SkyChrono vs World Time Map
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SkyChrono
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SkyChrono is a real-time astronomical dashboard for anyone who plans around the sky—astronomers, astrophotographers, navigators, and curious stargazers. SUN • Live altitude & azimuth • Sunrise, sunset, and solar noon • Civil / nautical / astronomical twilight • Current lighting state (day, twilight, night) + day length MOON • Current phase with illumination % • Moonrise & moonset • Live altitude & azimuth • Phase progression at a glance TIME SYSTEMS • Local time + timezone • UTC • Julian Date (JD) / Modified Julian Date (MJD) • Greenwich Mean Sidereal Time (GMST) • Local Sidereal Time (LST) LOCATION • Automatic GPS position (optional) • Manual coordinates anywhere on Earth • Decimal degrees or DMS input ALERTS & NIGHT MODE • Notifications for sunrise/sunset, twilight boundaries, golden hour, and major moon phases • Night Vision mode (red theme) to preserve dark adaptation EXPORT & LEARN • Save the dashboard as a high-resolution image • Export data as JSON, or copy any value with a tap • Built-in explanations for key astronomy concepts PRIVACY FIRST • No ads, no subscriptions • No tracking—your location stays on device • Manual location mode for complete control SkyChrono helps you pick the right moment—whether you’re planning a shoot, observing, or learning celestial mechanics.
World Time Map
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Compare world times fast, check local time abroad, and avoid DST or date-change mistakes with a clear world clock built for travel, overseas contact, and everyday international use. Best for - Checking local time before travel, messages, or calls - Comparing cities and dates at a glance - Finding the right contact window for friends, family, and global teams What you can do - Add cities and compare live local times in one list - See time differences from your base city at a glance - Set a reference date and time to preview local time anywhere - Reorder and remove cities to keep your list focused Why people use it - Faster than searching each city one by one - Easier to avoid DST and date-shift mistakes - Simple enough for daily use without extra setup Download WorldTimeMap to compare city times clearly and stay in sync across time zones.
Screenshots
Verdict
The clearest difference is ads: SkyChrono at none against World Time Map's shown. On price, in-app purchases, 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | SkyChrono | World Time Map |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Bian Dhoan Kwik | YOSHIKI OSHIMA |
In-app purchases
SkyChrono
No in-app purchases
World Time Map
No in-app purchases









