Night temperature band for couples trying to conceive, linked to their clinic
TL;DR Basalwise is a band worn at night that tracks skin temperature to show a woman's likely fertile window, with cycle charts her gynaecologist can see. Fertility clinics offer it to couples in the months before costly treatment. Couples get better timing, and doctors get real cycle data instead of guesses.
WHO estimates that about one adult in six faces infertility at some point[1]. In India, an analysis of NFHS-5 found 3.28% of married women with primary infertility and 13.9% with secondary infertility[2]. Other Indian reviews give lower overall figures, so check the definitions before you quote any one number.
The money at stake is big. A 2026 study found couples spent ₹1,10,104 per IVF cycle out of pocket in public hospitals and ₹2,30,668 in private ones[3]. Before they get there, many couples try for months with poor timing, and at the first visit the doctor has little to go on beyond what the woman remembers about her cycle.
What it does, in regulatory terms - fertility-awareness and cycle tracking that supports, but does not replace, a doctor's assessment. Basalwise does not diagnose infertility or treat it, it doesn't work as contraception and the app says so. Software that predicts ovulation may count as medical device software in India, so check the classification before launch.
The woman wears a soft band on her upper arm or wrist while she sleeps. It records skin temperature through the night and uploads in the morning. After one or two cycles, the app shows the probable fertile window and confirms whether a temperature shift happened, which suggests ovulation occurred. Odd patterns, such as no shift for several cycles, prompt a gentle nudge to see her doctor. With her consent, her clinic sees the same charts.
I reframed the seed, which pitched continuous monitoring for women's health in general. That's too broad to sell, and the directory already covers perimenopause. Trying to conceive is a narrow, urgent need with a clear payer.
The couple pays, usually through a monthly plan with a band deposit. Fertility clinics and gynaecologists recommend it and may bundle it into a pre-treatment package. For comparison, one home fertility-test brand sells a hormone monitor at US$119 (about ₹11,500)[4]. Clinics win too, because better data shortens the first workup and helps them decide sooner which couples need tests or treatment.
The evidence on wearables has improved. A 2026 meta-analysis of 27 studies found pooled accuracy of 0.88 for detecting the fertile window, with ring-type devices doing best[5]. CDSCO issued guidance on medical device software in 2026, which helps founders plan classification[6]. The ART Act 2021 requires fertility clinics to register, which makes them easier to find and approach[7].
There's no public figure for India's fertility-tracking wearable market. The narrowest signal is spending - couples who reach IVF pay ₹1.1–2.3 lakh per cycle[3], so a few thousand rupees on better timing first is a small ask.
One fertility app, which pairs with temperature from several wearables, says it is FDA-cleared as birth control[8]. So temperature-based tracking can clear a regulator.
Fertility apps abroad read temperature from smart rings, smartwatches and their own bands[8]. Home fertility-test brands sell hormone test readers[4]. Both are aimed at consumers who buy on their own, not at Indian clinics. The gap is a lower-cost tracker sold through Indian gynaecologists, with charts built for a doctor's first consultation.
| Difficulty | Moderate (46/100) |
| Starting capital | ₹80 L–1.6 Cr |
| Time to launch | 9–12 months |
The hard parts are accuracy and trust. Skin temperature shifts with fever, alcohol, heat and late nights, and an Indian summer doesn't help one bit. You need a validation study against urine LH tests in Indian women, and clinics need months of pilot results before they believe the data.
Yes. Ovulation prediction may make the app medical-device software, and you'll work with regulated clinics.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust AI to diagnose infertility or to act as contraception. The app supports a doctor's assessment and should say so on every screen.
Want to work out the AI layer for Basalwise? Talk to Yash →
Here's what can go south -
I'd back this for a founder with a gynaecologist co-founder and a background in consumer health products. If you plan to promise pregnancy outcomes then stay away.
First prove one thing - in 50 women over two cycles, the band's ovulation calls match urine LH tests well enough that a clinic will recommend it.
Plan for roughly ₹80 L–1.6 Cr, covering the band, the app, a validation study and clinic pilots.
Ovulation prediction may count as medical-device software, so get a written classification view from CDSCO first. You also need DPDP consent and careful advertising.
Yes, and the category already exists abroad. Check how your regulator treats ovulation software and whether it can be marketed for contraception.
The free Basalwise validation kit has the line-by-line capital breakdown, the effort scoring, the device-software and consent checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for couples and clinics, and 5 assumptions to test. Download the kit →
Thinking about building Basalwise or something close to it? The make-or-break work is proving accuracy in Indian conditions and getting gynaecologists to trust the charts, and I can help you plan the study and the raise around it. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.