WorkOS vs Postmark
The modern identity platform for B2B SaaS
vs. Reliable transactional email with fast delivery
Pricing tiers
WorkOS
AuthKit Free
First 1M MAUs free. Unlimited organizations, user management, social OAuth, passwordless.
Free
AuthKit Scale
Per 1M additional MAUs.
$2500/mo
Enterprise / Annual Credits
Custom with 99.99% SLA, guided migration, dedicated support.
Custom
Postmark
Free
100 emails/month forever. No credit card. Side projects and testing.
Free
Basic — 10k
10,000 emails/month. Overage $1.80/1k. Unlimited emails/day.
$15/mo
Pro — 10k
10,000 emails/month. Overage $1.30/1k. Inbound email + message streams.
$17/mo
Platform — 10k
10,000 emails/month. Overage $1.20/1k. Team collab, more domains.
$18/mo
Enterprise (>1.5M)
Custom for senders exceeding 1.5M/month.
Custom
Free-tier quotas head-to-head
Comparing authkit-free on WorkOS vs free on Postmark.
| Metric | WorkOS | Postmark |
|---|---|---|
| mau included | 1000000 users/month | — |
| organizations | unlimited orgs | — |
| staging environments | free envs | — |
Features
WorkOS · 13 features
- Audit Logs — Standardized audit log pipeline with streaming to SIEMs (Splunk, Datadog, Sumo L…
- AuthKit — Complete drop-in user management UI + hosted auth flows. Built on top of WorkOS.
- Directory Sync — SCIM-based user provisioning/deprovisioning from Okta, Azure AD, Google Workspac…
- FGA (WorkOS) — Fine-grained authorization based on Google Zanzibar / OpenFGA.
- Magic Auth — Passwordless email codes + links. Good alternative to password auth for B2B.
- Multi-Factor Auth — TOTP + SMS MFA enrollment and verification APIs.
- Organizations — Multi-tenant B2B primitive. Attach SSO/Directory/Audit to specific customer orgs…
- Passkeys — WebAuthn passkeys as a first-class factor.
- Radar — Fraud protection: device fingerprinting + risk scoring at signup and login.
- Single Sign-On — Plug-and-play SAML 2.0 + OIDC SSO with 30+ identity providers pre-mapped.
- User Management — REST API + webhooks for user CRUD, email verification, sessions, MFA, metadata.
- Vault — Secret storage for tokens + per-tenant credentials.
- Widgets — Embeddable admin portals (SSO setup, directory mapping) that your customers self…
Postmark · 12 features
- Activity Search — Full-text search over sent messages for 45-365 days.
- Bounce Handling — Automatic hard/soft bounce detection + suppression management.
- Broadcast Messages — Via separate Broadcast Message Stream. Bulk sends with throttling.
- DKIM + SPF — One-click verification + auto-renewal of DKIM keys.
- Inbound Email — Route inbound emails to your webhook. Parse attachments, threads.
- Message Streams — Isolate transactional from marketing for separate deliverability reputation.
- Open + Click Tracking — Configurable at template or send level.
- Raw API Access — 100+ endpoints for bounces, servers, tags, templates, stats.
- Servers — Multi-tenant isolation: each "server" has its own API token + reputation.
- Templates — Mustachio template language with variables, alias + versioning.
- Transactional Send — Reliable API for password resets, receipts, notifications. Sub-10s delivery.
- Webhook Events — Delivery, bounce, spam complaint, open, click, subscription change.
Developer interfaces
| Kind | WorkOS | Postmark |
|---|---|---|
| SDK | workos-go, @workos-inc/authkit-nextjs, workos-java, workos-node, workos-php, workos-python, workos-ruby | postmark-dotnet, postmarker (Python), postmark-go, postmark (Node), postmark-php, postmark-rails |
| REST | WorkOS REST API | Postmark REST API |
| OTHER | Webhooks | Inbound Email, SMTP Relay, Webhooks |
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