | Yes | No | No | No |
| Instant updates to threat sources | Yes | No | No | Yes |
Common questions
Will it slow my computer down?
No. Osprey is built to be as lightweight as possible. It doesn't stop pages from loading, and it checks every website in a fraction of a second. You won't notice any difference to your browsing speed.
Will it stop websites from working properly?
No. Osprey either lets a website through completely untouched, or it stops it and shows a warning. There is no in-between. It doesn't check page contents or modify anything, so it cannot break a website. It only blocks the whole page if it is dangerous.
What if it blocks a website I know is fine?
You can add the website to your list of exclusions, click through the 'Continue anyway' button, or turn off the protection provider that blocked it. You can also take some time to report it as a false positive. You are in control of your browsing experience.
Does it work in private or incognito windows?
Yes, if you switch it on for those windows. Your browser keeps that turned off by default for every add-on. Private windows stay completely separate from your normal browsing.
The report button opens a blank page. What do I do?
You might not have a default mailto: handler set up on your computer. Osprey uses mailto: links to create pre-written emails to threat intelligence providers. You can either set up a default mailto: handler, or copy the email address and paste it into your email program.
How is my privacy protected when it checks a website?
Osprey sends the URL of the page you are visiting to our private proxy server, which checks it against the threat intelligence providers. Since every provider only sees the proxy server's IP address, there's no way for them to know who you are or what you are looking at. Osprey does not log your browsing history, and the proxy server does not log your IP address.
Does it block ads on websites like AdBlock?
No. Osprey does not block ads. It only blocks websites that are dangerous, and it does not modify any page contents. You can keep your ad blocker installed alongside Osprey.
Will it cause issues with my antivirus or my ad blocker?
No. Osprey does a different job from both and is built to sit alongside them. Keep everything you already have. You do not need to turn anything off.
What does it keep on my computer?
Your settings, and a short-lived note of websites it recently checked so it does not have to ask twice. It all stays on your machine, and uninstalling Osprey removes it.
Can I turn one of the protection providers off?
Yes, any of them, whenever you like. Click the Osprey icon, choose Open Settings, and switch off the ones you do not want. Nothing is forced on you.
Can I use it at work, or install it across my company?
Yes. It is free for business use, and an IT administrator can install it across an organisation and lock the settings so nobody can switch protection off.
How can I deploy Osprey across an organization?
Osprey installs from the Chrome, Edge, and Firefox stores, so it can be pushed to managed browsers the same way as any other extension through your existing device management. Because it needs no account and no license keys, there is nothing to provision per user, and every provider is enabled by default. The source is public if your security team wants to review it before rolling it out.
Is anyone still working on it?
Yes. Osprey is updated regularly and every change is published publicly the day it is made. You can see the source code and the changelog on GitHub, and you can report bugs or request features there too.
Something not working?
Email support@osprey.ac or create an issue on GitHub.
We'll get back to you as soon as we can.