superfill.ai

Overview

Tired of typing the same information into endless online forms? From job applications to dating profiles, repetitive data entry is a universal time-waster. Enter Superfill.ai, an open-source AI browser extension designed to reclaim your time. Launched on Product Hunt on December 3, 2025 (achieving 89 upvotes and 11 comments), and featured on Hacker News the same day, the platform doesn’t just store your information—it understands it.

Superfill.ai intelligently remembers your personal details through a “memory system” of question-answer pairs and uses AI to auto-fill forms with contextually appropriate answers through semantic understanding rather than simple pattern matching. The extension works across any website with forms including job boards (LinkedIn, Indeed), dating apps (Hinge, Bumble), rental applications, surveys, and client intake forms, making tedious tasks a thing of the past.

Key Features

Superfill.ai is packed with powerful features that prioritize both intelligence and security. Here’s what makes it stand out:

• AES-256 Local Encryption: Your data is secured with top-tier, military-grade encryption with API keys protected by AES-256 encryption and stored locally in your browser first. This “local-first” approach (Phase 1 complete) means you have full control and ownership of your sensitive information with zero telemetry tracking.
• Contextual Matching with AI-Powered Intelligence: Unlike basic auto-fillers that rely on simple text matching (regex) or CSS selectors, Superfill.ai’s AI understands the context of form questions. It intelligently matches your stored answers to the form’s specific fields using vector similarity search against embedded representations of each field’s semantic meaning, ensuring accuracy with confidence scoring for each suggestion.
• Smart Rephrasing with LLM Integration: Superfill.ai uses the power of Large Language Models (LLMs) to rephrase your stored answers to fit the unique tone and requirements of each question, whether it’s a professional job application or a casual dating profile. The AI adapts core answers based on document analysis and conversational refinement.
• Multi-AI Provider Support (BYOK Model): The extension supports OpenAI, Anthropic (Claude), Groq, DeepSeek, Google Gemini, and Ollama for local AI inference. The “Bring Your Own Key” (BYOK) model means no vendor lock-in—you control your AI costs and data privacy by providing your own API keys directly.
• Smart Memory Management System: Store unlimited question-answer pairs (called “memories”) with automatic AI categorization and smart tagging for better organization. The system provides search, filter, and sort capabilities with CSV import/export for bulk operations and backups.
• Cross-Browser Compatibility: Works on Chrome, Edge, Firefox, and Safari (in progress). The WXT Framework provides unified codebase across Chromium-based browsers with platform-specific optimizations.
• Universal Website Compatibility: Functions identically across job boards, dating platforms, government portals, survey tools, rental applications, and any website with HTML form elements. The extension injects fill suggestions without modifying website code or requiring developer APIs.
• Open Source \& Free Forever: The core features are open-source (MIT license on GitHub: https://github.com/superfill-ai/superfill.ai) and will always remain free. The commitment to transparency allows you to trust the code and benefit from a community-driven project built with React 19, TypeScript 5.7+, and Bun runtime.
• Modern Tech Stack: Built with TypeScript, React 19, WXT Framework, Vercel AI SDK, shadcn/ui, with full dark mode support, keyboard shortcuts, and responsive design.

How It Works

Getting started with Superfill.ai is incredibly straightforward. The process is designed to be seamless and intuitive, integrating directly into your browsing workflow.

Stage 1: Memory Building
You simply store your information—like your work history, educational background, personal bio, skills, or favorite icebreaker answers—one time within the extension as question-answer pairs. The system provides optional tags and categories for organization, or AI can automatically categorize entries using semantic analysis for quick retrieval.

Stage 2: Automatic Form Detection
When you encounter an online form, Superfill.ai automatically detects the fields using DOM event listeners that monitor active form elements. The extension continuously watches for form structures on any webpage you visit.

Stage 3: AI Contextual Analysis
The AI gets to work by querying locally stored data via vector similarity search against embedded representations of each field’s semantic meaning. It retrieves relevant data from your stored information and analyzes the context of each question to determine appropriate matches.

