Guardrails

Profanity filtering, content moderation, and PII redaction at the text and audio level. One API, compliant by default.

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Features

Every protection, built into your timeline

Ship voice AI you can trust in production. Every guardrail you need, built into the API.

PII Text Redaction

Identify and remove personally identifiable information — such as social security numbers, dates of birth — from the transcript before it is returned to you.

PII Audio Redaction

Replace personally identifiable information — such as social security numbers, dates of birth — from the audio files with a "beep" for compliance.

Content Moderation

Detect sensitive content in your audio and video files — hate speech, violence, sensitive social issues, alcohol, drugs, and more.

Profanity Filtering

Identify and redact profane or sensitive terms, keeping your speech-to-text output clean and compliant across any application.

Speech Threshold

Transcribe only files with a minimum percentage of spoken audio.

Start & End of Transcript

Limit transcription to sections containing speech.

Comprehensive protection

Safety, compliance, and operational controls

Enterprise guardrails built into every request, so you can ship to production with confidence.

Safety Guardrails

Catch sensitive content, remove personal information from text and audio, and keep outputs production-clean.

Operational Controls

Speech Threshold and transcript start/end controls validate inputs before they hit the model. Transcribe only what matters, skip what doesn’t, and keep quality consistent at scale.

Compliance ready

Built-in PII Redaction and content controls help you meet GDPR, HIPAA, and PCI requirements. The guardrails regulated teams rely on to ship safely.

Guardrails built in, not bolted on

Model

AssemblyAI One API, every guardrail

Deepgram Limited safety surface

AWS Stitch your own pipeline

PII Redaction, text

Built-in

PII Redaction, audio

Built-in

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Separate pipeline

Content Moderation

Multi-category

—

Toxicity only

Profanity Filtering

All models

Legacy models only

DIY filter

Speech Threshold

Built-in

—

Transcript start/end

Built-in

—

Playground

We’re not playing around, but you can

Put our Voice AI models to the test in our no-code playground.

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Common questions

: Voice AI Guardrails are AssemblyAI's built-in safety features that keep voice pipelines safe and compliant. They include content moderation, PII redaction, profanity filtering, and operational controls like Speech Threshold — all available through a single API.
: Content Moderation for Voice AI detects sensitive or inappropriate topics in audio/video, including hate speech, violence, alcohol, drugs, and more. Results are returned with per-category confidence scores.
: Yes. AssemblyAI supports GDPR and PCI compliance, offers a DPA, and provides PII redaction for both text and audio output so regulated teams can ship safely.
: Enable Guardrails features via options in your transcription request. Each feature can be toggled independently in the API configuration — no separate pipeline required.
: Yes. Select Guardrails features are available with Streaming Speech-to-Text for real-time safety filtering.
: PII Audio Redaction replaces sensitive spans of the original audio file with a "beep" so you can safely store or share recordings for compliance reviews.
: Guardrails coverage varies by feature. PII Redaction and Content Moderation support our core Universal model language set; see the docs for per-feature language availability.