Sleep Calculator helps you find the perfect bedtime or wake-up time using the science of 90-minute sleep cycles. Unlike generic sleep apps, it's built for speed and global reach — supporting 9 languages in one lightweight site that loads in milliseconds. No sign-up, no tracking, just results. Whether you speak English, 中文, Español, or العربية, you get the same accurate calculations instantly.
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Maker
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I built Sleep Calculator after struggling to find a simple, fast tool that actually worked. Most sleep apps are bloated, require accounts, or are only in English.
I wanted something that:
Loads instantly (<150ms)
Works in 9 languages for a truly global audience
Respects privacy — no tracking, no data collection
Uses real sleep science (90-minute cycles)
The core idea: align your sleep with natural 90-minute cycles so you wake up at the right moment between stages, feeling refreshed instead of groggy.
This is my first side project. Would love your feedback! 🚀