vioscaleAI
Comparison

Amazon Polly vs eSpeak NG

On the evidence we track, Amazon Polly leads this comparison with a composite score of 74/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Amazon Polly full profile →eSpeak NG full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
★Amazon Polly74
eSpeak NG42
Score
vioscaleAI score
Amazon Polly74 / 100medium · 73%
eSpeak NG42 / 100low · 38%
Pricing
Free tier
Amazon Polly✓
eSpeak NG✓
Model
Amazon Pollyfreemium
eSpeak NGopen_source
Price level
Amazon Pollylow
eSpeak NGfree
Starting price
Amazon Polly$4
eSpeak NG–
Transparent
Amazon Polly✓
eSpeak NG✓
Integrations
Count
Amazon Polly3
eSpeak NG3
Security
Certifications
Disclosure policy
Amazon Polly✓
eSpeak NG–
Fedramp
Amazon Polly✓
eSpeak NG–
Gdpr
Amazon Polly✓
eSpeak NG–
Hipaa
Amazon Polly✓
eSpeak NG–
Iso27001
Amazon Polly✓
eSpeak NG–
Pci
Amazon Polly✓
eSpeak NG–
Scorecard
Amazon Polly–
eSpeak NG4.7
Soc2
Amazon Polly✓
eSpeak NG–
Trust center
Vulnerabilities
Reliability
Status page
Amazon Polly✓
eSpeak NG–
Adoption
Dependent repos
Amazon Polly–
eSpeak NG0
Github stars
Amazon Polly–
eSpeak NG6,945
Activity
Commits last 30d
Amazon Polly–
eSpeak NG42
Release
Cadence days
Amazon Polly–
eSpeak NG799
History
Amazon Polly–
eSpeak NG6 items
License
Spdx
Amazon Polly–
eSpeak NGGPL-3.0
Language
Primary
Amazon Polly–
eSpeak NGC
Market
Availability
Amazon PollyAvailable worldwide
eSpeak NG–
Content
Faq
Amazon Polly7 items
eSpeak NG6 items

Capabilities

Feature-by-feature on the axes that matter for text to speech. “-” means undocumented, not absent.

Capabilities
Voice cloning
Amazon Polly-
eSpeak NG-
Zero shot cloning
Amazon Polly-
eSpeak NG-
Streaming synthesis
Amazon Polly✓
eSpeak NG-
Ssml support
Amazon Polly✓
eSpeak NG✓
Emotion style control
Amazon Polly-
eSpeak NG-
On device offline
Amazon Polly✗
eSpeak NG✓
Open source
Amazon Polly✗
eSpeak NG✓
Watermarking provenance
Amazon Polly-
eSpeak NG-
Cloning consent verification
Amazon Polly-
eSpeak NG-

What each one is

The product in its own terms, so the numbers below have context.

Amazon Polly

Leader

A cloud-based text-to-speech service that transforms written text into spoken audio using neural AI models. Supports multiple languages and voices with customization through markup language tags and pronunciation rules.

Independently observed

eSpeak NG

An open source application that generates audio speech from text, supporting numerous languages across Windows, Linux, and Android systems. It employs sound-generation technology to produce clear but synthesized speech efficiently on computers and mobile devices.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Amazon Polly

Leader
Usage-basedFree tier

From $4.00 per 1M characters (Standard Voices). Four voice type tiers with different pricing. Free tier includes millions of monthly characters depending on voice type.

  • Standard VoicesFree
    • Standard text-to-speech voices
    • SSML support
    • Custom pronunciation lexicons
  • Neural VoicesFree
    • High-quality neural voices
    • Newscaster speaking style
    • SSML support
    • Speech Marks metadata
  • Long-Form VoicesFree
    • Long-form optimized voices
    • Extended synthesis support
    • SSML support
  • Generative VoicesFree
    • Generative voice synthesis
    • Advanced voice quality
    • Bidirectional streaming API
as of verify ↗

eSpeak NG

Open sourceFree tier
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Amazon Polly✓
eSpeak NG✗
Android
Amazon Polly✗
eSpeak NG✓
Windows
Amazon Polly✗
eSpeak NG✓
Linux
Amazon Polly✗
eSpeak NG✓
CLI
Amazon Polly✓
eSpeak NG✓
Deployment
Cloud / SaaS
Amazon Polly✓
eSpeak NG✗
Self-hosted
Amazon Polly✗
eSpeak NG✓
On-premise
Amazon Polly✗
eSpeak NG✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Amazon Polly

Leader
5 total
  • Amazon Connect
  • Amazon Chime SDK
  • AWS Chime SDK
  • Alexa Skills
  • Amazon Chime
Independently observed

eSpeak NG

3 total
  • MBROLA
  • SAPI5
  • C API library integration
Independently observed
Still deciding?

Amazon Polly or eSpeak NG: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.