Staxly

Postmark vs Stytch

Reliable transactional email with fast delivery
vs. Authentication platform for B2C and B2B

Postmark website ↗Stytch website ↗

Pricing tiers

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
Postmark website ↗

Stytch

Free
10,000 MAU. Unlimited orgs. 5 SSO/SCIM connections. 1,000 M2M tokens. 10,000 fraud fingerprints. Full auth suite.
Free
Pay as you go
Usage-based after free allowances. Volume discounts for high MAU.
$0 base (usage-based)
Enterprise
Custom. 99.99% SLA, private Slack, migration assistance, HIPAA/BAA.
Custom
Stytch website ↗

Free-tier quotas head-to-head

Comparing free on Postmark vs free on Stytch.

MetricPostmarkStytch
fraud fingerprints included—10000 fingerprints/month
m2m tokens included—1000 tokens
mau included—10000 users/month
organizations—unlimited orgs
sso connections included—5 conns

Features

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.

Stytch · 15 features

  • B2B Auth — Multi-tenant auth: organizations, roles, JIT provisioning, enterprise SSO, SCIM.
  • B2C Auth — Consumer auth: passwordless (magic links, OTP), passwords, OAuth, passkeys, WebA…
  • Device Fingerprinting — Fingerprint devices at signup/login. Block bots, credential stuffing, and ATO at…
  • Device-Fingerprint Risk API — Real-time risk scoring API usable even without full auth.
  • Enterprise SSO (OIDC) — OIDC SSO per organization.
  • Enterprise SSO (SAML) — SAML 2.0 SSO per organization. Self-serve admin portal.
  • JIT Provisioning — Auto-create users in an org on first SSO sign-in.
  • Machine-to-Machine — Client-credentials OAuth for service-to-service.
  • OAuth / Social — Google, Apple, Microsoft, GitHub, Slack, Discord, Facebook, LinkedIn, Amazon, Bi…
  • Organizations — Multi-tenant primitive with policies per org.
  • Passkeys (WebAuthn) — FIDO2 passkey enrollment and authentication.
  • Passwordless — Magic links (email) + OTP (email/SMS/WhatsApp) + embeddable magic links.
  • RBAC — Roles and permissions per organization (B2B).
  • SCIM Provisioning — Directory user/group provisioning from Okta, Azure, Google Workspace.
  • Sessions — JWT or opaque session tokens. Configurable lifetime.

Developer interfaces

KindPostmarkStytch
SDKpostmark-dotnet, postmarker (Python), postmark-go, postmark (Node), postmark-php, postmark-railsAndroid SDK, Go backend SDK, iOS SDK, Java backend SDK, JavaScript SDK, Next.js SDK, Node backend SDK, Python backend SDK, React SDK, Ruby backend SDK
RESTPostmark REST APIB2B API, B2C API
OTHERInbound Email, SMTP Relay, Webhooks—
Staxly is an independent catalog of developer platforms. Outbound links to Postmark and Stytch are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.

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