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Basal body temperature (BBT) · Band / strap · by Tempdrop
Tempdrop
An armband BBT thermometer that targets the axillary artery to filter out sleep noise — built for shift workers and postpartum charting.
2018Tempdrop
Late in cycle8 yr 5 mo old
API access: No Raw data access: Yes — restricted Open source: No public repo
Clinical value
45/100
Validated BBT charting
Empowerment
45/100
Charts export to FAM apps
Everyday value
55/100
Comfortable overnight band
An upper-arm thermometer that measures basal body temperature near the axillary artery, where skin temperature closely mirrors core, filtering out sleep disturbances, mouth breathing and irregular schedules that defeat oral BBT.
What it measures
Continuous overnight basal body temperature from the axillary site, producing a filtered BBT value and chart for fertility-awareness methods.
Regulatory status
Consumer fertility-awareness device.
Validation & accuracy
Validated in 2025 against urine ovulation kits; highly rated for shift workers, postpartum and irregular-schedule users thanks to its noise resilience.
Data control & export
Raw data: restricted — charts can sync/export to popular fertility-awareness apps, giving decent portability.
Wearability & battery
A soft armband worn overnight; comfortable and resilient to interrupted sleep, but a nighttime single-purpose device.
Cost & access
Consumer hardware, optionally with an app subscription tier.
Who it serves
People charting fertility who need reliable BBT despite irregular sleep or shift work.
Who is left out or burdened
Single-purpose; nighttime only; some features behind a subscription.
✓ Strengths
- Axillary site resists sleep noise
- Great for shift workers and postpartum
- Validated vs ovulation kits (2025)
- Charts export to FAM apps
✕ Weaknesses
- Single-purpose, nighttime only
- Some features need subscription
- No live daytime data
- Armband fit preference
45
Why this clinical score. Validated BBT with strong noise resilience makes it clinically useful for fertility-awareness, though it is single-purpose and not a diagnostic.
45
Why this empowerment score. Charts export to fertility-awareness apps, a real portability plus, holding empowerment at mid.
55
Why this everyday score. Comfortable, set-and-forget overnight wear gives good everyday value for charting users.
Latest news
Reviews & coverage
Reviewers and the fertility-awareness community praise Tempdrop for delivering reliable basal body temperature despite interrupted sleep, shift work or postpartum nights, validated against ovulation kits. The caveats are its single nighttime purpose and partial subscription gating.
Summary is a draft synthesis of public coverage, not an endorsement. Links open a search of each outlet.
Reddit communities
Independent user communities where this device (or its category) is discussed.
Get it · manuals & support
Draft profile · public-source review, June 2026 · scores describe direction and degree, not buying advice. News, links, and prices change — verify with the manufacturer. Image is representative.