Both are dongles, $24 against $60. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?
The Kiwi Ears Allegro Pro reaches 100 dB on 554 of the 567 models here, the Kiwi Ears Allegro Mini on 547.
| Specification | Kiwi Ears Allegro Mini | Kiwi Ears Allegro Pro |
|---|---|---|
| Power into 32Ω | 30 mW | 68 mW |
| Power into 150Ω | 6.4 mW | 15 mW |
| Power into 300Ω | 3.2 mW | 7.3 mW |
| Power into 600Ω | 1.6 mW | 3.6 mW |
| Output impedance | not published | not published |
| Output noise | 3.0 µV | not published |
| Price | $24 | $60 |
| Headphones it reaches 100 dB on out of 567 | 547 | 554 |
A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.
7 headphones reach 100 dB on the Kiwi Ears Allegro Pro but not on the Kiwi Ears Allegro Mini — Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), HiFiMAN Susvara Unveiled, 4 more.
547 of the 567 models here reach 100 dB on both. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.
Each has a page of its own with every power figure traced to what the maker published and a full headphone list: Kiwi Ears Allegro Mini and Kiwi Ears Allegro Pro. Or put either against your own headphones in the source comparison tool.