AssemblyAI

About AssemblyAI

AssemblyAI is a speech intelligence API company founded in 2017, offering a comprehensive suite of audio AI capabilities beyond simple transcription. Its API covers automatic speech recognition, speaker diarisation, chapter detection, summarisation, sentiment analysis, entity detection, PII redaction, and topic detection — all accessible through a single API endpoint. The platform is particularly well-regarded by product teams building audio-native features into SaaS applications, podcasting tools, call centre analytics, and meeting intelligence products. AssemblyAI trains its own speech models and regularly benchmarks against competing transcription providers. AssemblyAI is incorporated in Delaware and headquartered in San Francisco. Data submitted to its API is processed on US-based infrastructure. The company does not prominently offer EU data residency as a self-serve option, which is a limitation for European businesses subject to strict data localisation requirements. The platform holds SOC 2 Type II certification and offers a Data Processing Agreement for customers operating under GDPR. It does not train its models on customer audio data, a key assurance for businesses handling personally identifiable speech content. PII redaction is available as an API feature, which can help reduce data risk before audio is processed. As a US company subject to the CLOUD Act, European enterprise customers — particularly in healthcare, legal, or financial services — should assess their legal basis for transferring audio data to US processors and ensure appropriate Standard Contractual Clauses are in place. Pricing follows a usage-based model with a free tier providing $50 in credit. Paid usage is billed per audio minute transcribed, with rates starting at $0.37/hour for standard transcription. Enterprise plans offer volume discounts, dedicated support, and enhanced security arrangements suitable for high-compliance deployments.