Softwr

Communication · head to head

Courier vs Flock

Courier logo

Courier

Communication

Notification infrastructure API for sending messages across channels

From
Free
Rated
-
Full reviewWebsite
Flock logo

Flock

Communication

Organized team communication platform

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.; Flock the Starter plan only makes the most recent 10,000 messages searchable and caps public channels at 10
  • They diverge on capability: Courier covers Multi-channel sending, Flock covers Team chat.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Courier and Flock actually diverge.

Attributes where Courier and Flock differ
AttributeCourierFlock
Pricing modelusage-basedsubscription
Platformsweb, apiWeb, Windows, Macos, Ios, Android
FoundedUnknown2014

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 Flock

  • Team chat
  • Channels
  • Threads
  • File sharing
  • Polls
  • Integrations
  • Mobile apps
  • Slack

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 Flock
  • Building automated notification journeysnot Flock
  • Digesting multiple alerts into a single messagenot Flock
  • Localizing notification content with AI translationnot Flock

Flock

  • Team messaging with channels, direct messages and file sharingnot Courier
  • Running polls, to-dos and reminders inside a chat workspacenot Courier
  • Video conferencing and screen sharing for small teamsnot 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.

Flock

  • The Starter plan only makes the most recent 10,000 messages searchable and caps public channels at 10
  • Starter storage is 5 GB for the entire team, against 10 GB per member on Pro and 20 GB per member on Enterprise
  • Starter allows a single team admin and a single approved domain
  • Group video calls and screen sharing require the Pro plan; Starter is limited to 1-1 video calls
  • Group video calls are capped at 20 participants even on Enterprise
  • Single Sign-On and Active Directory sync are Enterprise only
  • Enterprise is quote only, with no published rate, and is positioned for organisations with 100 or more members
  • Unlimited auto-join and announcement channels require Enterprise; Starter and Pro get one of each

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

Flock

Free
  • FreeFree
    • Unlimited chats
    • Channels
    • File sharing
  • Pro$5/month
    • Everything in Free
    • Advanced search
    • API access

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 Flock if

  • You need team chat.
  • You want to start without paying.
  • You work on Web, Windows, Macos, Ios, Android.
  • You also want channels.
Flock review

Questions people ask

Is Courier or Flock better?
Neither clearly leads. Courier starts at Free and Flock at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Courier or Flock?
Courier starts at Free and Flock at Free.
Does Courier or Flock run on more platforms?
Courier runs on web, api. Flock runs on Web, Windows, Macos, 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 Flock is typically brought in for.
What can Courier do that Flock cannot?
Courier covers Multi-channel sending, Journeys and broadcasts, Digest and batching, AI translations. Flock covers Team chat, Channels, Threads, File sharing.

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
Flock: Does Flock offer a free plan?

Yes, Flock's Starter plan is free and supports teams with 1-20 members, including 10,000 searchable messages and 5 GB storage.

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
Flock: What does Flock's Pro plan include?

The Pro plan supports teams with 20-100 members and offers unlimited messages, 10 GB per team member storage, and a 30-day free trial with no credit card required.

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
Flock: How does Flock charge for external guests?

External guests are free for 90 days from date of invitation. After 90 days, guests are charged at the same rate as other team members.

Source
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