📊 Our Test Results:
- 🎯 Qualité vocale : Altered studio-grade output vs NaturalReader standard TTS — Altered wins
- ⚡ Voice Cloning Speed: Altered clones in seconds vs NaturalReader basic cloning — Altered wins
- 🔒 Formats de fichiers pris en charge : NaturalReader reads 20+ formats vs Altered audio-only — NaturalReader wins
- 📝 Real-Time Voice Change: Altered ultra-low latency vs NaturalReader no live option — Altered wins
- 💰 Pricing Value: Altered $30/mo Creator vs NaturalReader $49/mo Single — Altered wins
Picking the right AI voice tool can feel overwhelming.
NaturalReader and Altered both use AI to work with voices.
But they solve very different problems.
NaturalReader reads your documents out loud.
Altered transforms your voice into something completely new.
One is built for listening. The other is built for creating.
We tested both tools for three weeks to find out which one deserves your money.
Aperçu
We spent weeks testing NaturalReader vs Altered side by side.
We tested voice quality, features, pricing, and ease of use.
We paid for premium plans on both tools with our own money.
No brand sponsored this comparison.
Every score below comes from real hands-on testing.
Qu'est-ce qui est modifié ?
Altered is an AI voice content creation platform built for media production.
It lets you change your voice into any character using speech-to-speech technology.
You record your voice. Altered morphs it into someone else entirely.
The emotion and timing stay. Only the voice changes.
Game developers, podcasters, and film producers use it every day.
Modifié
Altered Studio is a next-generation audio editor that combines voice cloning, voice morphing, and text-to-speech in one app. Built by a former Google speech scientist. Start free with no credit card required.
Altered Pricing
Here’s what Altered costs in 2026. Let’s break it down.
| Plan | Prix | Idéal pour |
|---|---|---|
| Gratuit | 0 $/mois | Testing basic voice morphing |
| Créateur | 30 $/mois | Solo creators and podcasters |
| Professionnel | 90 $/mois | Studios and production teams |
Essai gratuit : Yes. The free plan lets you test voice morphing and basic editing. No credit card required.
Garantie de remboursement : Professional and Enterprise users should check the pricing page for refund details.
📌 Note: All plans are billed annually. The prices shown are monthly costs when paying yearly. The Creator plan unlocks voice cloning, all speaking styles, and the full voice editor.
⚠️ Warning: The free plan is very limited. You can only test basic features. For voice cloning and all 14 speaking styles, you need the Creator plan at minimum.
Key Benefits of Altered
Here’s why Altered stands out from the competition:
- Transformation vocale : Change your voice into any character while keeping your emotion and timing. No other tool does speech-to-speech this well.
- Rapid Voice Cloning: Clone any voice from just a few seconds of audio. Create custom voice models for your projects fast.
- Real-Time Voice Changer: Use it on Discord, Zoom, or Skype with ultra-low latency. Your voice changes immédiatement during live calls.
- 14 Speaking Styles: Go from a whisper to a shout with emotive text-to-speech. Perfect for dialogue and character work.
- Nettoyeur vocal IA : Remove background noise, mouth clicks, and filler words automatically. Your recordings sound studio-quality.
- 75+ Language Support: Transcribe, translate, and add voiceovers in dozens of languages. Great for global content teams.
Altered Pros & Cons
✅ Pros
- Studio-grade voice morphing that keeps your performance intact
- Real-time voice changing for live calls and gaming
- Built by a former Google speech scientist with deep expertise
- All-in-one platform for cloning, morphing, TTS, and editing
❌ Cons
- Steep learning curve for beginners with many features to master
- Cannot read documents or ebooks like a TTS reader
- No mobile app or Chrome extension for on-the-go use
Qu'est-ce que NaturalReader ?
NaturalReader is a text-to-speech app that reads your documents out loud.
It turns PDFs, ebooks, emails, and web pages into spoken audio.
Students, professionals, and people with dyslexia use it daily.
It has over 1 million monthly users and 15+ years in the TTS space.
Think of it as a personal narrator for everything you need to read.
