WHOOP 4.0 vs 5.0: What Changes for PPG and Recovery Tracking?
WHOOP 5.0 builds on the 4.0's foundation with an upgraded PPG sensor array, improved algorithms, and new biometric capabilities. For current WHOOP members considering the upgrade, understanding the specific sensor improvements helps evaluate whether the new hardware delivers meaningfully better recovery and strain data compared to the already-capable 4.0 platform.
Specifications Comparison
| Specification | WHOOP 4.0 | WHOOP 5.0 |
|---|---|---|
| PPG Sensor | 5-LED (3 green, 1 red, 1 IR), 4 photodiodes | 7-LED (4 green, 1 yellow, 1 red, 1 IR), 5 photodiodes |
| Sampling Rate | 100 Hz | 128 Hz |
| LED Wavelengths | Green 530 nm, Red 660 nm, IR 940 nm | Green 530 nm, Yellow 590 nm, Red 660 nm, IR 940 nm |
| Battery Life | 4–5 days | 5–6 days |
| Price | $30/month subscription (hardware included) | $33/month subscription (hardware included) |
| Weight | 27 g | 22 g |
| Water Resistance | IP68, 10 m | IP68, 10 m |
| Skin Temperature | Not available | Yes, continuous monitoring |
| HRV Accuracy (ICC vs ECG) | 0.88–0.91 | 0.92–0.95 (estimated) |
Pros & Cons
WHOOP 4.0
Pros
- + Proven 5-LED PPG sensor with extensive validation data
- + Mature recovery algorithm refined over multiple software updates
- + Wide accessory ecosystem with body-wear options for bicep and clothing
- + Established community features with team and group comparisons
Cons
- - 100 Hz sampling rate is lower than newer competitors
- - No skin temperature sensor for illness detection
- - SpO2 hardware exists but is not user-accessible
WHOOP 5.0
Pros
- + Upgraded 7-LED PPG sensor array with enhanced signal-to-noise ratio
- + Skin temperature monitoring for illness and cycle tracking
- + Improved SpO2 with user-facing blood oxygen data
- + Smaller form factor with thinner profile and lighter weight
Cons
- - Higher subscription cost at $33/month for new members
- - Still no display for real-time data viewing
- - New algorithms may show different Recovery scores than 4.0 during transition
Verdict
WHOOP 5.0 delivers a meaningful PPG sensor upgrade with its 7-LED array and 128 Hz sampling, adding a yellow LED wavelength that improves signal quality across more skin tones. The addition of skin temperature monitoring and user-facing SpO2 addresses two significant 4.0 limitations. For current WHOOP members, the upgrade provides genuinely better data quality, though the core Recovery Score methodology remains similar. New users should start with 5.0; existing 4.0 users in mid-subscription may find the improvement incremental for day-to-day recovery guidance.
Frequently Asked Questions
Is WHOOP 5.0 PPG significantly more accurate than 4.0?
WHOOP 5.0's 7-LED array with 128 Hz sampling provides improved signal-to-noise ratio compared to 4.0's 5-LED, 100 Hz configuration. The addition of a yellow (590 nm) LED improves accuracy across diverse skin tones by providing better hemoglobin absorption contrast at an intermediate wavelength.
Do WHOOP 4.0 members get a free upgrade to 5.0?
WHOOP has historically offered hardware upgrades to existing members, though terms vary. Check your membership agreement for upgrade eligibility. The subscription model means hardware costs are distributed over time rather than requiring a large upfront payment.
Does WHOOP 5.0 change how Recovery Score is calculated?
WHOOP 5.0 uses the same core Recovery Score methodology (HRV, resting HR, sleep performance) but benefits from higher-quality input data. The addition of skin temperature as a Recovery input is the main algorithmic change, enabling earlier illness detection that may lower Recovery scores before symptoms appear.