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Android Apps > Tools > Rethink: DNS + Firewall + VPN
Rethink: DNS + Firewall + VPN icon

Rethink: DNS + Firewall + VPN

by Celzero · Tools · Free
On Google Play since April 2021 · Data updated 2026-10-16
Google Play

Rethink: DNS + Firewall + VPN is made and published by Celzero. AppBrain is an independent app data site and isn't affiliated with Celzero. The app name, icon, screenshots and description belong to Celzero and are shown as published on Google Play.

AppBrain's verdict

Popular
Rating on Google Play
3.89
3,445 ratings
Installs
1.1 million
Last updated
October 13, 2026
Ads
No ads
Size
72.5 MB

Rethink: DNS + Firewall + VPN is popular, with 1.1 million installs. Users are divided: 3.9 stars from 3,445 ratings.

Summary

Rethink: DNS + Firewall + VPN combines network security, DNS control, and WireGuard VPN in one open-source tool. It highlights real-time traffic monitoring and anti-censorship through global DNS locations. With 1,000,000+ total downloads and 41K in the last 30 days, the app carries a rating of 3.89 from 3,445 users.

Pros & Cons

  • Comprehensive security suite: firewall, monitoring, DNS, and anti-censorship
  • WireGuard-based VPN for fast, secure connections
  • Open source and free of trackers for transparency and trust
  • Global reach with 300+ DNS locations for fast, reliable access
  • Requires a broad set of permissions including location and foreground service
  • Firewall relies on Accessibility Service, which may raise accessibility concerns
  • Some privacy-focused rivals may offer deeper privacy controls not highlighted here

User feedback

Ratings and reviews on Google Play

Comments on Rethink: DNS + Firewall + VPN for Android

★★★★★ Keith White · Aug 4, 2026
Rethink: DNS + Firewall + VPN still works in 2026 impressed.
★★★★★ Chris Ward · Jul 24, 2026
This app has got my back .the only app to combat the"Ivan the terrible firebase remote config from the malious developer causing great harm impairment. As the malious Developer co-opts every legitimate potential dangerous API, this app aggregates the developer consequently developer named an IRQ conflict as "Rethinking Blacklist ".txt Justice is served via Google backed MALIOUS developer! When is the 3-year ending career criminal?
★★★★★ D. “Xerixs” Sam · Sep 20, 2026
This app is amazing for reclaiming control over Android's increasingly closed ecosystem, especially if you need to use an uprooted phone. It lets you control network activity for all your apps. While it is not perfect, it doesn't need to be. The features it provides (e.g. DNS management, IP blocking, a firewall, and proxy support) are more than enough for most general safety and privacy use cases. Honestly, these kinds of functionalities should be a native part of the basic Android OS.
★☆☆☆☆ StG · Sep 29, 2026
Best firewall I have found. Very flexible, blocks anything, allows local discovery of upnp devices. However, install it from GitHub or F-Droid. The Play Store version is outdated. And because it wants to update over the newer F-Droid version, I give it a 1-star rating.
★★☆☆☆ Daniel · Sep 10, 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 Ad Away instead. Adult blacklists not working.
★★☆☆☆ Sharnali Haque · Jul 18, 2026
Actually, after the latest update, you have a problem. If you block WhatsApp, it opens automatically. No one should install this app. I uninstalled it. 🤬
★★☆☆☆ Asuva Abdulqudus · Sep 29, 2026
It could have been the best app so far it doesn't slow network like others, but it doesn't block adult content at all like the Cloudflare does but Cloudflare slow network.... try upgrade it to block all adults sites completely

Google Play Rating history and histogram

2.1K
270
200
300
540

Store listing

By Celzero, from Google Play

“Firewall apps, use WireGuard VPN, monitor network, block malware, change DNS.”

Rethink: DNS + Firewall + VPN Screenshot 1 of 9
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Rethink: DNS + Firewall + VPN Screenshot 9 of 9
Screenshots by Celzero, from the Google Play listing
Description by Celzero Written by the developer, not by AppBrain. Click to read.
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.

Recent changes:
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.
Official page on Google Play

Safety and technology

Found in the app by AppBrain
Ads
No ads
Price
Free
Libraries
41
App size
72.5 MB
Needs Android
6.0+
Content rating
Everyone

Technologies used by Rethink: DNS + Firewall + VPN

22 permissions · 41 libraries
Subscribe to see full permission and library details
Trust & Safety: Rethink requests a broad permission set including location, local network access, foreground service, and notification access to support its firewall, monitoring, and DNS features. Review each permission's rationale and disable unused features to minimize risk.

Releases

Updates seen on Google Play
Version
v0.5.8
Launched
April 2021
  • Oct 13, 2026UpdateVersion v0.5.8
  • Aug 9, 2026UpdateVersion v0.5.6
  • Apr 17, 2026Installs1,000,000+ installs
  • Dec 2, 2024Installs500,000+ installs
  • Apr 6, 2024UpdateVersion v0.5.5e
Show all changes Show fewer

Alternatives

Similar apps and more from Celzero

Alternatives to Rethink: DNS + Firewall + VPN

Firewall - DNS & Anti Spy icon Firewall - DNS & Anti Spy
MadMax Apps
3.6
Free
100,000+
DNS Firewall by KeepSolid icon DNS Firewall by KeepSolid
KeepSolid Inc
3.8
Free
50,000+
InternetGuard no root Firewall icon InternetGuard no root Firewall
Nasrat Holding Group
4.2
Free
50,000+
DataGuard No Root Firewall, In icon DataGuard No Root Firewall, In
Browser by Fulldive Co.
4.4
Free
100,000+
Firewall Security AI - No Root icon Firewall Security AI - No Root
Protectstar Inc.
4.1
Free
500,000+
DNS Changer - Better Internet icon DNS Changer - Better Internet
The Simple Apps
4.0
Free
100,000+
AdWall X - Ad Blocker icon AdWall X - Ad Blocker
Osman Demir
3.9
Free
5,000+
InternetGuard No Root Firewall icon InternetGuard No Root Firewall
SheikhSoft
4.1
Free
5,000,000+

Installs

Tracked by AppBrain
Last 30 days
41 thousand
Per day
1.4 thousand
30-day average
Play install range
1+ million
Launched
April 2021

Installs over time

Rethink: DNS + Firewall + VPN has been installed 1.1 million times. Over the past 30 days, it averaged 1.4 thousand installs per day.

Rankings

Google Play top charts

Google Play Rankings for Rethink: DNS + Firewall + VPN

This app is not ranked

About the app and developer

About Rethink: DNS + Firewall + VPN

Rethink: DNS + Firewall + VPN is a tools app developed by Celzero.

Install Statistics

Rethink: DNS + Firewall + VPN has been installed 1.1 million times. In the last 30 days, the app was installed 41 thousand times.

User Ratings

Rethink: DNS + Firewall + VPN is rated 3.89 out of 5 stars. The rating is based on 3.4 thousand ratings.

App Information

Rethink: DNS + Firewall + VPN is freely available from Google Play. The app size is 72.47 MB. The latest version available is v0.5.8. The last update was on October 13, 2026.

Technical Requirements

Rethink: DNS + Firewall + VPN requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since April 2021.

App Performance Report

Get a detailed PDF report for Rethink: DNS + Firewall + VPN with download trends, rating history, and key performance statistics — useful for competitive research or tracking your own app. Learn more

Get PDF Report — $29

Developer information for Celzero

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Share Rethink: DNS + Firewall + VPN

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