Lecteur naturel
NaturalReader converts any text, PDF, image, or webpage into natural-sounding audio. Over 1,000 AI voices in 100+ languages. Used by 2,000+ educational institutions worldwide.
NaturalReader Pricing
Here’s what NaturalReader costs in 2026. Let’s break it down.
| Plan | Prix | Idéal pour |
|---|---|---|
| Gratuit | 0 $/mois | Basic voices with daily limits |
| Plan individuel | 49 $/mois | Individual users needing full access |
| Plan d'équipe | 79 $/mois | Small teams and businesses |
Essai gratuit : Yes. The free version gives unlimited basic voices and 20 minutes per day of premium voices.
Garantie de remboursement : Yearly plans get 30 days. Monthly plans get 14 days. You must request the refund separately.
📌 Note: NaturalReader has separate personal and commercial plans. Personal version audio is for your ears only. You need the commercial plan to use audio publicly.
⚠️ Warning: All plans auto-renew at the end of each billing cycle. Canceling your plan does not trigger an automatic refund. You must request one separately.
Key Benefits of NaturalReader
Here’s why NaturalReader stands out from the competition:
- 20+ File Formats: Read PDFs, DOCX, EPUB, TXT, and even images. Few TTS tools support this many file types.
- 1,000+ AI Voices: Choose from over 1,000 voices in 100+ languages and dialects. One of the widest selections available.
- AI Text Filtering: Automatically removes URLs, footnotes, and distracting text while reading. The audio stays clean.
- Accès multiplateforme : Available as a web app, mobile app, Chrome extension, and desktop software. Listen anywhere.
- OCR Camera Scanner: Point your phone at a physical book page. NaturalReader reads it out loud in seconds.
- Adapté aux dyslexiques : Dyslexia fonts, adjustable speeds, and text highlighting help students with reading disabilities.
- MP3 Downloads: Convert any text into MP3 files for offline listening. Great for commutes and workouts.
NaturalReader Pros & Cons
✅ Pros
- Reads 20+ file types including PDF, EPUB, and images
- 1,000+ voices in 100+ languages for global coverage
- Free version with unlimited basic voice usage
- Chrome extension and mobile apps for listening anywhere
- 15+ years of experience in text-to-speech technology
❌ Cons
- $49/month is expensive for a personal reading tool
- No voice morphing, cloning, or real-time voice changing
- Free version limits premium voices to 20 minutes per day
- Customer support can be slow to respond
Comparaison des fonctionnalités
Ready to see how NaturalReader and Altered stack up feature by feature?
We tested 10 key areas to help you pick the right tool.
| Fonctionnalité | Modifié | Lecteur naturel |
|---|---|---|
| Prix initial | 30 $/mois | 49 $/mois |
| Plan gratuit | ✅ | ✅ |
| Clonage vocal | ✅ | ✅ (Basic) |
| Transformation vocale | ✅ | ❌ |
| Real-Time Voice Changer | ✅ | ❌ |
| Synthèse vocale | ✅ | ✅ |
| Document Reading (PDF, EPUB) | ❌ | ✅ |
| Application mobile | ❌ | ✅ |
| Extension Chrome | ❌ | ✅ |
| Idéal pour | Voice content creators | Personal reading & accessibility |
1. Qualité de la voix
Modifié : Altered produces studio-grade voice output. The speech-to-speech technology preserves your natural delivery. Voices sound human because they start from a human performance.
Lecteur naturel : NaturalReader offers over 1,000 AI voices that sound natural for reading. Premium and Plus voices are better than free ones. But they still sound like a computer reading to you.
2. Voice Cloning
Modifié : Altered clones voices from just a few seconds of audio. You can create custom voice models for any project. The cloned voices sound remarkably close to the original.
Lecteur naturel : NaturalReader has basic voice cloning in its commercial plans. But it is not the main focus of the tool. The cloning quality does not match dedicated platforms like Altered.
3. Morphing de la voix
Modifié : This is Altered’s signature feature. Record your voice and morph it into any character. Change accents, age, gender, and style while keeping your emotion and timing intact.
