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Changelog

What changed and when.

Every calculator launch, methodology revision, and editorial pass. Most recent first.

  1. Feature

    Site redesign: the clinical-minimal system

    A full visual and structural redesign. The site now organises its 24 calculators into three intents (Tonight, Understand yourself, Fix a schedule) with mode tabs linking related tools, a new answer-first homepage with tonight's timeline, a rebuilt Jet Lag planner with a day-by-day light and sleep chart, side-by-side desktop layouts on every calculator, and a new dark-first look in Inter with a paired day mode. Every calculator kept its URL and its methodology; nothing moved, nothing broke.

    Tonight's tools · Jet Lag Calculator

  2. Launch

    Four new lifestyle calculators; catalogue now 22

    The Sleep Hygiene Quiz, Screen Time Cutoff Calculator, Best Temperature for Sleep, and Social Jet Lag Calculator went live, extending the suite into the lifestyle and environment cluster.

    Sleep Hygiene Quiz · Social Jet Lag Calculator

  3. Feature

    Calculator suite UX overhaul

    A full UX audit of all 18 calculators led to five correctness fixes (jet lag timezone math, alcohol finish-by time, nap fitting, sleep debt blank nights), readable night-mode text everywhere, shared time inputs that behave on iOS, larger touch targets, quizzes that survive a refresh, and a faster two-field sleep debt calculator with an optional night-by-night mode.

    Sleep Debt Calculator · Bedtime Calculator

  4. Methodology

    Methodology gets formulas; About rewritten

    Every calculator on the methodology page now shows its formula above Sources, rendered as typeset math via KaTeX, with sources re-audited against the lib/ code. About page rewritten in a shorter first-person voice.

    Methodology · About

  5. Launch

    Two new articles: 90-minute cycles and baby wake windows

    Wake Windows by Age pairs with the Baby Sleep Calculator and covers the AAP and NSF age-based ranges. Why 90-Minute Cycles Matter pairs with the Bedtime Calculator and covers the Kleitman and Dement research plus individual cycle variation.

    Wake Windows by Age · Why 90-Minute Cycles Matter

  6. Editorial

    Methodology page, citation footers, and llms.txt shipped

    Every calculator now carries a Built on attribution block, the methodology page consolidates every formula and its sources at one URL, and /llms.txt is published for AI search engines.

    Methodology · llms.txt

  7. Editorial

    Site-wide editorial review

    All 18 calculators and 11 articles reviewed against the citation roster in lib/content/citations.ts. Disclaimer rolled out to every YMYL page.

  8. Launch

    Catalogue complete: 18 calculators live

    Final stage-5 calculators landed: chronotype, melatonin timing, schedule fixer, alcohol and sleep, teen sleep, and sleep banking. Site now covers all four clusters.

    Circadian tools hub

  9. Feature

    Sitemap and breadcrumbs structured for indexing

    BreadcrumbList JSON-LD on every page; sitemap pulls article modified dates from git, calculator dates from a stage-bucketed map.

  10. Launch

    Beachhead and volume calculators live

    Sleep cycle, bedtime, wake-up time, sleep debt, and caffeine cutoff went live, followed by nap and how much sleep do I need.

  11. Idea

    Idea: a sleep calculator hub with the math shown

    Got serious about health and started focusing on sleep. Looked at the calculators that already existed and felt they could be improved — assumptions hidden, sources missing, math not always holding up. The seed for SleepTools.co: a portfolio site with formulas present, assumptions transparent, and sources cited.

Got a correction or a calculator request? Email hello@sleeptools.co.