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Overview

Aradia Audiobooks provides instant access to over 20,000 free public domain audiobooks through LibriVox and Archive.org. The library includes classics in multiple languages, organized by genre, author, and popularity.

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Library Sources

LibriVox Integration

Thousands of volunteer-narrated audiobooks from the LibriVox collection

Archive.org API

Direct integration with Archive.org’s extensive audiobook catalog

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Features

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Multi-Language Support

The app supports audiobooks in 20+ languages including: 
const Map<String, List<String>> _langAliases = {
  'en': ['en', 'eng', 'english'],
  'de': ['de', 'deu', 'ger', 'german'],
  'es': ['es', 'spa', 'spanish'],
  'fr': ['fr', 'fra', 'fre', 'french'],
  'nl': ['nl', 'nld', 'dut', 'dutch'],
  'pt': ['pt', 'por', 'portuguese'],
  'it': ['it', 'ita', 'italian'],
  'ru': ['ru', 'rus', 'russian'],
  'ja': ['ja', 'jpn', 'japanese'],
  'zh': ['zh', 'zho', 'chi', 'chinese'],
  // ... and more
};
Language filters are automatically applied to search and browse results based on your preferences.

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Advanced Search & Filtering

The Archive.org API integration uses advanced query building to fetch audiobooks: 
String _buildAdvancedSearchUrl({
  required String collection,
  String extraQuery = '',
  String sortBy = '',
  required int page,
  required int rows,
}) {
  final lang = _languageQueryClause();
  final sort = sortBy.isNotEmpty ? '&sort[]=$sortBy+desc' : '';

  // Build query with collection, language, and extra filters
  final qParts = <String>[
    'collection:($collection)',
  ];
  if (lang.isNotEmpty) {
    qParts[0] = '${qParts[0]}$lang';
  }
  if (extraQuery.isNotEmpty) {
    final enc = Uri.encodeComponent(extraQuery);
    qParts.add('($enc)');
  }
  final q = 'q=${qParts.join('+AND+')}';

  return 'https://archive.org/advancedsearch.php?$q&fl=$_fields$sort&output=json&page=$page&rows=$rows';
}

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Genre-Based Browsing

Browse audiobooks by genre with intelligent subject mapping:
  • Adventure
  • Biography
  • Children’s Literature
  • Comedy & Humor
  • Crime & Mystery
  • Fantasy
  • Horror
  • Philosophy
  • Poetry
  • Religion
  • Romance
  • Science Fiction
  • War & History
The app uses sophisticated regex patterns to detect genres across languages:
Category Filters (archive_api.dart:369-523)
final Map<String, List<RegExp>> _categoryFilters = {
  'war': [
    // English patterns
    RegExp(r'\bwar(s)?\b', caseSensitive: false),
    RegExp(r'\bworld\s*war(s)?\b', caseSensitive: false),
    // German patterns
    RegExp(r'\bkrieg(e|en)?\b', caseSensitive: false),
    // French patterns
    RegExp(r'\bguerre(s)?\b', caseSensitive: false),
    // And many more languages...
  ],
  // ... other genres
};

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Smart Caching & Performance

The library uses HTTP caching with ETags and Last-Modified headers to minimize bandwidth and improve performance.
class _CacheEntry {
  final String body;
  final String? etag;
  final String? lastModified;
  final DateTime storedAt;
  
  _CacheEntry({
    required this.body,
    this.etag,
    this.lastModified,
    required this.storedAt,
  });
}

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Library Metadata

Each audiobook includes comprehensive metadata:
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title
string
required
The audiobook title
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author
string
Author or narrator name
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description
string
Full description of the audiobook content
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runtime
number
Total runtime in seconds
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rating
number
Average user rating
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subject
array
Genre tags and subject categories
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language
string
Primary language of the audiobook
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downloads
number
Number of times downloaded from Archive.org

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API Fields

The following fields are fetched from Archive.org: 
const _fields = "runtime,avg_rating,num_reviews,title,description,identifier,creator,date,downloads,subject,item_size,language";
20,000+ audiobooks available instantly with no account required!

Next Steps

Learn how to search and filter the audiobook library

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