Wibou

Wibou tells parents what's normal, what's coming next, and keeps the days they'll forget: feeds, naps, first smiles, logged in three seconds, one hand, at 3am. Guidance, not charts.

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3:14am

Our first child arrived, and we were asked to write everything down.

Every feed, every nap, every detail, for medical follow-up. First-time parents, we did it the obvious way: a shared note in Apple Notes. It crashed constantly, and once the list grew past a few hundred lines it jumped around and lost our place, usually at 3am with a baby in one arm. So I did what iOS developers do: I went looking for an app.

The apps I found did the job, but their design never clicked for me: busy screens, a lot of numbers, not much warmth. I wanted something reassuring and complete but never excessive, playful where it can be, and centered on the memories you make with your baby, not only on what you measure.

So I built the one I wanted at 3:14am.

What the night looks like with Wibou

It reassures. Wibou doesn't just record the day, it tells you what's normal at your baby's age.

It guides. Parents don't need more numbers. They need to know what's ahead and whether to do anything about it. First tooth, first steps, the things nobody warns you about until they happen.

It remembers. Before phones held infinite photos, families kept albums. Somebody chose what went in, wrote a date under it, and closed the book. Nothing was automatic, so everything in there was there on purpose. We have twelve thousand pictures now and no album. Wibou is built the old way: the moments you actually want back, kept because you decided they mattered, not because a camera roll swept them up.

It comes with you to the doctor. Wibou keeps a real health record: blood group, allergies and their severity, vaccines, medications, temperatures, growth and every tooth as it comes in. Two taps turn it, together with a tracking report for any period you choose, into a clean PDF for the pediatrician. No more reconstructing three weeks of feeds from memory in a seven-minute appointment while the doctor waits.

Three seconds. One hand. Nobody wakes up.

Wibou is not a medical device and diagnoses nothing. It helps you keep track and understand what you're seeing.

Built without a desk

I built my own workflow to develop from my iPhone, with builds and deployments running remotely, so the work never depended on sitting at a desk.

Underneath, Wibou runs on shared libraries I maintain across all my apps. The foundations are built once, so the time goes into the features parents actually use, and iterating on them takes days, not weeks.

How RevenueCat pays for the night shift

Logging is free, forever: every activity, the full history, the charts and the health record. Wibou Premium adds the guidance (wake windows, mood, weekly recap), WHO percentiles, the PDF export for the doctor, the memories and the reminders. RevenueCat runs all of it:

  • One subscription for the whole family. A purchase belongs to the family, not the phone. When one parent subscribes, the co-parent and the grandparents are unlocked too. RevenueCat identities are tied to the account, not the device.
  • Four placements (end of onboarding, feature gates, profile upsell, limited-time offer), so every paywall entry point can serve its own offering and run its own experiment.
  • Customer attributes for targeting. Baby's age in months, expecting or born, breastfeeding / formula / mixed, family role and size: an expecting parent and the parent of a six-month-old don't see the same offer.

What almost broke

The design. I'm a developer, not a UI/UX designer, and it showed. Designing Wibou was the most fun part of the build, and also the one I got wrong the most: I went through at least five complete versions of the design before landing on this one. Each version looked fine on its own, and each fell apart the moment I used it at night with a baby in my arms.

The hardest part was building something warm without making it precious. Cute at noon becomes unusable at 3am, so every playful decision had to survive the dark: bigger targets, thumb reach, nothing that needs two hands or open eyes.

Sunrise

Wibou is out, and the first year is long.

Wibou launched on the App Store on September 11. It is available worldwide, but the launch was optimized for France first. US localization work, a new set of App Store screenshots and US acquisition start within a week.

Since launch, Wibou has passed 500 new customers in RevenueCat and signed its first paying subscribers within its first week. Daily sign-ups more than doubled in a single day once acquisition started, and after the spike, daily active users stayed several times above their level of the first two weeks: the launch left a returning base behind, not a one-day blip.

Acquisition started on September 24 with organic TikTok, and the first post has passed 95,000 views. For the next few weeks the plan is deliberately simple: keep posting organically and let an unoptimized cohort hit the paywall as it is today, to get an honest baseline conversion. Experimenting before that baseline exists would be guessing. Once it's in, RevenueCat Experiments take over: pricing first, then paywall design.

On the product side, the big pieces ahead:

  • Predicted moments. Wibou already knows the family's rhythm. Next, the timeline shows the coming feed and nap before they happen.
  • An assistant that reads your data. Ask "is she sleeping less this week?" and get an answer grounded in what you logged, not in a forum thread.
  • Weekly and monthly reports for both parents, and for the pediatrician.
  • Childcare mode. Daycare and the nanny become part of the family's day: their hours in the timeline, closed days and who covers, and a day summary shared like a daycare handover sheet.
  • A complete health record: doctor-visit reports and prescriptions attached to each appointment.
  • Home Screen and Lock Screen widgets for Premium families, and pumping in Stats with supply vs. demand for mixed feeding.
  • Memories you can take with you. A short film generated from the baby's milestone photos and monthly portraits, set to music, ready to share with the grandparents or keep for their first birthday. A printable memory book follows. The export engine is already built; it ships once the experience feels as warm as the album itself.

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