Murph vs Natural Cycles
Natural Cycles is cleared as birth control. Murph is the assistant around it.
Reviewed · 4 official Natural Cycles sources · No affiliate links · How we research
The short answer
Choose Murph
Choose Murph if you want an educational assistant that reads your wearables, labs, and records together in iMessage or Telegram, answers open-ended questions, runs experiments, and handles errands, and you are not looking for contraception.
Choose Natural Cycles
Choose Natural Cycles if you want FDA cleared, hormone-free birth control or conception planning based on overnight temperature from the NC Band, Apple Watch, Oura, WHOOP, or Garmin, with a daily red or green fertility status.
Murph vs Natural Cycles at a glance
Ten decisions, each traced to the official sources listed below.
- Yes
- No
| Capability |  Murph |  Natural Cycles |
|---|---|---|
| Where Natural Cycles goes further (3 rows) | ||
| FDA cleared birth control | No | Yes |
| Daily fertility status | No | Yes |
| Included temperature band | No | Yes |
| Where they overlap (2 rows) | ||
| Symptom and mood logging | Yes | Yes |
| Oura WHOOP and Garmin data | Yes | Yes |
| Where Murph goes further (5 rows) | ||
| Free start without a card | Yes | No |
| Works in iMessage or Telegram | Yes | No |
| Handles health errands | Yes | No |
| Tests what works for you | Yes | No |
| Open source option | Yes | No |
Read the full evidence9 dimensions, in each product's own words
| Dimension | Murph | Natural Cycles |
|---|---|---|
| Primary job | MurphTurn scattered health context into an ongoing private relationship, clearer decisions, and practical follow-through.Source 1 | Natural CyclesPrevent or plan pregnancy without hormones by turning overnight temperature and cycle data into a daily fertility status you can act on.Source 3Source 4 |
| Product format | MurphA private ongoing conversation in familiar messaging, with a web account for deeper review and control.Source 1 | Natural CyclesAn iPhone, iPad, Apple Watch, and Mac app built around a daily red or green fertility status, a temperature graph, cycle history, and five modes: NC Birth Control, Plan Pregnancy, Follow Pregnancy, Postpartum, and Perimenopause.Source 3Source 4Source 6 |
| Data and inputs | MurphConversation, authorized wearable and lab connections, records, notes, meals, symptoms, workouts, and manual measurements.Source 1 | Natural CyclesOvernight temperature from the NC Band or a compatible wearable, period dates, optional LH test results, mood, and symptoms. The algorithm uses temperature and cycle data to calculate fertility status. Labs and medical records are not part of the product.Source 3Source 6 |
| How it interprets | MurphConnects context across domains, explains relevant patterns, and helps test what works for one person over time.Source 1 | Natural CyclesA regulated algorithm turns temperature and period data into a daily fertility status and personal ovulation patterns, with extra red days as a safety buffer. Insights explain cycle trends over time and, in pregnancy and perimenopause modes, what to expect.Source 3Source 4 |
| Follow-through | MurphPlans, reminders, check-ins, practical health errands, personal experiments, and optional group support.Source 1 | Natural CyclesA daily fertility status each morning, more red days early on while the algorithm learns a cycle, educational messages, mood trackers, LH test timing, and modes that carry a member from birth control through pregnancy, postpartum, and perimenopause. No human coaching is documented.Source 3Source 4 |
| Required hardware | MurphNo proprietary device is required. Connected wearables can add useful signals.Source 1 | Natural CyclesTemperature is required. The NC Band wrist wearable is included with an annual subscription and syncs directly. Alternatively an Oura Ring with membership, an Apple Watch Series 8 or later, Ultra, or SE3, a WHOOP, or a compatible Garmin can supply overnight temperature.Source 3Source 4Source 6 |
| Platforms | MurphHosted messaging and web experiences, plus an open-source option that can be inspected and run locally.Source 1 | Natural CyclesiPhone on iOS 16.7 or later, iPad, Apple Watch on watchOS 9 or later, and Apple silicon Macs on the App Store. The pages reviewed did not cover an Android build. Wearable data syncs from the Oura app, Apple Health, WHOOP, or Garmin depending on the device.Source 4Source 6 |
| Cost model | MurphFree starter usage is available without a card. Paid plans add more usage when needed.Source 1 | Natural CyclesA subscription is required for the core features. The App Store listed Monthly at $21.99 and Annual at $149.99 when reviewed, with the NC Band included on the annual plan. US subscriptions are FSA and HSA eligible.Source 3Source 6 |
| Clinical role | MurphEducational health support. Murph is not emergency care and does not diagnose or treat disease.Source 2 | Natural CyclesNatural Cycles is a regulated medical device. It was FDA cleared as a contraceptive app in 2018 and is certified as a class II device in the EU, UK, Canada, Australia, Singapore, Brazil, and South Korea. It is intended for women 18 and older and reports 93 percent effectiveness with typical use and 98 percent with perfect use.Source 3Source 6 |
Material tradeoffs
- Natural Cycles is a regulated contraceptive with published effectiveness numbers. Murph is not a medical device and cannot tell you whether today is a fertile day.
- It needs a temperature source and a paid subscription, and irregular cycles or missed measurements mean more red days. Hormonal birth control must be stopped before starting.
- Natural Cycles stays inside cycle and fertility. Murph reads the same wearables for sleep, recovery, and training, adds labs, records, and meals, and takes on errands and experiments, but it has no fertility algorithm.
Common questions about Murph and Natural Cycles
Which wearables work with Natural Cycles?
The NC Band syncs directly and comes with the annual plan. Otherwise you can wear an Oura Ring with an active membership, an Apple Watch Series 8 or later, Ultra, or SE3, a WHOOP, or a compatible Garmin overnight. Older Apple Watch SE models lack a temperature sensor and do not work.
How much does Natural Cycles cost?
The App Store listed $21.99 a month or $149.99 a year when reviewed, and the annual plan includes an NC Band. There is no free tier. The company says the subscription funds a regulated device and means it does not sell user data. US subscriptions are FSA and HSA eligible.
Can Murph be used for birth control?
No. Murph is educational, is not a medical device, and does not compute fertility status. It can read temperature and cycle data from connected wearables and talk through patterns, but contraception decisions belong with Natural Cycles or a clinician.
Official sources
Reviewed . This is official-source desk research, not hands-on product testing. Pricing and availability can change.
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