How Startups Should Evaluate Speech-to-Text APIs for GDPR and SOC 2 Compliance

Startups integrating audio transcription APIs must rigorously vet providers on four key criteria: confirmed EU data processing regions, explicit retention controls, opt-out training data policies by default, and a Data Processing Agreement that accurately reflects actual service use. A SOC 2 report, while useful supporting evidence, does not establish GDPR compliance or guarantee EU data residency. Developers are advised to build a narrow application contract that abstracts the provider, making future vendor swaps possible without disrupting business logic. Policy ambiguities around region, retention, or training defaults should block a release entirely rather than be treated as recoverable errors. When audio cannot leave controlled infrastructure, self-hosted solutions like Whisper remain the recommended fallback.