# Postmark vs Stream

**Leader by Vioscale score:** Stream

| Attribute | Postmark | Stream |
|---|---|---|
| **Vioscale score** | 63.1 (49% (low)) | 80.3 (72% (medium)) |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | 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. | A 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. |
| features.capabilities | `{"email":true,"two_way":true,"global_coverage":"global","deliverability_tools":true,"usage_pricing_transparent":true}` | `{"chat":true,"video":true,"voice":true,"two_way":true,"global_coverage":"global","usage_pricing_transparent":true}` |
| integrations.count | 22 | 14 |
| integrations.list | `[{"name":"Mailcoach"},{"name":"Datadog"},{"name":"Craft CMS"},{"name":"Customer.io"},{"name":"ActiveCampaign"},{"name":"Supabase"},{"name":"Bubble"},{"name":"Figma"},{"name":"Google Sheets"},{"name":"Gravity Forms"},{"name":"Gravity SMTP for WordPress"},{"name":"Netlify"},{"name":"Slack"},{"name":"Stripe"},{"name":"Stripo"},{"name":"Typeform"},{"name":"WordPress"},{"name":"WP Mail SMTP"},{"name":"Zapier"},{"name":"Tabular"},{"name":"SureTriggers"},{"name":"Marka Email Generator"}]` | `[{"name":"Jenkins"},{"name":"GitHub"},{"name":"Slack"},{"name":"Postman"},{"name":"Xcode"},{"name":"Android Studio"},{"name":"React"},{"name":"React Native"},{"name":"Flutter"},{"name":"Swift"},{"name":"SwiftUI"},{"name":"Kotlin"},{"name":"Jetpack Compose"},{"name":"Expo"}]` |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":true,"ios":true,"web":true,"android":true}` |
| pricing | `{"type":"subscription","plans":[{"free":true,"name":"Free","summary":"$0/mo","features":["100 emails/month","REST API","SMTP","Transactional email","Sandbox Mode","Up to 10 custom domains","45-day retention","Up to 10 users"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"For testing and evaluation","contactSales":false,"includedLimits":{"emails":"100/mo"}},{"free":false,"name":"Basic","summary":"$15/mo + $1.80 per 1,000 overage emails","features":["10,000+ emails/month","Industry-leading deliverability","45-day retention","5 custom domains","Unlimited emails/day","Detailed analytics","Up to 4 users","Up to 15 message streams"],"components":[{"kind":"fixed","amount":15,"period":"month","currency":"USD"},{"per":{"qty":1000,"unit":"emails"},"kind":"metered","amount":1.8,"currency":"USD"}],"description":"For solo developers and smaller teams","contactSales":false,"includedLimits":{"emails":"10,000/mo"}},{"free":false,"name":"Pro","summary":"$16.50/mo + $1.30 per 1,000 overage emails","features":["10,000+ emails/month","Industry-leading deliverability","Customizable retention up to 365 days","10 custom domains","Unlimited emails/day","Inbound email processing","Bulk Email API","Detailed analytics","Up to 6 users","Up to 30 message streams"],"components":[{"kind":"fixed","amount":16.5,"period":"month","currency":"USD"},{"per":{"qty":1000,"unit":"emails"},"kind":"metered","amount":1.3,"currency":"USD"}],"description":"For startups and small businesses","contactSales":false,"includedLimits":{"emails":"10,000/mo"}},{"free":false,"name":"Platform","summary":"$18/mo + $1.20 per 1,000 overage emails","features":["10,000+ emails/month","Industry-leading deliverability","Customizable retention up to 365 days","Unlimited custom domains","Unlimited emails/day","Inbound email processing","Bulk Email API","Detailed analytics","Unlimited users","Unlimited message streams"],"components":[{"kind":"fixed","amount":18,"period":"month","currency":"USD"},{"per":{"qty":1000,"unit":"emails"},"kind":"metered","amount":1.2,"currency":"USD"}],"description":"For agencies and larger