Which should you pick?
Seed Audio 1.0 costs 17 credits (headline rate) and Inworld TTS 2 costs 2 credits (headline rate). One of the two does not publish what a full job costs, only a headline rate, so these two figures are not a like-for-like price comparison.
What a job costs
Seed Audio 1.0
17 credits (headline rate)
It bills per 1,000 characters of input text.
- per 1,000 characters17 credits
Inworld TTS 2
2 credits (headline rate)
It bills per 1,000 characters of input text.
- per 1,000 characters2 credits
All figures are Versely credits. Your plan's credit allowance is on the pricing page.
Spec comparison
| Spec | Seed Audio 1.0 | Inworld TTS 2 |
|---|---|---|
| Provider | ByteDance | Inworld |
| Cost per job | 17 credits (headline rate) | 2 credits (headline rate) |
| Billing | per 1,000 characters of input text | per 1,000 characters of input text |
| Max resolution | — | — |
| Aspect ratios | — | — |
| Durations | — | — |
| Frame rates | — | — |
| Qualities | — | — |
| Requires starting image | No | No |
| Accepts video input | No | No |
| Reference images | — | — |
| Leaderboard | Unranked | Unranked |
| Released | Jun 22, 2026 | May 4, 2026 |
What each one does that the other doesn't
Only Seed Audio 1.0
reference audio, reference image, voice presets, pitch speed control
Only Inworld TTS 2
expressive, research preview, multilingual, 100+ languages, style steering
Both list: text to audio, text to speech.
Full Seed Audio 1.0 spec sheet →
ByteDance Seed Audio 1.0 — high-quality, natural-sounding text-to-speech with preset voices, optional reference audio (@Audio1–@Audio3) or a reference image, and speed/pitch/volume controls.
Full Inworld TTS 2 spec sheet →
Inworld Realtime TTS-2 (Research Preview) — Inworld's most powerful and expressive model. 100+ languages with natural-language style steering for fine-grained delivery control.
Frequently asked questions
Which is cheaper, Seed Audio 1.0 or Inworld TTS 2?+
They are not directly comparable on price: Seed Audio 1.0 costs 17 credits (headline rate) and Inworld TTS 2 costs 2 credits (headline rate), and one of those is a headline rate rather than the cost of a complete job.
What can Seed Audio 1.0 do that Inworld TTS 2 can't, or vice versa?+
Only Seed Audio 1.0 lists reference audio, reference image, voice presets, pitch speed control. Only Inworld TTS 2 lists expressive, research preview, multilingual, 100+ languages, style steering. Both list text to audio, text to speech.
How do Seed Audio 1.0 and Inworld TTS 2 bill?+
Seed Audio 1.0 bills per 1,000 characters of input text. Inworld TTS 2 bills per 1,000 characters of input text. Both are charged in Versely credits.
Try both inside Versely
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