| OpalCalc | Antenna Design Calculator | Machinist Calculator | VBTheory Calculator | |
| 1.94 | 2.3 | 7.11.0 | 5.1 | |
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| Freeware | Freeware | Trialware | Freeware | Licence |
| FREE | FREE | $35.00 | FREE | Price |
| 0.54 MB | 1.60 MB | 6.30 MB | 1.10 MB | File size |
| Sep 28, 2021 | Mar 10, 2010 | Aug 30, 2021 | Jul 1, 2012 | Update |
| 18 | 28 | 17 | 12 | Downloads |
| Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64, Windows 10, Windows 10 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64 | OS |
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