Industry standard collaborative whiteboarding with massive template libraries, but less streamlined for rapid AI diagram generation.

OpnForm records 76,221 monthly visits with +169% month-over-month growth and Freemium, Free Trial pricing. Whimsical records 966,895 monthly visits with -18.7% growth and Freemium pricing.
Open-source form builder with AI assistance and unlimited responses
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | opnform.com | whimsical.com |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 76.22K (76,221) | 966.9K (966,895) |
| MoM Traffic Delta |
| +47.89K (+169%) |
| -222.85K (-18.7%) |
| Primary Market & Share | 🇺🇸 United States (74.8%) | 🇮🇳 India (19%) |
|---|
| Direct Visits / mo | 37.28K | 602.36K |
|---|
| User Rating | 4.5 | 4.7 |
|---|
| Supported Platforms | Website | Website |
|---|
Open-source form builder with AI assistance and unlimited responses
The full codebase is public and auditable, and you can run OpnForm on the vendor cloud, an EU-hosted instance, or your own infrastructure for complete data ownership.
Optional AI help for building forms and fields, designed to stay out of the way when you would rather write everything yourself.
Conditional logic, computed fields, answer piping, hidden fields and redirect-on-submit rules let one form adapt to many different respondents.
Collect as many responses as you need even on the free plan, with no hidden quotas or surprise overage charges.

The collaborative whiteboard built for product builders
AI Flowcharts, AI Mind Maps and AI Wireframes convert a short text prompt into structured, fully editable diagrams, branched mind maps, or web and mobile wireflows — no manual drawing required.
Boards host diagrams, flowcharts, mind maps, wireframes, embedded media and documents side by side, so a whole product narrative lives in a single shareable file.
Multiple teammates edit the same board simultaneously with live cursors, thread comments attached to specific objects, and mention-based notifications.
Drag-and-drop UI components let teams sketch screens, link them into clickable flows and iterate on product ideas before engineering commits to a build.
Industry standard collaborative whiteboarding with massive template libraries, but less streamlined for rapid AI diagram generation.

Build powerful forms, surveys and quizzes with AI in minutes
Build forms, surveys and quizzes in seconds — with unlimited free responses
Free / Open-sourceCombines mind mapping and project workflows with AI agents, but less focused on pure visual diagramming and wireframes.
Robust collaborative whiteboard with strong AI diagramming tools, but less polished UI wireframing capabilities than Whimsical.
Privacy-first AI surveys with end-to-end encrypted responses

Dedicated diagramming platform with strong AI chart generation, but less focus on freeform collaborative brainstorming whiteboards.
SpecialistInstantly turns natural language prompts into mind maps and flowcharts, but offers less freeform canvas drawing flexibility.
Combines whiteboarding and documentation with AI generation, but lacks Whimsical's specialized wireframe shape library.
Exceptional UI wireframing and prototyping tools, but less versatile for general mind mapping and freeform brainstorming.


Free AI form builder for humans and AI agents
Industry standard collaborative whiteboarding with massive template libraries, but less streamlined for rapid AI diagram generation.
Robust collaborative whiteboard with strong AI diagramming tools, but less polished UI wireframing capabilities than Whimsical.
Privacy-first AI surveys with end-to-end encrypted responses
Dedicated diagramming platform with strong AI chart generation, but less focus on freeform collaborative brainstorming whiteboards.
SpecialistInstantly turns natural language prompts into mind maps and flowcharts, but offers less freeform canvas drawing flexibility.
Combines whiteboarding and documentation with AI generation, but lacks Whimsical's specialized wireframe shape library.
Exceptional UI wireframing and prototyping tools, but less versatile for general mind mapping and freeform brainstorming.