# Game Clock Pro vs Underground

The clearest difference is price: Underground at Free against Game Clock Pro's $2.99. Underground also leads on update cadence (every 3 days vs every 3 months) and chart position (#126 vs unranked). Game Clock Pro's advantage is in-app purchases (none vs 5) and ads (none vs shown). On monetization model and device support there is nothing between them.

Underground is free to download; Game Clock Pro costs $2.99 up front. Underground sells 5 one-off in-app purchases. Game Clock Pro asks for nothing beyond the download.

Game Clock Pro ships an update every 3 months, Underground every 3 days. The most recent releases landed on October 10, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Game Clock Pro | Underground |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/underground-bunker-survival/id6778126949/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **100.0% of reviews** | 72.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#126** |
| Size | 3 MB | 35 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Engin Yazilan](https://appshunter.io/developer/1773339613) | [Sunspear Software LLC](https://appshunter.io/developer/1478643604) |

## What reviewers say

### Game Clock Pro

[App page](https://appshunter.io/ios/app/game-clock-pro/id6736820083)

A professional and elegant game clock designed for competitive turn-based games like Chess, Go, and Shogi. Offers tournament-grade accuracy, multiple time systems, and customizable alerts with a premium design and ultra battery efficiency.

**Highlights:** Tournament-grade accuracy, Professional time systems (Fischer, Bronstein, Byoyomi), Premium customizable themes, Ultra battery efficient design, Customizable alerts (beep, voice, silent), Save custom time control presets, Haptic feedback

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

**In-app purchases:** none


### Underground

[App page](https://appshunter.io/ios/app/underground-bunker-survival/id6778126949)

**Currently charting:** #126 Top Paid · Strategy, #141 Top Paid · Simulation (US App Store)

Manage a post-apocalyptic underground bunker, balancing resources, people's needs, and external threats. Build rooms, accept survivors, and guide your community's development through strategic decisions and mini-games.

**Highlights:** Build and manage over 40 types of rooms, Balance essential resources like food, water, and energy, Manage individual survivor skills, health, and stress, Accept or reject new survivors at your gates, Explore tunnels, gather loot, and trade with friends, Engage in mini-games for resources and event outcomes, Play offline with time pausing when the app is closed

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Parts Crate (Small) | $0.99 | one-time |
| Parts Crate (Medium) | $1.99 | one-time |
| Supply Crate (Mixed) | $1.99 | one-time |
| Support the Shelter | $2.99 | one-time |
| Parts Crate (Large) | $3.99 | one-time |


## Frequently asked questions

### Is Game Clock Pro free?

Game Clock Pro costs $2.99, with no in-app purchases.

### Is Underground free?

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

### Do Game Clock Pro or Underground have ads?

Underground shows ads; Game Clock Pro does not.

### Which is updated more often, Game Clock Pro or Underground?

Game Clock Pro ships an update every 3 months, and Underground every 3 days. Most recently, Game Clock Pro was updated on October 10, 2026 and Underground on October 21, 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.*