Mira, reviewed.

What we tested.

We ran Mira's Max device with a Plus tier subscription across two full cycles in February and March 2026. The setup is straightforward: unbox the device, pair to the iOS or Android app, scan the included wand pack. The morning routine: first-morning urine, dip the wand for 15 seconds, slot it into the device, wait three to five minutes for the reading. The app logs the value and overlays it on a multi-cycle chart.

By day five of the first cycle, the app had a working LH baseline. By day eleven, estrogen was beginning its pre-ovulation climb. The LH surge landed on day fourteen — predicted by the app forty-eight hours in advance based on the estrogen trajectory. Progesterone rose three days after the surge, confirming ovulation. The whole picture rendered as a single curve.

For a woman tracking fertility, this is information that a one-off day-3 hormone panel cannot give you. A day-3 panel is one frame of one episode. Mira shows you the whole season.

"A day-3 panel is one frame of one episode. Mira shows you the whole season."

Where Mira genuinely shines.

• Daily resolution across the cycle — no other consumer tool gives you a continuous picture of LH, estrogen and progesterone movement across an entire menstrual cycle.
• Quantitative readings, not just high/low — Mira reports actual hormone concentrations. This is the meaningful step up from ovulation predictor strips (which give you a binary signal only).
• AI cycle predictions improve over time — the app learns your specific patterns. By cycle two or three, predictions for fertile window and ovulation date are personalised to your hormones, not a population average.
• Ovulation confirmation — progesterone tracking confirms ovulation actually happened, which an LH surge alone cannot. For women with irregular cycles or unexplained fertility struggles, this is real diagnostic-adjacent value.
• Privacy-respecting device design — the Bluetooth pairing and app architecture keep readings local-first. Hormone tracking is sensitive data; Mira's privacy posture is the strongest in the category.

Where it loses points.

• Ongoing wand cost — the device is $199 once. The wands are $30–$50 a month, depending on how aggressively you test. Over a year, you may spend $500+ on the wand subscription on top of the device cost.
• Urine-based, not blood-based — urine hormones are real and useful. They are not the same as serum levels and shouldn't be treated as a clinical equivalent. A clinician evaluating a fertility workup will still want a blood draw.
• Learning curve — first-cycle data is noisier than later-cycle data because the algorithm is still learning. Plan to commit at least two full cycles before evaluating the tool.
• Doesn't measure thyroid, prolactin or AMH — Mira is specifically a reproductive-cycle hormone tracker. For the broader fertility picture, you'd pair it with a Modern Fertility panel or a clinic draw.
• Daily testing discipline required — missed days break the curve. Mira asks for habit consistency that real life doesn't always allow.

Who it's best for.

• The woman trying to conceive (TTC) and wanting maximum cycle clarity — fertile window, ovulation confirmation, progesterone trajectory. Mira's data is the highest-resolution at-home picture in the category.
• The woman with irregular cycles — wants to see what her hormones are actually doing across two or three cycles before pursuing a clinic workup.
• The woman with suspected anovulation — period-like bleeding without confirmation that ovulation actually occurred. Mira's progesterone reading is the clearest "yes or no" signal at home.
• The perimenopause-curious woman in her 40s — wants to watch what's happening to her cycle in real time as it starts shifting. Mira's longitudinal view is the most legible tool for early perimenopause patterns.

Who it's not for.

• Women wanting a one-off snapshot — Modern Fertility's day-3 panel is the right tool for "where am I right now," not Mira.
• Women not actively cycling — postmenopausal women, women on hormonal contraception that suppresses the cycle, women without regular cycles for other reasons. The signal Mira is reading isn't there to read.
• Women on a tight monthly budget — the ongoing wand subscription adds up. Cheaper alternatives exist if cost is the binding constraint.

Price and what's included.

Mira's commercial model is device + consumables. The device is a one-time purchase; wands and app subscription are ongoing. Pricing varies by tier — what we'd flag as the consumer-relevant detail:

The Plus tier is the right starting point for most women — typical usage of 15 wands a month gives you full follicular-and-luteal coverage. Pro tier is for women who want denser sampling around ovulation (twice-daily readings during the LH surge window).

How it compares to Modern Fertility.

The natural comparison for Mira is Modern Fertility's at-home hormone panel. Different tools, different questions, both fertility-focused. Here's how they relate:

The honest read: Modern Fertility is cheaper and gives you a clinical-grade hormone snapshot on day 3. Mira gives you the entire cycle in daily resolution but costs more. They answer different questions. The strongest fertility approach is often both — Modern Fertility for the baseline blood panel, Mira for the ongoing cycle tracking. See best hormone tests for women and the broader at-home tests comparison for the wider picture.

The case against.

Three honest critiques.

Urine hormone tracking is not a clinical equivalent to blood. Mira reports concentrations in micrograms per litre of urine — real numbers, real signal, but downstream of the kidney-filtration process and not directly comparable to serum levels. For most users this is a feature, not a bug — the trends are what matter. For a clinician evaluating fertility, blood is still the gold standard.

The ongoing cost compounds. A first-year Mira commitment is $560–$800. Over three years of active fertility tracking, you're at $1,500–$2,000. That's worth it for some women and overshoot for others. Run the math before committing.

The AI predictions are useful, not magical. Mira's app gets meaningfully better at predicting your fertile window after two or three cycles of data. It's still working with three hormones. For women with PCOS, perimenopause-pattern irregularity, or anovulatory cycles, the predictions may stay noisier than the marketing implies.

Should you actually buy it?

For women whose central question is fertility, who want to actually see their cycle as a continuous curve rather than a one-off snapshot, who can absorb the $200 device cost and ~$40/month wand subscription — yes, Mira is the best dedicated tool in the U.S. category. The 7.9 reflects strong execution on the hormone-monitoring promise, deductions for ongoing cost and the urine-vs-blood gap.

For women whose question is broader, or whose primary alternative is a one-off Modern Fertility panel for $159 — start with the panel, decide based on what it surfaces whether the ongoing tracking is worth it.