# Timer Holic vs Keystone Correction

The clearest difference is in-app purchases: Keystone Correction at none against Timer Holic's 1. Timer Holic's advantage is ads (none vs shown) and review sentiment (93% vs 67%). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Timer Holic sells 1 one-off in-app purchase. Keystone Correction asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Timer Holic against 5.0 for Keystone Correction. Both are backed by a comparable volume of ratings — 14 and 5 respectively. Written reviews are what separate them: 93% of Timer Holic's written reviews are positive against 67% of Keystone Correction's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on July 7, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Timer Holic | Keystone Correction |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (14 ratings)](https://appshunter.io/ios/app/timer-holic/id1153908526/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/keystone-correction-comcam/id1504346555/reviews)** |
| Number of ratings | **14** | 5 |
| Positive reviews | **92.9% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 14 MB | 19 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jeong-min Yi](https://appshunter.io/developer/1133862193) | [Masayoshi Shibata](https://appshunter.io/developer/1474388626) |

## What reviewers say

### Timer Holic

[App page](https://appshunter.io/ios/app/timer-holic/id1153908526)

This utility app allows for quick and easy timer setup, focusing on speed and simplicity over extensive features. It supports multiple simultaneous timers and precise second-by-second time setting.

**Highlights:** Quick timer setup, Customizable alert messages, Up to 10 simultaneous timers, Set time by the second, Stopwatch functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade To Full Version | $0.99 | one-time |


### Keystone Correction

[App page](https://appshunter.io/ios/app/keystone-correction-comcam/id1504346555)

Easily scan and auto-correct documents directly on your device. This secure app keeps your images private by not uploading them online, making it ideal for sensitive business use. All functions are available for free, with no registration or complicated steps required.

**Highlights:** Automatic keystone correction, Secure offline processing, Easy document digitization, Free to use all functions, No user registration, Simple interface

**In-app purchases:** none


## Frequently asked questions

### Is Timer Holic free?

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

### Is Keystone Correction free?

Keystone Correction is free to download, with no in-app purchases.

### Which has better reviews, Timer Holic or Keystone Correction?

Keystone Correction is rated higher. Timer Holic averages 4.9 out of 5 from 14 ratings, while Keystone Correction averages 5.0 from 5 ratings.

### Do Timer Holic or Keystone Correction have ads?

Keystone Correction shows ads; Timer Holic does not.

### Which is updated more often, Timer Holic or Keystone Correction?

Timer Holic ships an update every 2 months, and Keystone Correction every 2 months. Most recently, Timer Holic was updated on July 7, 2026 and Keystone Correction on September 16, 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.*