vioscaleAI
Comparison

Postmark vs Sinch

On the evidence we track, Sinch leads this comparison with a composite score of 78/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Postmark full profile →Sinch full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
Postmark60
★Sinch78
Score
vioscaleAI score
Postmark60 / 100low · 48%
Sinch78 / 100medium · 68%
Pricing
Free tier
Postmark✓
Sinch✓
Model
Postmarkfreemium
Sinchfreemium
Price level
Postmarklow
Sinchlow
Transparent
Postmark✓
Sinch✗
Integrations
Count
Postmark21
Sinch13
Security
Disclosure policy
Postmark–
Sinch✓
Gdpr
Postmark✓
Sinch✓
Iso27001
Postmark–
Sinch✓
Soc2
Postmark–
Sinch✓
Reliability
Sla pct
Postmark–
Sinch99.99
Status page
Postmark✓
Sinch✓
Market
Availability
Content
Faq
Postmark7 items
Sinch6 items

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

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.

Independently observed

Sinch

Leader

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.

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

Leader
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

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

Postmark or Sinch: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

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