Meet Plumi: a calmer way to track your baby
Why we built a baby tracker for one-handed, in-the-dark logging, and what makes Plumi different from everything else on the App Store.
Hi. I’m Soner. My wife Esra and I have two kids: a daughter who’s five, and a son who’s ten months old.
Plumi started with him.
We did track things with our daughter, five years ago. Just not anywhere. We tracked allergies in our heads, trying to hold on to which new food went in on which day and whether the rash that showed up two days later meant anything. Esra checked every diaper for something that looked off. All of it real, careful work, and all of it stored in two tired brains that disagreed with each other by the weekend.
With our son we were at least honest about it. The first two weeks, feedings and bottles went on paper. An actual sheet of paper on the kitchen counter, times and amounts in two different handwritings. It worked, right up until the paper moved, or somebody fed him while it was in the other room, or we needed to know what last Tuesday looked like and last Tuesday was gone.
So we downloaded a tracker. Then we tried to use it at 3 a.m.
If you’ve ever tried to log a feed while holding a baby who has finally settled, you already know the problem. Most baby trackers were clearly designed at a desk, by someone who wasn’t holding a baby. Tiny buttons. Five taps to log a single diaper. A pop-up asking me to rate the app while our son was mid-meltdown. One of them opened on a full-brightness white screen and woke him, and I stood there in the dark doing the math on whether the data was worth the next forty minutes.
Esra put it best, somewhere around week three:
“I don’t want to use an app. I want to press one thing and put the phone down.”
That turned out to be the whole brief. The problem was never missing features. Every tracker out there has more features than anyone needs. The problem was that none of them were built for the ten seconds you actually have.
So I built her one.
Having a second baby changed what I thought the app was even for. With one baby, you track to learn. With two, you track because nobody in the house can hold it all in their head anymore, and because the question “when did he last eat?” now gets asked by someone who wasn’t in the room.
Designed for one hand, in the dark
Every tile, sheet and timer in Plumi is sized and placed so it works while you’re holding a baby. Big tap targets. No tiny menus. No surprise interruptions.
The Today screen keeps your most-used logs on a quick-action shelf, and that shelf adapts as your baby grows. Our five-year-old and our ten-month-old need completely different buttons, and the app shouldn’t make you go looking for them.
One tap, and it’s logged
The most common logs, a diaper, a feed or a nap, are a single tap from the Today screen. The time is already set, you add at most one value, and you’re done.
The bar was the sheet of paper. Anything slower than picking up a pen was going to lose, and most apps lose badly. This is the part Esra actually uses, and I know because her logs show up on my phone.
Private by default
Here’s the part I’m most stubborn about: your baby’s data stays on your phone.
- No account required
- No third-party analytics
- No ads, and we never sell your data
- Optional end-to-end encrypted sync, off unless you turn it on
- Optional iCloud Drive backup, in your Apple account, not ours
The log inside this app is a record of my own two children. I was never going to be the person who sold it, so I built it so I couldn’t.
What you can track
Plumi covers the whole of your baby’s day:
- Diapers, nursing, bottles, solids and pumping, with notes when a new food doesn’t agree with them
- Sleep, with a Live Activity timer on your Lock Screen
- Growth: weight, length and head circumference, with WHO percentile curves
- Vaccines, temperature, medications and milestones
- Daily checklists with gentle suggestions
- Multiple babies, with fast switching between profiles
That last one exists because our house has two. And the solids notes exist because of the guessing we did five years ago. If you’re starting solids now, here’s how we’d track a reaction rather than trying to remember it.
Still being built, mostly by complaint
Esra still finds things that annoy her, and tells me, and I fix them. Our daughter has decided she’s on the team too. She logs her brother’s diapers whenever she gets hold of my phone, which is both completely wrong and a pretty good usability test.
If you try Plumi and something gets in your way at 3 a.m., tell me. That’s how most of this got built.
— Soner
Updated August 27, 2026