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
Oct 24, 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
Michael Billings sync (MJB)
October 16, 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
October 17, 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.
Dominic Charlton
August 27, 2026
WARNING!! great app but one star for backup/restore feature that was broken, when restore to new phone before install etc apps, rule will apply to wrong app, dev never care about this for years.
7 people found this review helpful
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Mikhail Frantsyzof
September 2, 2026
Brilliant app. You can tell it was built by people who actually know what they're doing. If you want finer control than this, you're looking at iptables on a rooted Android - but that's a hassle. This just nails it.
14 people found this review helpful
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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.