⚡ Quick Verdict:
- 価格: TTSOpenAI uses pay-as-you-go at $0.00004/credit vs Altered at $30/month (Creator plan)
- 最適な用途: TTSOpenAI for テキスト読み上げ and voiceovers, Altered for voice morphing and media production
- 主な違い： TTSOpenAI focuses on converting 文章 into natural sounding speech. Altered focuses on changing your voice into other 声.
- Our pick: TTSOpenAI for most users — better voice quality, lower cost, and an easier start
Altered and TTSOpenAI both work with advanced voice ai technology.
しかし、それらは全く異なる問題を解決する。
TTSOpenAI turns written text into natural sounding speech.
Altered changes your real voice recordings into a professional voice.
One is a text to speech tool. The other is a next generation audio editor.
想像する choosing between smooth voiceovers and energetic voice performances.
This comparison helps you pick the right one.
概要
This Altered vs TTSOpenAI comparison covers pricing, key features, and ease of use.
We also break down who each tool works best for.
Our sources include published specs, documentation, and user reviews.
At this moment, both tools are releasing updates regularly.
By the end, you’ll know which ai voice tool fits your needs.
TTSOpenAIとは何ですか?
TTSOpenAI is a text to speech platform powered by OpenAI’s voice engine.
It converts text into natural sounding speech in seconds.
The platform offers multiple voice options like Alloy, Nova, and Shimmer.
You can pick a young male tone or a gentle female voice for your project.
Developers can use its REST API to add voice agents to any app.
It works well for voiceovers, e learning, and marketing service needs.
TTSOpenAI
Convert text into high quality narration with OpenAI voices. Free tier available. No monthly fees required.
TTSOpenAIの価格
TTSOpenAI uses a simple pay-as-you-go model. There are no monthly plans.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 使った分だけ支払う | 1クレジットあたり0.00004ドル | すべてのユーザー — 必要なものだけを購入してください |
Pricing verified April 2026.
無料トライアル: Yes — 2,000 free characters. No credit card needed.
返金保証: ウェブサイトには正式な返金ポリシーは記載されていません。
📌 注記： Credits are based on characters. One character equals one credit. You buy credit packs starting at $8 for 200,000 credits. Credits expire after 60 days.
⚠️ 警告： Some features like SSML tags and voice cloning need paid credits. The free tier has limited customization. Test the free tier first to check voice quality before buying credits.
TTSOpenAIの主な利点
Here’s what makes TTSOpenAI worth considering:
- 自然な音声品質： The text to speech model produces speech with proper intonation and emphasis. It sounds like a real person, not a robot.
- 従量課金制： No monthly fees or subscriptions. You only pay for the characters you convert. Great for creators with irregular needs.
- 複数の言語: Generate speech in multiple languages including English, Spanish, French, and Japanese. It also handles different accents.
- 開発者API: The REST API lets developers integrate text to speech into any app or website. Documentation is clean and easy to follow.
- カスタムボイスメーカー： Create a custom voice from just 60 seconds of audio. Good for brand voice or personal projects.
- 高速生成: Real-time streaming means you hear audio almost 即座に. No long wait times for processing.
- ストーリー作成ツール： Build narrated stories with emotion tags and tone control. Add instructions for pauses, pronunciation, and speed. Helpful for audio storytelling and e learning content.
What Our Team Noticed
私たちの 作家 signed up for TTSOpenAI and spent several days testing the platform. Here’s what stood out:
TTSOpenAIの長所と短所
✅ メリット
- Natural sounding speech with proper intonation
- 月額料金なしの従量課金制
- Free tier with 2,000 characters to test
- Clean API for developer integration
- Supports multiple languages and accents
❌ デメリット
- Only 6 built-in voice options
- オーディオエディターやタイムラインは内蔵されていません
- Basic emotion control compared to competitors
- クレジットは60日後に失効します。
Altered とは何ですか?
Alteredは、メディア制作向けに構築されたAI音声コンテンツ作成プラットフォームです。
It integrates multiple voice ai technologies into one app.
The platform includes voice morphing, voice cloning, and an AI voice cleaner.
Altered Studio also works as a real time voice changer for live calls.
Voice creators in game development, podcasts, and film use it daily.
Instead of replacing human talent, Altered augments their work.
改変
Transform your voice recordings with speech-to-speech morphing. Built by a former Google speech scientist. Free plan to get started.
価格変更
Altered uses monthly subscription plans. Here’s the breakdown.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 無料 | 月額0ドル | 基本的な音声編集機能のテスト |
| クリエイター | 月額30ドル | Voice cloning and full speaking styles |
| プロ | 月額90ドル | Studios needing priority support |
Pricing verified April 2026.
無料トライアル: Yes — free plan with basic voice editing. No credit card needed. Users can also sign up for a free trial of the Creator plan.
