1. Search intent first
The initial site architecture is built around long-tail queries such as “what size round brush should I use,” “what size round brush for bangs,” “what size round brush for blowout,” and “round brush size chart.” The goal is to answer the searched question in the first useful block, then offer a deeper personalized method.
2. Diameter instead of brand numbering
Numbered brush sizes are not universal across manufacturers. The site therefore expresses recommendations as approximate diameter bands in millimeters and treats them as starting points rather than absolutes.
3. Length + goal determine the starting range
Hair length sets a practical control range because the section must engage with the barrel. Styling goal then shifts the range: looser volume typically moves larger, while more bend or front-section control moves smaller.
4. Technique remains adjustable
The method engine changes sectioning and action steps based on density, texture, experience and available time. These variables are used to make the routine more practical, not to make medical or diagnostic claims about hair.
5. Community data is descriptive
If community mode is enabled, anonymous selections can be aggregated to show what users choose. Display names are kept on the user’s device and are not part of the shared row. Community patterns do not override the individual method.
Evidence reviewed
The initial research compared the formats and questions surfaced by current search results, including manufacturer/editorial size guides and tutorials. The site deliberately does not copy competitor product rankings.
- Termix — brush diameter guide according to hair length
- HairCareCN — round brush size guide
- Round brush sizing / technique video surfaced in SERP research
Review date: August 12, 2026. The site should be rechecked against current manufacturer guidance and search intent as the project evolves.