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| Features | KORG CA30 | KORG CA20 | KORG GA30 | KORG GA20 |
| Tuning | 12 note equal-tempered | 12 note equal tempered | 12 note equal tempered | 12 note equal tempered |
| Tuning Range | C1 to C8 | A0 to B7 | B0 to B6 | B0 to B6 |
| Tuning modes | Meter (Auto) Sound (Manual) | Auto/ Manual | Meter (Auto guitar/bass) Sound (Auto guitar/bass) | Auto (guitar/bass) Manual (guitar/bass) |
| Meter Marks | Show Pure Major/Minor 3rd's | No | No | No |
| Flat tuning function | No | No | YES (Quinta bbbbb) | Yes (Quadra bbbb) |
| Sharp/Flat LED's | YES | YES | YES | YES |
| VU-Style Meters | YES | YES | YES | YES |
| 7 String guitar mode | No | No | YES | No |
| Reference Tone | A4/Bb4, 12 notes | No | Guitar-7B-6E-5A-4D-3G-2B-1E/ Bass-LB-4E-3A-2D-1G-Hc | No |
| Built-in Mic | YES | YES | YES | YES |
| Built-in Speaker | YES | No | YES | No |
| Calibration Range | 410-480 (1 Hz steps) | 430-449 ( 1 Hz steps) | 440 | 440 |
| Tuning accuracy | + / - 1 cent | + / - 1 cent | + / - 1 cent | + / - 1 cent |
| Battery life | 100 hours | 100 hours | 100 hours | 100 hours |
| Power Supply | 2 x AAA (INCLUDED) | 2 x AAA | 2 X AAA (INCLUDED) | 2 X AAA |
| Tilt Slit | YES | No | YES | No |
| Dimensions (W x D x H) | 104mm x 64mm x 15mm | 99mm x 62mm x 15mm | 104mm x 64mm x 15mm | 99mm x 62mm x 15mm |
| Weight | 81g w/batteries | 60g | 81g w/batteries | 60g |
| Auto Power Off | YES | YES | YES | YES |
| Input Jack | 1/4" mono | 1/4" mono | 1/4" mono | 1/4" mono |
| List Price | $34.95 | $32.00 | $24.95 | $22.00 |