# Percent calc vs Custom Clocktower

The clearest difference is in-app purchases: Percent calc at none against Custom Clocktower's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Custom Clocktower sells 1 in-app purchase, starting at $0.99 per month. Percent calc asks for nothing beyond the download.

Percent calc ships an update fortnightly, Custom Clocktower every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Percent calc | Custom Clocktower |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/percent-calc-happycuit/id1362040236/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Ad-supported | — |
| Size | 6 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [SuperDG Inc.](https://appshunter.io/developer/635709768) | [WanYeol Park](https://appshunter.io/developer/1882720391) |

## What reviewers say

### Percent calc

[App page](https://appshunter.io/ios/app/percent-calc-happycuit/id1362040236)

This app helps you intuitively calculate various percentage changes, such as financial growth rates, sales increases, salary adjustments, and cost reductions. It's designed for easy use, allowing you to apply different rates and analyze various statistics to understand financial and personal changes.

**Highlights:** Intuitive percentage calculation, Growth rate and yield calculation, Financial asset increase visualization, Business sales growth analysis, Annual salary increase rate application, Smoking reduction calculation, Living cost change rate analysis

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

**In-app purchases:** none


### Custom Clocktower

[App page](https://appshunter.io/ios/app/custom-clocktower/id6800350910)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium — Ad-Free | $0.99 | per month |


## Frequently asked questions

### Is Percent calc free?

Percent calc is free to download, with no in-app purchases.

### Is Custom Clocktower free?

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

### Do Percent calc or Custom Clocktower have ads?

Both Percent calc and Custom Clocktower show ads.

### Which is updated more often, Percent calc or Custom Clocktower?

Percent calc ships an update fortnightly, and Custom Clocktower every 3 weeks. Most recently, Percent calc was updated on October 24, 2026 and Custom Clocktower on October 24, 2026.

---

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