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Categories · Speech-to-Text & Transcription APIs

AssemblyAI vs IBM watsonx Speech to Text

AssemblyAI and IBM watsonx Speech to Text are both Speech-to-Text & Transcription APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. AssemblyAI starts lower at $0.0025 per minute vs $0.02 for IBM watsonx Speech to Text. IBM watsonx Speech to Text offers a free tier while AssemblyAI does not, so IBM watsonx Speech to Text is easier to trial before committing. For coding-agent use, AssemblyAI scores higher on agent-friendliness (70 vs 30).

Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

Data last verified 2026-06-21, with every field cited on each profile.

Head-to-head, from published, cited fields (auto-generated; no paid placement)
FieldAssemblyAIIBM watsonx Speech to Text
Starting price$0.0025 minute$0.02 minute
Pricing modelUsageUsage
Free tier✗✓
Self-serve signup✓✓
SOC 2Type IIType II
HIPAA✓✓
GDPR✓✓
Webhooks✓✓
Sandbox✗✗
Documented actions2217

Full data and citations: AssemblyAI · IBM watsonx Speech to Text. See more Speech-to-Text & Transcription APIs.