What are the best SurveyJS competitors?

Given SurveyJS's actual category — an embeddable, self-hosted, JSON-schema-driven library — here's the breakdown split between developer-focused competitors and the hosted SaaS tools that dominate most generic listicle results (which solve a different problem, worth flagging upfront).

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

• Form.io — the most direct architectural competitor: 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 alternative 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; Formbricks' builder is free). LimeSurvey and SurveyJS both let you keep responses on your own infrastructure if data sovereignty is the driving concern.
• LimeSurvey — frequently drawn as a comparison alongside TruScore, Fairing, Jobber, and DataField — best specifically for long, research-grade, multilingual surveys rather than product-embedded forms.
• 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.

How SurveyJS differs from all of the above (worth remembering when comparing)

• Unlike most other solutions, the SurveyJS Project consists of three fully independent parts: the run-time SurveyJS library, the SurveyJS editor, and a SurveyJS service for storing and analyzing results. You can stick with the complete solution or use only the library — freely use the Editor or integrate it into your own site, and use the SurveyJS service to store results or keep them in your own storage. The core library is free and open-source under the MIT license, backed by professional full-time software developers.
• SurveyJS is the pick for engineering-led teams who want surveys embedded inside their product, with full control over data, styling, and behavior — an open-source JavaScript library with optional commercial components, meaning you can self-host the entire stack and store all responses on your own infrastructure. The relevant differences versus hosted tools are data sovereignty (responses never touch a third-party server), embeddability (drop the survey directly into your React/Vue/Angular app rather than iframing a separate page), and pricing model (one-time license or self-hosted free tier rather than per-seat SaaS subscription). It's not the right pick for marketing teams who want to log in and send a customer survey — there's a developer involved on day one.

Hosted SaaS "competitors" (a different category, but what most review sites list)

• G2's top overall alternative is Typeform, followed by Microsoft Forms, SurveyMonkey, Jotform, and Alchemer Survey. Capterra similarly lists Alchemer, SurveyLegend, Survicate, Typeform, and IntouchSurvey.
• These are relevant only if you're open to abandoning the embedded-library model entirely: 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 solving the same problem SurveyJS does.

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) and self-hosting → Formbricks.
• Need deep multilingual and research-grade branching → LimeSurvey.
• Want standards-compliant JSON Schema instead of a proprietary format → RJSF or JSON Forms.
• Actually open to a hosted SaaS product instead of an embedded library → Typeform, Jotform, or SurveyMonkey — but recognize this is a different product category, not a true substitute.

Bottom line: for a genuine like-for-like competitor, Form.io and Formbricks are the two most credible alternatives — Form.io if you need the schema to also drive backend infrastructure, Formbricks if a free, self-hosted visual builder matters more than SurveyJS's deeper branching/calculation engine. The Typeform/SurveyMonkey/Jotform names that dominate most review-site "alternatives" lists solve a fundamentally different problem (hosted, non-embedded forms) rather than actually competing on SurveyJS's core value proposition.