Stage 4: Smart Filling
When matches exceed confidence thresholds (displayed as confidence scores), suggestions appear in a non-intrusive UI overlay. The AI rephrases stored answers to perfectly match the context, tone, and specific requirements of each question. All processing occurs in the browser’s secure sandbox using WebAssembly-optimized inference engines.

Stage 5: Review \& Control
You maintain full control through manual approval mechanisms before any data enters form fields. You can review, edit, or reject any field before submitting with one-click autofill for rapid completion.

Use Cases

The power of intelligent form-filling can be applied to a wide range of everyday online tasks. Here are examples where Superfill.ai can save hours of effort:

Job Application Automation:

• Quickly fill out dozens of job applications on LinkedIn, Indeed, and other job boards, with AI tailoring your experience and skills to each unique role description
• Automatically populate work history, education, references, and custom essay questions with contextually appropriate responses
• Maintain consistency across applications while adapting tone for different company cultures

Dating Profile Creation:

• Effortlessly create compelling profiles on various dating sites (Hinge, Bumble, Match), with AI rephrasing your interests and bio to fit each platform’s style and question format
• Adapt the same core personality description to casual or serious tones based on platform expectations

Rental and Housing Applications:

• Breeze through tedious rental applications requesting employment history, references, emergency contacts, and income verification
• Handle repetitive housing portals (Zillow, Apartments.com) with consistent information delivery

Government and Administrative Forms:

• Fill out complex government forms (USAJobs, IRS forms, benefits applications) that ask for the same information in slightly different phrasings
• Navigate medical intake forms, insurance applications, and administrative paperwork with accuracy

Survey Completion:

• Tackle long and detailed surveys with ease as the AI pulls from your stored opinions and data to provide relevant, contextually appropriate answers
• Complete market research surveys, academic questionnaires, and feedback forms rapidly

Freelance and Client Intake:

• Handle repetitive client onboarding forms requesting project details, availability, rates, and portfolio information
• Streamline contractor agreements and service agreements with consistent professional responses

Pros \& Cons

Like any tool, especially one in active development, Superfill.ai has its unique strengths and areas for growth.

Advantages

• Open Source \& Free Core Features: The core functionality is free forever under MIT license, and its open-source nature fosters trust, transparency, and community collaboration with no vendor lock-in.
• Massive Time Savings: Automates one of the most repetitive and time-consuming online activities, potentially saving hours per week for job seekers, freelancers, and frequent form fillers.
• High Security \& Privacy-First: With AES-256 encryption for API keys, local-first storage model (Phase 1), and BYOK approach, your data remains private and under your control with zero telemetry or data collection.
• Intelligent \& Adaptable: Goes beyond simple copy-pasting by using AI to rephrase answers contextually through semantic understanding and confidence-scored suggestions, adapting tone for professional vs. casual contexts.
• Multi-AI Provider Flexibility: Supports OpenAI, Anthropic, Groq, DeepSeek, Google Gemini, and Ollama (local inference), allowing users to choose optimal models for cost/quality trade-offs.
• Cross-Browser Compatibility: Works on Chrome, Edge, Firefox with Safari support in progress, providing flexibility across browsing environments.
• Active Development: Transparent roadmap on GitHub with regular updates and community-driven improvements.

Disadvantages

• Early Stage Product: The tool launched December 2025 and is still in Phase 1 completion, so users may encounter occasional bugs or missing features. Phase 2 features (select/radio/checkbox fields, Safari support, cloud sync) are still in development.
• API Costs Required: The BYOK model means users must source and pay for their own API keys from providers like OpenAI or Anthropic. While costs are typically “pennies per form fill,” there’s no built-in free AI access—you pay your provider directly based on usage.
• Technical Setup Barrier: Users must understand API concepts, navigate provider dashboards to generate keys, and configure the extension—creating friction for non-technical users unfamiliar with AI APIs.
• Limited to Input/Textarea Fields Currently: Phase 1 supports only input and textarea fields. Advanced field types (select dropdowns, radio buttons, checkboxes) are planned for Phase 2 but not yet available.
• No Cloud Sync Yet: Local-first storage means your data doesn’t automatically sync across devices or browsers. Cloud sync is planned as a premium feature but not currently available.
• Premium Features Coming Soon: Advanced features such as cloud AI models, agentic RAG (Retrieval-Augmented Generation), browser syncing, industry-specific templates, and semantic search are planned for a future premium version and are not yet available.

