Does this upload my whole timeline somewhere?

It sends post text to the Jev endpoint only, with the key held in local extension storage by the service worker. There is no server and no analytics, and promoted or textless posts are never sent.

If I tune thresholds will it rebill all my scrolling?

Change wording, levels, or model and the cache drops, but changing thresholds, labels, or direction is display-only and costs nothing. Scrolling back or reloading reuses cached post-id results.

Will a fast scroll past fifty posts bill fifty calls?

At most six requests fly at once and the rest queue in order, while posts that scroll out before their turn are dropped. Set look-ahead to zero with a short wait to pay only for posts you stop on.

Can I trust the default labels in another language?

No. English is where accuracy is best and other languages are handled less well. Post text goes in as written, so run calibration on your own samples before trusting defaults elsewhere.

How do I install x-scanner before it reaches the store?

You need Chrome 120 or newer and Node 22 or newer to build. Clone the repo, run npm install and npm run build, open chrome://extensions, enable Developer mode, click Load unpacked and select the dist/ folder, then paste your TypeSafe API key and Test connection.

What does a single post actually cost to analyze?

Measured on 2026-09-18 with jev-1.13.0 over 18 sample posts: about 906 input tokens per post, roughly 720 of them the six questions themselves, at $0.000038 per post or $0.038 per 1,000. Average latency is 174 ms, with a first call around 350 ms.

How does it handle rate limits and failures?

It follows the official SDKs: 429 and 529 responses back off, and everything else fails fast. Results are cached by post id in extension storage, so scrolling back, reloading, or returning the next day re-bills nothing, and promoted or textless posts are never sent.

CommunityJev Demos & Experiments

X Scanner

Chrome extension that sends each X post to Jev with six typed questions in one call near the viewport, then renders a behavior chip under the post plus a session cost and latency panel.

See highlights

Open github.com

Stars: 23
Language: TypeScript
License: MIT
Published by: Community
Author: oso95
Last verified: Oct 2026

oso95/x-scanner

User repository on GitHub

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Chrome extension that labels every post you scroll past on X with typed Jev judgments and a live cost counter

Forks: 5
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

Behavioral labels on every post you scroll past on X, judged by Jev, TypeSafe's System One model, with a counter in the corner showing exactly what it cost.

Quoted from the project's README. Read the full README.

Tagscommunity jevbest catalog-import awesomejev

Works forJev for Classification Jev for Ranking

Used inJev for Software & DevTools

Languages: TypeScript

Highlights

Six questions per post in one call: fact density, engagement bait, promo, secondhand, filler, and a Jev-topic check.
Chips under each post with clean or flagged state plus a per-post card with bars, tokens, cost, and latency.
Corner panel with session posts, exact spend from returned token usage, latency, and judgments per second.
Editable dimensions, thresholds, model pinning, concurrency, look-ahead, caching, and scope controls.

Watch out

Jev reads literally, so adversarial phrasing can move an answer and thresholds default high for that reason. Selectors target current X markup and live in one file to fix, and English prompts are most accurate. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

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