# Amazon Transcribe vs AssemblyAI

> Amazon Transcribe vs AssemblyAI: AssemblyAI is our pick, leading for developers and self-hosted. They split on languages supported and speaker diarization.

![Amazon Transcribe logo](https://www.versusref.com/logos/amazon-transcribe.png) ![AssemblyAI logo](https://www.versusref.com/logos/assemblyai.png)

This is the verified Amazon Transcribe vs AssemblyAI breakdown: Amazon Transcribe (AWS-native STT API with deep AWS ecosystem integration and compliance coverage) and AssemblyAI (Accuracy-led voice AI API for developers and voice agents) are Speech-to-text APIs platforms, priced from $0.006/min and $0.0035/min respectively. The bottom line, head-to-head facts, and true cost tiers follow.

Speech-to-text APIs platforms · 31 facts compared · all sourced · pricing verified Jul 20, 2026

## Bottom line

AssemblyAI takes the overall edge over Amazon Transcribe, winning on developers, self-hosted and voice agents. Compare the two on the use cases you care about before deciding.

## Verdict summary

| Use case | Winner | Why |
| --- | --- | --- |
| Developers | AssemblyAI | For developers embedding transcription into products, pricing is a deciding factor. |
| Dictation | Tie | Both AssemblyAI and Amazon Transcribe are cloud-based transcription APIs, not end-user dictation applications. |
| Self-Hosted | AssemblyAI | For a team that needs to run speech recognition on their own hardware, the single most important question is whether a vendor offers a self-host path. |
| Voice Agents | AssemblyAI | For voice agents, streaming latency is the single most critical factor determining whether a bot sounds natural or robotic. |

## Amazon Transcribe vs AssemblyAI: head-to-head facts

| Fact | Amazon Transcribe | AssemblyAI | Verified |
| --- | --- | --- | --- |
| Batch price per audio minute | 0.006 $/audio-min ([source](https://aws.amazon.com/transcribe/pricing/)) | 0.004 $/audio-min ([source](https://www.assemblyai.com/pricing)) | Jul 20 |
| Streaming price per audio minute | 0.01 $/audio-min ([source](https://aws.amazon.com/transcribe/pricing/)) | 0.008 $/audio-min ([source](https://www.assemblyai.com/pricing)) | Jul 20 |
| Free tier quota | 60 min/mo for 12 months ([source](https://aws.amazon.com/transcribe/pricing/)) | $50 one-time signup credit, no credit card required ([source](https://www.assemblyai.com/llms/pricing.md)) | Jul 20 |
| WER (third-party benchmark) | 4.12 % WER ([source](https://artificialanalysis.ai/speech-to-text)) | 3.02 % WER ([source](https://artificialanalysis.ai/speech-to-text)) | Jul 20 |
| Streaming latency (vendor-claimed) | n/a | ~150 ms ([source](https://www.assemblyai.com/llms/models.md)) | Jul 20 |
| Languages supported | 113 languages ([source](https://docs.aws.amazon.com/transcribe/latest/dg/supported-languages.html)) | 99 ([source](https://www.assemblyai.com/docs/pre-recorded-audio/supported-languages)) | Jul 20 |
| Speaker diarization | ✓  Included ([source](https://docs.aws.amazon.com/transcribe/latest/dg/diarization.html)) | ◑  Paid add-on ([source](https://www.assemblyai.com/pricing)) | Jul 20 |

## Amazon Transcribe vs AssemblyAI pricing: true cost at 3 usage tiers

Monthly bill from published per-minute rates, batch and streaming separately. Sticker rates only; diarization and PII redaction add-ons price in the stack builder.

| Volume | Buyer | Amazon Transcribe | AssemblyAI | Note |
| --- | --- | --- | --- | --- |
| 1K min/mo (batch) | Side project | $6 | $3.50 | About 17 hours of audio. Free tiers may cover part of this. |
| 10K min/mo (batch) | Production app | $60 | $35 | About 167 hours of audio a month. |
| 100K min/mo (batch) | Call-center scale | $600 | $350 | About 1,667 hours. Most vendors negotiate volume rates here. |
| 1K min/mo (streaming) | Side project | $10 | $7.50 | About 17 hours of audio. Free tiers may cover part of this. |
| 10K min/mo (streaming) | Production app | $100 | $75 | About 167 hours of audio a month. |
| 100K min/mo (streaming) | Call-center scale | $1,000 | $750 | About 1,667 hours. Most vendors negotiate volume rates here. |

## Amazon Transcribe vs AssemblyAI: verdicts by use case

### Developers → AssemblyAI

For developers embedding transcription into products, pricing is a deciding factor. AssemblyAI charges $0.0035 per audio minute versus Amazon Transcribe's $0.006 per audio minute for batch work, a meaningful cost difference at scale. On SDKs, Amazon Transcribe offers Python, JS, Java, .NET, Go, Ruby, PHP, C++, Rust, and CLI, while AssemblyAI officially covers only Python and JavaScript, a real gap. Both support WebSocket streaming and word-level timestamps. AssemblyAI accepts 30+ audio and video formats versus Amazon Transcribe's eight batch formats. The lower batch price and broader format support tip the balance toward AssemblyAI, but Amazon Transcribe's SDK breadth keeps this close.

