Alternatives to Keen

Keen: Fully managed event streaming platform built on Apache Kafka. 8 products similar to Keen, 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, 4 of 8 offer an MCP server, 1 of 8 is open source.

Aiven
AI-ready open source data platform for streaming, storing, and serving data across major cloud providers
Databases & storage free tierAPIMCPSDK
Staxa
Give every customer their own stack
Hosting & infrastructure free tierAPI
Para
Backend for busy developers
APIs & backend free tierAPISDKopen source
Stream
Scalable Chat, Video & Activity Feed APIs and SDKs
Email & messaging free tierAPISDK
LeanCloud
Serverless backend-as-a-service platform
APIs & backend free tierAPISDK
Unkey
The Developer Platform for Modern APIs
APIs & backend free tierAPIMCPSDK
Preset
AI-native business intelligence built on Apache Superset
Analytics & data free tierAPIMCP
Render
Cloud application platform for deploying, scaling, and securing apps and agents
Hosting & infrastructure free tierAPIMCPSDK

Side by side

Product	Pricing	Free tier	API	MCP server	SDK	Open source
Keen	Freemium · from 149	yes	yes	no	no	no
Aiven	Freemium · from $5/month (Developer tier); Free tier available	yes	yes	yes	yes	no
Staxa	Freemium · from $0	yes	yes	no	no	no
Para	Freemium	yes	yes	no	yes	yes
Stream	Freemium	yes	yes	no	yes	no
LeanCloud	Freemium	yes	yes	no	yes	no
Unkey	Freemium · from $0/mo	yes	yes	yes	yes	—
Preset	Freemium	yes	yes	yes	—	no
Render	Freemium · from $0	yes	yes	yes	yes	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/keen/alternatives