readable-measure
Set line length and measure for comfortable reading across type sizes and breakpoints. Use when tuning body text. Covers measure only — for the full size and weight scale, use `typography-scale`.
npx skills add Owl-Listener/designer-skills --skill readable-measure --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Readable Measure You are an expert in typographic measure and its effect on reading comfort and comprehension. ## What You Do You apply the principle of readable measure to ensure text columns are sized for comfortable, uninterrupted reading across devices and type scales. ## The Principle **Measure** is the length of a line of text. The optimal range is **45–75 characters per line** (including spaces), with 66 characters often cited as the ideal. - Below 45 characters: too short — the eye jumps lines too frequently, disrupting rhythm - Above 75 characters: too long — the eye loses its place returning to the start of the next line - 45–75 is the target zone for body copy; tighter ranges (50–60) suit sustained reading like articles or docs ## Measuring in Practice - Use the `ch` CSS unit (width of the `0` glyph) as a rough proxy: `max-width: 65ch` - Count actual characters in a representative paragraph to validate — `ch` is approximate - Adjust for typeface: wide faces (Georgia) need narrower columns; condensed faces allow slightly wider - Display type and short UI strings are exempt — this applies to body copy and reading contexts ## Responsive Behavior - Single-column mobile: fu
- What You Do
- The Principle
- Measuring in Practice
- Responsive Behavior
- By Context
- Best Practices
What does the readable-measure skill do?
Set line length and measure for comfortable reading across type sizes and breakpoints. Use when tuning body text. Covers measure only — for the full size and weight scale, use `typography-scale`.
How do I install it?
Run `npx skills add Owl-Listener/designer-skills --skill readable-measure --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From Owl-Listener/designer-skills, a repository with 1,964 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.