Ava
Ava Fertility Tracking Bracelet
7.7/10 overallAround £249 one-off for the bracelet
A wearable worn overnight that tracks multiple physiological signals to predict the fertile window, without needing daily test strips or wands.
The verdict
The Ava bracelet is worn overnight and passively tracks skin temperature, pulse and breathing to predict your fertile window around 5 days in advance, no test strips needed, for a one-off £249. It suits people who want advance notice rather than after-the-fact confirmation and don't mind the high upfront cost — those wanting direct hormone data should look elsewhere.
Ava is a wrist-worn sensor rather than a urine-based test or manual temperature reading — it tracks skin temperature, resting pulse, breathing rate and other signals overnight and uses the pattern to predict your fertile window a few days in advance, differing meaningfully from Femometer's single-metric basal thermometer already in this category. The advantage is passive data collection: no test strips, no daily readings to remember, just wearing the bracelet to sleep.
Against Natural Cycles' clinically-validated temperature approach also in this category, Ava predicts forward (giving advance notice of the fertile window) rather than confirming after the fact, which some find more useful for planning. The trade-off is a higher upfront cost for the wearable itself, and reliance on consistent overnight wear for the algorithm to build an accurate picture.
Is the Ava Fertility Tracking Bracelet worth it?
- Fully passive tracking, no daily test strips or wands needed
- Predicts the fertile window in advance rather than after ovulation
- Tracks multiple physiological signals for a fuller picture
What are the downsides of the Ava Fertility Tracking Bracelet?
- High one-off cost for the wearable
- Needs consistent overnight wear to build an accurate profile
- Prediction-based rather than a direct hormone confirmation
Specs
- Format
- Wrist-worn bracelet + companion app
- Charging
- Rechargeable, worn overnight
- Data collection
- Passive, no daily test strips
- Tracking method
- Multi-signal overnight wearable (temperature, pulse, breathing)
- Prediction window
- Advance fertile window prediction, typically 5 days
How we scored it
Prediction Accuracy
How reliably the tool identifies or confirms the fertile window.
Multi-signal overnight tracking gives good advance prediction, though not a direct hormone confirmation.
Ease of Daily Use
How simple it is to fit into a daily routine.
Fully passive — no daily test strips or manual readings needed.
Value for Money
Subscription or purchase cost relative to what you get.
High one-off cost, though no ongoing consumable expense unlike wand-based monitors.
Weighted by importance for this category — see our editorial policy for how we test.
How this review was done
We haven't used the Ava Fertility Tracking Bracelet ourselves yet. This review is built from Ava's published specifications and product information, and scored the same way as everything else on the site. We'll update it, and the badge above, once we've tested it hands-on.
How it compares
|  |  |  | |
|---|---|---|---|---|
| Price | Around £249 one-off for the bracelet | Around £200 for the analyser (wands sold separately) | £64.99 (monitor + 10 test sticks), refills from £29.99 | £25.99 |
| Overall score | 7.7/10 | 6.9/10 | 7.1/10 | 7.8/10 |
| Format | Wrist-worn bracelet + companion app | Analyser device + disposable test wands | — | — |
| Tracking method | Multi-signal overnight wearable (temperature, pulse, breathing) | Quantified LH/estrogen hormone analysis | — | — |
| Connectivity | — | Bluetooth, companion app | — | Bluetooth, syncs to Femometer app |
Frequently asked questions
How does the Ava fertility bracelet work?+
It's a wrist-worn sensor that tracks skin temperature, resting pulse, breathing rate and other signals overnight while you sleep, then uses the pattern to predict your fertile window typically around 5 days in advance.
Do I need to do anything daily with the Ava bracelet?+
No — data collection is fully passive. You just wear the bracelet to sleep; there are no test strips, wands or manual readings to remember.
Is the Ava bracelet a one-off cost or a subscription?+
It's a one-off purchase, around £249 for the bracelet, rather than an ongoing subscription or consumable cost — though that upfront price is high compared with app or strip-based options.
Does the Ava bracelet confirm ovulation has happened?+
No — it's prediction-based rather than a direct hormone confirmation, giving advance notice of your fertile window rather than confirming after the fact that ovulation has occurred.
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Reviewed by
Sepehr
Software engineer, soon-to-be dad, uncle to four — the tech-obsessed half of the two of us testing this stuff. Currently building this site with my wife, ahead of our own baby arriving.