返金保証: Contact the pricing page for Professional or Enterprise subscription details.
📌 注記： All plans are billed annually. The prices shown are monthly costs when paying yearly. The free plan gives basic access to voice editing but is very limited.
⚠️ 警告： Altered Studio has a steep learning curve. It’s not the easiest tool for beginners. Budget extra time to learn the interface before starting a paid plan.
変更された主な利点
Here’s what makes Altered worth considering:
- 音声モーフィング: Change your recorded voice into any other voice. The advanced voice technology keeps your original timing and emotion while swapping the vocal identity.
- Rapid ボイスクローン: Clone a voice from just a few seconds of audio. This lets you create custom voices for characters and projects fast.
- 14種類の話し方： The emotive text to speech offers styles like whispering, shouting, and calm delivery. Great for voice performances with range.
- リアルタイム音声変換機能： Change your voice during live calls or gaming. It provides realistic alterations with background noise cancellation.
- AI音声クリーナー: Remove background noise and mouth artifacts from voice recordings. Makes raw audio sound professional.
- 多言語サポート: Transcribe and translate audio in 75+ languages. You can dub content into other languages using text to speech.
- Desktop + Browser: Runs online or locally on Windows and マック. Local processing uses your own コンピューティング resources for privacy.
What Our Team Noticed
Our writer signed up for Altered Studio and spent several days exploring the platform. Here’s what stood out:
変更された長所と短所
✅ メリット
- Speech-to-speech voice morphing preserves emotion
- ライブ通話やゲーム用のリアルタイムボイスチェンジャー
- 内蔵のAI音声クリーナーが背景ノイズを除去します
- 14 speaking styles for expressive voice performances
- Runs locally on desktop for added privacy
❌ デメリット
- 新規ユーザーにとって学習曲線が急峻
- Creator plan starts at $30/month which is pricey
- 無料プランは機能が非常に限られています
- Requires good source audio for best results
機能比較
Let’s compare Altered vs TTSOpenAI across 8 key features. This breakdown covers everything from voice quality to pricing.
| 特徴 | TTSOpenAI | 改変 |
|---|---|---|
| 開始価格 | 1クレジットあたり0.00004ドル | 月額0ドル（無料） |
| 無料プラン | ✅ | ✅ |
| テキスト読み上げ | ✅ | ✅ |
| 音声モーフィング | ❌ | ✅ |
| 音声クローン | ✅ | ✅ |
| リアルタイムボイスチェンジャー | ❌ | ✅ |
| APIアクセス | ✅ | ❌ |
| オーディオエディター | ❌ | ✅ |
| 最適な用途 | Text to speech and voiceovers | Voice morphing and media production |
1. 音声クローン
TTSOpenAI: The Custom Voice Maker creates a voice from just 60 seconds of clean audio. Neural voice cloning allows the creation of unique voices from short audio samples. It works well for basic voice cloning needs like brand voices or personal projects.
変更: The voice cloning technology in Altered Studio clones a voice from just a few seconds of recordings. The rapid voice clone feature generates usable voice models quickly. You can create the voice of a specific actor, friend, or even yourself at a younger age.
2. テキスト読み上げ
TTSOpenAI: This is the core feature. The text to speech model converts just text into natural sounding speech with proper pronunciation. You get OpenAI voices like Alloy, Nova, and Shimmer from a portfolio tts voices collection. The TTS-1 model handles real-time use. The TTS-1-HD model handles high quality narration for professional grade projects. OpenAI keeps releasing new audio models and integrated measures for better output.
変更: Altered Studio includes premium text to speech with an extensive voice library. It supports 70+ languages via multiple voice AI providers. The speaking style feature offers 14 styles including whispering, shouting, and calm tones. This makes it an online audio editor for professional voice projects. However, text to speech is just one part of the larger Altered Studio platform.
3. 音声モーフィング
TTSOpenAI: TTSOpenAI does not offer voice morphing. It focuses only on converting text into speech. If you need to change your recorded voice, you’ll need a different tool.
変更: This is Altered’s flagship feature. The speech-to-speech voice morphing changes your voice into any other voice. It preserves your timing, emotion, and delivery while swapping the vocal identity. You can drive a whole multi-character production by yourself using voice puppeteering.
⚠️ 警告： Voice morphing requires clean source audio for best results. Record in a quiet room with a decent microphone. Poor input audio leads to poor output audio.
4. リアルタイム音声変換機能
TTSOpenAI: TTSOpenAI supports real-time streaming of audio for playback. But it does not work as a real time voice changer during calls or gaming. Its real-time feature is for text to speech output, not voice transformation.
変更: The real time voice changer works during voice chats and video calls. It provides ultra-low latency morphing for live calls or gaming. You can change your accent, age, and gender while keeping the tempo of your speech. It also includes effective noise cancellation during live sessions.