### Dictation → Tie

Both AssemblyAI and Amazon Transcribe are cloud-based transcription APIs, not end-user dictation applications. The deciding factors for voice-typing dictation are which desktop or mobile platforms an app runs on, whether audio is processed locally or sent to the cloud, AI formatting and editing features built into the app, app pricing structure, and native application integrations. None of these attributes are available for either tool: there is no data on consumer dictation app support, platform coverage, on-device processing, in-app formatting, or app-level pricing. Without information on the attributes that matter most for this use case, neither tool can be distinguished from the other.

### Self-Hosted → AssemblyAI

For a team that needs to run speech recognition on their own hardware, the single most important question is whether a vendor offers a self-host path. AssemblyAI explicitly offers a self-host and on-premises option, while Amazon Transcribe does not. That gap alone is decisive for this use case. No amount of Amazon Transcribe's strengths in language coverage (113 languages vs. 99) or concurrency defaults changes the fact that it is a cloud-only service with no deployment option for private infrastructure. Published details on open-weights licensing, hardware requirements, or maintenance status are unavailable for either tool, so those factors cannot add further differentiation, but they do nothing to help Amazon Transcribe, which is already eliminated on the foundational requirement.

### Voice Agents → AssemblyAI

For voice agents, streaming latency is the single most critical factor determining whether a bot sounds natural or robotic. AssemblyAI publishes a 150 ms streaming latency figure, while Amazon Transcribe has no published latency number to compare against. Both tools offer WebSocket streaming, so that aspect is a wash. Pricing is the next deciding factor: AssemblyAI charges $0.0075 per audio-minute for streaming versus Amazon Transcribe at $0.01 per audio-minute, a meaningful 25% cost advantage at scale. On concurrency, AssemblyAI allows 100 new streams per minute on its base plan, while Amazon Transcribe defaults to 25 concurrent streams, a notable gap when running many simultaneous voice agent sessions. Both tools support custom vocabulary for domain-specific terms. The combination of a published low-latency figure and lower streaming cost tips the balance.

## Amazon Transcribe vs AssemblyAI: common questions

### Is AssemblyAI cheaper than Amazon Transcribe?

For batch transcription, AssemblyAI charges $0.0035/audio-min versus Amazon Transcribe at $0.006/audio-min, making AssemblyAI meaningfully cheaper. For streaming, AssemblyAI is $0.0075/audio-min compared to Amazon Transcribe at $0.01/audio-min, again lower. Speaker diarization is included in Amazon Transcribe's base price, while AssemblyAI adds a small charge of $0.000333/audio-min. Overall, AssemblyAI's core transcription rates are lower, but total cost depends on which add-ons you need.

### Does AssemblyAI or Amazon Transcribe have better accuracy based on third-party benchmarks?

AssemblyAI scores a 3.02% word error rate versus Amazon Transcribe's 4.12% in third-party benchmarks, giving AssemblyAI the accuracy edge by that measure. A lower word error rate means fewer transcription mistakes, which matters most for verbatim use cases like legal or medical documentation.

### Is AssemblyAI or Amazon Transcribe better for high-concurrency workloads?

AssemblyAI supports 200+ concurrent async jobs and 100 new streams per minute on its base plan, with higher limits available at no additional cost. Amazon Transcribe defaults to 25 concurrent streams and 250 concurrent batch jobs. For async-heavy pipelines, AssemblyAI's defaults are notably more generous for streaming use cases.

### Does AssemblyAI or Amazon Transcribe include speaker diarization in the base price?

Amazon Transcribe includes speaker diarization at no extra charge. AssemblyAI treats diarization as a paid add-on at $0.000333 per audio minute, adding a small per-minute cost on top of the base transcription rate.

### Which service supports more languages, AssemblyAI or Amazon Transcribe?

Amazon Transcribe supports 113 languages, while AssemblyAI supports 99. Both offer automatic language detection. If your application requires broad multilingual coverage, Amazon Transcribe has a wider selection.

### Can I self-host either of these speech-to-text services on my own infrastructure?

AssemblyAI offers a self-hosted or on-premises deployment option, while Amazon Transcribe is a cloud-only service. For teams with data sovereignty requirements or air-gapped environments, AssemblyAI is the option to evaluate.

### What free trial or signup credit do AssemblyAI and Amazon Transcribe offer?

Amazon Transcribe provides 60 minutes per month for 12 months on its free tier. AssemblyAI gives a one-time $50 signup credit with no credit card required. The right choice depends on whether you prefer ongoing monthly free minutes or a larger upfront credit to test with.

### Does Amazon Transcribe support speech translation?

Amazon Transcribe does not offer a built-in speech translation feature, while AssemblyAI does. If your workflow requires translating spoken audio directly, AssemblyAI covers that natively, whereas Amazon Transcribe would require a separate service to handle translation.

Source: https://www.versusref.com/stt/amazon-transcribe-vs-assemblyai/