BrowserOS vs FillApp

BrowserOS is an open-source Chromium-based browser with AI agents for carrying out web tasks from natural-language directions. The agents can navigate, click, type, fill forms, extract data, and run workflows across multiple steps. Chat Mode answers questions about the page in view; visual Graph Mode for repeatable workflows is marked as coming soon. BrowserOS supports Gemini, Claude, OpenAI, and local models through Ollama or LM Studio. Its maker lists more than 40 MCP app integrations, including Gmail, Slack, Notion, and Calendar, as well as 53 built-in browser tools. An included MCP server connects with Claude Code, Gemini CLI, or Codex. As a Chromium fork, it supports Chrome extensions and import of Chrome bookmarks, passwords, and settings. Browsing data stays on-device unless cloud syncing is enabled; syncing is off by default, and synced activity is encrypted on BrowserOS servers. BrowserOS says it does not store or log AI prompts or responses, though providers may handle submitted data under their own policies. It is free and licensed under AGPL-3.0.

FillApp is a paid AI agent for completing web and PDF forms with saved information or custom instructions, and for automating browser workflows in existing sessions. Fill Mode handles forms, Agent Mode performs multi-step work across tabs, and Assist Mode summarizes pages, PDFs, and images or answers questions about them. Supported fields include text, dropdowns, checkboxes, dates, and long text blocks. Saved datasets become reusable snippets inserted with @SnippetName. The agent can request confirmation before risky actions such as submitting forms or deleting data. Named integrations include Google Forms, Microsoft Forms, Salesforce, HubSpot, Jotform, Airtable, Workday, Greenhouse, Atlassian, and ServiceNow. FillApp is available as a browser extension and web app. It says page content is accessed when a conversation or agent engagement starts, not monitored in the background. Prompts and needed context may be sent to OpenAI and Anthropic. Chat sessions clear after the session, while account and snippet data remains until deletion or one year of inactivity. Starter costs $14.99 a month; Pro costs $29.99 a month. A 7-day trial is listed.