How it works
How Tsumo is designed to work.
Tsumo is a small wearable, named for the mahjong move of drawing the winning tile yourself.
What it does
Six things it's designed to do.
Tap any line to see example notifications.
Tsumo12:40Restaurant recognized.
Photo saved to your logbook.Tsumo12:40Salmon grain bowl, from the restaurant's menu online
Tsumo heard12:41"Dressing on the side, and a diet cola."
Used for the estimate. As designed, audio isn't kept.Tsumo12:41Heard "diet cola." Is that right?
Tsumo12:42Noted: dressing on the side, diet cola. About 52 g carbs.
Tsumo12:44You've started eating. Time to check if you need to bolus.
A reminder, shown if you use insulin. The decision is yours; Tsumo never doses.Tsumo1:15 PMAbout 30% of the plate is left, mostly grains. Your logbook now shows about 32 g carbs eaten.
Tsumo7:02 PMEvening meds seen. Logged with a photo.
Tsumo7:02 PMYou picked up your last refill 23 days ago, so you'll likely run out in about 7 days.
On Mom's phone
Tsumo · Alex7:40 PMDinner logged. Evening meds seen.
Tsumo · Alex7:41 PMRefill due in about 7 days.
Tsumo · AlexYesterdayMorning meds not seen by 9:30 AM. Alex got a nudge.
Alex chose to share meals, meds, missed meds and refills.Tsumo7:12 AMA pattern this month
Late workouts have lined up with lower overnight readings.
A pattern to discuss with your care team, not medical advice.Tsumo7:12 AMCoffee after 4 PM lined up with shorter sleep on 5 of 6 nights.
A pattern to discuss with your care team, not medical advice.How it's made matters
It sees the cooking, not just the plate.
The same pasta can act very differently depending on how it's made. As designed, Tsumo would recognize the product you pick up, look up its nutrition facts online, and notice the details that change the math, like the oil in the pan.
Illustrative example, not a live estimate
Penne with tomatoes and spinach
About 70 g carbs
Moderate absorption
- Pasta, little fat: usually a moderate rise
Estimates, not measurements. Tsumo never suggests insulin doses.
Make it yours
Tsumo on its own. More context when you choose.
No watch, ring, band, CGM or pump needed to start. Connect what you already have, set reminders your way, and keep supplies on track.
TsumoEverything you take in, with context. Works on its own.See the meal behind a rise on your glucose curve.
Line up insulin you logged with meals, and keep supply counts honest.
Sleep and heart rate next to your meals, like late dinners and restless nights.
Activity around meals, and reminders on your wrist.
Weight trends next to your meals and activity.
Add your A1C and other lab results, so they sit next to your daily patterns.
Bring in what you already track, only what you allow.
Share meals, meds and refills with the people you choose.
It starts with a short onboarding. As designed, Tsumo would ask what you’d like to connect and share. Everything is optional, and each thing you add helps it get more personal.
All optional. Which devices are supported depends on what we can connect; nothing is connected today. Patterns are something to discuss with your care team, not medical advice.
You decide how it reminds you.
Three ways to set it up. Nothing important changes on its own: Tsumo would only suggest, and you approve.
Concept example
TsumoYour reminderEvening meds at 7:00 PM, every day.
You set it, you can change it anytime.TsumoFrom setupYou said you take your evening meds with dinner. Remind you when dinner starts?
TsumoA suggestionYour evening meds usually come around 7:40 PM, after dinner. Move the reminder to 7:40?
Refills that keep up with real life
It notices when your supplies run out sooner.
Set it up with your refill dates. As designed, with a connected pump it would also notice an early pod or infusion set change, or more insulin used than usual, and move your countdown forward. Without a connection, you'd tap to log the change.
Concept example
TsumoSuppliesYou changed your infusion set a day early, so your sets will run out about a day sooner: in about 7 days, not 8.
Connections and personalization are part of the intended design, still in development.
Concept render made with AI, not a photo of a working device.
Tsumo
Designed to be small enough to forget, and beautiful enough to show.
- ShapeSmall, round and button-like, with a flush lens. Final size is being worked out.
- SensesOne wide lens and a tiny microphone, for meal and med context
- FinishInterchangeable finishes. Wear the color you want.
- PowerThe battery is in the mount, not in Tsumo.
- PauseDesigned so you can pause it whenever you choose.
This is our intended design, not the final product. The shape, finish, size and ways to wear it can still change, and we'd love your input. Share a design idea
Privacy, from the start
Built to be trusted around your table.
Tsumo is in development, and privacy is one of the first decisions we make, not the last. Here is what guides us.
Everything on this page is intended design, still in development.