Railgun vs Zama: privacy design and access (2026)

Railgun and Zama both aim to limit what the public can see on-chain, but they use different techniques. Railgun uses zk-SNARK proofs to enable private transactions and contract interactions. It is infrastructure rather than a standalone app, so users access it through third-party wallets and front ends. Zama uses fully homomorphic encryption to keep token amounts and balances encrypted while enabling confidential tokens, vaults and swaps.

That distinction affects who each product suits. Railgun is a fit for users who want privacy for ordinary transactions or DeFi interactions across several EVM networks. Zama’s named products and use cases focus more on confidential financial activity, including institutional applications. Its token standard, SDK and developer documentation also make it relevant to teams building confidential apps. Confidentiality does not mean guaranteed anonymity, and users should consider how each system’s design aligns with their needs.

Railgun is deployed on Ethereum, Arbitrum, Polygon and BNB Chain. It is described as running directly as smart contracts, without a bridge or layer-2. Its four-network coverage makes it the broader choice for users who need to work across those EVM networks, though it does not cover every chain.

Zama’s public deployments are on Ethereum. Its homepage says the protocol can run on any L1 or L2, but that is not the same as having public deployments across those networks. The active products described are on Ethereum, including confidential tokens, vaults and swaps. Choose based on the network you plan to use: Railgun offers more listed deployments today, while Zama’s published product examples are Ethereum-focused. Check the specific app or integration before moving funds, since access and supported features can depend on it.

Neither Railgun nor Zama publishes fees for shielding, unshielding, swaps or vault use. You should also account for network gas, which depends on the chain and transaction. Railgun’s costs may appear in the third-party wallet or app used to access it; Zama says product-level fees and gas costs are shown through its app and documentation. Confirm the actual transaction costs before proceeding rather than assuming one protocol is cheaper.

The products also differ in what they let users do. Railgun focuses on private transactions and DeFi interactions, with integrations determining the available experience. Zama describes confidential tokens, vault deposits and swaps, where balances or transaction details remain encrypted. Encrypted computation can carry costs beyond ordinary transfers, but Zama has not published figures for those costs. Compare the specific action and interface you intend to use, not just the protocol names.

Railgun has two audits listed, but the auditor names, dates and findings are not public. Zama lists no audits, and public audit reports are not available. This is a meaningful difference in what is disclosed, not proof that either protocol is free of risk. Both involve smart contracts; Railgun also carries zero-knowledge circuit risk, while Zama’s FHE approach is newer and less battle-tested than standard smart contracts.

Railgun describes itself as non-custodial, which means users hold their own keys and may be unable to recover access if they lose them. Zama’s products also involve depositing tokens into contracts, so contract risk applies. For either protocol, review any security information before depositing funds and consider whether you can tolerate a loss. Privacy features do not remove technical or operational risk.

Choose Railgun if you want zk-SNARK-based privacy across Ethereum, Arbitrum, Polygon or BNB Chain, and you are comfortable using a third-party app rather than a first-party product. Its non-custodial design and lack of a required bridge or layer-2 may also matter to your decision. Its access and user experience will depend on the integration you choose.

Choose Zama if you are looking for confidential tokens, vaults or swaps on Ethereum, or if you are a developer interested in its ERC-7984 standard, SDK and documentation. Its institutional use cases and compliance-oriented approach may suit users who need confidentiality alongside verifiability, rather than full anonymity. Zama has no audits listed, while Railgun has two with details not public; neither publishes fees. Check local regulations before using privacy tools, and do not treat encrypted activity as a guarantee of anonymity.