Jev Ultrafast
A browser agent project that employs dynamic indexed action space technology. By constructing a real-time updated structured index of interactive page elements, it improves the execution speed and reliability of browser automation tasks.
Timeline (last 90 days)
Jev's semantic filtering approach compresses the number of tokens fed into the model to a few percent of the full DOM, but at the cost of being unable to recognize Canvas controls, Shadow DOM nodes, and similar elements.
GIV, the core model responsible for click decisions in Jev, currently can only go through the TypeSafe official remote interface and cannot run fully offline.
When Jev needs to input text, it calls a text model; the default configuration uses OpenRouter, which can be replaced with a local OpenAI-compatible service.
Jev supports the following action types: click, input, select, scroll, wait, and end.
Jev tends to get stuck halfway when encountering Shadow DOM, Frame, Canvas, file uploads, new tabs, nested scrolling, or complex keyboard operations.
In the official recording, Jev Ultrafast completed the operations of opening Google Flights, entering Zurich and London, selecting one-way, and finding flights in 7.073 seconds.
Jev Ultrafast is an open-source browser Agent project released under the MIT license.
As of September 22, 2026, the Jev Ultrafast project had received 15,975 stars.
Jev's core mechanism is to extract and number the currently interactive elements into a list, having the model only answer what to do and which number to select, rather than guessing coordinates or writing selectors.
Jev only extracts elements that are in an interactive state within the current viewport (such as button, input, select, [role=button]), ignoring purely presentational nodes.
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All Facts (14)
Jev's semantic filtering approach compresses the number of tokens fed into the model to a few percent of the full DOM, but at the cost of being unable to recognize Canvas controls, Shadow DOM nodes, and similar elements.
50%UnverifiedJev supports the following action types: click, input, select, scroll, wait, and end.
50%UnverifiedJev tends to get stuck halfway when encountering Shadow DOM, Frame, Canvas, file uploads, new tabs, nested scrolling, or complex keyboard operations.
50%UnverifiedIn the official recording, Jev Ultrafast completed the operations of opening Google Flights, entering Zurich and London, selecting one-way, and finding flights in 7.073 seconds.
50%UnverifiedJev Ultrafast is an open-source browser Agent project released under the MIT license.
50%UnverifiedJev's core mechanism is to extract and number the currently interactive elements into a list, having the model only answer what to do and which number to select, rather than guessing coordinates or writing selectors.
50%UnverifiedJev only extracts elements that are in an interactive state within the current viewport (such as button, input, select, [role=button]), ignoring purely presentational nodes.
50%UnverifiedAfter optimization, Jev's median time for the same flight query dropped from 9.450 seconds to 7.092 seconds, a reduction of approximately 25%.
50%UnverifiedAfter optimization, Jev's browser protocol (CDP) calls dropped from 1,092 to 101, and TypeSafe requests dropped from 22 to 17.
50%UnverifiedBefore executing an action, Jev re-checks whether the page has changed, whether the target is still present, and whether the button is obscured by a popup; if there is a mismatch, it discards the action and re-reads the page.
50%UnverifiedGIV, the core model responsible for click decisions in Jev, currently can only go through the TypeSafe official remote interface and cannot run fully offline.
50%UnverifiedWhen Jev needs to input text, it calls a text model; the default configuration uses OpenRouter, which can be replaced with a local OpenAI-compatible service.
50%UnverifiedIndexed action space builds a structured index of page elements, allowing the agent to quickly locate target actions as if looking up a dictionary, rather than traversing from scratch each time.
50%UnverifiedJev Ultrafast is a browser agent project that adopts a dynamic, indexed action space design.
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