Fast Clock vs World Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fast Clock
This application simulates a fast clock for model railroads. It allows for custom logos and maps, and can synchronize with external systems like JMRI or use real-time.
- Model railroad fast clock simulation
- Custom logo support
- Custom map integration
- JMRI time synchronization
- Real-time clock option
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A model railroad fast clock app Supports custom logos Supports custom maps Can read time from JMRI, the built-in fast clock, or real time
World Clock
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Pin your cities once. Slide time forward or back. See the whole world's clock at a glance. Instantly know who's awake, what day it is for them, and when a moment works for everyone. WHAT YOU GET — Time shift scrubber: drag up to ±12 hours in 15 min, 30 min, or 1 hr steps — Find Best Time: jump straight to the next window when everyone's awake — Flags, local times, UTC offsets, and timezone names for every city — Day/night indicator so you can see at a glance who's asleep — Tomorrow/yesterday badge when a city's date differs from yours — Tap any city's time to copy it to clipboard — One-tap share of the current shifted moment across all your cities, or as an image card — City search from a worldwide database — Reorder and remove cities freely — Dark mode, light mode, 12-hour or 24-hour clock PRIVATE BY DEFAULT Your city list lives on your device. Works offline. No account needed. TimeShift Pro is a one-time purchase, no subscription: unlimited cities (free stays at 12), four premium accent themes, unlimited Find Best Time searches, Share as Card, and two alternate app icons. Built for remote workers, founders, frequent travelers — anyone juggling more than one clock.
Screenshots
Verdict
The clearest difference is in-app purchases: Fast Clock at none against World Clock's 1. Fast Clock also leads on update cadence (every 2 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. World Clock sells 1 one-off in-app purchase. Fast Clock asks for nothing beyond the download.
Fast Clock ships an update every 2 days, World Clock every 5 weeks. The most recent releases landed on September 20, 2026 and September 16, 2026 respectively.
| Parameter | Fast Clock | World Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (5 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 2 days — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 5 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Kevin Snow | Tomash Sugint |
In-app purchases
Fast Clock
No in-app purchases
World Clock
- TimeShift Pro$3.99
Questions
Is Fast Clock free?
Is World Clock free?
Do Fast Clock or World Clock have ads?
Which is updated more often, Fast Clock or World Clock?
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