Postmark vs Stream
On the evidence we track, Stream leads this comparison with a composite score of 80/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
Capabilities
Feature-by-feature on the axes that matter for communication apis. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
Postmark
A transactional email platform that sends emails through API and SMTP endpoints, with built-in capabilities for tracking delivery success, handling bounces, and processing inbound messages. Designed for developers who need to integrate email delivery into applications.
Stream
LeaderA platform providing SDKs and APIs for adding chat messaging, video calling, activity feeds, and content moderation to applications, supporting billions of end users across a globally distributed infrastructure.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Postmark
From $15/mo. Free tier with 100 emails/month. Pay-as-you-go overages starting at $1.80 per 1,000 emails.
- FreeFree
- 100 emails/month
- REST API
- SMTP
- Transactional email
- Sandbox Mode
- +3 more
- Basic$15/mo + $1.80 per 1,000 overage emails
- 10,000+ emails/month
- Industry-leading deliverability
- 45-day retention
- 5 custom domains
- Unlimited emails/day
- +3 more
- Pro$16.50/mo + $1.30 per 1,000 overage emails
- 10,000+ emails/month
- Industry-leading deliverability
- Customizable retention up to 365 days
- 10 custom domains
- Unlimited emails/day
- +5 more
- Platform$18/mo + $1.20 per 1,000 overage emails
- 10,000+ emails/month
- Industry-leading deliverability
- Customizable retention up to 365 days
- Unlimited custom domains
- Unlimited emails/day
- +5 more
Stream
LeaderFree tier plus $499–$899/month plans with activity and API call overages. Free Maker program for companies under 5 team members and $10k MRR.
- FreeFree
- Flat & Timeline Feeds
- Notification & Aggregated Feeds
- Security & Compliance
- Global Edge Network
- Start$499/month billed annually, or $599/month
- All Feeds API features
- Ranked Feeds
- Ticketed Support
- Security & Compliance
- Global Edge Network
- Elevate$899/month billed annually, or $999/month
- All Feeds API features
- Ranked Feeds
- Ticketed Support
- Security & Compliance
- Global Edge Network
- EnterpriseContact sales
- Activity-based pricing
- 99.999% SLA
- SAML/SSO
- Private Dedicated Servers
- 24/7 Support
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
- Slack
Postmark
- Mailcoach
- Datadog
- Craft CMS
- Customer.io
- ActiveCampaign
- Supabase
- Bubble
- Figma
- Google Sheets
- Gravity Forms
- Gravity SMTP for WordPress
- Netlify
- Stripe
- Stripo
- Typeform
- WordPress
- WP Mail SMTP
- Zapier
- Tabular
- SureTriggers
- Marka Email Generator
Stream
Leader- Jenkins
- GitHub
- Postman
- Xcode
- Android Studio
- React
- React Native
- Flutter
- Swift
- SwiftUI
- Kotlin
- Jetpack Compose
- Expo
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.