Sleep cycle calculator — free for any website

Bedtimes for full 90-minute sleep cycles..

Utility & badges

Use it now — freeWhy free? See how this compares to Elfsight →
your-site.com — live preview

What is Sleep cycle calculator?

Sleep cycle calculator is one of 590+ free widgets on PlanckUi. Bedtimes for full 90-minute sleep cycles.. Badges, notices and small utilities quietly answer questions so visitors don't have to ask.

Use anywhere a small element can remove a doubt or add credibility.

Everything is rendered in an isolated shadow DOM, so it can never conflict with your site's own styles — and at a few kilobytes, it won't move your page speed.

Everything included

  • Bedtimes for full 90-minute sleep cycles..
  • Free forever — no watermark, no usage limits, no "upgrade to remove"
  • Customize everything: colors, fonts, corner radius, shadows, dark mode
  • Copy-paste install: one snippet of HTML works on any website builder

Add Sleep cycle calculator to your website in 3 steps

  1. Customize it. Use the Paint editor right on this page — set your colors, fonts, radius and content. Sleep cycle calculator updates live as you change things.
  2. Copy the HTML. One click gives you a self-contained snippet. No account needed, nothing to install, no script from our servers.
  3. Paste it on your site. Paste it anywhere HTML goes: your site, a landing page, WordPress, Webflow, Wix, Squarespace, Shopify, Ghost — if it renders HTML, it works.

Sleep cycle calculator is free on PlanckUi — the same embed runs $15–40/month on Elfsight or Common Ninja. No watermark, no usage limits, no credit card.

Frequently asked questions

Is Sleep cycle calculator really free?
Yes — completely. PlanckUi widgets are free forever, with no watermark, no usage limits and no credit card. Paid widget platforms charge $15–40 per month for the same embeds.
Do I need an account to use Sleep cycle calculator?
No. Click "Copy HTML" and paste it on your site — that's the whole flow. An account is only needed if you want to collect live data (like customer testimonials) and manage it from a workspace.
Does it work on Wix, Squarespace, Webflow, WordPress or Shopify?
Yes. If a platform lets you paste an HTML embed block — and all of them do — Sleep cycle calculator works there. The snippet is plain HTML and CSS in an isolated shadow root, so it can't fight with your theme.
Will Sleep cycle calculator slow down my website?
No. The widget is a few kilobytes of HTML and CSS rendered locally in your browser — no external requests, no tracking scripts, no layout shift.

More free widgets like this

Browse the full catalog of 590+ free widgets.