Sui zkLogin vs Aptos Keyless Accounts: Which Onboarding Is Easier?
Onboarding new users remains the unsolved problem in crypto. Sui and Aptos both offer solutions that replace seed phrases with familiar Web2 logins. The approaches are conceptually similar. The tradeoffs in recovery, privacy, and wallet support differ in ways that matter for users and developers.
Sui calls its system zkLogin. Aptos calls its system Keyless Accounts. Both use zero-knowledge proofs to verify an OpenID Connect login - Google, Twitch, Apple - without posting the raw identity on the chain. The user authenticates with their Web2 provider. A zk-proof proves the authentication is valid. The on-chain address is derived deterministically from the provider and a user-specified salt, not from the provider's internal user ID.
Privacy is near-identical in theory. Neither system stores the user's email or provider identity on-chain. The on-chain address reveals nothing about which Web2 account controls it. An observer sees a standard address and valid transactions. They cannot learn your Google account from the chain data.
Recovery is where the two designs diverge.
Sui zkLogin ties the account to the identity provider plus a salt. If you lose access to your Google account, you cannot derive the zkLogin key again unless you have the salt backed up. Sui offers no built-in social recovery or backup key mechanism. Some wallets implement their own recovery layers, but the core protocol does not mandate one. If Google suspends your account, you lose the ability to generate new proofs. An attacker who compromises your Google account gains the ability to control the Sui address.
Aptos Keyless Accounts handle this differently. The account can be configured with a backup key or a recovery handle before a single transaction is sent. Keyless Accounts support optional key rotation and fallback keys from the first login. If the identity provider revokes access, the fallback key remains valid. The account survives even if your Google account is deleted.
This is not theoretical. Identity providers revoke accounts for policy violations, inactivity, or security suspicions. With Sui zkLogin, revocation of the source identity can permanently lock the on-chain address unless the user independently backed up the private key derived at account creation. With Aptos Keyless Accounts, the fallback key provides a path back in.
Wallet support reflects these differences. Sui zkLogin is implemented in several Sui wallets including Sui Wallet and Sui Bridge. The user flow is simple: click "Sign in with Google," approve the popup, and a Sui address is created instantly. The wallet handles the zk-proof generation on the client side. No browser extension is required if using a web wallet.
Aptos Keyless Accounts require wallet support that understands the OIDC flow and the zk-proof generation. Fewer wallets support Keyless Accounts at this point, though Martian and Petra have started adding it. The user experience is similar - a Web2 login button, a popup, and an instant account - but the list of compatible wallets is shorter.
Both systems depend on a zk-proof generation service running during the login. If that service is down, users cannot log in even with a valid Google account. This introduces a point of centralization that neither chain fully solves. The proof generation can be run by the user's own wallet software, but the default implementations use hosted services.
Which is easier depends on your priority.
For a user who wants to log in once and never think about key management again, Aptos Keyless Accounts offer stronger guarantees against account loss. The fallback key is an insurance policy that Sui zkLogin lacks by default.
For a user who wants maximum wallet support and a smoother initial setup, Sui zkLogin has broader adoption across wallets and a more mature integration ecosystem.
Both systems share the same fundamental tradeoff: you are trusting the identity provider not to lock you out. The zero-knowledge proof protects your privacy. It does not protect your control. Understanding that distinction is more important than memorizing the protocol name.
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