AssemblyAI
API platform for converting audio to text and building voice-powered applications
- Also known as
- assemblyai
Available worldwide · Popular in: US, GB
What is AssemblyAI?
A hosted service offering speech-to-text transcription across 99 languages with real-time and batch processing, speaker identification, sentiment analysis, and infrastructure for building voice agents.
AssemblyAI pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
Free tier with limited hours; pay-as-you-go from $0.45/hr
Free
Free- streaming_hours_per_month
- 333
- pre_recorded_hours_per_month
- 185
Pay-as-you-go
Enterprise
Contact salesCustom volume pricing and terms
What AssemblyAI does
The capabilities that matter for speech to text, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Real time streaming
- ✓
- Speaker diarization
- ✓
- Custom vocabulary
- ✓
- Fine tuning
- -
- Word timestamps
- ✓
- Punctuation formatting
- ✓
- Pii redaction
- ✓
- Vertical model
- -
- Offline on device
- -
- Open source
- -
Platform & deployment
Independently observed- Web
- Cloud / SaaS
- Self-hosted
Integrations (13)
Independently observed- Semantic Kernel→•
- LangChain•
- Twilio
- OpenAI
- MiniMax
- Fireworks
- AWS Bedrock
- Google Cloud Storage
- Semantic Kernel .NET
- Vercel AI SDK
- OpenAI GPT-5.6 Luna
- OpenAI GPT-5.6 Terra
- Google Gemini
Security & compliance
Independently observed- SOC 2 Type 2 · Type IIactive · independent third-party
AssemblyAI FAQ
Common questions about AssemblyAI, answered from independent, dated evidence.
What is AssemblyAI?
A platform providing speech-to-text APIs for both pre-recorded and live audio, voice agent capabilities, and audio analysis features like speaker identification and sentiment analysis. Serves millions of developers with focus on accuracy and scalability. It is indexed under Speech To Text.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
Is AssemblyAI free?
AssemblyAI offers a free tier, so you can start without paying. Paid plans start at $0.37. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
What platforms does AssemblyAI support?
We have confirmed browser-based access to AssemblyAI. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
Can AssemblyAI be self-hosted?
Yes. AssemblyAI can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
What does AssemblyAI integrate with?
We have confirmed 5 integrations for AssemblyAI, including Semantic Kernel .NET, Vercel AI SDK, OpenAI GPT-5.6 Luna, OpenAI GPT-5.6 Terra and Google Gemini. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
What security certifications does AssemblyAI have?
We have independently confirmed SOC 2, HIPAA and GDPR for AssemblyAI. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as AssemblyAI not holding them. Always confirm compliance directly before you rely on it.
Source: https://www.assemblyai.com/blog/assemblyai-obtains-soc2-type-2-compliance-for-2022-2023
Where is AssemblyAI available?
AssemblyAI is available worldwide. Its primary markets are the United States and the United Kingdom.
Source: https://www.assemblyai.com/blog/lower-latency-new-pricing
AssemblyAI alternatives
Other speech to text we track, ranked by the same independent score.
- SpeechmaticsSpeech recognition API for voice-driven applications and AI assistantsmedium · 54%
- Deepgrammedium · 55%
- whisper.cppRun speech transcription offline on any hardwarelow · 34%
- faster-whisperA faster, open-source implementation of speech-to-text transcriptionlow · 33%
- Amazon TranscribeConvert spoken audio and video into text using cloud-based automatic speech recognitionlow · 45%
- VoskOpen-source offline speech recognition toolkit for mobile devices and serverslow · 39%
Compare AssemblyAI
Side by side against other speech to text, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for AssemblyAI, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Security posture | 75 | 0.12 | 9.2 | ✓ |
| Reliability | 95 | 0.07 | 6.5 | ✓ |
| Pricing transparency | 100 | 0.05 | 5.4 | ✓ |
| Price level | 80 | 0.04 | 3.3 | ✓ |
| Capabilities | 81 | 0.04 | 3.1 | ✓ |
| Integrations | 27 | 0.04 | 1.2 | ✓ |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 7 items | mediumsource · 2026-09-10 · 64% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pii redaction, Word timestamps, Custom vocabulary, Real time streaming, Speaker diarization, Punctuation formatting | mediumsource · 2026-09-29 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 8 | mediumsource · 2026-09-29 · 60% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | highsource · 2026-09-29 · 75% |
Pricing
Reliability
Security
| Attribute | Value | Evidence |
|---|---|---|
| Trust center | https://www.assemblyai.com/security | mediumsource · 2026-09-29 · 60% |
| Disclosure policy | Yes | mediumsource · 2026-09-29 · 60% |
| Gdpr | Yes | highsource · 2026-08-19 · 75% |
| Hipaa | Yes | highsource · 2026-09-29 · 75% |
| Pci | Yes | highsource · 2026-08-19 · 75% |
| Soc2 | Yes | highsource · 2026-09-29 · 75% |
| Certifications | SOC 2 Type 2 | mediumsource · 2026-09-29 · 60% |
Is AssemblyAI the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank AssemblyAI against the rest of the speech to text we index, using the same dated evidence weighted your way.
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