A real browser · macOS and Linux
ACID Browser is Chromium with an agent built into it. Give it a job in plain language and it opens the tabs, reads the pages, fills the forms, makes the accounts, and keeps going for hours while you're away. Take the controls back whenever you want.
Free to download. $5 of compute to start. No card required.
"Find the ten most interesting new open-source AI browser projects and compare them."
92 candidates found · 30 qualified · deduplicated across 4 sources
Agent framework driving a real browser through structured page state.
Vision-driven workflow automation over live websites.
Headless browser API purpose-built for agent workloads.
Minimal browser engine aimed at automation, not humans.
Why this one
Browser automation usually demos well and then quits the moment a site asks it to make an account, solve a challenge, or come back with a code from an inbox. ACID Browser is built around finishing those parts, because they are most of the work.
Registration forms, email confirmation, passkey creation. It reads the verification code out of your inbox and carries on instead of stopping to ask.
It has filed over two hundred job applications on one objective, across sites that each wanted something slightly different, without being restarted.
Real Chromium, real input, your profile. Pages see a browser being used, because that is what is happening.
Submitting TestFlight builds, publishing to the Play Store, setting up beta groups, collecting contract opportunities. Work that ends in something shipped, not a summary.
The harness is inside the browser, so ACID can run its own objectives or be driven by an agent you already use. Both paths are first class.
You download a browser. Nothing is hosted for you, nothing renders on a scraping farm, and your logged-in sessions never leave your computer.
How it works
No model picker. No API keys. No provider setup. You describe an outcome; ACID plans it, opens the tabs, and reports back.
Plain language. "Compare these five suppliers." "Watch this listing and tell me when the price drops."
ACID breaks the job down and spins up subagents, each with its own browser, working in parallel.
Real pages. Real clicks. It reads, scrolls, fills forms, signs in where you've allowed it, and runs code when that's faster.
A report, a dataset, a decision, plus exactly what it cost. Step in and take over at any moment.
Capabilities
Jobs that take minutes or hours don't need you watching. ACID keeps state, recovers from crashes, and picks up where it left off.
One objective becomes many workers, each in an isolated browser, so four sources get read at once instead of one after another.
Sign in once. ACID keeps sessions, cookies and passkeys in an encrypted vault, scoped per site, and never shows secrets to a model.
Watch it work live. Grab the mouse whenever you like, do the tricky bit yourself, and hand control straight back.
The browser is real and it's yours. Pages render locally, in your Chromium profile, not on somebody's scraping farm.
Start a job at your desk, check it from your phone. Same account, same tasks, same balance.
Desktop and mobile
Tasks live on your account, not in a tab you have to keep open. ACID tells you when something needs a human. A verification code, a decision, a paywall. It waits for you instead of guessing.
Everything else, it just finishes.
Compare inference GPU pricing across four vendors
Pricing
Every plan starts with $5 of compute and no card. What you pick decides how much ACID can take on at once, and how far it can reach when a job turns out to be harder than it looked.
Every plan includes $5 to start, no card required. Monthly allowance renews; credits you buy outright are yours for good.
No subscription. Your balance is in dollars, and running a task draws it down based on the compute the work required. You never have to think in tokens.
| Quality | Per job | Jobs per $5 |
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Download
Create an account first and your browser activates itself. No keys to copy.
The macOS build is signed and notarized by Apple, so it opens without a warning. The Linux archive is an alpha carrying a detached OpenPGP signature; download the signature from /download/linux.asc and our public key, then verify with gpg --verify against fingerprint 09A6257E 47C9A019 757AA8CF 72FEE824 8A7B81BE before extracting. To check any download, run shasum -a 256 on it and compare.
Questions
It is a browser. You download ACID Browser and run it like you would run Chrome. It is Chromium, with the agent built into the browser itself rather than bolted on as an extension or a separate harness driving something headless. There is nothing to install into a browser you already have.
It runs on your machine. Pages render locally in your own profile. The only thing on our servers is inference and your credit balance; your tabs, sessions and files stay on your computer.
Yes, and that is the point, but it is deliberately narrow about how. You save a credential to an encrypted vault on your machine and grant it per site. ACID fills it directly into the page without the value ever being put into a prompt or shown to a model, so a password is not something the agent can repeat, leak into a log, or type on the wrong domain. It can also create accounts and passkeys of its own, and read a one-time code out of your inbox when a site demands one. Anything it cannot do safely, it stops and asks you.
It depends on how much work it is. Reading a handful of pages and writing a summary is usually a few cents. A long investigation across dozens of sites with several subagents might be a dollar or two. Every task shows its cost when it finishes, and you can see the breakdown any time.
No. ACID handles inference for you and bills it to your credit balance. If you'd rather run your own models, whether Ollama, LM Studio, vLLM, or any OpenAI-compatible endpoint, you can, under Settings → Advanced → Inference. That's a power-user option, not a requirement.
Yes. ACID is a Chromium browser that runs on your machine with your profile. Pages render locally. You can watch every action, take the controls mid-task, and stop it whenever you want.
ACID finishes anything it can safely finish, saves the task state, and asks you to top up. Nothing is thrown away. Add credits and the work continues from where it paused.
Credentials live in an encrypted vault on your machine, scoped to the sites you allow. Secrets are never shown to a model and never leave your device in a prompt. When a site needs a human, a verification code say, ACID stops and asks you rather than pretending.
They don't expire, and nothing recurring is switched on by default. Optional auto top-up exists for people who want it, and only after they explicitly turn it on.
Autonomous Computer Interface Daemon. The daemon part is the old sense of the word, a process that quietly gets on with work in the background. It turned out to make people picture something headless on a server, which is the opposite of what this is, so the product is called ACID Browser.
A browser that works while you don't. Free to download, $5 of compute to start, no card.
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ACID Browser