Alloy and Shimmer occupy opposite ends of the personality spectrum. Alloy's measured neutrality works for public-facing utility applications. Shimmer's intimate quality creates personal connections in private contexts. Your choice should reflect the relationship you want users to feel with your content.
All samples use the high-quality tts-1-hd model at 1x speed.
| Characteristic | Alloy | Shimmer |
|---|---|---|
| Style | Neutral | Soft |
| Description | Balanced default voice. Works across most use cases without drawing attention. | Most intimate tone. Suited for personal content and quiet moments. |
| Best Use Cases |
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Alloy suits general use. Shimmer creates intimate, personal connections.
The best way to make your decision is to test both voices with your actual content. Listen to the audio samples above with headphones, and consider generating test clips with your own scripts. Small differences in delivery can have significant impacts on user experience, so investing time in testing upfront will pay dividends.