1
Sherlock
sherlock.xyzAlso covers security and security tools · same kind of website
Sherlock offers Web3 security audits, contests, AI analysis, and bug bounties for smart contract projects.
Alternatives
The Best Ethernaut Alternatives in 2026
24 alternatives0 free · 5 open source
Looking for something like Ethernaut? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 5 are open source.
Each Ethernaut level requires hacking a smart contract in the Ethereum Virtual Machine through a Web3 and Solidity wargame.
Top picks at a glance
First suggestionSherlockSherlock offers Web3 security audits, contests, AI…Open source optionEchidnaEthereum smart contracts can be fuzzed with Echidna, whose…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Sherlock | — | Not stated | Web |
| 2 | Echidna | — | Yes | — |
| 3 | Nexus Mutual | — | Not stated | Web |
| 4 | Sigma Prime | — | Not stated | Web |
| 5 | Immunefi | — | Not stated | Web |
| 6 | Hexens | — | Not stated | Web |
| 7 | HAPI ID | — | Not stated | Web |
| 8 | Hats Finance | — | Not stated | Web |
| 9 | Instadapp | — | Not stated | Web |
| 10 | EverRise | — | Not stated | Web |
All Ethernaut alternatives
2
Also covers security and security tools · open source
Ethereum smart contracts can be fuzzed with Echidna, whose repository describes it as a fuzzer.
3
Nexus Mutual
nexusmutual.ioAlso covers security and security tools · same kind of website
Nexus Mutual offers crypto cover for risks including hacks and describes itself as an alternative to insurance.
4
Sigma Prime
sigmaprime.ioAlso covers security and security tools · same kind of website
Sigma Prime audits smart contracts, zero-knowledge systems, blockchain infrastructure, and off-chain code, and publishes security research.
5
Immunefi
immunefi.comAlso covers security and security tools · same kind of website
Immunefi connects crypto projects with security researchers through smart contract and crypto bug bounty programs.
6
Hexens
hexens.ioAlso covers security and security tools · same kind of website
Hexens audits blockchain systems and offers continuous threat exposure monitoring, alongside research on smart contract platform vulnerabilities.
7
HAPI ID
hapi.oneAlso covers security and security tools · same kind of website
HAPI uses cross-chain smart contracts to add security functions to decentralized finance products.
8
Hats Finance
hats.financeAlso covers security and security tools · same kind of website
Hats Finance runs a decentralized marketplace for smart contract bug bounties and audit competitions.
9
Instadapp
instadapp.ioAlso covers security and security tools · same kind of website
InstaDapp develops DeFi tools, including the Fluid protocol and Avocado wallet for account and smart contract transactions.
10
EverRise
everrise.comAlso covers security and security tools · same kind of website
EverRise develops bridging and security applications for DeFi protocols across BNB Chain, Ethereum, Polygon, Fantom, and Avalanche.
11
Anvil
book.getfoundry.sh/anvilAlso covers security and security tools · same kind of website
Anvil runs a local Ethereum node for development and testing, with in-memory execution, funded accounts, instant mining, and chain forking.
12
Revoke
revoke.cashAlso covers security and security tools · same kind of website
Revoke.cash helps inspect and remove token approvals and wallet permissions across Ethereum and more than 100 networks.
13
Three Sigma
threesigma.xyzAlso covers security and security tools · same kind of website
Three Sigma audits blockchain code and DeFi systems, reporting security findings and services for Web3 projects.
14
RockawayX
rockawayx.comAlso covers security and security tools · same kind of website
RockawayX invests in Web3 ventures and provides blockchain infrastructure, liquidity, and engineering support for protocols and founders.
15
Also covers security and security tools · open source
OpenZeppelin Contracts provides a library for secure smart contract development.
16
Also covers security and security tools · open source
Scribble instruments Solidity code for runtime verification and property-based testing.
17
Also covers security and security tools · open source
VSCode Solidity Auditor adds Solidity language support and visual security auditing to Visual Studio Code.
18
Also covers security and security tools · open source
eth-tester provides a suite of tools for testing Ethereum applications, according to its repository description.
19
OpenZeppelin Defender
docs.openzeppelin.com/defenderAlso covers security and security tools · same kind of website
OpenZeppelin Defender is documented within the official OpenZeppelin library and tools documentation.
20
Tulipa Capital
tulipa.capitalAlso covers security and security tools · same kind of website
Tulipa Capital curates DeFi risk strategies and provides dashboards and partner information for its on-chain finance work.
21
3F Mutual
3fmutual.comAlso covers security and security tools · same kind of website
3F Mutual offers insurance related to a MakerDAO emergency shutdown, according to its page.
22
rekt
rekt.news/leaderboardAlso covers security and security tools · same kind of website
Rekt publishes investigative journalism and commentary on crypto incidents, with a ranked archive of major blockchain losses.
23
AlphaPing
alphaping.chAlso covers security and security tools · same kind of website
AlphaPing operates non-custodial on-chain credit vaults with defined risk constraints, verifiable accounting, and liquidity rules.
24
B.Protocol Curator
dashboard.bprotocol.orgAlso covers security and security tools · same kind of website
B.Protocol Curator tracks data associated with B.Protocol's backstop pools for monitoring.
No alternatives match this filter.
Alternatives to similar tools
OpenZeppelin Defender24 alternativesNexus Mutual24 alternativesSigma Prime24 alternativesThree Sigma24 alternativesVSCode Solidity Auditor24 alternativesEth Tester24 alternatives
What is the best alternative to Ethernaut?
Based on features, tags and platforms, the closest alternatives to Ethernaut are Sherlock, Echidna, and Nexus Mutual.
Are there open-source alternatives to Ethernaut?
Yes: Echidna, OpenZeppelin, Scribble, and VSCode Solidity Auditor.
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