TwoLines is a fertility companion built for couples, not individuals. Cycle phases, daily logs, and guidance flow through two lanes — one for each partner — so trying to conceive becomes something you do together, not something one person tracks alone.
You're in the window. Keep it light — no pressure, no charts at the dinner table. Just be together.
Why couple-first
Every fertility app tracks one body and leaves the other partner guessing from the doorway. TwoLines gives both partners a lane — a shared cycle view, and guidance written for each of you, in each phase.
Not a read-only guest. His lane has its own logs, guidance, and role in the journey.
Link two phones with a private invite code. Each partner controls their own account.
Warm, plain language. No lab-coat jargon, no anxiety-inducing scores — a companion, not a chart.
"Trying to conceive is a shared journey that most apps hand to one person. TwoLines was built so that neither of you walks it alone."
What's inside
Everything a couple needs to understand the cycle, stay in sync, and make sense of the medical side — without surrendering their privacy.
One shared journey, two personal lanes — daily logs, moods, and habits for each partner, side by side.
Phase detection, fertile-window prediction, and ovulation estimates that refine themselves as you log.
Your phone is the source of truth. Everything works without a connection and syncs when you're back online.
A space for what this journey actually feels like — yours alone unless you choose to share an entry.
Photograph a lab report and get it explained in plain, calm language — what it says and what to ask your doctor.
Daily guidance tuned to the cycle phase — written separately for each partner, so both of you know what today means.
Privacy
Fertility data is among the most intimate data there is. TwoLines is designed around that fact, not in spite of it.
Your phone holds your data first. TwoLines is offline-first: your logs live on your device, and sync exists to back you up and keep two partners in step — not to harvest your life. Sign-in is a phone number and a one-time code; no social logins, no advertising identity.
TwoLines is a wellness companion, not a medical device — it supports your journey and your conversations with your doctor, and never replaces them. Read our Privacy Policy →
TwoLines is opening its first beta for Indian couples. Be among the first two lanes in.