I have type 1 diabetes. When I moved out on my own, my numbers got jumpy — jumpy enough that they started deciding things for me. What I could eat, when I could train, whether a day was going to be mine or my blood sugar’s. I got genuinely mad at it.
The thing that actually helped wasn’t a lecture or a meal plan. It was embarrassingly simple: I started writing down what I ate, what I dosed, and what my glucose did for the three hours after. Not to judge myself — just to stop losing the information. Diabetics make hundreds of dosing decisions a month, and before this, I couldn’t have told you how last Tuesday’s burrito went. The data existed. It was just evaporating.
So I built an app for myself that kept the receipts: snap the meal, log the units, let my Dexcom fill in the rest. My time in range went from 73% to 92.6% — without carb-counting spreadsheets, without a new diet, mostly by finally being able to see which of my own habits were expensive. That’s my experience, not a promise; diabetes is stubbornly individual, and what moved my numbers was me acting on my own patterns with my care team. But the seeing part — that’s buildable. So I made it for everyone else too — and then I couldn’t stop. More helpful features kept going in, and somewhere along the way the real experiment became how fun I could make the process: XP, streaks, battles, friends. Turns out the logging sticks when it feels like a game.
The Costco pizza rule
Early on, I trusted one of my own app’s AI carb estimates blind — a Costco pizza slice the model read a little generously — dosed off it, and went low. Lesson learned the diabetic way.
So the app makes sure nobody repeats it. Before CarbLens shows you any prefilled number, you get one big honest warning — “DO NOT DOSE OFF THIS ALONE” — and the AI never recommends insulin doses, period. Double-check the carbs, make the calls with your care team, and let the app do what it’s actually good at: remembering what happened.
The rules the app lives by
- Diabetes can be fun. Diabetes sucks. It consumes a large part of everyone’s life and it is a massive weight to carry. That’s true — and it’s also true that everything is better with friends having a good time. I made this app as a place where that can happen: where we can play the not-so-fun game of diabetes together, in a way that’s more fun.
- Improving your time in range is easier than people think. Most out-of-range time hides in a handful of repeated meals and habits. Once you can see them, the wins come faster than you’d expect.
- We’re not your doctor. Every new user sees that sentence before anything else. CarbLens gives you information; decisions belong to you and your care team.
- The log is what teaches you. Every feature exists to keep the snap-dose-watch loop alive, because the loop is where the learning is.
- No scolding, ever. Highs and lows are biology, not character. The app celebrates progress and stays quiet about the rest.
- Diabetes is less lonely with friends. The feed, the battles, the diabetics-near-you map — they exist because the condition isolates people, and it doesn’t have to.
Who makes this
CarbLens AI is made by Viral Builders — which is, honestly, mostly me and the people who help me ship. Small by design: I use this app every day for my own diabetes, I read every support email, and features get built because diabetics (starting with this one) need them. You can see my other work at iansidman.com, or just email viralbuildersllc@gmail.com — it lands in my inbox, not a ticket queue.
One housekeeping note, because several unrelated apps share our name: this is CarbLens AI, at carblensapp.com, on the App Store here. If you found a “CarbLens” that promises insulin dosing, that’s not us.
— Ian, CarbLens