# Postmark vs Sinch

**Leader by vioscaleAI score:** Sinch

| Attribute | Postmark | Sinch |
|---|---|---|
| **vioscaleAI score** | 59.9 (48% (low)) | 77.9 (68% (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 unified platform providing enterprise-grade messaging, voice, and email capabilities with built-in delivery, compliance, and fraud protection. Offers both developer APIs and ready-made applications for marketing, notifications, identity verification, and customer support. It is indexed under Communication APIs.","source":"https://www.sinch.com","question":"What is Sinch?","confidence":0.6},{"answer":"Sinch offers a free tier, so you can start without paying. Paid plans start at $0.01. Pricing changes often, so verify at source before relying on it.","source":"https://www.sinch.com","question":"Is Sinch free?","confidence":0.6},{"answer":"We have confirmed browser-based access to Sinch. 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://www.sinch.com","question":"What platforms does Sinch support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Sinch, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.sinch.com","question":"Can Sinch be self-hosted?","confidence":0.6},{"answer":"We have confirmed 13 integrations for Sinch, including Genesys, 3CX, Adobe, Emarsys, SAP, HubSpot, Shopify and Mailjet, plus 5 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.sinch.com","question":"What does Sinch integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001 and GDPR for Sinch. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Sinch not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.sinch.com/security","question":"What security certifications does Sinch 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. | A communications platform providing APIs for sending SMS messages, making voice calls, sending emails, and verifying user identities with enterprise-grade infrastructure spanning 60+ countries and 99.99% uptime. |
| features.capabilities | `{"email":true,"two_way":true,"global_coverage":"global","deliverability_tools":true,"usage_pricing_transparent":true}` | `{"rcs":true,"sms":true,"chat":true,"email":true,"video":true,"voice":true,"two_way":true,"whatsapp":true,"verify_otp":true,"global_coverage":"global","deliverability_tools":true,"usage_pricing_transparent":false}` |
| integrations.count | 21 | 13 |
| 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":"Genesys"},{"name":"3CX"},{"name":"Adobe"},{"name":"Emarsys"},{"name":"SAP"},{"name":"HubSpot"},{"name":"Shopify"},{"name":"Mailjet"},{"name":"Mailgun"},{"name":"SimpleTexting"},{"name":"ClickSend"},{"name":"Chatlayer"},{"name":"Contact Pro"}]` |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"web":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":"usage","plans":[{"free":false,"name":"Voice API Calling","summary":"From $0.01/minute for outbound calls","features":["Domestic calling in 60+ countries","International calling","In-app calling","SIP interface","Call recording","Transcription","Text to speech","IVR menus","Number masking","Answering machine detection"],"components":[{"per":{"qty":1,"unit":"minute"},"kind":"metered","amount":0.01,"currency":"USD"}],"description":"Pay-as-you-go voice calling with transparent per-minute pricing","contactSales":false},{"free":true,"name":"Phone Numbers","summary":"Setup: $0.00, Monthly: $0.00","features":["Receive calls","Domestic calling"],"components":[{"kind":"one_time","amount":0,"currency":"USD"},{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Local business phone numbers","contactSales":false}],"summary":"Pay-as-you-go from $0.01/minute for voice calls. Free trial available.","currency":"USD","freeTier":true,"sourceUrl":"https://www.sinch.com","retrievedAt":"2026-08-05T14:24:33.982Z","startingPrice":{"amount":0.01,"period":"month","currency":"USD"},"billingPeriods":["month"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | freemium |
| pricing.price_level | low | low |
| pricing.transparent | yes | no |
| reliability.sla_pct | - | 99.99 |
| reliability.status_page | yes | yes |
| security.disclosure_policy | - | yes |
| security.gdpr | yes | yes |
| security.iso27001 | - | yes |
| security.soc2 | - | yes |

## Capabilities (Communication APIs)

| Capability | Postmark | Sinch |
|---|:--:|:--:|
| **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 2026-10-18T19:24:48.213Z. "-" = undocumented, not absent.*