5. Voice Editor and Audio Tools
TTSOpenAI: There is no built-in audio editor. You generate audio, download it as MP3, and edit it elsewhere. TTSOpenAI is focused on the generation step only. For editing, you need a separate tool like Audacity or 説明.
変更: Altered Studio is a full online audio editor. It includes lanes, region-level effects, and the AI voice cleaner. The history editing feature lets you track and revert to previous versions of your audio project. It exports to WAV at up to 48 kHz for broadcast-quality output.
6. API and Developer Integration
TTSOpenAI: The developer-friendly API lets you integrate text to speech into any application. Developers can customize speech parameters like speed and tone. The API supports real-time streaming to keep playback delays low. It works well for building voice agents, チャットボット, and e learning platforms.
変更: Altered Studio does not offer a public REST API for developers. The platform is designed as a desktop and browser application. You interact with it through the user friendly interface, not through code. This limits its use for developers who want to build custom integrations.
7. 言語とアクセントのサポート
TTSOpenAI: The platform supports multiple languages and accents. OpenAI TTS models are optimized for English but work with many other languages. You can generate speech in Spanish, French, Japanese, and more.
変更: Altered supports transcription and translation in 75+ languages. You can also change your accent on voice calls without changing your voice. The platform lets you dub content into other languages using its text to speech engine. This makes it strong for global content creation.
8. 価格とコスト
| プラン | TTSOpenAI | 改変 |
|---|---|---|
| 無料 | 2,000文字まで無料 | $0/month (limited features) |
| 有料入場 | 20万クレジットで8ドル | 月額30ドル（クリエイター向け） |
| プロ／プロフェッショナル | 使った分だけ支払う | 月額90ドル（プロフェッショナルプラン） |
| 企業 | Volume discounts | カスタム価格設定 |
TTSOpenAI: The pay-as-you-go model means you never pay for what you don’t use. At $0.00004 per credit, even large projects stay affordable. There are no monthly commitments. TTSOpenAI has different pricing plans that scale with usage.
変更: The $30/month Creator plan unlocks voice cloning, morphing, and all speaking styles. It’s a good deal for professionals who use it daily. But for occasional users, that monthly fee adds up fast. The Professional plan at $90/month makes sense for studios with heavy workloads.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| 予算が限られている | TTSOpenAI | 使った分だけ支払う |
| 音声モーフィング | 改変 | Speech-to-speech is unique |
| Text to speech only | TTSOpenAI | Built for that exact purpose |
| ライブ音声変換 | 改変 | リアルタイム音声変換 |
| API統合 | TTSOpenAI | Clean REST API available |
| オーディオ編集 | 改変 | Full editor built in |
| 初心者向け | TTSOpenAI | 学習しやすいシンプルなインターフェース |
💰 あなたの予算
TTSOpenAI wins here. You pay $0.00004 per character with no monthly fees. Altered costs $30/month minimum for useful features. If you only need occasional voiceovers, TTSOpenAI saves you money.
🔌 あなたの技術スタック
Developers should pick TTSOpenAI for its API. You can integrate it into any app or website. Altered has no public API, so it stays inside its own interface.
🎤 Your Use Case
Need to convert text into speech? TTSOpenAI is the right tool. Need to change your own voice recordings into other voices? Altered handles that. These tools solve different problems.
🎓 あなたの経験レベル
TTSOpenAI has an easy to use interface. You paste text, pick a voice, and generate audio. Altered Studio has a steeper learning curve with many features to master.
🆓 無料トライアルとデモ
Both offer free tiers. TTSOpenAI gives you 2,000 free characters. Altered offers a free plan with limited voice editing. Try both before committing any money.
🛟 サポートオプション
Altered provides priority support on the Professional plan. TTSOpenAI relies on documentation and community forums. If you need hands-on support, Altered’s paid plans offer more help.
切り替えガイド
既にこれらのツールのいずれかをご利用ですか？切り替える場合、どのような変更が予想されますか？
🔄 TTSOpenAIからAlteredに切り替えますか？
✅ 得られるもの：
- Voice morphing to change your voice into other voices
- Built-in audio editor with lanes and effects
- ライブ通話やゲーム用のリアルタイムボイスチェンジャー
❌ 失うもの：
- 従量課金制の柔軟性
- Developer API for custom app integration
- Simple text-in, audio-out workflow
📋切り替え方法：
- Download any generated audio from TTSOpenAI as MP3 files
- Create a free account on Altered Studio’s website
- Import your audio files and start using voice morphing or text to speech
🔄 AlteredからTTSOpenAIに切り替えますか？
✅ 得られるもの：
- Lower cost with pay-as-you-go pricing
- Clean REST API for developer integration
- Simpler workflow for text to speech tasks
❌ 失うもの：
- 音声間モーフィング
- Built-in audio editor and AI voice cleaner
- Real-time voice changer for calls
📋切り替え方法：
- Altered Studio から完成したオーディオプロジェクトをエクスポートします。
- TTSOpenAIで無料アカウントを作成
- Paste your text and generate audio with your chosen voice
What Our Review Didn’t Cover
This comparison focused on individual creators and small teams. We didn’t test enterprise-level features or custom voice licensing at scale. Our observations are based on the April 2026 versions of both tools. If you’re running a large studio with 50+ voice projects, your experience may differ from what we’ve described here.
