Si Ranker builds free, fast, privacy-friendly online calculators that help people make better everyday decisions — starting with one of the most underrated ones: when to go to sleep.
Most online tools are cluttered, slow, or hide their logic. We build the opposite: clean, single-purpose calculators that explain how they work and why the result matters, backed by well-established published research and guidelines. No sign-ups, no data collection from the tools themselves — everything runs right in your browser.
Our flagship tool. Enter your wake-up time (or bedtime), your age, and how long you take to fall asleep — it maps out the best times to sleep or wake based on 90-minute sleep cycles, so you wake up between cycles instead of in the middle of deep sleep. Try it here.
More calculators are on the way, covering sleep, health, and daily-life planning. Each new tool follows the same principles: instant results, transparent methodology, and clear supporting information.
Every tool and article on Si Ranker is originally written and built by our team. Health-related content is based on general guidelines published by recognized sleep-research bodies and widely cited scientific literature — and we always remind readers that our tools provide general estimates, not medical advice.
Si Ranker is founded and run by Ishaq Hassan, a digital marketing and SEO professional who has spent years helping businesses build fast, useful, search-friendly websites. Si Ranker is his own project: a home for the kind of clean, transparent, genuinely helpful tools he believes the web needs more of.
Every calculator on this site is planned, researched, and reviewed by him before it goes live — including the methodology notes and supporting content that accompany each tool.
Connect on LinkedIn →Have a suggestion for a new tool, found a bug, or want to report an issue with our content? We'd genuinely like to hear from you.
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