How Does It Compare?

Superfill.ai vs. LastPass / 1Password

LastPass and 1Password are excellent password managers that also store identity information and basic form-fill data.

Core Functionality:

• Superfill.ai: AI-powered form filler using LLMs to understand context and rephrase answers; focused exclusively on intelligent form completion
• LastPass/1Password: Password management with basic identity auto-fill; stores static, pre-saved text that pastes identically everywhere

Intelligence Level:

• Superfill.ai: Semantic understanding of form context with adaptive rephrasing—same core information adapted to professional (LinkedIn) vs. casual (social media) contexts
• LastPass/1Password: Simple field-name matching with no AI understanding; pastes exact same text regardless of context or tone requirements

Privacy \& Data Control:

• Superfill.ai: Local-first storage (Phase 1), BYOK with user-controlled API keys, zero telemetry
• LastPass/1Password: Cloud-based storage with encrypted vaults on company servers

When to Choose Superfill.ai: For intelligent form completion with contextual adaptation, when you need AI rephrasing for different platforms, and when local-first privacy with BYOK is priority.
When to Choose LastPass/1Password: For password management as primary need, simple identity auto-fill without AI, and when comprehensive password security features outweigh form-filling intelligence.

Superfill.ai vs. Simplify

Simplify is a form-filling extension specifically designed to streamline job applications with autofill capabilities.

Specialization:

• Superfill.ai: Universal form filler working across job boards, dating sites, rental portals, surveys, and any website with forms
• Simplify: Primarily focused on job application automation with specialized integrations for job boards

AI Capabilities:

• Superfill.ai: Multi-AI provider support with contextual understanding, confidence scoring, and adaptive rephrasing
• Simplify: Limited AI features; focuses on streamlined application tracking and basic autofill

Scope:

• Superfill.ai: Works on any website with HTML form elements across all use cases
• Simplify: Specialized for job search workflows with application tracking features

When to Choose Superfill.ai: For universal form-filling beyond just job applications, when AI-powered contextual adaptation is needed, and for open-source transparency.
When to Choose Simplify: For specialized job search workflows with application tracking, when job-specific features like saved searches and application organization are priorities.

Superfill.ai vs. AI Form Fill

AI Form Fill is another AI-powered browser extension for automatic form completion.

Open Source:

• Superfill.ai: Fully open-source (MIT license) with transparent codebase on GitHub
• AI Form Fill: Proprietary closed-source solution

Privacy Model:

• Superfill.ai: BYOK with local-first storage and zero telemetry
• AI Form Fill: Likely cloud-processed with less transparency about data handling

Multi-AI Support:

• Superfill.ai: OpenAI, Anthropic, Groq, DeepSeek, Google Gemini, Ollama (6+ providers)
• AI Form Fill: Unclear which AI providers are supported or if users can choose

When to Choose Superfill.ai: For open-source transparency, BYOK privacy control, multi-AI provider flexibility, and local-first storage.
When to Choose AI Form Fill: When closed-source convenience is acceptable and setup simplicity outweighs transparency.

Superfill.ai vs. Instafill.ai

Instafill.ai is another AI form filler appearing on GitHub with similar objectives.

