Alternatives to Quant-UX

Quant-UX: Open source prototyping and user research tool for design, testing, and analytics. 8 products similar to Quant-UX, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 4 of 8 have an API, 2 of 8 offer an MCP server, 3 of 8 are open source.

Proto.io
Prototyping for all
Frontend & design free tier
JSONing Fake API
Free and open source fake API for testing and prototyping
Testing & QA free tierAPIopen source
OnlineInterview.io
Free online tech interview platform with code editor, video chat, and drawing board
Developer productivity free tier
Appsmith
Open-source low-code application platform for building custom internal apps and admin panels.
No-code & automation free tieropen source
kogiQA
Zero Selector UI testing for web applications
Testing & QA free tierAPIMCPSDK
Marvel
Design platform for wireframing, prototyping, user testing and design handoff
Frontend & design free tierAPI
Appetize.io
Cloud-based iOS simulators and Android emulators accessible in a web browser, for humans and AI agents.
Testing & QA free tierAPISDK
Insomnia
Collaborative API development platform for designing, debugging, and testing APIs
Developer productivity free tierMCPopen source

Side by side

Product	Pricing	Free tier	API	MCP server	SDK	Open source
Quant-UX	Free	yes	no	no	no	yes
Proto.io	Freemium	yes	no	no	no	no
JSONing Fake API	Free	yes	yes	no	no	yes
OnlineInterview.io	Free	yes	no	no	no	—
Appsmith	Freemium · from $0	yes	no	no	no	yes
kogiQA	Usage-based	yes	yes	yes	yes	no
Marvel	Freemium	yes	yes	no	—	no
Appetize.io	Freemium	yes	yes	no	yes	no
Insomnia	Freemium	yes	no	yes	no	yes

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

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