AI Voice & Speech Comparison

AssemblyAI vs. Vozo

At a glance

AssemblyAI

Best for

Best for developers who need accurate transcription, speech insights or voice agents behind a pay-as-you-go API.

Small and mid-sized
Enterprise

Vozo

Best for

Best for creators and marketing teams republishing video in many languages, including the text on screen.

Freelancers
Small and mid-sized
Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion	AssemblyAI	Vozo
Starting price	lower value From $0.15 / hour of audio Pay-as-you-go, no subscription tiers. Pre-recorded speech-to-text is $0.15 / hour on Universal-2 and $0.21 / hour on Universal-3.5 Pro; streaming is $0.15 / hour on Universal-Streaming and $0.45 / hour on Universal-3.5 Pro Realtime; the Voice Agent API is $4.50 / hour, billed per second of connected conversation. Add-ons such as speaker diarization ($0.02 / hour) and medical mode ($0.15 / hour) are charged on top.	Free tier; paid from $29 / month Plans are metered in AI points rather than flat minutes, so the cost follows how much dubbing, lip sync and visual translation a project uses. Each tier also caps video length and concurrent jobs.
Free trial	$50 in free credits, no credit card required, covering up to 185 hours of pre-recorded or 333 hours of streaming transcription	Free tier with 20 AI points, up to 3 projects
Commercial use	Yes, usage-based	Not stated
Output	Transcripts, structured speech insights and live voice agent conversations	Dubbed and lip-synced video, translated subtitles and translated on-screen text
API	Yes, REST APIs and SDKs	Yes, on Enterprise plans
Languages	99 languages on Universal-2 and 18 on Universal-3.5 Pro for pre-recorded audio; translation across 100+ languages	111 source and 165 target languages
Voice cloning	No, the platform covers speech recognition and voice agents rather than voice creation	VoiceREAL keeps the original speaker's tone in the dubbed track, VoiceNATIVE substitutes a native-accent voice; Voice Studio carries a library of 12,000+ voices
Real-time use	Yes, streaming speech-to-text and a Voice Agent API, alongside batch transcription of pre-recorded files	Not a live pipeline: video is uploaded and rendered as a job, with one concurrent task on the free tier, 2 on Creator and 6 on Studio
Speech-to-speech and dubbing	Yes, the Voice Agent API runs speech-to-speech conversations by orchestrating speech-to-text, an LLM and text-to-speech at one all-inclusive rate	Yes, AI dubbing of uploaded video, with lip sync from the Creator plan
Editing and controls	Speaker identification, diarization, custom formatting, key phrase extraction and guardrails for PII redaction, profanity filtering and content moderation	Yes, rewrite and redub a voiceover by editing text in Voice Studio, plus subtitle generation and embedding, on-screen text translation, and glossary and bulk upload on Studio
Consent and trust	SOC 2 Type 2, ISO 27001, PCI-DSS and a HIPAA BAA included at no premium; EU region available at identical US pricing for GDPR	Built with SOC 2 Type II controls and GDPR-aligned data handling, in the vendor's words; glossary and brand governance sit on Studio, and human review of the delivered output is an Enterprise add-on
MCP-ready	stated Yes	No
Deployment	Cloud (SaaS), Browser-based	Cloud (SaaS), Browser-based
Support	Not stated	Email helpdesk, Chat
Onboarding	Documentation and knowledge base	Not stated
Company size	Small and mid-sized, Enterprise	more entries Freelancers, Small and mid-sized, Enterprise

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Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

Starting price AssemblyAI From $0.15 / hour of audio Vozo Free tier; paid from $29 / month
Free trial AssemblyAI $50 in free credits, no credit card required, covering up to 185 hours of pre-recorded or 333 hours of streaming transcription Vozo Free tier with 20 AI points, up to 3 projects
Company size AssemblyAI Small and mid-sized, Enterprise Vozo Freelancers, Small and mid-sized, Enterprise
Languages AssemblyAI 99 languages on Universal-2 and 18 on Universal-3.5 Pro for pre-recorded audio; translation across 100+ languages Vozo 111 source and 165 target languages
MCP-ready AssemblyAI Yes Vozo No

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

AssemblyAI

Strengths

Pay-as-you-go with no subscription and $50 in free credits to start
99 languages for pre-recorded transcription on Universal-2
Compliance certifications and an EU region at no price premium
Official MCP server exposes transcription and transcript search to AI agents

Limitations

A developer API, not a ready-made studio or editor
No voice cloning or voice creation
Speech Understanding add-ons are billed on top of the base rate, so cost stacks per request
Streaming is billed for as long as the connection stays open, not for the audio sent, and multichannel files are billed per channel
Universal-3.5 Pro covers 18 languages against 99 on the older Universal-2

Vozo

Strengths

Very broad language coverage, 111 source and 165 target languages
Visual Translate rewrites on-screen text and keeps layout and animation
Free tier covers a first project without a card
Two dubbing modes, one keeping the original voice and one using a native accent

Limitations

API access only on Enterprise plans
Metered in AI points, so cost depends on the mix of dubbing, lip sync and visual translation
Each tier caps video length, seats and concurrent jobs
Lip sync and watermark-free export need at least the Creator plan

Plans

Pricing

AssemblyAI

Pay-as-you-go From $0.15 / hour No subscription. Pre-recorded transcription $0.15 / hour on Universal-2 and $0.21 / hour on Universal-3.5 Pro, streaming $0.15 / hour on Universal-Streaming and $0.45 / hour on Universal-3.5 Pro Realtime, Voice Agent API $4.50 / hour. Add-ons are billed on top: speaker diarization $0.02 / hour, medical mode $0.15 / hour, keyterms prompting $0.05 / hour on Universal-3.5 Pro and included on Universal-2. Free accounts get 5 new streams per minute, pay-as-you-go accounts 100.
Custom Not stated Contact sales for custom rate limits, higher concurrency and volume discounts. HIPAA BAA, PCI-DSS, ISO 27001 and SOC 2 Type 2 compliance at no premium, and an EU region at identical US pricing.

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Vozo

Free $0 20 AI points, up to 3 projects, 1 seat, 20 minutes per video.
Creator $29 / month 150 AI points per month, 1 seat, 2 concurrent jobs, 60 minutes per video, watermark removed.
Studio $99 / month 600 AI points per month, 3 seats, 6 concurrent jobs, 120 minutes per video, bulk upload and glossary.
Studio XL Not stated Custom price. 1,500 AI points per month, 6 seats, 12 concurrent jobs.
Studio XXL Not stated Custom price. 4,000 AI points per month, 10 seats, 20 concurrent jobs.
Enterprise Not stated Custom price. Volume discounts, security and compliance, API access and a dedicated account manager.

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What users say

Review Scores · opens after launch

AssemblyAI

Ease of use: Not rated yet
User interface: Not rated yet
Onboarding: Not rated yet
Support and service: Not rated yet
Value for money: Not rated yet
Features: Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Vozo

Ease of use: Not rated yet
User interface: Not rated yet
Onboarding: Not rated yet
Support and service: Not rated yet
Value for money: Not rated yet
Features: Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

AssemblyAI https://www.assemblyai.com · checked against the official source on 2026-08-30

Vozo https://www.vozo.ai · no check date recorded yet

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.