Moli by Lexmount - The fastest headless browser for agents and harnesses
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Moli by Lexmount is our browser engine built from scratch for AI agents. It starts faster and uses less memory than Chrome.
Use Moli through Lexmount Browser, our cloud browser platform. Run multiple isolated browser sessions with proxy support while we handle the infrastructure. Let your agents browse, fill out forms, and extract data. Try it in our Playground or connect through our SDK.
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Hey Product Hunt 👋
I’m Quinn, one of the builders behind Moli by Lexmount.
Moli is the fastest headless browser for agents and harnesses. It’s the custom-built engine powering the Lexmount Browser platform, helping your agents and harnesses run faster at a lower cost.
If you’re building agents and harnesses for research, data collection, or web automation, this is for you.
✍️ Here’s how to build with Moli：
Try it in our playground to verify your credentials and inspect the browser before coding.
Or use our SDK to control real cloud browsers with support for Playwright, CDP, extensions, proxies, downloads, and session replay.
Run real web tasks and get verifiable results, like a CSV with source links.
Why use Moli by Lexmount:
Faster starts and less memory：Moli cold-starts around 5× faster than Chrome while using roughly 1/7 of the memory in our benchmarks.
Less infrastructure work: We handle browser setup and management.
Cloud scalability: Run multiple Moli-powered browsers simultaneously with cloud networking and proxy support.
Lower costs: 100 browser hours and 25 concurrent sessions for $12/month.
🎉 To celebrate our launch, Product Hunt users get 2 months of Moli by Lexmount Pro free. Click “https://browser.lexmount.com/?ref=producthunt” and sign up to claim your offer.
We’ll also be sharing more perks and giveaways on Discord soon：https://discord.gg/95QXqbsgVu.
Come share what you’re building and try Moli by Lexmount with us 🚀
@new_user___0524xieqiqi Congrats on the launch quinn Can Moli handle tasks across multiple browser session at once?
@shivam_kushwaha16 Since Moli is lightweight enough, you can easily launch multiple Moli instances to handle multiple browser sessions. Moli provides the ability to specify browser contexts.
If you've built enough agent workflows, you know that spinning up headless browsers can quietly become the most expensive part. If you're running thousands of headless Chromes, the resource costs keep climbing (just think of how your laptop fans keep spinning up). Moli by Lexmount was purpose-designed to consume a mere 1/7 of Chrome’s idle memory, which directly results in lower costs.
If you’re building a harness like Hermes or a browser layer for a coding agent like Codex, this is worth a look.
Moli is an open-source browser engine built for agents, not an agent wrapper. You can use it locally or through Lexmount’s cloud offering.
Start in the playground: connect your account, run a real web task, then inspect what happened. You can move to the SDK once you know how it behaves in your workflow. See how speed and costs compare rather than relying on any of the claims on the slides above!
@chrismessina Thanks, Chris! 🙌
That's exactly why we built Moli from scratch. Traditional browsers like Chrome were designed for humans, but AI agents have very different needs.
By building a browser engine specifically for agents, we've reduced unnecessary overhead, achieving around 5× faster cold starts and using just 1/7 of Chrome's idle memory in our benchmarks.
With Lexmount Cloud Browser, developers can take advantage of this efficiency at scale without having to manage browser infrastructure themselves.
Excited to see what developers build with Moli! 🚀
@chrismessina Interesting that it uses so little memory compared to chrome on the launch
@chrismessina @shivam_kushwaha16 Thanks, Shivam! 🙌
That's one of the key reasons we built Moli from scratch. Chrome was designed for human browsing, while Moli is purpose-built for AI agents. By eliminating unnecessary overhead, we've reduced idle memory usage to around 1/7 of Chrome's in our benchmarks.
This makes a huge difference when you're running dozens or even hundreds of browser sessions simultaneously, especially in terms of infrastructure costs! 🚀
Hi everyone! I’m Donough Liu, one of the makers of Moli by lexmount.
One thing we’ve been deliberate about while building Moli: making it lightweight and headless shouldn’t come at the expense of browser security.
We’ve put substantial work into browser security (including same-origin restrictions, iframe sandbox restrictions, CSP, CORS, subresource integrity, MIME-type enforcement, and Referrer Policy..). These protections matter just as much when an AI agent is browsing as when a person is. 👻
That work rarely shows up in a demo, but it’s a core part of making Moli production-ready. Real-world automation needs a browser that respects the web’s security boundaries, alongside speed and efficiency. We’re building Moli with all of those responsibilities in mind.
@ldm0 Great point, Donough! Speed and efficiency matter, but security is just as important. Thanks for highlighting the work behind the scenes!
Congrats on launch! This is a interesting combination of open-source tech and cloud infrastructure
@sandy_liusy Thanks, Sandy! We're bringing open source and cloud together to make it easier for developers to build AI agents.
Congrats on the launch！Moly by Lexmount looks very promising！
@1067510683 Thanks, Ying! We're excited to bring Moli to more developers through Lexmount Cloud Browser!
Love seeing a browser built specifically for AI agents!
@jackruirui Thanks! We believe AI agents deserve browsers built specifically for their needs, and that's exactly why we created Moli.
What inspired you to build Moli from scratch?
@yinn1014 We originally ran our agent workloads on Chrome, but it wasn't always fast or lightweight enough for the job. With nothing better on the market, we built our own headless browser designed for light workloads.
Hi everyone! 👋 I’m Julia, COO at Lexmount.
My focus is helping developers take Moli from “this looks interesting” to something useful in their own workflows.
We’d love to hear what you’re building—whether that’s a research agent, a data collection pipeline, or browser automation—and what’s making the browser part difficult today.
If you try Moli and hit a roadblock, please share it here. Our team is around to help, and your feedback will help us decide what to improve next.
What’s one browser task you’d like to try with Moli?
@julia_zhu4 Thanks, Julia! Excited to see how developers use Moli in real-world workflows. Looking forward to hearing their feedback and ideas!
Can I use Moli by Lexmount without setting up my own servers?
@evanbuildsai We offer a cloud-hosted, one-click experience that integrates directly with a wide range of existing tools.
You can try Moli here. https://browser.lexmount.com/playground
Does Moli support modern web standards?
@romy_chou Yes! Moli supports modern web standards and can replace Chromium for most browser automation workflows, including Playwright and Puppeteer. Some downstream projects already use Moli to test frontend frameworks, too, with a much lighter resource footprint.