List your tool
Free

Open Voice OS

Open-source voice assistant framework with a swappable speech-recognition and text-to-speech pipeline – runs offline on anything from a Raspberry Pi to a desktop, free under Apache 2.0.

3.5 Chatbots
3.5 Good 3.5
Fully offline core operation is a genuine privacy advantage over cloud-only assistants Requires technical setup – not a plug-and-play consumer device
Reviewed by Challenging Voice Editorial · Updated Aug 2026 How we rate
PricingFree
Free planYes
CompanyOpen Voice OS
PlatformsWeb
CategoryChatbots
Last reviewedAug 2026

Is this your tool?

  • Claim this listing. Sign in with an email at openvoiceos.org to manage it. Claim Open Voice OS
  • Get into the top 5 of Chatbots. 5 of 5 spots open, from $159/month. See positions
  • Something out of date? Owners can request edits from My listings; anyone can tell us.
Ask AI about Open Voice OS ChatGPT Claude Perplexity

Overview

Open Voice OS is an open-source voice AI platform for building custom voice-controlled interfaces: a speech-to-text engine (choose Vosk or Mozilla DeepSpeech) converts spoken input, NLP processes intent, and a text-to-speech engine (Mimic3 running locally, or Google TTS/Amazon Polly) generates spoken responses, all through a plugin-based architecture.

Running core functions fully offline, with cloud STT/TTS options available but not required, is the feature that sets this apart from commercial voice assistants – a developer or privacy-conscious user can build a voice interface that never sends audio to a third-party server at all, choosing the engine swap only where cloud quality is worth the tradeoff. Customizable wake words, smart-home device control, media playback, and an extensible skills marketplace round it out as a genuinely complete assistant framework rather than a bare speech-recognition library.

Open Voice OS targets developers, DIY enthusiasts, and organizations wanting customizable, privacy-first voice assistants, supporting platforms from Raspberry Pi to desktop computers. It’s completely free and open source under the Apache License 2.0, with optional donations.

Key features

  • Swappable STT engines (Vosk, Mozilla DeepSpeech)
  • Swappable TTS engines (Mimic3 local, Google TTS, Amazon Polly)
  • Offline-capable core voice-assistant functions
  • Customizable wake words and smart-home device control
  • Extensible skills marketplace, plugin-based architecture

Screenshots & demo

Open Voice OS screenshot 1

Pricing

Open Voice OS offers a free plan, with paid upgrades for higher limits and more features.

  • Pricing modelFree
  • Starting priceFree
  • Free planYes
Visit Open Voice OS

Pricing is provided as a guide. Check the official site for the latest plans.

Is Open Voice OS expensive?

Open Voice OS has no advertised paid tier. Among the 69 priced tools we list in Chatbots, the median entry price is $15 a month.

71% of Chatbots tools in the directory offer a free tier, and this is one of them.

Compared against every priced listing in Chatbots, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

Pros

  • Fully offline core operation is a genuine privacy advantage over cloud-only assistants
  • Free and open source under Apache 2.0, no cost barrier
  • Runs on inexpensive hardware (Raspberry Pi) as well as desktops

Cons

  • Requires technical setup – not a plug-and-play consumer device
  • Voice recognition quality depends on which STT engine is chosen (local options trade accuracy for privacy)
  • Smaller skills ecosystem than commercial voice assistants like Alexa or Google Assistant

How it compares

ToolRatingFreeFromBest known for
Open Voice OS (this tool)3.5YesFreeSwappable STT engines (Vosk, Mozilla DeepSpeech)
Wiz Chat2.8YesFreeChat with user-defined AI characters entirely in-browser

Alternatives to Open Voice OS

1 tool matched to Open Voice OS on what it does, its category and its price.

Wiz Chat

2.8

Chat with AI characters you dream up, entirely in your browser – no account, no download, and no server reading your conversations.

Free Chatbots
View details Visit

Head to head: Open Voice OS vs Wiz Chat

Frequently asked questions

What is Open Voice OS?
Open Voice OS is a chatbots tool. Open-source voice assistant framework with a swappable speech-recognition and text-to-speech pipeline – runs offline on anything from a Raspberry Pi to a desktop, free under Apache 2.0.
Is Open Voice OS free?
Yes, Open Voice OS offers a free plan. Paid plans unlock more features and higher usage limits.
What are the best Open Voice OS alternatives?
The closest matches in the directory are Wiz Chat, compared side by side above.

Reviews

3.5 Editorial rating No reviews yet

Write a review