# Postmark vs Stream

**Leader by vioscaleAI score:** Stream

| Attribute | Postmark | Stream |
|---|---|---|
| **vioscaleAI score** | 59.9 (48% (low)) | 80.3 (73% (medium)) |
| content.faq | `[{"answer":"A service for reliably sending transactional emails from applications using REST API or SMTP, with libraries available for multiple programming languages. It is indexed under Communication APIs.","source":"https://postmarkapp.com","question":"What is Postmark?","confidence":0.6},{"answer":"Postmark offers a free tier, so you can start without paying. Paid plans start at $1.20. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://postmarkapp.com","question":"Is Postmark free?","confidence":0.6},{"answer":"We have confirmed browser-based access to Postmark. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://postmarkapp.com","question":"What platforms does Postmark support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Postmark, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans","question":"Can Postmark be self-hosted?","confidence":0.6},{"answer":"We have confirmed 21 integrations for Postmark, including Mailcoach, Datadog, Craft CMS, Customer.io, ActiveCampaign, Supabase, Bubble and Figma, plus 13 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans","question":"What does Postmark integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Postmark. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Postmark not holding them. Always confirm compliance directly before you rely on it.","source":"https://postmarkapp.com/eu-privacy","question":"What security certifications does Postmark have?","confidence":0.7},{"answer":"Postmark is available worldwide. The vendor is headquartered in the United States.","source":"https://postmarkapp.com/blog/announcing-lower-pricing-and-monthly-plans","question":"Where is Postmark available?","confidence":0.75}]` | `[{"answer":"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. It is indexed under Communication APIs.","source":"https://getstream.io/activity-feeds/pricing/","question":"What is Stream?","confidence":0.6},{"answer":"Stream offers a free tier, so you can start without paying. Paid plans start at $499 per month. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://getstream.io/activity-feeds/pricing/","question":"Is Stream free?","confidence":0.6},{"answer":"Stream supports the web, iOS and Android. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://getstream.io/activity-feeds/pricing/","question":"What platforms does Stream support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Stream, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://getstream.io/activity-feeds/pricing/","question":"Can Stream be self-hosted?","confidence":0.6},{"answer":"We have confirmed 13 integrations for Stream, including Jenkins, GitHub, Slack, Postman, Xcode, Android Studio, React and Flutter, plus 5 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://getstream.io/activity-feeds/pricing/","question":"What does Stream integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001, HIPAA and GDPR for Stream. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Stream not holding them. Always confirm compliance directly before you rely on it.","source":"https://getstream.io/blog/content-compliance/","question":"What security certifications does Stream have?","confidence":0.7}]` |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | Postmark is a transactional email service that connects with popular CMS platforms, marketing automation tools, forms providers, and business applications to send reliable emails across your workflows. | Stream provides developer-friendly APIs and pre-built SDKs that integrate chat, live video, activity feeds, and automated content moderation into applications, allowing developers to add complex real-time features without building infrastructure from scratch. |
| 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 | 21 | 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"},{"name":"Vercel AI SDK","native":true,"direction":"bidirectional"}]` |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":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":"subscription","plans":[{"free":true,"name":"Build","summary":"Free tier for makers (projects with <5 team members and <$10k/month revenue) or $100/month credit","features":["REST API","SDKs (Node, Python, Ruby, PHP)","Webhooks","Customizable UI","Flat & Timeline Feeds","Notification & Aggregated Feeds","SOC2/ISO27001/CCPA/GDPR","Global Edge Network"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"api_calls":"125k/month","activities":"5k/month"}},{"free":false,"name":"Start","summary":"$499/month (annual commitment) or $599/month (monthly). Overages: $25 per 1k activities, $9 per 10k API calls","features":["Ranked Feeds","Ticketed Support","Dedicated Regional Servers","HIPAA","2FA","Audit Logs","24/7 Phone Support","Dedicated Slack Channel"],"commitment":"annual","components":[{"kind":"fixed","amount":499,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"api_calls":"1.25M/month","activities":"50k/month"}},{"free":false,"name":"Elevate","summary":"$899/month (annual commitment) or $999/month (monthly). Overages: $23 per 1k activities, $9 per 10k API calls","features":["All Start features"],"commitment":"annual","components":[{"kind":"fixed","amount":899,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"api_calls":"3.75M/month","activities":"150k/month"}},{"free":false,"name":"Enterprise","summary":"Custom pricing with activity-based model","features":["99.999% SLA","SAML/SSO","Private Dedicated Servers","24/7 Support","Activity-based pricing","Scale to 100M+ users"],"contactSales":true}],"addOns":[{"name":"Image & File CDN","components":[{"per":{"qty":1,"unit":"GB"},"kind":"metered","amount":0.17,"currency":"USD"},{"per":{"qty":1,"unit":"GB"},"kind":"metered","amount":0.07,"currency":"USD"},{"per":{"qty":1000,"unit":"images"},"kind":"metered","amount":5.8,"currency":"USD"}]}],"summary":"From $499/month. Free tier for makers. Usage-based overage charges.","currency":"USD","freeTier":true,"sourceUrl":"https://getstream.io/activity-feeds/pricing/","retrievedAt":"2026-09-22T14:42:50.701Z","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.starting_price | - | `{"amount":499,"currency":"USD"}` |
| 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 |
| security.trust_center | - | https://getstream.io/blog/content-compliance/ |

## 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: vioscaleAI. Generated 2026-10-16T19:14:18.076Z. "-" = undocumented, not absent.*