BlockSurvey records 302,480 monthly visits with -14.9% month-over-month growth and Freemium, Paid pricing. MarbleFlows records 0 monthly visits with 0% growth and Free pricing.
Privacy-first AI surveys with end-to-end encrypted responses
Build interactive onboarding flows and forms that capture and convert leads
| Dimension / Metric | | |
|---|---|---|
| Official Domain | blocksurvey.io | marbleflows.com |
| Pricing Model | Freemium, Paid | Free |
| Monthly Visits | 302.48K (302,480) | 0 (0) |
| MoM Traffic Delta | -52.92K (-14.9%) | 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (25.1%) | 🌐 Global (—) |
| Direct Visits / mo | 259.19K | 0 |
| User Rating | 4.2 | 3.8 |
| Supported Platforms | Website | Website |
Privacy-first AI surveys with end-to-end encrypted responses
Responses are encrypted on the respondent's device before upload, so only the survey owner holds the key and can decrypt the data.
Generate structured, less biased questionnaires from a prompt, refine wording, create answer options and add skip logic and multilingual support.
Automated thematic analysis, sentiment detection, anomaly flagging and data encoding turn open-ended answers into usable categorical insight.
Run natural back-and-forth interviews with dynamic follow-up questions that adapt to each respondent for deeper qualitative data.
Build interactive onboarding flows and forms that capture and convert leads
Assemble multi-step flows with a drag-and-drop editor, adding question types, content blocks, and branching rules without writing code.
Use conditional logic to route each visitor down the path that fits their answers, so the experience feels tailored rather than one-size-fits-all.
Embed flows as website widgets or run them as standalone pages to capture leads, run qualification quizzes, and gather feedback.
Add progress indicators and interactive touches that keep respondents engaged through longer onboarding journeys and improve completion rates.
Build powerful forms, surveys and quizzes with AI in minutes
Build forms, surveys and quizzes in seconds — with unlimited free responses
Turn answers into qualified leads.
Turn answers into qualified leads.
AI quiz, poll and survey builder that turns traffic into leads
AI quiz, poll and survey builder that turns traffic into leads
Free AI form builder for humans and AI agents
Free / Open-sourceOpen-source codebase with unlimited submissions and AI assistance, but less emphasis on end-to-end encrypted data storage.
SpecialistTurn static forms into adaptive AI conversations with structured output
SpecialistTurn static forms into adaptive AI conversations with structured output
SpecialistAI-moderated voice and video interviews that scale survey research to thousands of people at once
Build high-converting AI forms, surveys, and quizzes in seconds
Build high-converting AI forms, surveys, and quizzes in seconds
Conversational AI forms that ask and answer questions
No-code AI chatbot builder with omnichannel deployment
No-code AI chatbot builder with omnichannel deployment
