What are the best alternatives to SurveyJS?

Given SurveyJS's actual category — an embeddable, self-hosted, JSON-schema-driven form/survey library — here's the breakdown, split between genuine developer-focused alternatives and the hosted SaaS tools that dominate most generic review-site lists (a different category worth flagging upfront).

Developer-focused, embeddable library alternatives (closest actual match)

• Form.io — the most direct architectural alternative: JSON-schema-driven and embeddable like SurveyJS, but goes further into "forms as application infrastructure" by auto-generating REST APIs, permissions, and workflow logic from the form definition. Choose this over SurveyJS when the form needs to drive backend/business-process logic, not just render and collect data.
• Formbricks — the open-source pick when self-hosting and a free visual builder matter more than SurveyJS's deeper logic engine — SurveyJS's Survey Creator builder is a paid add-on, while Formbricks bundles a free builder with a self-hosted backend and event-based in-app triggering.
• LimeSurvey — best for long, research-grade, multilingual surveys rather than product-embedded forms; also self-hostable with full data control.
• RJSF / JSON Forms — worth considering if you want standards-based JSON Schema instead of SurveyJS's proprietary format, at the cost of building branching/scoring logic yourself on top.
• FormKit (Vue) — a lighter alternative if you don't need SurveyJS's survey-specific depth (scoring, PDF export) but want a schema-driven, code-configured form framework for Vue specifically.

What makes SurveyJS distinct — worth keeping in mind when comparing SurveyJS splits into independently usable pieces: a free, MIT-licensed rendering library, a separate visual editor (Survey Creator), and an optional hosted service for storing/analyzing results — you can use just the library and self-host everything else, or adopt the full stack. That modularity is what most competitors don't fully replicate; Form.io and Formbricks are the closest in spirit, but each makes a different trade-off (Form.io toward backend infrastructure, Formbricks toward an entirely free, less logic-deep platform).

Hosted SaaS "alternatives" (a different category, but what most review sites list) Most review platforms (G2, Capterra) list Typeform, Microsoft Forms, SurveyMonkey, Jotform, and Alchemer Survey as top SurveyJS alternatives. These are relevant only if you're open to abandoning the embedded-library model entirely — they're hosted products you link to or iframe, not something you import into your own React/Vue/Angular codebase, so they solve a fundamentally different problem than SurveyJS does. For SaaS products that need in-app NPS, onboarding surveys, or feedback widgets without sending users out of the app, a hosted tool isn't really a substitute.

How to choose

• Want the closest architectural equivalent, but with auto-generated backend APIs → Form.io.
• Want a fully free visual builder (not just the renderer) plus self-hosting → Formbricks.
• Need deep multilingual support and research-grade branching → LimeSurvey.
• Want standards-compliant JSON Schema instead of a proprietary format → RJSF or JSON Forms.
• Vue-specific, don't need survey-grade depth → FormKit.
• Actually open to a hosted SaaS product instead of an embedded library → Typeform, Jotform, or SurveyMonkey — recognizing this is a different product category, not a true like-for-like substitute.

Bottom line: for a genuine competitor rather than a category switch, Form.io and Formbricks are the two most credible alternatives — Form.io if you need the schema to also drive backend infrastructure and permissions, Formbricks if a completely free, self-hosted visual builder matters more than SurveyJS's deeper branching and calculation engine.