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Communication · head to head

Courier vs Signal

Courier logo

Courier

Communication

Notification infrastructure API for sending messages across channels

From
Free
Rated
-
Full reviewWebsite
Signal logo

Signal

Communication

Speak Freely

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Courier enterprise-only features like RBAC and EU data residency require a custom sales conversation rather than a published plan.; Signal signal must be installed on a phone before the desktop app can be used, so there is no phone-free desktop-only account
  • They diverge on capability: Courier covers Multi-channel sending, Signal covers End-to-end encryption.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Courier and Signal actually diverge.

Attributes where Courier and Signal differ
AttributeCourierSignal
Pricing modelusage-basedfree
Platformsweb, apiWindows, Macos, Linux, Ios, Android
FoundedUnknown2010

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Communication).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Courier

  • Multi-channel sending
  • Journeys and broadcasts
  • Digest and batching
  • AI translations
  • MCP server and CLI
  • Role-based access control

Only in Signal

  • End-to-end encryption
  • Disappearing messages
  • Screen security
  • Group chats
  • Voice calls
  • Video calls
  • File sharing
  • No data collection

What people use each for

The jobs each tool is most often brought in to do.

Courier

  • Sending notifications across email, SMS, and push from one APInot Signal
  • Building automated notification journeysnot Signal
  • Digesting multiple alerts into a single messagenot Signal
  • Localizing notification content with AI translationnot Signal

Signal

  • Private messagingnot Courier
  • Secure group communicationnot Courier
  • Confidential conversationsnot Courier
  • Journalism communicationnot Courier
  • Family messagingnot Courier

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Courier

  • Enterprise-only features like RBAC and EU data residency require a custom sales conversation rather than a published plan.
  • Pay-as-you-go per-send pricing on Business can become costly at very high volume compared to flat committed pricing elsewhere.
  • The free Developer tier is capped at 10,000 sends per month, which is limiting for growing production apps.

Signal

  • Signal must be installed on a phone before the desktop app can be used, so there is no phone-free desktop-only account

Pricing, plan by plan

Courier

Free
  • DeveloperFree
    • 10,000 sends/month
    • Journeys and broadcasts
    • MCP server, CLI, and SDKs
  • Business$undefined/month
    • $0.005 per send pay-as-you-go
    • AI translations
    • AI agent node
  • Enterprise$undefined/month
    • Volume discounts
    • Dedicated Slack channel
    • Role-based access control

Signal

Free
  • FreeFree
    • End-to-end encrypted messaging
    • Voice and video calls
    • Group chats

Which should you pick?

Choose Courier if

  • You need multi-channel sending.
  • You want to start without paying.
  • You work on web, api.
  • You also want journeys and broadcasts.
Courier review

Choose Signal if

  • You need end-to-end encryption.
  • You want to start without paying.
  • You work on Windows, Macos, Linux, Ios, Android.
  • You also want disappearing messages.
Signal review

Questions people ask

Is Courier or Signal better?
Neither clearly leads. Courier starts at Free and Signal at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Courier or Signal?
Courier starts at Free and Signal at Free.
Does Courier or Signal run on more platforms?
Courier runs on web, api. Signal runs on Windows, Macos, Linux, Ios, Android.
Can I use Courier for free?
Both have a free tier, so you can try either at no cost before committing.
What is Courier best used for?
Courier is most often used for sending notifications across email, sms, and push from one api, building automated notification journeys, digesting multiple alerts into a single message, localizing notification content with ai translation. Of those, sending notifications across email, sms, and push from one api and building automated notification journeys are not what Signal is typically brought in for.
What can Courier do that Signal cannot?
Courier covers Multi-channel sending, Journeys and broadcasts, Digest and batching, AI translations. Signal covers End-to-end encryption, Disappearing messages, Screen security, Group chats.

Answered from the vendors’ own pages

Courier: What does Courier cost?

Courier has three plans: Developer is free for 10,000 sends per month, Business is pay-as-you-go at $0.005 per send, and Enterprise is custom-priced with volume discounts.

Source
Signal: How much does Signal cost?

Signal is free for everyone. The messaging app is supported by grants and donations, not user fees, and is maintained by an independent nonprofit that is not tied to any major tech companies.

Source
Courier: Is there a free plan, and what are its limits?

Yes, the Developer plan is free and includes 10,000 notification sends per month along with journeys, broadcasts, the MCP server, CLI, SDKs, and email support.

Source
Signal: Does Signal have ads?

No. Signal is ad-free and does not collect advertising revenue.

Source
Courier: How is usage metered?

Courier bills based on the number of notifications sent, not on team size or number of channels used, with Business plan sends charged at $0.005 each.

Source
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