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | TTSOpenAI |
| 🎤 Text to Speech Quality | TTSOpenAI |
| 🔄 音声モーフィング | 改変 |
| 🎙️ 音声クローン | ネクタイ |
| 👶 使いやすさ | TTSOpenAI |
| 🔌 APIと統合 | TTSOpenAI |
| 🎛️ 音声編集 | 改変 |
| 🏆総合優勝 | TTSOpenAI |
🏆 受賞者：TTSOpenAI
TTSOpenAIは7部門中4部門で優勝した。
最適な用途: text to speech, voiceovers, e learning content, developer integration
TTSOpenAI and Altered serve different purposes. TTSOpenAI is a text to speech tool that converts written words into natural voices. Altered is a voice content creation platform that transforms your own voice recordings into audio content for any project.
Altered is excellent for voice morphing and live voice changing. If you need to drive multiple characters with your own performance, Altered is the better choice.
However, most users just need to convert text into high quality voice content. For that, TTSOpenAI delivers better results at a lower price.
TTSOpenAIの比較
TTSOpenAIが他の競合他社と比べてどのような位置づけにあるのか、以下に示します。
TTSOpenAIが勝利した点： lower pricing with pay-as-you-go, free tier for testing, simpler interface for quick generation
イレブンラボ 勝利したタイトル： voice library with 1,200+ voices, advanced emotion and tone control, stronger voice cloning quality
TTSOpenAI vs マーフ
TTSOpenAIが勝利した点： no monthly subscription required, developer API access, OpenAI-powered voice quality
マーフの勝利条件： 内蔵 ビデオエディター for syncing audio, wider voice selection, team collaboration features
TTSOpenAI vs Play.ht
TTSOpenAIが勝利した点： faster audio generation speed, lower entry cost, cleaner API documentation
Play.htが勝利した点： podcast hosting integration, larger voice marketplace, SSML editor with more control
TTSOpenAIが勝利した点： pay-as-you-go flexibility, API for custom apps, natural sounding speech quality
Speechifyが勝利した点： browser extension for reading web pages, mobile app experience, Chrome integration for accessibility
変化したものを比較すると、
Alteredが他の競合他社と比べてどうなのか、以下に示します。
Alteredが勝利した試合： speech-to-speech voice morphing, real-time voice changer for calls, built-in audio editor with effects
ElevenLabsが勝利した点： text to speech voice variety with 1,200+ options, lower starting price, easier setup for beginners
Alteredが勝利した試合： voice morphing preserves original performance emotion, 14 speaking styles for expressive range, live voice changing during calls
説明文が勝つ点： full video and podcast editing suite, filler word removal, screen recording built in
オルタード vs マーフ 人工知能
Alteredが勝利した試合： voice morphing for character work, desktop app for local processing, AI voice cleaner for background noise
Murf AIが勝利した点： video sync with voiceover timeline, simpler text to speech workflow, team collaboration tools
Alteredが勝利した試合： real-time voice changing, speech-to-speech technology, 75+ language transcription and translation
Lovoが勝利した点： AIビデオ generation with voice, simpler pricing structure, faster onboarding for new users
よくある質問
Altered AIは無料ですか？
Yes, Altered offers a free plan. It gives basic access to the voice editor. But voice cloning and all speaking styles need the Creator plan at $30/month.
TTSOpenAIは無料で利用できますか？
Yes. The free tier gives you 2,000 characters of audio. After that, you buy credits with the pay-as-you-go model. There is no monthly fee.
最もリアルなAI音声合成技術とは？
ElevenLabs is widely considered the most realistic in 2026. TTSOpenAI comes close with its OpenAI-powered natural voices. Both sound very natural for the price.
は AI音声クローン 違法？
Using voice cloning itself is not illegal. However, using it to impersonate someone without consent can be. High-risk AI applications in the EU must meet transparency rules. Always get permission before cloning someone’s voice.
音声模倣に最適なAIは何ですか？
Altered is strong for voice mimicking thanks to its speech-to-speech morphing. ElevenLabs also excels at voice cloning. For basic custom voices from short audio, TTSOpenAI’s Custom Voice Maker works well.
English 
Spanish 
Chinese 
German 
French 
Arabic 
Russian 
Portuguese 
Japanese 
Korean 
Italian 
Turkish 
Dutch 
Polish 
Indonesian 
Thai 
Vietnamese 