# Sum: Study Timer & Tracker — Pomodoro, calendar, graphs

> Study timer and tracker for managing time by subject with graphs and calendar. (iPhone/iPad app by Nene Nakagawa.)

- Source: https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821 (this page in markdown: same URL + `.md`)
- Developer: [Nene Nakagawa](https://appshunter.io/developer/1821103094)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 18 · 3 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-04-03
- Data updated: 2026-11-09
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews.md

## What is Sum?

This is a simple study timer app that allows you to record and manage your study time by subject.

Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar.

No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies.

[Main Features]
- 3 timer modes (Stopwatch, Countdown, Pomodoro)
- Management of subjects, materials, pages, and notes
- Weekly graphs to check subject balance (bar chart & donut chart)
- Calendar to visualize study days with color-coding
- Display of consecutive study days (streaks)
- Daily study reminder
- Backup and data export functions

[Stackd Pro (One-time purchase)]
- Monthly graphs and cumulative line graphs
- Setting weekly goals and checking achievement rates
- 9 color themes
- Home screen and lock screen widgets
- Real-time timer display on the Lock Screen

## Key features

- Study time tracking
- Subject and material logging
- Weekly progress graphs
- Calendar visualization
- Study streaks
- Pomodoro timer

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


## Is Sum safe?

Not enough ratings yet to assess Sum.

## Is Sum legit?

Sum: Study Timer & Tracker has limited verification signals. The AppsHunter Legitimacy Score for Sum is 58 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews.md

### 5/5 — Nice and easy

*2026-10-28*

The app is exactly what I wanted! I’d like the duration buttons to keep a running total with each click. For example, clicking the 15-minute button three times should add up to 45 minutes.

**Developer response:** Thank you so much for your kind words! I'm really glad the app is just what you were looking for!

Thank you for the suggestion about adding up the time with each button tap, too! I'll keep this in mind as I consider future improvements.

Thanks again for your support!

### 5/5 — LOVE THIS APP

*2026-10-20*

I just got this app today to track my study times in college and it’s perfectttt. It makes my life easy, super cute interface and it’s not overwhelming to navigate. I just love an app that makes my life easier. My one ask tho is to include an option to set weekly hour goals for each subject in addition to the weekly goal. I hope that makes sense. You ate with this app!!!!!!!!

**Developer response:** Thank you so much for your lovely feedback! I'm really happy to hear that you're enjoying the app and finding it helpful for your studies!

Thank you also for the great suggestion! Adding weekly hour goals for individual subjects is something I'm currently considering, and I really appreciate you bringing this up!

Thank you again for your support. It means a lot!

## Frequently asked questions about Sum

### What is Sum's learning methodology?

Sum focuses on self-directed learning by allowing users to track their study time by subject and material. It provides visual feedback through graphs and calendars to help users understand their study habits and balance.

### How does Sum track progress?

Sum tracks progress through weekly graphs that show subject balance and a calendar that visualizes study days with color-coding. It also displays consecutive study days (streaks) to encourage consistent learning.

### Does Sum offer certifications?

Sum itself does not offer certifications. It is designed to help users manage their study time effectively for various goals, including preparing for certifications.

### What are the benefits of the Stackd Pro upgrade?

Stackd Pro, a one-time purchase, unlocks monthly and cumulative graphs, goal setting with achievement rates, 9 color themes, and home screen/lock screen widgets for real-time timer display.

### Is Sum available on Android devices?

Based on the provided data, Sum is currently supported on iPhones. Information regarding Android compatibility is not available.

### How often is Sum updated?

The latest version of Sum is 1.5, last updated on November 6, 2026. This indicates recent development activity, suggesting regular updates.

### Does Sum have ads?

No, Sum does not contain advertisements. The description explicitly states 'No ads' and emphasizes privacy by not requiring account registration.

### What is the age rating for Sum?

Sum has an age rating of 4+, making it suitable for a wide range of users, including younger learners.

## Version history (last 5 releases)

### 1.5 — 2026-11-06

【App Name and Icon Updated】
We've changed the app name from "Stackd" to "Sum" and introduced a new app icon. All your existing records and settings will remain unchanged.

【Search Feature Added】
You can now search your history by subject, study material, or notes.
We've also added subject filtering and the ability to switch months by swiping the calendar.

We've improved performance and made several minor fixes.

### 1.4 — 2026-10-05

【New】
Pro users can now see their active timer in real time on the Lock Screen.

・Stopwatch and countdown: Shows the subject name and elapsed／remaining time
・Pomodoro: Shows the total session time
・When you pause the timer in the app, the Lock Screen display pauses as well

※Due to an iOS limitation, the Lock Screen cannot display transitions between work and break periods in real time for Pomodoro, so it shows the total session time. Work/break transitions and the end of the session are announced by notifications. To see detailed progress, please open the app.

【Change】
Study records are now assigned to the start date instead of the end date.

For example, if you start studying at 11:00 PM on Oct 3 and finish at 1:00 AM on Oct 4, the record will be assigned to Oct 3.

・Records that span midnight will not appear in the “Today” list on the Record tab. You can find them in the History tab under their start date.
・The “Date” field on the record screen is now labeled “Start Date & Time.”
・Existing timer records were saved with a date and time close to when the timer ended. If you want to correct the date of a record that spans midnight, open the record and edit its start date and time.

### 1.3 — 2026-09-05

You can now choose whether the week starts on Sunday or Monday. Change it in Settings > Week Starts On.

### 1.2.2 — 2026-08-22

Improved timer stability and added an FAQ.

・Fixed an issue where the timer could stop unexpectedly on iOS 26
・You can now restore the timer if the app unexpectedly closes while timing
・Added an “FAQ” section to Settings with answers to common questions about how the timer works

### 1.2.1 — 2026-05-27

Minor UI improvements.

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| [FLIP - Focus Timer for Study](https://appshunter.io/ios/app/flip-focus-timer-for-study/id1435127190) | 4.5 (897) | Free | Education |
| [YPT - Study Group](https://appshunter.io/ios/app/ypt-study-group/id1441909643) | 4.7 (1,811) | Free | Education |

## More apps by Nene Nakagawa

- [Looply: Video Habits](https://appshunter.io/ios/app/looply-video-habits/id6763903145)

All apps by Nene Nakagawa: https://appshunter.io/developer/1821103094

## Related topics

[nene nakagawa](https://appshunter.io/ios/topics/nene-nakagawa) · [study tracker](https://appshunter.io/ios/topics/study-tracker)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-09.*