Development Status:

• Superfill.ai: Active development with Product Hunt launch December 2025, Phase 1 complete, detailed roadmap
• Instafill.ai: GitHub organization with 4 repositories but less clear public presence

Community \& Documentation:

• Superfill.ai: Active Product Hunt presence (89 upvotes), Hacker News feature, comprehensive documentation, blog content
• Instafill.ai: Less publicly documented features and community engagement

When to Choose Superfill.ai: For active community, transparent roadmap, proven Product Hunt validation, and comprehensive documentation.
When to Choose Instafill.ai: Requires more research to determine differentiation and current status.

Superfill.ai vs. JobFill.ai / FillGenius

JobFill.ai and FillGenius are AI-powered form fillers with varying specializations.

Scope:

• Superfill.ai: Universal form filler with multi-use case support (jobs, dating, rentals, surveys)
• JobFill.ai: Appears specialized for job applications based on branding
• FillGenius: General form filler with simpler value proposition

Technical Transparency:

• Superfill.ai: Open-source with detailed technical architecture (React 19, TypeScript 5.7+, WXT Framework, Vercel AI SDK)
• JobFill.ai/FillGenius: Closed-source with limited technical documentation

When to Choose Superfill.ai: For open-source transparency, multi-AI provider support, universal compatibility, and BYOK privacy control.

Superfill.ai vs. Browser Native Autofill

Browser Native Autofill (Chrome, Firefox, Safari built-in) provides basic form-filling through saved addresses and payment information.

Intelligence:

• Superfill.ai: AI-powered contextual understanding with adaptive rephrasing and confidence scoring
• Browser Native: Simple field-name matching with no contextual understanding

Scope:

• Superfill.ai: Handles complex essay questions, skills descriptions, custom fields with AI-generated contextually appropriate responses
• Browser Native: Limited to basic fields (name, address, phone, email, payment info)

When to Choose Superfill.ai: For complex forms requiring custom answers, contextual adaptation, and when basic contact info auto-fill is insufficient.
When to Choose Browser Native: For simple contact forms when only basic information is needed with zero setup.

Final Thoughts

Superfill.ai is a promising and innovative tool that tackles a common frustration with a uniquely intelligent approach. By combining the security of local storage with the power of modern AI through multi-provider LLM integration, it offers a glimpse into a future free from the drudgery of repetitive form-filling.

The December 3, 2025 Product Hunt launch (89 upvotes, 11 comments) and Hacker News feature demonstrate strong market validation for AI-powered form automation. The open-source foundation (MIT license on GitHub) and commitment to keeping core features free forever builds trust and enables community-driven improvements that proprietary alternatives cannot match.

While it’s still in its early stages (Phase 1 complete with Phase 2 features like select/radio/checkbox fields, Safari support, and cloud sync in development), its powerful core features make it a project to watch. The BYOK model with AES-256 encryption, local-first storage, and zero telemetry addresses critical privacy concerns while providing cost transparency and model flexibility.

If you’re looking to supercharge your productivity and reclaim countless hours spent on job applications, dating profiles, rental forms, or surveys, Superfill.ai is definitely worth a try. The extension particularly excels for:

• Job seekers applying to dozens of positions weekly with repeated information requests
• Freelancers handling repetitive client intake forms and onboarding questionnaires
• Dating app users creating profiles across multiple platforms with similar questions
• Renters navigating multiple housing applications with identical information requirements
• Privacy-conscious users requiring open-source transparency and local-first data control

However, prospective users should consider: the BYOK model requires API keys and associated costs from providers (typically pennies per form but not zero); the technical setup may intimidate non-technical users; Phase 1 limitations mean advanced field types aren’t yet supported; and early-stage status may include occasional bugs.

For users comfortable with API concepts and willing to invest initial setup time in exchange for massive long-term time savings, intelligent contextual adaptation, and uncompromising privacy through open-source transparency, Superfill.ai represents a compelling solution to one of the internet’s most persistent annoyances. The combination of local-first architecture, multi-AI provider support, and community-driven development positions it uniquely in the form-filling space as a privacy-respecting, intelligent alternative to both basic browser autofill and closed-source commercial solutions.