Mira
Mira Plus Fertility Hormone Monitor
6.9/10 overallAround £200 for the analyser (wands sold separately)
A connected hormone-monitoring device that measures actual LH and estrogen levels via urine test wands, not just predicting from calendar data.
Mira takes a fundamentally different approach from Flo's app or Natural Cycles' temperature-based method already in this category: it's a small analyser device that reads actual hormone concentration levels (not just positive/negative) from disposable test wands, syncing quantified results to a companion app. This gives genuinely more granular data than a smiley-face or line-based test, useful if you're trying to understand your cycle in more depth, or working with a fertility specialist.
The cost structure is the main consideration against Femometer's simpler basal thermometer also in this category: the analyser device itself is a one-off cost, but the test wands are an ongoing consumable expense, and Mira sits at the premium end of the fertility-apps-tools category overall as a result. It's best suited to those who want lab-style quantified hormone data at home rather than the simplest possible tracking method.
What we liked
- Quantified hormone data, more detailed than positive/negative tests
- Useful for working alongside a fertility specialist
- Companion app tracks trends over multiple cycles
Where it falls short
- High upfront cost for the analyser device
- Ongoing cost of disposable test wands
- More complex than most people trying to conceive actually need
Specs
- Data
- Actual hormone concentration levels, not just positive/negative
- Format
- Analyser device + disposable test wands
- Connectivity
- Bluetooth, companion app
- Ongoing cost
- Test wands sold separately
- Tracking method
- Quantified LH/estrogen hormone analysis
How we scored it
Prediction Accuracy
How reliably the tool identifies or confirms the fertile window.
Quantified hormone readings give more granular accuracy than binary positive/negative tests.
Ease of Daily Use
How simple it is to fit into a daily routine.
More setup and ongoing wand costs than simpler app or strip-based tracking.
Value for Money
Subscription or purchase cost relative to what you get.
Premium pricing for a level of detail most people trying to conceive don't need.
Weighted by importance for this category — see our editorial policy for how we test.
The alternative
Femometer
Vinca Bluetooth Basal Body Thermometer
Measures to 1/100th degree accuracy and syncs to an app to chart temperature-based ovulation confirmation.