Sum of Days

Sum of Days · Habit & health tracker

Track your days.
See what changed.

Your habits, Apple Health data, and personal notes, together in one private record. Turn the days you log into changes you can understand.

Download on the App Store See how Review works

Free to start. Optional Sum of Days+.

iPhone · iPad · Mac · Apple Watch

Formerly JustTrack. Your records and purchases stay with you.

Sum of Days daily dashboard with habits, health values, and personal notes.
A little recorded today. A clearer view over time.
Capture in seconds Numbers, check-ins, notes, goals, custom units, and schedules.
Turn days into perspective Move naturally from today to a month, timeline, or whole year.
Bring health into context See supported Apple Health data beside the things you record.
Keep your history yours No ads, no Sum of Days account, and private iCloud sync.

Review

Your records have something to tell you.

Review looks across what you have recorded and turns it into a concise brief. It can surface meaningful shifts and items that moved together, while leaving the interpretation to you.

Compare useful periods Compare the current week, month, or year with the previous period.
Trace every finding Open the dates and values behind a result whenever you need context.
Calculated on your device Your records stay private. Findings are calculated on your device.
Sum of Days Review showing period comparisons and four on-device findings.
Example records. Each finding opens the dates and values behind it.

Monthly Rewind

A month,
made clear.

Your last 30 days, gathered into one visual summary. Monthly Rewind selects up to three verified findings and puts the comparison beside the change.

Everything is created on your device. Open Review whenever you want the full evidence and dates. Findings appear when there is enough data to support them.

How to review your month
30 DAYS IN PERSPECTIVEIllustrative example

You walked more
this month.

Daily steps averaged 9,400, compared with 8,200 in the previous 30 days.

Previous 30 days8,200
Last 30 days9,400
Example: 30 recorded days in each period. Your summary depends on your own records.

Your history, at every scale.

Record a moment in Day. Find it again in Month, Timeline, or Year. The same history stays connected as you zoom out.

Day view showing today's health, routine, and personal values.

Day

What matters today? Record it quickly and keep every item within reach.

Month calendar showing colorful daily entries.

Month

When did it happen? Scan a calendar and open any day for full detail.

Timeline view showing several days and all recorded item values.

Timeline

What was life like around then? Read complete days together, without hidden values.

Year view showing a colorful map of tracked days.

Year

What shape did the year take? Step back and find the dates worth revisiting.

Item Lens

Understand one thing deeply.

Move from a recent chart to every recorded year while staying focused on one item. Item Lens keeps daily values, ranges, goals, and long-term patterns in the same place.

Chart or calendar Choose the shape that makes the data easiest to read.
7 days to all time Zoom out without losing the underlying entries.
Daily average or sum Use the measure that makes sense for each item.
Year-scale context Spot consistency, gaps, and phases at a glance.
Weight item displayed as a line chart with date ranges. Item Lens year view showing one metric across the year.

At home on iPhone, iPad, Mac, and Apple Watch.

Made for the Apple ecosystem

Capture a moment on Apple Watch, review a day on iPhone, and make sense of a longer history on iPad or Mac. Private iCloud sync keeps the same record close.

Sum of Days Review and findings displayed in a Mac window.
Mac Wider charts, calendars, timelines, and Review.
Sum of Days on iPad with a daily timeline and a detailed item chart side by side.
iPad Browse and inspect without losing context.
Sum of Days overview on Apple Watch.
Apple Watch Check status and record values while the moment is still happening.

Private by design

Your history should remain yours.

Core records stay on your devices and in your private iCloud container when sync is enabled. Review, Monthly Rewind, and Year insights are calculated on-device.

Read the privacy policy
No advertisements No Sum of Days account No tracked records sent to analytics You approve each Apple Health category

Start free.
Make it your own.

No Sum of Days account to create. Start with the core tracker, then choose more flexibility if you need it.

Sum of Days+

More room for your life

  • Unlimited items
  • More icons and colors
  • Custom ranges and goals
  • App locking with Face ID or Touch ID on supported devices

Monthly, yearly, or lifetime access. See current local prices in the app. Subscriptions renew automatically unless canceled.

Make your first
records useful.

Practical ways to start small and learn from what you already record.

Apple Health + daily habits

Put your health data in context.

Bring supported Health values beside the routines and notes you record yourself.

Read the guide →Review + Monthly Rewind

Look back on a month of habits.

Read a change, check the dates, and decide what is worth paying attention to.

Read the guide →

Make your days add up.

Free to start on iPhone, iPad, Mac, and Apple Watch.

Download on the App Store