teams","contactSales":false,"includedLimits":{"emails":"10,000/mo"}}],"addOns":[{"name":"Dedicated IPs","components":[{"kind":"fixed","amount":50,"period":"month","currency":"USD"}]},{"name":"Custom activity retention","components":[{"kind":"fixed","amount":5,"period":"month","currency":"USD"}]}],"summary":"From $15/mo. Free tier with 100 emails/month. Pay-as-you-go overages starting at $1.80 per 1,000 emails.","currency":"USD","freeTier":true,"sourceUrl":"https://postmarkapp.com","retrievedAt":"2026-08-05T14:11:12.615Z","startingPrice":{"amount":1.2,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | `{"type":"hybrid","plans":[{"free":true,"name":"Free","summary":"125k API calls, 5k activities/month","features":["Flat & Timeline Feeds","Notification & Aggregated Feeds","Security & Compliance","Global Edge Network"],"contactSales":false,"includedLimits":{"monthly_api_calls":"125,000","monthly_activities":"5,000"}},{"free":false,"name":"Start","summary":"$499/month billed annually, or $599/month","features":["All Feeds API features","Ranked Feeds","Ticketed Support","Security & Compliance","Global Edge Network"],"commitment":"annual","components":[{"kind":"fixed","amount":499,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"monthly_api_calls":"1,250,000","monthly_activities":"50,000"}},{"free":false,"name":"Elevate","summary":"$899/month billed annually, or $999/month","features":["All Feeds API features","Ranked Feeds","Ticketed Support","Security & Compliance","Global Edge Network"],"commitment":"annual","components":[{"kind":"fixed","amount":899,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"monthly_api_calls":"3,750,000","monthly_activities":"150,000"}},{"free":false,"name":"Enterprise","summary":"Custom pricing, scales to 100M+ users","features":["Activity-based pricing","99.999% SLA","SAML/SSO","Private Dedicated Servers","24/7 Support"],"commitment":"annual","contactSales":true}],"addOns":[{"name":"Image & File CDN Bandwidth","components":[{"per":{"qty":1,"unit":"GB"},"kind":"metered","amount":0.17,"currency":"USD"}]},{"name":"Image & File Storage","components":[{"per":{"qty":1,"unit":"GB"},"kind":"metered","amount":0.07,"currency":"USD"}]},{"name":"Image Resizing","components":[{"per":{"qty":1000,"unit":"images"},"kind":"metered","amount":5.8,"currency":"USD"}]}],"summary":"Free tier plus $499–$899/month plans with activity and API call overages. Free Maker program for companies under 5 team members and $10k MRR.","currency":"USD","freeTier":true,"sourceUrl":"https://getstream.io/activity-feeds/pricing/","retrievedAt":"2026-08-14T10:25:51.982Z","startingPrice":{"amount":499,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | freemium |
| pricing.price_level | low | high |
| pricing.transparent | yes | yes |
| reliability.sla_pct | - | 99.999 |
| reliability.status_page | yes | yes |
| security.disclosure_policy | - | yes |
| security.gdpr | yes | yes |
| security.hipaa | - | yes |
| security.iso27001 | - | yes |
| security.soc2 | - | yes |

## Capabilities (Communication APIs)

| Capability | Postmark | Stream |
|---|:--:|:--:|
| **Channels** |  |  |
| SMS | - | - |
| Voice | - | ✓ |
| WhatsApp | - | - |
| RCS | - | - |
| Transactional email | ✓ | - |
| Video / real-time | - | ✓ |
| In-app chat | - | ✓ |
| Verify / OTP / 2FA | - | - |
| **Messaging** |  |  |
| Two-way messaging | ✓ | ✓ |
| **Reach** |  |  |
| Geographic coverage | Global | Global |
| **Delivery** |  |  |
| Email deliverability tools | ✓ | - |
| **Commercial** |  |  |
| Published per-unit pricing | ✓ | ✓ |

*Source: Vioscale. Generated 2026-09-01T16:38:30.653Z. "-" = undocumented, not absent.*