Whoop 4.0
Screen-free recovery and strain coaching — the choice of pro athletes (subscription required).
The Whoop 4.0 (2023) is a fitness band with a list price of $239 in our database. It is rated for about 5 days per charge, weighs 27 g with a 32 mm case and an E-ink display, and includes blood-oxygen (SpO₂). It works with both iPhone and Android.
Specs last updated
Specifications
What it is good at
- Water-ready: rated 10ATM, suitable for swimming and surface water sports.
Best for
Features
Who should skip it
- You want to run or ride without your phone — it has no built-in GPS.
- You want a big, easy-to-read screen — the case we list is only 32 mm.
Frequently asked questions
How long does the Whoop 4.0 battery last?
The manufacturer rates it at about 5 days per charge. Always-on display, constant GPS and cellular use shorten that. Among the 6 fitness bands in our database it beats about 0% on rated battery life.
Does the Whoop 4.0 work with iPhone and Android?
It works with both iPhone and Android.
Can I swim with the Whoop 4.0?
10ATM is suitable for swimming and surface water sports. It is not a dive rating unless the maker says so. It has no dedicated swim-tracking mode in our data.
How much does the Whoop 4.0 cost?
Our database lists $239 (May 2026). That is a list price, not today's price, so check the Amazon listing before you buy.
Who should not buy the Whoop 4.0?
It is a poor fit if any of these apply. You want to run or ride without your phone — it has no built-in GPS. You want a big, easy-to-read screen — the case we list is only 32 mm.