Zellic has become one of the most respected names in zero-knowledge circuit auditing and high-assurance cryptographic security. They're also one of the most selective audit firms in the space — and one of the most expensive. Here's the honest picture on who should actually be on their waitlist.
| Feature | Zellic | SmartContractAuditor.ai |
|---|---|---|
| Starting price | Undisclosed (high) | Free |
| Time to first result | Months (waitlist) | < 60 seconds |
| Standard Solidity auditing | ✓ Available | ✓ Automated |
| ZK circuit auditing | ✓ Best-in-class | Not available |
| Cryptography research | ✓ Specialty | Not available |
| Access control analysis | ✓ Manual | ✓ Automated |
| Re-audit after changes | Paid separately | Included |
| Availability for new clients | Selective / waitlist | Instant |
Zellic Cost
Undisclosed — selective engagements ($30k–$100k+ estimated)
Zellic Timeline
4 – 12 weeks (plus waitlist)
AI Audit Cost
Free – $100/mo
AI Audit Timeline
< 60 seconds
Zellic's reputation is built on two things that most audit firms can't match: zero-knowledge circuit auditing and deep cryptographic security research. When Aztec Network, StarkWare, or a team building a custom ZK proving system needs a security review, Zellic is one of a handful of firms with the cryptography expertise to audit the math — not just the implementation.
That specialization matters enormously for projects where the security boundary is a ZK proof system or a cryptographic primitive. The Wormhole exploit ($320M, February 2022) wasn't a ZK issue, but the class of vulnerabilities that could break a proving system — soundness bugs, information leakage in commitments — requires the exact kind of formal reasoning Zellic's team provides.
If you're building a DeFi protocol on Ethereum, a governance system, an NFT collection, a staking contract, or even a complex AMM — you don't need ZK circuit auditing. You need systematic Solidity vulnerability analysis.
The exploits that cause real losses in this category:
AI-powered analysis catches all of these. Waiting 3 months for Zellic to review your ERC-20 token contract is the wrong allocation of both time and money.
One clear question: does your protocol's security model depend on the correctness of a cryptographic proof system or a ZK circuit?
If no — use AI-powered auditing for development, and a manual audit firm (CertiK, Hacken, Trail of Bits) for pre-launch review. Zellic is not the right fit.
If yes — you're building a ZK rollup, a privacy protocol with custom circuits, or a proving system — then Zellic's waitlist is worth it, but you should still be running automated analysis in parallel during development. Getting accepted by Zellic doesn't mean you stop scanning for reentrancy.