Echo and Shimmer represent opposite ends of the vocal spectrum. Echo commands attention with depth and authority. Shimmer invites closeness with softness and intimacy. Your choice depends entirely on the relationship you want to create with listeners.
All samples use the high-quality tts-1-hd model at 1x speed.
| Characteristic | Echo | Shimmer |
|---|---|---|
| Style | Deep | Soft |
| Description | Low and authoritative. Natural fit for narration and documentary content. | Most intimate tone. Suited for personal content and quiet moments. |
| Best Use Cases |
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Echo is authoritative. Shimmer is soft and personal.
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.