DownClock

iOS Universel / Utilitaires

Ever wondered exactly how long a 4K video will take to upload, or whether your new ISP plan is actually faster? DownClock gives you an instant, accurate answer.

Enter a file size (KB to TB, binary or SI), pick your connection speed from common presets or type your own, and watch the result roll in — days, hours, minutes, seconds.

Built for developers, IT admins, content creators, and anyone comparing ISP plans. No ads. No accounts. No nonsense.

FEATURES
- File sizes from KB to TB — binary (KiB/GiB) and SI units
- Speed presets: 1 Mbps to 10 Gbps
- Compare two ISP providers side by side
- Calculation history
- Protocol overhead slider (TCP/IP + HTTP)
- ISP efficiency slider (advertised vs. actual speed)
- Animated rolling-digit result display
- Light, dark, or system appearance
- iPhone and iPad — portrait optimized
- Zero network requests. Completely private.