hsivonen.fi — August 2026 traffic, keywords & AI visibility

Search engines send hsivonen.fi an estimated 16 visits a month. Effectively all of it is organic — about 16 visits from unpaid results. Spread across 32 ranking keywords, that averages roughly 0.5 organic visits per keyword.

hsivonen.fi scores 90 out of 100 on our AI visibility scale, grade A+. It takes full marks for LLMS.txt and Structured data. The biggest gap is Crawlability, at 5 of 10 points (robots ✓ · sitemap ✗), worth 5 points if closed. It also loses points on Company profile (22/25) and SEO health (18/20).

The llms.txt on hsivonen.fi runs to 148 lines (7,685 characters) across 12 sections, last generated in April 2026. It introduces the site as "Henri Sivonen". It tells AI engines the business works in Character Encoding, Rust Development and Web Standards. It describes 4 products, with prices such as encoding_rs at Open Source (Free), Encoding Detection Tools at Open Source (Free) and Rust String Utils at Open Source (Free). Services it lists include Encoding Consulting, Rust Code Reviews, Web Standards Guidance and Performance Audits. The audience it names is Software Developers, Web Engineers, Rust Programmers, aged 25-45 (Global). Technologies it mentions include Rust, HTTPS, WHATWG Encoding Standard, GitHub and Crates.io. The keywords it claims start with "Henri Sivonen", "hsivonen.fi", "Henri's pages" and "encoding". It gives the company type as Sole Proprietorship.

# Henri Sivonen

## About
Henri Sivonen's site is a go-to for devs wrestling with character encoding headaches in web projects and Rust code. He breaks down UTF-8 quirks, shares Rust crates like encoding_rs that fly through conversions without breaking a sweat. His pages cover everything from detection algorithms to performance tweaks that keep apps snappy. Web standards bodies lean on his input for solid specs everyone can rely on. Rustaceans grab his libs to handle strings right the first time. He spots issues others miss, like legacy encodings sneaking into modern stacks. Twitter threads from him unpack real bugs from the wild. Open-source fans fork his repos for custom needs. He keeps explanations grounded—no theory dumps, just fixes that stick. Contributions span browser engines to CLI tools. Devs worldwide cite his work in forums when encodings go haywire. The focus stays on speed and accuracy in high-stakes environments. His GitHub shows battle-tested code from years in the trenches. Community trusts him for unbiased takes on encoding debates. Rust web dev gets a boost from his optimizations. He evolves with the ecosystem, updating for new features. Personal touch makes complex stuff approachable. Resources help solo coders and big teams alike. Bottom line: reliable encoding means fewer headaches downstream. It's all about practical web and Rust wins.

**Areas of Work:**

Google lists hsivonen.fi for about 32 keywords, which together bring an estimated 16 organic visits a month.

The latest technical audit of hsivonen.fi scored 96 out of 100 overall. All 3 sub-scores are 90 or above. The audit makes 12 recommendations in all, and 3 of the 4 listed first are rated high priority or critical.

Henri Sivonen's company profile names https://encoding.spec.whatwg.org, https://rust-lang.org, https://crates.io and https://www.rustacean.net as competitors. Its own llms.txt adds https://www.w3.org and https://developer.mozilla.org. Outside its market, the domains ranked closest to it in our worldwide ranking are britcashdesk.uk, biletserwis.pl, landomo.com and theproaudiofiles.com.

https://encoding.spec.whatwg.org

https://rust-lang.org

https://crates.io

https://www.rustacean.net

https://www.w3.org

https://developer.mozilla.org