| Grindstone | Project Clock Web | Project Timer | Project Clock Pro | |
| 4.0 | 10.01 | 3.10 | 10.14 | |
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| Freeware | Commercial | Freeware | Shareware | Licence |
| FREE | $35.00 | FREE | $55.00 | Price |
| 10.00 MB | 4.70 MB | 6.46 MB | 9.69 MB | File size |
| Dec 7, 2017 | Apr 16, 2013 | May 26, 2023 | Oct 9, 2017 | Update |
| 21 | 40 | 70 | 29 | Downloads |
| Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64, Windows 10, Windows 10 x64 | Win2000, 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 | Win2000, Windows XP, Windows 7 x32, Windows 7 x64, Windows 8, Windows 10, WinServer, WinOther, Windows 2000, Windows 2003, Windows Server 2000, Windows Server 2003, Windows Server 2008, Windows Server 2008r2, Windows Server 2012, Windows Tablet PC Edition 2005, Windows Media Center Editi | OS |
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