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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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OpnForm
✓ verifiedPaid
Open-source AI form builder for free forms and surveys; strong adoption and traffic.
30K visits/mo684 saves
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Weavely.ai
✓ verifiedFreemium
Free AI form builder that generates surveys and lead-gen forms from a prompt, document, or voice note in seconds.
59K visits/mo35K saves
Pricing
No public pricing
DEVELOPER: FREE
STARTER: $119 / month
GROWTH: $599 / month
ENTERPRISE: Starting at $1,800 / month
No public pricing
Free: $0
Pro (Monthly): $16 per month
Pro (Yearly): $16 per month (billed yearly)
Free: €0/month (unlimited forms and responses)
Pro: €180/year (custom domain, remove branding, multilingual forms)
Core features
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- ✦Developer-first platform for AI-powered integrations
- ✦Secure, isolated sandboxes for running JavaScript/Python code
- ✦Automatic management of npm/PyPI dependencies
- ✦Built-in platform plumbing: secrets, webhooks, scheduling, logs, and audit
- ✦Yep Agent (prompt → runnable processes)
- ✦MCP Server/Tools (convert code into AI agent tools)
- ✦Serverless runtime (YepCode Run) and SDK access
- ✦Fast tensor operations
- ✦Differentiable tensors for gradient-based optimization
- ✦Network connectivity
- ✦Integration with Bun and Flashlight
- ✦Support for GPU computation with CUDA (Linux) and CPU computation (macOS)
- ✦AI Form Builder
- ✦Unlimited forms, fields, and responses (Free plan)
- ✦Form logic, URL pre-fill, Hidden fields
- ✦File uploads, Custom code, Webhooks
- ✦Customizable themes and thank you pages
- ✦Form Analytics
- ✦Generates forms from a text prompt, voice note, or uploaded PDF
- ✦Auto-applies brand colors and fonts extracted from uploaded assets
- ✦AI copilot for rephrasing questions and adjusting design
- ✦Supports multistep flows, conditional logic, and answer piping
- ✦Integrates with tools like HubSpot, Sheets, Notion, Salesforce
- ✦Unlimited forms and responses on the free plan
Use cases
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- →Building complex API integrations that require custom code and logic beyond what no-code tools offer.
- →Safely running AI-generated scripts in isolated environments with secrets management.
- →Automating workflows that require large datasets, loops, branching, or custom dependencies.
- →Connecting AI agents to external databases, APIs, and services using MCP tools.
- →Creating and manipulating datasets
- →Training small machine learning models
- →Implementing advanced training and inference logic
- →Building applications that require tensor computations
- →Creating contact forms
- →Conducting surveys
- →Collecting internal announcements
- →Managing warehouse inventory check-ins
- →Gathering training feedback
- →Processing international job applications
- →Streamlining legal petitions
- →Supporting environmental initiatives
- →Building customer feedback or NPS surveys quickly
- →Creating lead-generation or intake forms without templates
- →Converting an existing PDF questionnaire into an online form
- →Teams needing on-brand forms without design work
- →Collecting structured feedback across product/CS/marketing teams
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