Glucose Challenge : Carb Log
Snap meals, track carbs & A1c
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Enter your goal weight for a daily carb target and a plan. Snap your meals — AI estimates the carbs and suggests recipes matched to your intake. Healthcare-supervised.
Get your daily carb target from your goal weight.
Build blood-sugar-care habits — no needles required.
Understanding blood sugar has traditionally meant wearing a
sensor on your arm. Glucose Challenge helps you build lasting
habits through your daily meals and actions — no sensor needed.
■ Start with your goal weight
Enter your current and goal weight, and we'll suggest a daily
carb target that fits you (Gentle 130g / Recommended 100g /
Strict 70g).
If you have a larger gap to close, we suggest starting with a
sustainable target and stepping down after a month. Strict
limits mean nothing if you can't keep them up.
That target becomes the goal line on your daily graph — so you
always know how much you have left today.
■ Built on data from 300+ participants
Since 2020, over 300 people have worn a medical glucose sensor
(FreeStyle Libre) while logging their meals and daily actions.
That data shows, in numbers, which habits raise blood sugar and
which ones help prevent spikes.
A healthcare professional reviews that data and turns it into
the actions you should take today.
■ Blood sugar isn't only about food
Sleep, exercise, stress — all of it affects your blood sugar.
So the habits you receive go beyond what's on your plate.
■ Two things to do each day
【1. Photograph your meal】
One photo is all it takes. AI estimates the carbs — no typing,
no calculating. Every entry stacks up on your graph, so you can
see at a glance whether you've passed your target.
【2. Check off today's actions】
"Vegetables first." "A short walk after eating." Habits arrive
each day. Just tap whether you did it or not.
■ These two become your scores
Your logged carbs and your habit completion rate feed into your
Glycation Score and Spike Score. Your estimated HbA1c and
5-year diabetes risk appear on the dashboard too.
No needles — and you can still see where you stand, in numbers.
That's what 300+ participants' real data makes possible.
■ The longer you go, the further you get
Your avatar evolves from Lv1 to Lv3 as your completion rate
rises, and each level unlocks the next stage of habits. You
start where you are, and build from there.
■ No more wondering what to eat
Pick your goal (clear skin, weight care, anti-aging, wellness,
diabetes prevention) and your situation (weekday lunch, dinner),
and you'll get specific options for convenience stores, dining
out, and home cooking.
Repeat it daily, and eventually you'll choose well without
opening the app. That's the goal of this program.
■ Also included
・Daily and weekly weight graphs with a goal line
・Carb breakdown per meal, plus advice to help prevent spikes
【Who this is for】
・You spend on skincare, but your skin still isn't where you want it
・You've tried diets before and gained it back
・Your blood sugar or HbA1c came up at your last checkup
・You're busy, and detailed logging or calorie counting never sticks
【Subscription plans】
A 3-day free trial gives you access to everything.
・Basic (¥1,100/mo): Unlimited AI photo analysis, daily habits,
dashboard
・Standard (¥1,650/mo): Basic plus meal programs for weight care,
beauty, anti-aging, and wellness
・Premium (¥2,200/mo): Everything, including the healthcare-
supervised diabetes-prevention program and 5-year risk insights
*Results vary by individual. No outcome is guaranteed.
【Medical disclaimer】
Estimated HbA1c, diabetes risk scores, and AI meal analysis in
this app are simulations based on the data you enter. This app
is not a medical device and does not provide medical diagnosis
or definitive test results. For accurate measurement or any
health concerns, please consult a physician.
Terms: https://health-app-policy.quiet-time.jp/kiyaku
Privacy: https://health-app-policy.quiet-time.jp
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
・Build your own carb plan from your goal weight
We calculate your BMI from your height and weight, then suggest a daily carb target, a timeline, and step-by-step stages
If a goal could harm your health, we suggest a safer one instead
・More detailed low-carb recipes
Based on your carb intake over the last 7 days, we suggest specific options for convenience stores, eating out, and home cooking
・The rice or noodle portion you select now adjusts the carb estimate
・Clearer results, including a rice-cup equivalent for your carbs
・Fixed an issue where some meals were saved to the wrong date depending on the time of day
・Other display and usability improvements
The developer, Kengo Nomura, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Financial Info
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kengo Nomura
- Size
- 62.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Premium Coupon 50 $5.99
- Premium Coupon 25 $9.99
- Premium Plan $11.99
- Standard Plan $9.99
- Basic Plan $5.99
- Copyright
- © 野村賢吾