"No deposit" gets advertised loosely across comparison sites, so this page only lists offers where the supplier confirms no hold on your card at pick-up — not a reduced deposit, not a deposit refunded later, an actual zero hold.
No-deposit offers typically come with full insurance bundled into the price rather than added separately, which is why the per-day rate can look higher than a standard offer — the comparison is fairer once you add back the deposit-holding alternative's insurance cost.