I can't seem to find a good overview of the current state of Solidity fuzzers and don't know which ones might be considered old at the time of writing. I have been looking into echidna and foundry. The Solidity docs also mention SMTChecker. I would be grateful for any additional information/experiences with these libraries.

1 Answer 1


tl;dr hevm, Echidna, Harvey, Foundry

I keep a list of formal verification tools, and recently separated tools by fuzzers as well: https://github.com/leonardoalt/ethereum_formal_verification_overview (need to update with Foundry)

SMTChecker is a model checker based on Horn solvers, it overlaps with fuzzers in what it can achieve, but both have different and complementary pros and cons.

  • Amazing, thanks. Is there any that you'd personally recommend to someone starting out with formal verification?
    – phaze
    Feb 3, 2022 at 13:01
  • In general (not only fuzzers or fv): Slither, Echidna, Act, hevm/dapptools, Foundry fuzzer, Scribble, SMTChecker. A few others are not open access. Feb 8, 2022 at 19:19

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