Lecteur naturel : NaturalReader does not have voice morphing at all. It reads text in preset voices. You cannot transform your own voice recordings with this tool.
⚠️ Warning: Voice morphing is what makes Altered unique. If you need to create different character voices from your own recordings, NaturalReader cannot do this.
4. Synthèse vocale
Modifié : Altered has premium text-to-speech with 14 speaking styles. You can make the AI whisper, shout, or speak with specific emotions. Great for dialogue and narration.
Lecteur naturel : NaturalReader is a dedicated TTS tool. It has 1,000+ voices in 100+ languages. You can adjust speed up to 900 words per minute. It reads documents, not just typed text.
5. Document & File Support
Modifié : Altered works with audio files only. You upload voice recordings to edit and transform. It does not read documents, PDFs, or ebooks.
Lecteur naturel : NaturalReader reads 20+ file types. Upload PDFs, DOCX, EPUB, TXT, and even images. It also reads emails, Google Docs, and web pages through its Chrome extension.
6. Real-Time Voice Changing
Modifié : Altered offers a real-time voice changer with ultra-low latency. Use it on Discord, Zoom, Skype, or any voice chat. Your voice transforms instantly during live conversations.
Lecteur naturel : NaturalReader has no real-time voice changing feature. It is a playback tool, not a live voice transformer. You can only listen to pre-converted audio.
7. Nettoyage vocal par IA
Modifié : Altered has a built-in AI voice cleaner. It removes background noise, filler words, and mouth artifacts. Your recordings sound professional without any manual editing.
Lecteur naturel : NaturalReader has AI text filtering instead. It removes URLs, footnotes, and citations from text before reading. But it does not clean audio recordings.
8. Platform Access
Modifié : Altered runs as a web app and a desktop app for Windows and Mac. It uses local informatique power for processing. There is no mobile app or browser extension.
Lecteur naturel : NaturalReader is available everywhere. Web app, iOS app, Androïde app, Chrome extension, and desktop software. You can sync listening across all appareils avec un seul compte.
9. Language Support
Modifié : Altered supports 75+ languages for transcription and translation. You can translate your voiceovers into dozens of languages automatically.
Lecteur naturel : NaturalReader offers 1,000+ voices in 100+ languages and dialects. This is one of the widest voice libraries in the entire TTS market.
10. Pricing & Cost
Let’s compare the pricing plans side by side.
| Plan | Modifié | Lecteur naturel |
|---|---|---|
| Gratuit | 0 $/mois | 0 $/mois |
| Mid Tier | $30/month (Creator) | $49/month (Single) |
| Top Tier | $90/month (Professional) | $79/month (Team) |
Modifié : The Creator plan at $30/month gives you voice cloning, morphing, TTS, and the full editor. That is $19 cheaper than NaturalReader’s paid plan. You get far more creative tools for less money.
Lecteur naturel : The Single plan at $49/month is expensive for a reading tool. But the Team plan at $79/month serves multiple users. The free version is generous with unlimited basic voices.
Different Scenarios
| If You Need… | Choose | Why |
|---|---|---|
| Voice morphing for characters | Modifié | Only tool with speech-to-speech |
| Reading PDFs and ebooks aloud | Lecteur naturel | Reads 20+ file formats |
| Modification de la voix en temps réel | Modifié | Ultra-low latency live morphing |
| Mobile listening on the go | Lecteur naturel | iOS and Android apps available |
| Lower monthly cost | Modifié | $30/mo vs $49/mo paid plans |
| Accessibility for dyslexia | Lecteur naturel | Dyslexia fonts and text highlights |
💰 Your Budget
Altered’s Creator plan costs $30/month. NaturalReader’s Single plan costs $49/month. If price matters, Altered gives you more features for less money.
🔌 Your Tech Stack
NaturalReader works on mobile, Chrome, web, and desktop. Altered runs on web and desktop only. If you need to listen on your phone, NaturalReader is the better fit.
