Build powerful forms, surveys and quizzes with AI in minutes
BlockSurvey records 302,480 monthly visits with -14.9% month-over-month growth and Freemium, Paid pricing. LightFill records 0 monthly visits with — growth and Contact for Pricing pricing.

An AI form filler that reads your documents and completes online forms in one click.
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | blocksurvey.io | chromewebstore.google.com |
| Pricing Model | Freemium, Paid | Contact for Pricing |
| Monthly Visits | 302.48K (302,480) | 0 (0) |
| MoM Traffic Delta | -52.92K (-14.9%) | 0 (—) |
| Primary Market & Share | 🇺🇸 United States (25.1%) | 🌐 Global (—) |
| Direct Visits / mo | 259.19K | 0 |
| User Rating | 4.2 | 3.5 |
| Supported Platforms | Website | Browser Extension |
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.

An AI form filler that reads your documents and completes online forms in one click.
Reads structured values out of ID cards, passports, invoices and other documents instead of asking you to type them.
Maps extracted values into the fields of the web form you are looking at, so a completed form is one action away.
Built to handle multiple document layouts and the varied field arrangements of administrative and checkout forms.
Removes the slow, mistake-prone copy-typing that dominates routine paperwork and online purchasing.
Build powerful forms, surveys and quizzes with AI in minutes
Broader template library and poll features, but lacks specialized privacy-first cryptographic encryption for sensitive survey responses.

Faster AI form and logic generation from text prompts, but without client-side end-to-end encryption.

Better interactive quizzes and lead capture polls, but less focused on secure research surveys and data privacy.
Better interactive quizzes and lead capture polls, but less focused on secure research surveys and data privacy.

Supports unique MCP server integrations for AI form generation, but lacks BlockSurvey's strict cryptographic privacy focus.
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

Stronger automated analysis of open-ended response data, but fewer privacy-focused enterprise encryption guarantees.
Stronger automated analysis of open-ended response data, but fewer privacy-focused enterprise encryption guarantees.

AI that fills your PDF and Word forms for you
AI that fills your PDF and Word forms for you

SpecialistConversational AI forms that ask and answer questions
SpecialistConversational AI forms that ask and answer questions

Better conversational form generation with visual logic rules, but lacks zero-knowledge privacy features.