# Sum vs Study Time Memo

The clearest difference is ads: Sum at none against Study Time Memo's shown. Sum also leads on update cadence (every 3 weeks vs every 6 weeks). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Sum sells 1 one-off in-app purchase and Study Time Memo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Sum against 5.0 for Study Time Memo. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Sum ships an update every 3 weeks, Study Time Memo every 6 weeks. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Sum | Study Time Memo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/study-time-memo-subject-log/id6794255516/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 3 MB | 5 MB |
| Requires iOS | 18 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nene Nakagawa](https://appshunter.io/developer/1821103094) | [丽佳 施](https://appshunter.io/developer/1894580777) |

## What reviewers say

### Sum

[App page](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821)

Track and manage your study time by subject with a simple timer. Log sessions, add notes, and visualize your progress with weekly graphs and a calendar. Focus on learning without distractions.

**Highlights:** Study time tracking, Subject and material logging, Weekly progress graphs, Calendar visualization, Study streaks, Pomodoro timer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

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


### Study Time Memo

[App page](https://appshunter.io/ios/app/study-time-memo-subject-log/id6794255516)

Manually log your study sessions by subject and duration. Track your progress with weekly charts, streaks, and per-subject totals. Export your data for easy review.

**Highlights:** Register custom subjects, Manual minute logging, Add notes and dates, Weekly study charts, Per-subject totals, Day streaks, Home screen widget

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Sum free?

Sum is free to download, with in-app purchases available.

### Is Study Time Memo free?

Study Time Memo is free to download, with in-app purchases available.

### Which has better reviews, Sum or Study Time Memo?

Sum and Study Time Memo are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Sum or Study Time Memo have ads?

Study Time Memo shows ads; Sum does not.

### Which is updated more often, Sum or Study Time Memo?

Sum ships an update every 3 weeks, and Study Time Memo every 6 weeks. Most recently, Sum was updated on November 9, 2026 and Study Time Memo on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*