Both are dongles, $22 against $24. 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 FiiO SnowSky Tiny A reaches 100 dB on 550 of the 567 models here, the Kiwi Ears Allegro Mini on 547.
| Specification | FiiO SnowSky Tiny A | Kiwi Ears Allegro Mini |
|---|---|---|
| Power into 32Ω | 34 mW | 30 mW |
| Power into 150Ω | 7.3 mW | 6.4 mW |
| Power into 300Ω | 3.6 mW | 3.2 mW |
| Power into 600Ω | 1.8 mW | 1.6 mW |
| Output impedance | 0.5 Ω | not published |
| Output noise | not published | 3.0 µV |
| Price | $22 | $24 |
| Headphones it reaches 100 dB on out of 567 | 550 | 547 |
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.
3 headphones reach 100 dB on the FiiO SnowSky Tiny A but not on the Kiwi Ears Allegro Mini — Kinera Freya Vanir, Symphonium Giant, Thieaudio Hype 10.
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: FiiO SnowSky Tiny A and Kiwi Ears Allegro Mini. Or put either against your own headphones in the source comparison tool.