Software · head to head
Courier vs Flock

Courier
Software
Notification infrastructure API for sending messages across channels
- From
- Free
- Rated
- -
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.
Where they differ
Only the attributes on which Courier and Flock actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).
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.
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.
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.
SourceCourier: 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.
SourceCourier: 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.
SourceRelated pages
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