Question 1

What is xopt and how does it work?

Accepted Answer

xopt is a free client-side tool that analyzes your X (Twitter) post drafts against signals derived from X’s open-source recommendation algorithm. You paste your draft, choose a media type, and get an instant score with actionable tips — all without leaving your browser.

Question 2

What signals does X’s algorithm use to rank posts?

Accepted Answer

X’s recommendation algorithm uses a two-stage pipeline. The Light Ranker filters candidates using text quality, media presence, URLs, and author reputation. The Heavy Ranker then scores ~6,000 features including engagement history, community embeddings (SimClusters), and content safety signals.

Question 3

What is the ideal post length for X’s algorithm?

Accepted Answer

Posts between 91 and 210 characters tend to perform best. This range is long enough to convey substance and generate engagement, but short enough to display fully in timelines without truncation.

Question 4

Does adding media improve my post’s ranking?

Accepted Answer

Yes. The Light Ranker uses media presence (images, videos, and cards) as a positive feature. Posts with visual content consistently receive higher engagement, which in turn boosts Heavy Ranker scoring through engagement-based labels.

Question 5

How is the overall score calculated?

Accepted Answer

xopt runs 14 rules, each returning a score (0–100) and a weight. The overall score is the weighted average of all rule scores, with a compound penalty applied when multiple rules fail: ×0.8 for 2–3 failures, ×0.6 for 4 or more.

Question 6

Is my post data sent to a server?

Accepted Answer

No. All analysis runs entirely in your browser using JavaScript. xopt has no backend, no API routes, and no database. Your draft text never leaves your device.

Question 7

How accurate is xopt compared to X’s actual algorithm?

Accepted Answer

xopt is an approximation based on publicly available information from X’s open-source recommendation algorithm. It captures the key signals that influence ranking — text quality, media, engagement potential, safety — but cannot replicate personalized features like your follower graph or engagement history.

Question 8

Is xopt affiliated with X Corp?

Accepted Answer

No. xopt is an independent project. It references X’s open-source recommendation algorithm (published on GitHub) but is not endorsed by, affiliated with, or sponsored by X Corp.

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