Grok Speech (STT + TTS APIs) vs Gamma

Which one should you pick? Here's the full breakdown.

Our Pick

Grok Speech (STT + TTS APIs)

A
8.1/10

xAI's standalone voice APIs -- launched 2026-04-17. Built on the stack that powers Grok Voice, Tesla vehicles, and Starlink customer support. $0.10/hr STT batch, $4.20 per 1M characters TTS, 25+ languages, word-level timestamps + speaker diarization

Gamma

B
7.9/10

AI presentation maker that turns prompts into polished, web-native decks in minutes

CategoryGrok Speech (STT + TTS APIs)Gamma
Ease of Use7.09.0
Output Quality8.57.5
Value9.08.0
Features8.07.0
Overall8.17.9

Pricing Comparison

FeatureGrok Speech (STT + TTS APIs)Gamma
Free TierNoYes
Starting Price$0.10$0

Which Should You Pick?

Pick Grok Speech (STT + TTS APIs) if...

  • ✓Higher output quality (8.5 vs 7.5)
  • ✓Better value for money (9/10)
  • ✓More features (8 vs 7)

Developers building voice agents, real-time transcription tools, accessibility features, or high-volume TTS workloads where the cost per hour of audio actually matters at scale. Strong fit for phone-call and meeting transcription use cases where xAI's published WER advantage (5.0% on phone-call entities vs. ElevenLabs 12.0%) compounds quickly.

Visit Grok Speech (STT + TTS APIs)

Pick Gamma if...

  • ✓Easier to use (9 vs 7)
  • ✓Has a free tier

Startup founders pitching investors, marketers building quick client presentations, and anyone who needs a solid deck fast without touching PowerPoint.

Visit Gamma

Our Verdict

Grok Speech (STT + TTS APIs) and Gamma are extremely close overall. Your choice comes down to specific needs -- Grok Speech (STT + TTS APIs) is better for developers building voice agents, real-time transcription tools, accessibility features, or high-volume tts workloads where the cost per hour of audio actually matters at scale, while Gamma works best for startup founders pitching investors, marketers building quick client presentations, and anyone who needs a solid deck fast without touching powerpoint.