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

How does xopt evaluate my post?

Accepted Answer

xopt runs 14 weighted checks based on X’s recommendation algorithm covering text length, media presence, content safety, readability, hashtags, mentions, emoji usage, sentiment, and more. Each check is classified as high, medium, or low impact. Results are grouped by severity — things to fix, things to improve, and what’s already working — with a compound penalty if multiple checks fail.

Question 3

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 4

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 5

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 6

How does the AI rewrite feature work?

Accepted Answer

After scoring, click “Improve with AI” to get an optimized version. The AI makes minimal edits — fixing only the issues flagged in your analysis while preserving your voice, tone, and meaning. It can also find trending hashtags related to your topic. Results stream in real-time so you see the rewrite as it’s generated. Powered by Anthropic’s Claude.

Question 7

Does the AI rewrite change my voice or tone?

Accepted Answer

No. xopt uses a minimal-edit approach — it changes as few words as possible to fix the issues flagged in your analysis. Your vocabulary, slang, humor, sarcasm, and opinion intensity are preserved. The AI is specifically trained to avoid generic phrases like “Here’s the thing” or “Let’s dive in.”

Question 8

What is the trending hashtag feature?

Accepted Answer

When you rewrite with AI, xopt can search the web for hashtags currently trending around your topic. Suggestions appear as interactive pills — tap to add or remove them. The tool respects X’s 280-character limit, so hashtags that would push your post over the limit are automatically disabled.

Question 9

Can I analyze replies, quotes, and threads?

Accepted Answer

Yes. Use the post type selector to choose between original post, reply, quote, or thread. Each type is scored differently — for example, replies are evaluated with different expectations for length and engagement signals since X’s algorithm weights reply engagement (especially quote tweets) heavily.

Question 10

Is my post data sent to a server?

Accepted Answer

Scoring runs entirely in your browser — your draft never leaves your device. If you choose to use the AI rewrite feature, your post text and analysis results are sent to Anthropic’s API to generate suggestions. This only happens when you click ‘Rewrite with AI’.

Question 11

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 12

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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