1
APKTool
apktool.orgAlso covers engineering, security, and security tools · same kind of website
Inspect and reverse engineer Android application packages using the Apktool utility.
Alternatives
The Best challenges.re Alternatives in 2026
24 alternatives1 free · 5 open source
Looking for something like challenges.re? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 5 are open source.
About challenges.rechallenges.re
VisitSolve reverse engineering challenges published on challenges.re, a challenge-focused site.
Top picks at a glance
First suggestionAPKToolInspect and reverse engineer Android application packages…Free or freemium optionOTP AuthManage two-factor authentication codes with OTP Auth, an…Open source optionApktoolApktool reverse engineers Android APK files and provides a…Another optionRizinRizin supports analysis of executable programs through an…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | APKTool | — | Not stated | Android, Web |
| 2 | Rizin | — | Not stated | Web |
| 3 | Plugins | — | Not stated | Web |
| 4 | Apktool | — | Yes | Android |
| 5 | Awesome List | — | Not stated | — |
| 6 | Binary Ninja | — | Not stated | Linux, macOS, Web |
| 7 | mCaptcha | — | Not stated | Web |
| 8 | Flare VM | — | Yes | Windows |
| 9 | Radare2 | — | Not stated | — |
| 10 | GHIDRA | — | Yes | — |
All challenges.re alternatives
2
Rizin
rizin.reAlso covers engineering, security, and security tools · same kind of website
Rizin supports analysis of executable programs through an open source reverse engineering framework.
3
Plugins
plugins.hex-rays.comAlso covers engineering, security, and security tools · same kind of website
This directory lists plugins for IDA Pro that add functions for reverse engineering workflows.
4
Also covers engineering, security, and security tools · open source
Apktool reverse engineers Android APK files and provides a repository for the project.
5
Awesome List
github.com/0xor0ne/awesome-listAlso covers engineering, security, and security tools
Browse a cybersecurity-focused collection of links and resources in this repository.
6
Binary Ninja
binary.ninja/freeAlso covers security and security tools · same kind of website
Binary Ninja supports software reverse engineering and can be tried in a browser or installed as a desktop application.
7
mCaptcha
mcaptcha.orgAlso covers security and security tools · same kind of website
Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.
8
Also covers security and security tools · open source
Set up a Windows virtual machine for reverse engineering with FLARE-VM’s software installation scripts.
9
Radare2
github.com/radareorg/radare2Also covers security and security tools
Analyze and reverse engineer software with radare2, a Unix-like framework and command-line toolkit.
10
Also covers security and security tools · open source
Analyze software with Ghidra, a framework for reverse engineering compiled programs.
11
Also covers security and security tools · open source
AndroGuard provides tools for reverse engineering and penetration testing Android applications.
12
Also covers security and security tools · open source
Find community-provided plugins for the Binary Ninja reverse engineering platform.
13
Plugins
github.com/x64dbg/x64dbg/wiki/PluginsAlso covers security and security tools
Browse plugins for x64dbg, a Windows debugger used for reverse engineering and malware analysis.
14
Asymmetric Research
asymmetric.reAlso covers security and security tools · same kind of website
Asymmetric Research provides security partnerships for L1 and L2 blockchains and DeFi protocols, including engineering and threat-response work.
15
Also covers security and security tools · same kind of website · free plan
Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.
16
Also covers security and security tools · same kind of website
Generate secure SSL configurations for selected web, database, and mail software.
17
GoPlus Locker V3
gopluslabs.ioAlso covers security and security tools · same kind of website
GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.
18
NVD
nvd.nist.govAlso covers security and security tools · same kind of website
Search the National Vulnerability Database, a public resource for vulnerability information.
19
WhatsMyDNS
whatsmydns.netAlso covers security and security tools · same kind of website
WhatsMyDNS checks DNS record propagation across global resolvers for record types including A, AAAA, MX, and TXT.
20
tpscalls.live
tpscalls.liveAlso covers security and security tools · same kind of website
View Toronto Police calls for service on a map that updates in real time, according to the supplied page description.
21
Metasploit
metasploit.comAlso covers security and security tools · same kind of website
Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.
22
Synk
security.snyk.ioAlso covers security and security tools · same kind of website
The Snyk Security Database provides vulnerability details and remediation guidance for packages and cloud configurations.
23
URL Decoder/Encoder
meyerweb.com/eric/tools/dencoderAlso covers security and security tools · same kind of website
The URL Decoder and Encoder converts text between encoded and decoded forms, including JavaScript URLs.
24
Lucia
lucia-auth.comAlso covers security and security tools · same kind of website
Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.
No alternatives match this filter.
Alternatives to similar tools
OTP Auth24 alternativesMozilla SSL24 alternativesNVD24 alternativesRizin24 alternativesGoPlus Locker V324 alternativesWhatsMyDNS24 alternatives
TopicSecurity Tools · 202 sites Best-of list8 Best Free Authenticator Apps for Codes and Recovery Listingchallenges.re details
What is the best alternative to challenges.re?
Based on features, tags and platforms, the closest alternatives to challenges.re are APKTool, Rizin, and Plugins.
Is there a free alternative to challenges.re?
Yes. OTP Auth is free or offer a free plan.
Are there open-source alternatives to challenges.re?
Yes: Apktool, Flare VM, GHIDRA, and AndroGuard.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative