Jev Ultrafast
Overview
Open-source browser agent that maps page elements to typed actions for goal-driven web automation.
Jev Ultrafast is an open-source browser agent from the browser-use GitHub organization. It turns each browser observation into an indexed element table, lets a policy choose a supported operation and compatible target, and uses a small language model only when text needs to be typed. The project is aimed at developers experimenting with goal-driven browser automation, browser-agent research, and fast web-task execution workflows.
AI Agent Store research
What the evidence says about Jev Ultrafast
Jev Ultrafast is a public GitHub project for a browser agent that uses a dynamic, indexed action space. Its distinctive design is that each observation creates an element table, the policy selects from supported operations and compatible targets, and text generation is reserved for TYPE_TEXT actions rather than driving every step with free-form language.
Verified September 22, 2026
Verified capabilities
- Dynamic indexed action space
Each browser observation produces a new element table with numbered elements, allowing the agent to select an operation and a compatible target.[1]
- Typed browser operations
The README lists supported operations including CLICK, TYPE_TEXT, SELECT, SCROLL_UP, SCROLL_DOWN, WAIT, DONE, and BLOCKED, with only supported operations and targets offered.[1]
- Text generation only for typing
The project description says a small language model writes text only when the selected operation is TYPE_TEXT.[1]
- Local demo and inspector
The README describes running the project with uv, opening a local web interface, and using an inspector that shows numbered elements, probabilities, and executed actions.[1]
- Browser Harness integration
Chrome connects through Browser Harness, which the README says is installed by uv sync, with a doctor command available for connection checks.[1]
Where it fits best
- Developers building or studying goal-driven browser agents that choose operations and page elements from a structured action space.[1]
- Teams that want a local demo workflow for observing numbered page elements, operation probabilities, target probabilities, and executed actions.[1]
- Researchers comparing browser-agent designs that limit execution to supported operations such as CLICK, TYPE_TEXT, SELECT, scrolling, WAIT, DONE, and BLOCKED.[1]
Buying and deployment notes
The repository is public and shows an MIT license in the supplied GitHub context. No separate paid pricing for the open-source repository is published in the supplied context.[1]
Platforms: GitHub, Local development environment, Chrome via Browser Harness[1]
Deployment: Open-source repository, Local run with uv, Cloud waitlist[1]
Important considerations
- The README indicates setup requires copying an environment file and adding TYPESAFE_API_KEY and TEXT_MODEL_API_KEY, so evaluation depends on access to those required keys.[1]
- The Browser Use Cloud version is described as an early-access waitlist, so cloud access is not presented as generally available in the supplied official context.[1]
- The supplied official page shows a young repository snapshot with 3 commits, which is a practical adoption consideration for teams that require mature release history.[1]
Sources and research method (1)
We record only claims tied to public sources checked by our team or listing workflow. Counts above are derived directly from this profile, not a subjective rating.
- GitHub - browser-use/jev-ultrafast: Fastest and cheapest web agentGitHub · checked 2026-09-22
Autonomy level
50%
Comparisons
Custom Comparisons
Some of the use cases of Jev Ultrafast:
- Building browser automation agents
- Testing goal-driven web navigation workflows
- Researching dynamic action spaces for web agents
- Running local browser-agent demos
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