Spíra Fertility — Evidence-Based Fertility Tracker

Spíra is a private, evidence-based fertility tracking and pregnancy planning app for couples. Track ovulation, BBT, and your fertile window on iPhone & iPad.

Plan for pregnancy together — with science, not guesswork

Spíra Fertility is a calm, evidence-based fertility tracking and preconception app built for couples. Track your cycle, identify your fertile window, log ovulation tests and basal body temperature, and prepare for pregnancy with guidance drawn directly from major medical organizations and government health agencies in the US and Europe.

Whether you’re just starting to think about trying, actively planning a pregnancy, or facing challenges along the way, Spíra is designed to support both partners through every stage of the journey.

A fertility app designed for couples, not just individuals

Most cycle trackers treat fertility as a solo project. Spíra is built around shared understanding: both partners can engage with the same data, learn together, and arrive at appointments aligned. Privacy and consent stay at the center — you decide what to track, what to share, and what to delete.

What’s inside the app

Comprehensive cycle and ovulation tracking

• Period tracking — including irregular cycles
• Ovulation tests (LH) — log strips and digital tests
• Basal body temperature (BBT) — chart your shifts over time
• Cervical mucus and key symptoms — the full fertility awareness picture
• Fertile window predictions — presented clearly, with honest transparency about uncertainty

Spíra is upfront about what the data can and can’t tell you. No false confidence, no algorithmic black box.

Evidence-based preconception guidance

Practical, plain-language explanations of:

• Nutrition and supplements before conception (folate, iodine, vitamin D, and more)
• Lifestyle factors that affect fertility for both partners
• Health considerations to address before trying
• When to talk to a healthcare professional — and why it matters

Every recommendation is linked to authoritative sources such as major medical organizations and government health agencies in the US and Europe. The focus is on what to do, why it matters, and when to seek help — not on overwhelming you with articles.

Compassionate support if conception takes longer

For couples experiencing difficulties, Spíra offers clarity without panic:

• Recognize when it may be time to seek medical advice
• Understand what fertility evaluations typically involve for both partners
• Export cycle data in a clinician-friendly format to make appointments more productive

Privacy by design — your fertility data stays yours

This matters more than ever. Spíra collects no data. No servers, no analytics, no profiles, no email list. Everything stays on your device, with strong privacy protections and clear control over what you track, share, or delete.

Who Spíra is for

• Couples trying to conceive (TTC) who want a shared, evidence-based companion
• Anyone tracking ovulation, BBT, or fertile windows — including with irregular cycles
• People in early preconception planning wanting to optimize health before trying
• Couples facing fertility difficulties who want to arrive at clinic appointments prepared
• Privacy-conscious users who refuse to hand cycle data to ad networks

Family Sharing is supported.

Important note

Spíra Fertility does not replace medical care. It helps you arrive informed, prepared, and confident, whether your path to pregnancy is straightforward or takes longer than expected.