toolgrep / Email & messaging / Knock
Alternatives to Knock
Knock: Customer engagement infrastructure for product, marketing, and transactional messaging. 8 products similar to Knock, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 8 of 8 have an API, 6 of 8 offer an MCP server, 1 of 8 is open source.
- Knocket
One Knock. Every Connection.
- Courier
Customer messaging platform for humans and AI agents
- Flock
Team messenger and online collaboration platform
- Slack
AI work platform and productivity tools
- Novu
Open-source notification and agent communication infrastructure
- Pocket Alert
Push notification service for iOS and Android via API, webhooks, CLI, and MCP server
- Pingram
Messaging APIs for emails, SMS, voice, and WhatsApp
- Hex
The Analytics platform for humans and agents
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| Knock | Freemium · from $0 | yes | yes | yes | yes | no |
| Knocket | Free | yes | yes | no | yes | no |
| Courier | Freemium | yes | yes | yes | yes | no |
| Flock | Freemium | yes | yes | no | no | no |
| Slack | Freemium | yes | yes | yes | yes | no |
| Novu | Freemium · from $0/month (Free, 10,000 workflow runs); Pro from $30/month; Team from $250/month; Enterprise custom | yes | yes | yes | yes | yes |
| Pocket Alert | Freemium · from $6/month | yes | yes | yes | no | no |
| Pingram | Freemium · from $20/month | yes | yes | yes | yes | no |
| Hex | Freemium · from $36 per Editor / month | yes | yes | yes | no | no |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
API
curl https://toolgrep.com/api/products/knock/alternatives