Passwordless is sold as the future of auth. Sometimes it is; often it’s overkill or ill-suited to the use case. Here’s a frame for deciding.
The three passwordless flavors
Before we evaluate, let’s name them:
- Magic links: email with a one-time URL. User clicks, they’re in.
- One-time codes: email or SMS with a 6-digit code. User types it back.
- Passkeys (WebAuthn): device-bound cryptographic credential. No network round-trip to a server besides the usual auth flow.
Each has different properties. “Passwordless” by itself isn’t precise.
B2C consumer apps: yes, usually
For consumer apps where users return weekly or monthly, passwords are a source of support burden. Password resets are the #1 support category for most B2C. Going passwordless:
- Magic links for occasional users: they don’t need to remember anything; the link in their inbox is the credential.
- Passkeys for frequent users: biometric unlock on their phone is faster than any password.
Conversion data from teams that have switched: 10-25% lower bounce on signup, 40-60% reduction in password-reset tickets. The case is strong.
Internal tools: usually overkill
For internal tools (company dashboards, admin panels) where the user is an employee signing in daily from a managed laptop, SSO via your corporate IdP (Google Workspace, Microsoft Entra) is the right answer. That is passwordless from the user’s perspective — they sign in to their OS, and the app picks up the session.
Adding magic-link or passkey support on top of SSO is redundant for this use case.
B2B SaaS: hybrid
This is the interesting case. Your users are a mix:
- Admins who sign in daily: want the fastest possible sign-in. Passkeys.
- Occasional collaborators invited to a workspace: magic links shine here. They get an invite email; the same link is the sign-in.
- Enterprise customers: will use SSO via their IdP. Your passwordless story here is “we support SSO,” not “we support magic links.”
The right B2B SaaS auth is:
- SSO for enterprise
- Magic links as the default for individuals
- Passwords as an opt-in for users who prefer them (usually devs on command-line tools)
- Passkeys as an additional credential for daily users
Don’t go “all passwordless” in B2B. Let users pick what fits.
When passwordless fails
Deliverability matters. If your magic links go to spam, or your transactional email is unreliable, users can’t sign in. That’s worse than a password reset — at least a reset can be retried.
Device loss hurts. Passkeys are device-bound by default. If the user loses their phone and hasn’t set up recovery, they’re locked out. Recovery flows for passkey-only users are harder than for password users.
Multi-device sync is inconsistent. Passkey syncing across devices depends on the platform (Apple’s iCloud Keychain, Google Password Manager, 1Password, etc.). Coverage isn’t universal.
The practical recommendation
- B2C, users return less than weekly → passwordless by default (magic links).
- B2C, users return daily → add passkeys.
- Internal tools → SSO, don’t reinvent.
- B2B SaaS → hybrid: SSO, magic links, optional passwords, passkeys on top.
Don’t pick passwordless because it’s trendy. Pick it because the specific user experience matches the specific user need. The reason it’s gaining ground is that for a lot of consumer products, that match is excellent. For your product, do the math.