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Libyx Review

Libyx is a desktop application that translates EPUB and PDF documents using user-supplied API keys from various AI providers.

shipped Sep 6, 2026codepaid
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Libyx — product screenshot

Why it matters

1Translates EPUB and PDF documents into 57 languages.
2Utilizes user's own API keys for AI providers like OpenAI, Anthropic, and Google.
3Operates locally on the user's machine, ensuring data privacy.
4Version 0.4.0 released on September 4, 2026, addressed translation passage issues.

About Libyx

Business Model
Hybrid (Subscription + Usage)
Usage Pricing
Under $1 in batch mode per book
Founded
2026
Team Size
1
Funding
Bootstrapped
Platforms
macOS, Windows
Target Audience
Readers and professionals needing on-demand translations

Pricing Plans

Batch Mode
Under $1 per book / per-job
  • • 50% discount for batch translations
  • • Estimates translation costs upfront
  • • No account creation required
Typical Cost
A few dollars for higher quality models / per-job
  • • Direct payment to AI provider
  • • Real-time cost tracking

Cost Examples

  • • Translate one book: ~$1
  • • Use of high-quality model: $3

Screenshots

overview

What is Libyx?

Libyx is an AI-powered desktop application developed by blackislandcrew that enables readers and professionals to translate entire EPUB and PDF documents into 57 languages. It operates locally on the user's machine, utilizing the user's own API keys for various AI providers, emphasizing privacy and control over data.

features

Key Features of Libyx

Libyx provides a suite of features designed for comprehensive document translation, focusing on user control and privacy.

  • Supports translation of EPUB and PDF formats into 57 languages.
  • Allows users to select from various AI providers (e.g., Anthropic, OpenAI, Google, Mistral) using their own API keys.
  • Operates fully locally on the user's machine, ensuring no user data passes through Libyx servers.
  • Rebuilds PDF typography into EPUB format before translation, allowing for pre-translation corrections.
  • Offers batch processing discounts, providing a flat 50% off on input, output, and cached tokens at supported providers.
  • Estimates translation costs upfront and displays actual costs per chapter in dollars.
  • Builds a glossary and voice profile for each book to maintain consistent names, tone, and invented terms.
  • Enables conversion of web articles/links into a single EPUB for translation.

use cases

Who Should Use Libyx?

Libyx is primarily designed for individuals and professionals who require efficient and private translation of long-form documents.

  • Readers: For translating EPUB books and PDF documents into their native language for personal reading on any e-reader.
  • Professionals: For translating professional documents while maintaining data privacy and control over AI costs.
  • Language Learners: For accessing literature in new languages or translating content to aid language acquisition.
  • Content Curators: For converting web articles or links into a single EPUB for translation and offline reading.

how to use

How to Use Libyx

Libyx is a desktop application that requires installation on macOS or Windows. Users initiate translations by importing documents and configuring their AI provider API keys.

  • 1Download and install the Libyx desktop application for macOS or Windows from libyx.app.
  • 2Obtain API keys from preferred AI providers such as OpenAI, Anthropic, Google, Mistral, DeepSeek, or OpenRouter.
  • 3Launch Libyx and input the obtained API keys into the application's settings.
  • 4Import an EPUB or PDF document into Libyx for translation.
  • 5Select the desired target language and AI model for translation.
  • 6Review the estimated cost and initiate the translation process.

pricing

Libyx Pricing & Plans

Libyx operates on a 'bring your own API key' model, meaning users do not pay a subscription fee to Libyx. Instead, users are responsible for the costs incurred with their chosen AI provider, which are typically usage-based.

  • Batch Mode: Under $1 per book (for input, output, and cached tokens with a 50% discount at providers like Anthropic, OpenAI, Google, and Mistral).
  • Typical Cost (higher quality models): A few dollars per book, depending on the chosen AI provider and model quality.

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Pros

  • +Ensures high data privacy as it operates locally and uses user-supplied API keys, with no data passing through Libyx servers.
  • +Offers significant cost savings for large volumes of translation by leveraging direct AI provider API pricing, often under $1 per book in batch mode.
  • +Preserves document formatting and structure, especially for PDFs, by rebuilding typography into EPUB before translation.
  • +Provides consistency in translation through built-in glossaries and voice profiles for names, tone, and invented terms.
  • +Supports a wide range of AI providers (e.g., OpenAI, Anthropic, Google, Mistral) allowing users to choose their preferred model.
  • +Translates into 57 languages, making a broad array of content accessible.

Cons

  • −Requires users to obtain and manage their own API keys from various AI providers, which can be a barrier for some users.
  • −As a desktop application, it requires installation and is not accessible via a web browser.
  • −The cost of translation is dependent on the chosen AI provider's pricing, which can vary and is not directly controlled by Libyx.
  • −Lacks widespread independent user reviews or public reception due to its niche, privacy-focused model and one-person development.

Similar Tools

Libyx vs Competitors

Libyx distinguishes itself from other translation tools through its local operation, BYO API key model, and specialized document handling.

1
DocTranslator (by DeepL)↗

This is DeepL's official document translation service, offering high-quality translations for various document formats directly through their web interface.

While not a desktop application in the same vein as Libyx, DeepL's DocTranslator offers a very similar job-to-be-done for document translation. It uses DeepL's own powerful translation engine rather than your API key, meaning you're tied to their ecosystem and pricing model, but it offers a polished, integrated experience.

2
OpenAI API Playground (for text extraction and translation)On Stork

While not a dedicated document translator, the OpenAI API Playground allows users to directly interact with OpenAI's models for text extraction and translation, offering maximum flexibility.

This is a more manual, 'build-your-own-workflow' approach compared to Libyx. You would need to manually extract text from your PDF/EPUB documents, paste it into the Playground, and then translate it, lacking the integrated document handling of Libyx. However, it offers direct control over the translation prompts and models if you already have an OpenAI API key.

See every Libyx alternative, compared→

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