MultiOn fits developers who want an AI product to actually act on the web, not just answer questions about it, plugged in through a LangChain and LlamaIndex-ready API. It replaces browser scripts tied to CSS selectors that break on every site redesign. Individual users get the same engine free through the AGI-0 app, backed by $50 million in funding.
MultiOn is a browser-native AI agent that controls a real Chrome session, supporting millions of concurrent agents through its API, and clicks, fills, and submits on live websites instead of working from a static snapshot. Its ACE engine reads buttons and forms visually, so a site redesign doesn't break it. AGI-0, launched in 2026, carries that same engine to phones.
Maker: AGI, Inc. · Autonomy: semi autonomous · Maturity: GA
Underlying models: Model-agnostic: Claude, Gemini, Grok, Custom ACE (Autonomous Cognition Engine)
About MultiOn
MultiOn is a browser-native AI agent built by AGI, Inc., founded in 2022 by Div Garg and Omar Shaya after they met at Stanford. The company has raised $50 million, including a $20 million Series A led by General Catalyst in June 2024, with additional backing from Lightspeed Venture Partners, Amazon Alexa Fund, Samsung Next, and angel investors Daniel Gross and Nat Friedman. Rather than answering from a static knowledge base, MultiOn controls a real browser session to act on the live web: logged-in accounts, current inventory, and forms that change from one visit to the next. MultiOn reaches the web through three products: a Chrome extension for individual users, a REST API with Python and JavaScript SDKs for developers, and AGI-0, a mobile app the company introduced in 2026 to carry the same agent onto phone browsers and installed apps. OpenAI shut down Operator, a rival browser agent, in August 2025 after it struggled on JavaScript-heavy sites, leaving MultiOn with one less major API competitor in the category.
Pricing
API pricing isn't published anywhere on MultiOn's site; you contact the sales team directly for a quote, and terms may include per-session or volume-based components. The Chrome extension and the AGI-0 mobile app are free downloads. Developer API access requires a paid plan, with custom enterprise terms available on request.
Key Features
- Autonomous Web Browsing: Controls real browser sessions to navigate websites, fill forms, make purchases, and complete multi-step web tasks using natural language instructions, with no per-step human guidance needed.
- Visual Page Understanding (ACE Engine): The proprietary Autonomous Cognition Engine reads web pages visually rather than by CSS selector, so it adapts automatically when websites redesign their layout and does not break.
- AGI-0 Mobile Agent: The AGI-0 mobile app (2026) navigates mobile web interfaces and switches between installed apps simultaneously, enabling tasks like booking rides or comparing prices directly on your phone.
- Developer API with Concurrent Scale: REST API with Python and JS SDKs lets developers embed web-action capability into any product, with support for millions of concurrent agent sessions and native LangChain and LlamaIndex integrations.
- Authenticated Session Access: Handles authenticated accounts via encrypted session credentials, allowing agents to act on social platforms, CRM systems, email, and e-commerce accounts that require login.
- Persistent Preference Memory: Remembers user preferences and past session context, reducing the need to re-explain recurring tasks and making the agent more efficient on familiar websites over time.
Strengths
- The ACE engine's payoff shows up over time: while automation tools tied to CSS selectors need a rewrite after a site redesign, MultiOn keeps working without one.
- The LangChain and LlamaIndex integrations are officially maintained, not community forks, which matters if you're weighing this against agent frameworks that only offer unofficial connectors.
- Backed by General Catalyst, Lightspeed Venture Partners, and Amazon's Alexa Fund, MultiOn has investor credibility that's rare for a company this size, which helps when evaluating vendor stability for a multi-year integration.
- AGI-0 is one of the few mobile agents that can hand off between the mobile browser and installed apps in the same task, a gap browser-only competitors like Browserbase haven't closed.
Weaknesses
- You can't get a real number for API costs without a sales call, which makes it hard to compare against competitors with public pricing pages.
- MultiOn isn't a fit for enterprise workflows that need deep audit trails, database-level integration, or strict compliance controls beyond what happens inside the browser.
- A roughly 29-person team is thin next to the well-funded infrastructure competitors racing to build the same browser-automation layer at scale.
- The AGI-0 mobile app launched in 2026 and is still rough around the edges: minor bugs remain, and the experience trails the more mature Chrome extension.
Frequently Asked Questions
What does MultiOn actually cost?
MultiOn doesn't list a public price for its developer API; you get a quote after talking to sales, and rates can vary by task volume or session count. What's free is the consumer side: installing the browser extension or the AGI-0 phone app costs nothing. Paying only comes in once you need the API at scale, and enterprise customers can negotiate custom terms.
Does MultiOn have a free plan?
MultiOn's browser extension and its AGI-0 phone app both install at no cost for personal use. There's no published cap on how much you can do with them for free, though heavy users may eventually hit an undisclosed limit. The developer API is a separate paid product and currently has no free tier of its own.
Which tools compete with MultiOn in 2026?
MultiOn's closest competitors are Manus, HyperWrite, and TinyFish. Manus handles longer, multi-step research and build workflows in an async cloud sandbox rather than live browser clicks. HyperWrite pairs a similar browser agent with an AI writing assistant, useful if you want both in one subscription. TinyFish targets enterprise buyers who need web-agent infrastructure across hundreds of sites rather than a single Chrome extension.
What separates MultiOn from Manus?
MultiOn acts inside a live browser session in real time: clicking, filling forms, and completing a purchase on today's version of a page. Manus instead works asynchronously in a cloud sandbox with a much wider tool set, including coding and data analysis, and leads the GAIA agent benchmark for long-horizon tasks. MultiOn's edge is its native LangChain and LlamaIndex integrations, which suit teams already building agent pipelines around those frameworks. Manus's edge is breadth: one workflow can research, write code, and produce a finished deliverable without switching tools.
How do you set up MultiOn?
Individual users install the Chrome extension or the AGI-0 mobile app and sign in, which gives the agent access to the accounts it needs; both installs are free. Developers go through the REST API with the Python or JavaScript SDK, or plug in via the maintained LangChain and LlamaIndex toolkits if they already run an agent pipeline in one of those frameworks.
Top Alternatives
- Manus: Pick MultiOn if you need a specific web task done in a live browser session; pick Manus if you need a multi-step research or build workflow handled end-to-end.
- HyperWrite: Pick MultiOn for its ACE vision engine and enterprise-scale concurrent API; pick HyperWrite if you also want an AI writing assistant with sentence-level autocomplete bundled in.
- TinyFish: Pick MultiOn for browser-level automation with a Chrome extension and mobile app; pick TinyFish if you need enterprise infrastructure built specifically for automating workflows across hundreds of sites.
HokAI guides covering MultiOn
- Best AI Agents in 2026: Autonomy Level Matters More Than Benchmarks: Best AI agents in 2026, compared by autonomy level and domain fit instead of benchmark score, with real pricing for Claude Code, Jules, Fugu, and Artisan.