📝 Your Content Goals
Need to create voice content for videos, jeux, or podcasts? Pick Altered. Need to listen to articles, books, and documents? Pick NaturalReader.
🎓 Your Experience Level
NaturalReader is simple enough for anyone. Upload a file and press play. Altered has a learning curve because it offers many advanced voice outils d'IA.
🆓 Free Trials and Demos
Both tools have free plans. NaturalReader gives 20 minutes per day of premium voices. Altered lets you test basic voice morphing. Try both before you commit.
🛟 Support Options
NaturalReader has a help center and email support but response times can be slow. Altered offers a help center, blog, and FAQ resources. Neither has live chat.
Switching Guide
Already using one of these tools? Here’s what to expect if you switch.
🔄 Switching from Altered to NaturalReader?
✅ What you’ll gain:
- Read 20+ document formats including PDF, EPUB, and images
- Mobile apps and Chrome extension for listening anywhere
- 1,000+ voices in 100+ languages with text highlighting
❌ What you’ll lose:
- Speech-to-speech voice morphing for character creation
- Real-time voice changing for live calls and gaming
- Advanced AI voice cleaning for audio recordings
📋 How to switch:
- Export any finished audio projects from Altered Studio
- Create a free NaturalReader account and upload your documents
- Install the Chrome extension and mobile app for full access
🔄 Switching from NaturalReader to Altered?
✅ What you’ll gain:
- Voice morphing to create unique characters from your own voice
- Real-time voice changing for Discord, Zoom, and live calls
- AI voice cleaning to remove noise and polish recordings
❌ What you’ll lose:
- Ability to read PDFs, ebooks, and 20+ document formats
- Mobile apps and Chrome extension for on-the-go listening
- OCR camera scanning for physical books and printed text
📋 How to switch:
- Download any saved MP3 files from NaturalReader
- Sign up for a free Altered account at altered.ai
- Upload your first voice recording and start morphing
Verdict final
| Catégorie | Gagnant |
|---|---|
| 💰 Pricing | Modifié |
| 🚀 Voice Quality | Modifié |
| ⚡ Voice Cloning | Modifié |
| 🎯 Voice Morphing | Modifié |
| 📄 Document Reading | Lecteur naturel |
| 📱 Platform Access | Lecteur naturel |
| 🔌 Ease of Use | Lecteur naturel |
| 🏆 Overall Winner | Modifié |
🏆 WINNER: Altered
Altered wins 4 out of 7 categories.
Best for: Voice content creators, game developers, podcasters, and media production teams.
Altered and NaturalReader serve completely different needs.
Altered is a voice creation powerhouse. It morphs, clones, and transforms voices for professional projects.
NaturalReader is a personal reading assistant. It reads your documents, books, and web pages out loud.
NaturalReader is excellent if you want hands-free reading across every device.
But if you need to create voice content, Altered is the stronger and more affordable choice.
Now, go out and create amazing voice content!
