The Best Sigma Prime Alternatives in 2026

OtterSec audits blockchain systems, including layer-one networks, wallets, DeFi protocols, bridges, and related infrastructure.

Re7 Labs advises DeFi protocols and curates on-chain risk, using research and in-house tooling across digital asset ecosystems.

Three Sigma audits blockchain code and DeFi systems, reporting security findings and services for Web3 projects.

Hexens audits blockchain systems and offers continuous threat exposure monitoring, alongside research on smart contract platform vulnerabilities.

Trail of Bits publishes security reviews, research, open-source tools, and talks covering software, blockchains, and AI systems.

Sherlock offers Web3 security audits, contests, AI analysis, and bug bounties for smart contract projects.

FailSafe builds continuous security testing systems that probe applications, APIs, infrastructure, and AI systems for exploitable issues.

HAPI uses cross-chain smart contracts to add security functions to decentralized finance products.

DeFiSafety reviews process quality in decentralized finance and publishes its review criteria, documentation, and research resources.

Hats Finance runs a decentralized marketplace for smart contract bug bounties and audit competitions.

Immunefi connects crypto projects with security researchers through smart contract and crypto bug bounty programs.

Rekt publishes investigative journalism and commentary on crypto incidents, with a ranked archive of major blockchain losses.

VSCode Solidity Auditor adds Solidity language support and visual security auditing to Visual Studio Code.

RockawayX invests in Web3 ventures and provides blockchain infrastructure, liquidity, and engineering support for protocols and founders.

Zellic provides security assessments for emerging technologies, using offensive security research to identify software vulnerabilities.

Splunk for Blockchain helps monitor blockchain systems by collecting and analyzing onchain and offchain data.

Each Ethernaut level requires hacking a smart contract in the Ethereum Virtual Machine through a Web3 and Solidity wargame.

InstaDapp develops DeFi tools, including the Fluid protocol and Avocado wallet for account and smart contract transactions.

EverRise develops bridging and security applications for DeFi protocols across BNB Chain, Ethereum, Polygon, Fantom, and Avalanche.

BlockSec Phalcon detects blockchain attacks and sends alerts to protocols, liquidity providers, traders, chains, and exchanges.

StarkWare develops STARK proof technology for blockchain scalability, security, and privacy, with products including Starknet and StarkEx.

Tulipa Capital curates DeFi risk strategies and provides dashboards and partner information for its on-chain finance work.

AlphaPing operates non-custodial on-chain credit vaults with defined risk constraints, verifiable accounting, and liquidity rules.

Anvil runs a local Ethereum node for development and testing, with in-memory execution, funded accounts, instant mining, and chain forking.