Steam authenticator alternatives to SDA, compared
Three realistic options, and the honest case for each — including the one where the answer is not us. We would rather you chose correctly than chose ours.
Steam Mobile — the default, and the right answer for most people#
Valve's own app. It is maintained by the people who run the service, it comes from the stores linked by Valve's mobile page. Keeping the authenticator on a separate phone reduces the chance that malware on the trading PC compromises both factors. Phone loss is recoverable when you retain a recovery route; plan that before changing devices.
Choose it if: you are not confirming listings in bulk, you are not sure what a maFile is, or you would rather not be responsible for storing a maFile. It is our recommended default; you still need to secure the phone, review approvals and preserve recovery access.
Trade-offs: using a separate device can interrupt a desktop workflow. The app supports QR sign-in and approval prompts as well as generated codes, so manual retyping is optional. A lost or broken phone still requires the recovery preparations described above.
Steam Desktop Authenticator — no longer supported#
The original SDA is a longstanding community desktop implementation. Its README says it is no longer supported, will receive no more updates, and recommends Steam's official mobile app.
If you already use it: back up the maFiles, matching manifest and passphrase, preserve recovery access, and plan a move to a supported option. The original repository remains the reference for identifying genuine SDA; we do not recommend starting with unsupported software.
Against it: there is no promised maintenance when Steam or security requirements change. The project's own warning about counterfeit downloads adds a separate acquisition risk.
Open Desktop Authenticator — this project#
An independent implementation published by the team writing this comparison. Public source, builds in public CI, no updater inside ODA, and a documented security model that includes what it cannot protect you from. Every release publishes checksums and build provenance. Two things are not yet done: reproducible builds you could compare byte for byte and an independent audit — the download page says where each one stands.
Choose it if: you want a desktop authenticator and you want to be able to check what it does — or have somebody else check.
Against it, plainly: it is new. Version 1.0 was published on 25 August 2026, with no years of community scrutiny behind it and no track record comparable to a mature project. Source availability and provenance do not substitute for an independent security audit. Desktop custody puts the second factor on the same computer you may use to trade; use Valve's mobile app if you do not need that trade-off.
The comparison that actually matters#
Not the feature list — the failure modes. Ask of any authenticator, including ours:
- Can I verify that what I ran is what was published?
- Where does the secret live, and who else can read it?
- What happens when I lose the device? Answer that before you need it.
- Who controls updates, and how are they authenticated? Every update changes the code entrusted with the secret; delaying security fixes also carries risk.
- What can it approve without asking me?
A tool that answers those five well is a tool worth using, whoever wrote it.