More of Altered Compared
Here’s how Altered stacks up against other competitors:
Altered vs Hume
Altered wins on: Voice morphing, real-time voice changing
Hume wins on: Emotion detection, empathic AI research
Altered vs Murf IA
Altered wins on: Voice morphing, voice cloning depth
Murf AI wins on: Ease of use, commercial voiceover library
Altered wins on: Voice creation tools, real-time morphing
Speechify wins on: Mobile experience, document reading
Altered vs Description
Altered wins on: Voice morphing, speaking styles
Descript wins on: Video editing, transcript-based editing
Altered vs ElevenLabs
Altered wins on: Speech-to-speech morphing, live voice changing
ElevenLabs wins on: Voice realism, API access for developers
Altered vs Play.ht
Altered wins on: Voice morphing, AI voice cleaning
Play.ht wins on: Blog-to-audio, podcast publishing
Altered wins on: Voice morphing, real-time voice changer
Lovo wins on: Video creation, stock media library
Altered vs Listnr
Altered wins on: Voice cloning quality, speaking styles
Listnr wins on: Podcast distribution, audio embedding
Altered vs Podcastle
Altered wins on: Voice morphing, character voice creation
Podcastle wins on: Podcast recording, remote interviews
Altered vs Doublage
Altered wins on: Voice morphing depth, audio editing
Dupdub wins on: Avatar creation, marketing videos
Altered vs Laboratoires WellSaid
Altered wins on: Voice morphing, real-time changing
WellSaid Labs wins on: Enterprise voice quality, brand voices
Altered vs Revoice
Altered wins on: Voice cloning, speaking styles variety
Revoicer wins on: One-time pricing, simple interface
Altered vs Haut-parleur de lecture
Altered wins on: Voice morphing, creative voice tools
ReadSpeaker wins on: Enterprise TTS, website accessibility
Altered vs Speechelo
Altered wins on: Voice morphing, voice cloning quality
Speechelo wins on: One-time payment, beginner simplicity
Altered vs TTSOpenAI
Altered wins on: Voice morphing, real-time voice changer
TTSOpenAI wins on: Developer API, cost per character
More of NaturalReader Compared
Here’s how NaturalReader stacks up against other competitors:
NaturalReader wins on: Document reading, file format support
Murf AI wins on: Commercial voiceover quality, studio tools
NaturalReader contre Speechify
NaturalReader wins on: File format variety, AI text filtering
Speechify wins on: Voice quality, mobile experience
NaturalReader wins on: Document reading, accessibility features
Descript wins on: Video editing, audio transcription
NaturalReader contre ElevenLabs
NaturalReader wins on: File format support, free voice library
ElevenLabs wins on: Voice realism, voice cloning quality
NaturalReader vs Play.ht
NaturalReader wins on: Document reading, OCR scanning
Play.ht wins on: Blog audio embedding, podcast tools
NaturalReader wins on: File format support, Chrome extension
Lovo wins on: Video creation, AI art generation
NaturalReader wins on: Document formats, accessibility tools
Listnr wins on: Podcast hosting, audio distribution
NaturalReader contre Podcastle
NaturalReader wins on: Document reading, language variety
Podcastle wins on: Podcast recording, remote interviews
NaturalReader wins on: File support, reading accessibility
Dupdub wins on: Avatar videos, marketing content
NaturalReader contre WellSaid Labs
NaturalReader wins on: Personal reading, free plan generosity
WellSaid Labs wins on: Enterprise voice quality, brand voices
NaturalReader wins on: Document reading, cross-platform access
Revoicer wins on: One-time pricing, simple voiceover creation
NaturalReader wins on: Personal use pricing, mobile apps
ReadSpeaker wins on: Enterprise TTS, website accessibility
NaturalReader wins on: Voice library size, document support
Speechelo wins on: One-time payment model, beginner ease
NaturalReader wins on: File format support, no coding needed
TTSOpenAI wins on: Developer API, per-character pricing
NaturalReader wins on: Personal reading, accessibility tools
Hume wins on: Emotion AI research, empathic voice tech
Foire aux questions
Is Altered AI free?
Yes. Altered has a free plan that gives basic access to voice morphing and editing. But it is very limited. For voice cloning and all speaking styles, you need the Creator plan at $30/month.
Can I use NaturalReader for free?
Yes. NaturalReader’s free version gives unlimited use of basic voices. You also get 20 minutes per day of premium voices and 5 minutes per day of plus voices.
What is the most realistic AI voice changer?
Altered Studio is one of the most realistic AI voice changers available. Its speech-to-speech technology preserves your natural delivery while changing the voice completely.
Is NaturalReader better than Speechify?
NaturalReader supports more file formats than Speechify. But Speechify has better voice quality and a stronger mobile experience. It depends on what matters most to you.
Is AI voice cloning illegal?
Voice cloning technology itself is not illegal. However, using it to impersonate someone without their consent can be. Always get permission before cloning another person’s voice.
English 
Spanish 
Chinese 
German 
French 
Arabic 
Russian 
Portuguese 
Japanese 
Korean 
Italian 
Turkish 
Dutch 
Polish 
Indonesian 
Thai 
Vietnamese 