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features
design
support

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Description

Naturaltts is a text-to-speech platform for universities, education teams, researchers, and accessibility-focused workflows. It enables organizations to convert text, PDFs, and DOCX files into clear audio through a structured, team-friendly environment built for academic and professional use. With multilingual support, shared workspaces, admin visibility, guided EDU evaluation, and in-dashboard support, Naturaltts helps institutions test and adopt text-to-speech more effectively for accessibility, research, and document-to-audio workflows.

Description

Piper is a rapidly operating, localized neural text-to-speech (TTS) system that is particularly optimized for devices like the Raspberry Pi 4, aiming to provide top-notch speech synthesis capabilities without the dependence on cloud infrastructure. It employs neural network models developed with VITS and subsequently exported to ONNX Runtime, which facilitates both efficient and natural-sounding speech production. Supporting a diverse array of languages, Piper includes English (both US and UK dialects), Spanish (from Spain and Mexico), French, German, and many others, with downloadable voice options available. Users have the flexibility to operate Piper through command-line interfaces or integrate it seamlessly into Python applications via the piper-tts package. The system boasts features such as real-time audio streaming, JSON input for batch processing, and compatibility with multi-speaker models, enhancing its versatility. Additionally, Piper makes use of espeak-ng for phoneme generation, transforming text into phonemes before generating speech. It has found applications in various projects, including Home Assistant, Rhasspy 3, and NVDA, among others, illustrating its adaptability across different platforms and use cases. With its emphasis on local processing, Piper appeals to users looking for privacy and efficiency in their speech synthesis solutions.

API Access

Has API No 

API Access

Has API No 

Screenshots View All

Screenshots View All

Integrations

JSON No 
Python No 

Integrations

JSON Yes 
Python Yes 

Pricing Details

Naturaltts offers a Free Trial for individual evaluation and an EDU Trial for verified schools and universities.
Free Trial Yes 
Free Version No 

Pricing Details

Free
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based No 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux Yes 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) Yes 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

Naturaltts

Founded

2019

Country

Ukraine

Website

naturaltts.org

Vendor Details

Company Name

Rhasspy

Country

United States

Website

github.com/rhasspy/piper

Product Features

Text to Speech

API No 
Adjust Speaking Rate / Pitch Yes 
Audio Optimization Yes 
Custom Lexicons No 
Different Voice Choices Yes 
Multi-Language Support Yes 
Synchronize Speech No 

Product Features

Text to Speech

API No 
Adjust Speaking Rate / Pitch No 
Audio Optimization No 
Custom Lexicons No 
Different Voice Choices No 
Multi-Language Support No 
Synchronize Speech No 

Alternatives

Alternatives

MAI-Voice-2 Reviews

MAI-Voice-2

Microsoft AI
BuildPiper Reviews

BuildPiper

Opstree Solutions