# Sum vs Proof Workshop

The clearest difference is iOS requirement: Proof Workshop at 15.0 against Sum's 18. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Sum | Proof Workshop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 20 MB |
| Requires iOS | 18 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nene Nakagawa](https://appshunter.io/developer/1821103094) | [INPHIL CHOI](https://appshunter.io/developer/6785766361) |

## 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 |


### Proof Workshop

[App page](https://appshunter.io/ios/app/proof-workshop-math-major/id6816328454)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $4.99 | one-time |


## Frequently asked questions

### Is Sum free?

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

### Is Proof Workshop free?

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

### Do Sum or Proof Workshop have ads?

Neither Sum nor Proof Workshop shows ads.

### Which is updated more often, Sum or Proof Workshop?

Sum ships an update every 3 weeks, and Proof Workshop every 3 weeks. Most recently, Sum was updated on November 9, 2026 and Proof Workshop on November 10, 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.*