Postmark vs Upstash
Reliable transactional email with fast delivery
vs. Serverless Redis + Kafka + Vector + QStash — per-request pricing
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
Upstash
Free
Redis: 256 MB + 500k cmds/mo. Vector: 10k queries/mo. QStash: 500 msgs/day.
Free
Pay-as-you-go
Redis: $0.2 per 100k cmds. Vector: $0.4/M queries. QStash: $1 per 100k.
$0 base (usage-based)
Fixed Plans
From $10/mo. 250MB-500GB Redis. $5/read region. 50GB bandwidth included.
$10/mo
Prod Pack
+$200/mo per DB. SLA + RBAC + encryption + SOC-2 + Prometheus + Datadog.
$200/mo
Enterprise
Custom. 100k+ cmd/sec, unlimited bandwidth, HIPAA.
Custom
Free-tier quotas head-to-head
Comparing free on Postmark vs free on Upstash.
| Metric | Postmark | Upstash |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
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.
Upstash · 12 features
- Cron (via QStash) — Scheduled HTTP callbacks on any interval.
- Edge-Ready — Native for CF Workers, Vercel Edge, Deno, Bun.
- Global Database — Multi-region Redis reads.
- HTTP REST APIs — Every product has REST — works from edge runtimes.
- QStash — HTTP-based message queue + cron scheduler for webhooks.
- QStash Webhooks — Outgoing webhook delivery with retries + DLQ.
- Read Regions — Add read replicas in any region ($5/mo each).
- @upstash/ratelimit — Redis-backed rate limiter lib.
- Upstash Redis — Serverless Redis with HTTP REST + RESP TCP.
- Upstash Search — Full-text + semantic search engine.
- Upstash Vector — Serverless vector DB with REST API. HNSW indexing.
- Upstash Workflow — Durable workflow runtime built on QStash.
Developer interfaces
| Kind | Postmark | Upstash |
|---|---|---|
| SDK | postmark-dotnet, postmarker (Python), postmark-go, postmark (Node), postmark-php, postmark-rails | upstash-redis / vector (Python), @upstash/redis / vector / qstash |
| REST | Postmark REST API | QStash REST API, Upstash Redis REST API, Upstash Vector REST |
| OTHER | Inbound Email, SMTP Relay, Webhooks | RESP (TCP) |
Staxly is an independent catalog of developer platforms. Outbound links to Postmark and Upstash are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
Want this comparison in your AI agent's context? Install the free Staxly MCP server.