vioscale
Comparison

Postmark vs Sinch

No clear leader: Postmark (63.1) and Sinch (61.6) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Postmark full profile →Sinch full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Postmark63
Sinch62
Score
Vioscale score
Postmark63 / 100low · 49%
Sinch62 / 100medium · 73%
Pricing
Free tier
Postmark✓
Sinch✓
Model
Postmarkfreemium
Sinchfreemium
Price level
Postmarklow
Sinchlow
Transparent
Postmark✓
Sinch✗
Integrations
Count
Postmark22
Sinch13
Security
Disclosure policy
Postmark–
Sinch✓
Gdpr
Postmark✓
Sinch✓
Iso27001
Postmark–
Sinch✓
Soc2
Postmark–
Sinch✓
Reliability
Status page
Postmark✓
Sinch✓
Market
Availability

Capabilities

Feature-by-feature on the axes that matter for communication apis. “-” means undocumented, not absent.

Channels
SMS
Postmark-
Sinch✓
Voice
Postmark-
Sinch✓
WhatsApp
Postmark-
Sinch✓
RCS
Postmark-
Sinch✓
Transactional email
Postmark✓
Sinch✓
Video / real-time
Postmark-
Sinch✓
In-app chat
Postmark-
Sinch✓
Verify / OTP / 2FA
Postmark-
Sinch✓
Messaging
Two-way messaging
Postmark✓
Sinch✓
Reach
Geographic coverage
PostmarkGlobal
SinchGlobal
Delivery
Email deliverability tools
Postmark✓
Sinch✓
Commercial
Published per-unit pricing
Postmark✓
Sinch✗

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.

Independently observed

Sinch

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.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Postmark

from $1.20/moSubscriptionFree tier

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
as of verify ↗

Sinch

from $0.01/moUsage-basedFree tier

Pay-as-you-go from $0.01/minute for voice calls. Free trial available.

  • Voice API CallingFrom $0.01/minute for outbound calls
    • Domestic calling in 60+ countries
    • International calling
    • In-app calling
    • SIP interface
    • Call recording
    • +5 more
  • Phone NumbersFree
    • Receive calls
    • Domestic calling
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Postmark✓
Sinch✓
Deployment
Cloud / SaaS
Postmark✓
Sinch✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Postmark

22 total
  • Mailcoach
  • Datadog
  • Craft CMS
  • Customer.io
  • ActiveCampaign
  • Supabase
  • Bubble
  • Figma
  • Google Sheets
  • Gravity Forms
  • Gravity SMTP for WordPress
  • Netlify
  • Slack
  • Stripe
  • Stripo
  • Typeform
  • WordPress
  • WP Mail SMTP
  • Zapier
  • Tabular
  • SureTriggers
  • Marka Email Generator
Independently observed

Sinch

13 total
  • Genesys
  • 3CX
  • Adobe
  • Emarsys
  • SAP
  • HubSpot
  • Shopify
  • Mailjet
  • Mailgun
  • SimpleTexting
  • ClickSend
  • Chatlayer
  • Contact Pro
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.