Rethink: DNS + Firewall + VPN

In-app purchases
3.71K reviews
Content rating
PEGI 3
1M+
Downloads
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About this app

Say hello to a safer, transparent, and secure Android.

VPN: Connects to multiple WireGuard VPNs of your choice.

Safe: Reveals network activity of installed apps and lets you disable, uninstall, or firewall them.

Secure: First line of defense against spyware, ransomware, and malware that steal personal information and takeover accounts. Protects from DNS manipulation typically employed to censor websites, social media, and messaging apps.

Fast: DNS Servers deployed to 300+ locations world-wide to ensure your internet is as fast and highly available as it can be.

Open: Open source and free of any trackers.

***Features***

Firewall: Prevent apps from connecting to the Internet. Block spyware, malware, ransomware and more.

A firewall blocks any app connecting to the Internet over WiFi or Mobile data. Since most forms of surveillance require the data to be sent the network to a server, firewalling them effectively mitigates the threat (File Managers, Alarm Clock, Calculator are few such examples of apps that do not require any Internet access to function). The firewall feature uses Accessibility Service to detect and firewall background applications.

Monitoring: Keep tabs on incoming and outgoing Internet traffic.

If enabled, the connectivity logs are collected and analyzed. Automated reports flag previously unknown or suspicious connections, and reveal the extent of attempt to steal data by spyware networks. In our tests, around 60% of the traffic is flagged and reported as being initiated by known spyware. Logs generated are made available in near-real time to the user for their own analysis.

WireGuard: Secure outgoing Internet traffic.

The app uses fast, modern, light-weight, and secure WireGuard protocol to encrypt outgoing connections to any compatible VPN provider of your choice.

Anti-censorship:

The app encrypts your internet connection to Domain Name System (DNS) server run by Rethink with presence in our 300+ locations world-wide. DNS servers are the address book of the internet: A DNS server provides the exact addresses you need to visit a website or open an app.

Data Monitor: Track per-app and per-connection Mobile or WiFi data usage.
Firewall apps, use WireGuard VPN, monitor network, block malware, change DNS.
Updated on
24 Oct 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection
  • Committed to follow the Play Families policy

Ratings and reviews

3.57K reviews
Daniel
10 September 2026
So far, good impression in first install. I will further test it. It looks good for a free open source app. Minus one star for bug, and no option to add other sources. Please add feature where we can see which is blocking something so we can easily adjust our list. They removed the advertised VPN so it's now only DNS and Firewall. Filter lists appear to be nerfed instead of the original complete source so I'm using AdAway instead. Adult blocklists not working.
12 people found this review helpful
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Emmanuel
26 August 2026
Hello Developer. Please, is there any process or UID named "unknown" that connects to different IP in Rethink app logs? Please reply me. I want to know if I've got a deep hardware compromise. I have flashed my phone several times but this app named "unknown" keeps connecting to IP's mostly from my chrome browser, and its not even an app that I can uninstall.
3 people found this review helpful
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Celzero
26 August 2026
Hello, thanks for reaching out. “Unknown” in Rethink doesn’t necessarily mean a malicious app. Sometimes Android doesn’t provide app details when Rethink tries to identify the app behind a network connection. In such cases, Rethink may show it as “Unknown.” Seeing “Unknown” alone does not mean your device has been compromised.
Michael Billings sync (MJB)
16 October 2026
complicated now, it is ridiculous. People just want a 4 in 1 I can't even find out where to block ads anymore. Your first generation, that was good. just Support zip. & opvn and online lists. Three modes go through you monthly fee through you out and out purchase! Use whatever they want. 1 VPN to home. Like Wireguard or Nippard. 2 VPN that they've probably paid for like private internet access. 3 an easy to use add blocker 4 telling basic offline apps to be off
1 person found this review helpful
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Celzero
17 October 2026
We are sorry that the latest version has made things more complicated. We understand your frustration, and we appreciate your detailed feedback. Will take it into consideration as we continue improving the app. You can also share your feedback with us at hello@celzero.com.

What's new

UI: A new, re-designed homescreen.
UI: Re-designed all RPN screens, including country selection, connection stats, and multi-hop setup.
New: Allowed / blocked domain & IP stats grouped by app and time.
New: Universal trust / allow rules for domains and IPs.
New: 3 new Smart DNS preset filters: Privacy, Security, and Family.
Fix: Re-enforce trust/allowed Universal (global) domain and IP rules.
Improvement: UI changes to accommodate Foldables.