What hako.to is
hako.to is a small box of single-purpose web tools — a hiragana typing game, a week-number calculator, a box-breathing timer, a ukulele practice app, a word counter, a password generator, a colour picker, a unit converter. Each tool does exactly one thing, runs entirely in your browser, and needs no account, install or download. Everything here is free and ad-supported.
How content is produced
The interactive tools are written by a human developer in plain JavaScript and run deterministically in your browser. The calculations, conversions, game logic and timing are exact — they do the same thing every time, with no language model involved.
The supporting written content — the explanatory guides, references and FAQs that sit alongside each tool — is produced by an AI-assisted workflow under human editorial direction. The site's owner sets the topics, reviews builds, retires anything that doesn't meet the bar, and steers the editorial direction of the property. Topics are chosen for their evergreen value (counting in Japanese, ISO week numbers, how to tune a ukulele) rather than to chase trending search terms.
The combination — exact deterministic tools wrapped in editorially-curated reference content — is intentional. Each guide is meant to actually help: a learner finding the time-telling page on kana, a payroll admin checking what counts as a business day, a beginner ukulele player looking up their first chord shape.
Quality and editorial standards
- Factual care. Guides cover topics where there is a clear, primary-source answer (the ISO 8601 calendar, the gojūon chart, the standard ukulele tuning). We aim to be accurate and clear; corrections are welcome and acted on quickly.
- Original work. Pages are written for hako.to, not aggregated or copied from other sites. Each one is meant to add value as a focused, single-topic explanation.
- Reviewed publication. Every page is built through a published, auditable process and reviewed before going live. The site's changelog records every change with a date.
- For important decisions. Like any web resource, please verify anything critical (medical, legal, financial, exam-related) against a primary source. We're a useful starting point, not a substitute for professional advice.
Your privacy
The tools store your scores, settings and progress only in your own browser's local storage. Nothing is uploaded to a server-side profile. There is no account system, no sign-up, and no tracking pixels beyond the standard analytics any ad-supported site needs to run. The changelog page documents exactly what changes when.
Found something wrong?
Please flag it through the Ko-fi support link in the footer of any page, or note it on the changelog. Corrections are usually applied within a day or two.
Last reviewed 2026-06-11. This page describes the editorial process behind hako.to and is published in line with EU AI Act Article 50 transparency expectations.