Novu

Novu is the leading open-source notification platform. Self-host or use the cloud. Workflow editor, multi-channel routing, in-app feed component, BYO providers.

An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.

Against inbound parsing into tool calls and model-generated sends that must not duplicate, Novu covers idempotency keys, webhook coverage, event stream, batch sending, SDK breadth, and multi-tenant support, and does not cover inbound parsing and operating track record. Whether that gap matters depends on how central those are to the build.

• Inbound parsing: No
• Idempotency keys: Yes
• Webhooks: Yes
• Operating since: 2021
• Event stream: Yes
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: Yes
• SDKs: node, python, go, php, java, dotnet
• Multi-tenant: Yes

BYO provider.

Teams that want self-hostable notification infrastructure.