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Best for

Best sleep tracker without a subscription

Rings and straps that track sleep without a mandatory monthly fee, compared with Oura ($349 + membership) and WHOOP (membership).

Last updated 18 Oct 2026 · ranked by Renvo Score, then price

Illustration (generic drawing, not the actual product)
Illustration, not a product photo

The honest answer

All four pass our safety and company checks and score 62–69 ("Good swap") on our scale revised 18 Oct 2026. None has a fully independent accuracy study we could find (RingConn's study was run with RingConn; Ultrahuman's are brand-run), so none reaches 80 ("Great swap"). Scores show which has the most evidence behind it.

  1. 1

    Amazfit Helio Strap

    $99.99 vs. WHOOP membership $239

    Highest score in this group and the lowest price; screenless strap with no required subscription.

    Screenless strap, no required subscription

    Full comparison with sources →

    69Good swapCheck current price at Amazfit Official product page · no commission
  2. 2

    RingConn Gen 2

    $299 vs. Oura Ring 4 $349

    Smart ring, no subscription, $50 less than Oura Ring 4.

    No subscription

    Full comparison with sources →

    68Good swapCheck current price at RingConn Official product page · no commission
  3. 3

    Ultrahuman Ring Air

    $349 vs. Oura Ring 4 $349

    Smart ring with no mandatory subscription; same price as Oura Ring 4 before Oura's membership.

    No mandatory subscription

    Full comparison with sources →

    64Good swapCheck current price at Ultrahuman Official product page · no commission
  4. 4

    Polar Loop

    $199.99 vs. WHOOP membership $239

    Screenless band, one-time purchase.

    Screenless band, one-time purchase

    Full comparison with sources →

    62Good swapCheck current price at Polar Official product page · no commission

How this list works: products come from our comparison pages; order is Renvo Score first (where one exists), then price. We don't test products hands-on. "Best for" here means the strongest published evidence and price within the stated budget, not a test result. Commission never affects order. Method

Last updated 18 Oct 2026