| HiClock Pro | 1st Atomic Time | Atomic Clock Sync | Chronos Atomic Clock Synchronizer | |
| 3.19 | 3.0 | 3.5.0.0 | 5.4.0 | |
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| Shareware | Shareware | Freeware | Freeware | Licence |
| $19.95 | $19.99 | FREE | FREE | Price |
| 1.03 MB | 1.09 MB | 0.87 MB | 0.53 MB | File size |
| Dec 2, 2004 | Jun 20, 2009 | Sep 25, 2012 | Apr 3, 2017 | Update |
| 24 | 58 | 39 | 36 | Downloads |
| Windows XP, Windows 2000, Windows 2003 | Windows XP, Windows 2000, Windows 2003, Windows Tablet PC Edition 2005, Windows Media Center Edition 2005, Windows Vista, Win | Windows 7 x32, Windows 7 x64, WinServer, Windows Vista, Windows Vista x64, Windows XP | Win2000, Windows XP, Windows 7 x32, Windows 7 x64, Windows 8, Windows 10, WinServer, WinOther, Windows Vista, Windows Vista x64 | OS |
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