YOUR LITTLE EVERYDAY COMPANION

Your food. Your habits.
All in the picture.

A place to log the everyday things—and make a little more sense of how they add up.

YOUR EVERYDAY LOG

You handle the food.
We’ll handle the numbers.

Search a food, scan a barcode, or pick a usual. Review the serving, and Calvin brings your calories and macros together.

  • Free, unlimited barcode scanning
  • Protein, carbs, fat—and the finer details
  • Recents and usuals that save you steps
Calvin’s actual Log Food screen with search, barcode scanning, and recent foods
Actual Calvin screen. Example data shown.

SMART LOG · CALVIN PLUS

Describe your meal.
Review the estimate.

Type what you ate, then review the estimated calories, macros, and portions before logging.

Try “2 eggs and 2 slices of toast with butter.”

Calvin Smart Log estimate showing eggs and toast with calories, macros, and editable portions
Actual Calvin screen. Example data shown.

YOUR PROGRESS

The bigger picture.
Not just today’s number.

Put your weigh-ins in perspective. Follow a smoothed trend over time, so a single day doesn’t have to tell the whole story.

  • Your weight history, made clearer
  • Calorie targets informed by your logs
  • Weekly and monthly recaps
Calvin’s actual weight history screen with a trend line and estimated maintenance calories
Actual Calvin screen. Example data shown.

CONNECTED TO APPLE HEALTH

A little movement.
A fuller picture.

Bring steps, workouts, and energy from Apple Health into the same place as your nutrition. You choose what to connect.

  • Steps and active energy from Apple Health
  • See activity against your usual day
  • Health readings alongside your routine
Calvin’s actual activity dashboard with movement, workouts, and active energy
Actual Calvin screen. Example data shown.

RIGHT THERE ON YOUR WRIST

One glance.
Back to your day.

See your calories and macros from your wrist. Apple Watch shows your day and syncs when your iPhone is nearby.

  • Calories and macros at a glance
  • Syncs with your nearby iPhone
  • Included with Calvin free
Calvin’s actual Apple Watch interface with a calorie ring, macros, and heart rate
Actual Calvin screen. Example data shown.

YOUR HEALTH TRENDS

Notice your patterns.
One week at a time.

See the health readings you share with Apple Health, with seven-day trends and a closer look at each measure.

  • Sleep, heart rate, and HRV
  • Breathing rate and more
  • Apple Health data, with your permission
Calvin health trends showing sleep, heart rate, and HRV
Actual Calvin screen. Example data shown.

SLEEP DETAILS

Your sleep,
in detail.

Open a night to see its stage-colored sleep ring, how long you were asleep, and when your sleep began and ended.

  • Awake, REM, light, and deep sleep at a glance
  • Time and share of the night for each stage
  • Total sleep duration and sleep schedule

Requires sleep data in Apple Health. Stages appear when available.

Calvin Sleep detail with a stage-colored sleep ring, time and share for each sleep stage, total duration, and sleep schedule.
Actual Calvin Sleep detail. Example data shown.

Barcodes & food search

Log from a food search or a barcode. Both are included for free, with no scan limit.

Free

Your weight, in perspective

See your logged weigh-ins and follow your trend over time, not just today’s number.

Free

Right on your wrist

Apple Watch displays calories and macros and syncs when your iPhone is nearby.

Free

Apple Health, connected

Bring steps, activity, workouts, and health readings together—with your permission.

Free

Health trends

See sleep, heart rate, HRV, and other Apple Health readings as week-long trends.

Free

Your routine. Your data.

Widgets, Siri, Shortcuts, and CSV export help your log fit into the rest of your day.

Free

Start with a photo

Get an estimate of your meal’s foods and nutrients. Review portions before you save.

Calvin Plus

THAT’S YOUR ROUTINE

Log. Review. Live a little.

01

Log it your way.

Search, scan a barcode, or pick from your usuals. With Plus, start with a meal photo.

02

Give it a quick check.

Review foods and serving sizes before saving. Food databases and AI estimates aren’t infallible.

03

Get back to your day.

Check your macros, activity, and progress when it works for you—not the other way around.

BUILT AROUND YOUR LIFE

More connected.
Still completely you.

Apple Health and Apple Watch, right alongside your nutrition. Your food log lives on your iPhone; optional features use online services. You choose what to connect.

The details on your data
Apple Health
Apple Watch
No account required
Your data, exportable

Life’s full.
Tracking shouldn’t be a handful.

Scan a barcode. Log a meal. Start a routine that feels like you—no account required.

Download on the App Store

Free to download. Optional Calvin Plus.