⚡ Quick Verdict:
- 価格: TTSOpenAI uses pay-as-you-go credits at $0.00004 each. Speechify charges $11.58/month annual or $29/month.
- 最適な用途: TTSOpenAI for creators making voiceovers. Speechify for readers consuming articles, PDFs, and books.
- 主な違い： TTSOpenAI generates downloadable audio files. Speechify reads existing text aloud on your device.
- Our pick: TTSOpenAI for voice creation work. Speechify for daily reading and accessibility.
Speechify vs TTSOpenAI both turn text into speech.
But they solve completely different problems for different users.
Speechify is a popular app for listening to articles, PDFs, and books.
TTSOpenAI is a voice ジェネレータ that creates downloadable audio files.
One helps you consume content. The other helps you create it.
This guide breaks down which tool fits your day to day life.
概要
This comparison covers pricing, voice quality, and ease of use.
We also break down the key features each platform offers.
Our sources include published specs, documentation, and user reviews.
Both tools use AI technology, but in very different ways.
By the end, you’ll know which one fits your work or life.
TTSOpenAIとは何ですか?
TTSOpenAI is a text to speech platform built on OpenAI’s voice models.
It converts written text into natural sounding speech you can download.
The platform offers a free tier and pay as you go pricing for heavy users.
It supports multiple languages, accents, and voice styles for any project.
Creators use TTSOpenAI for voiceovers, e learning content, and audio narration.
Developers can also integrate the service into apps using API keys.
TTSOpenAI
Generate professional grade voiceovers using OpenAI’s latest voice models. Perfect for creators, marketers, and developers who need high quality narration.
TTSOpenAIの価格
2026年のTTSOpenAIの費用は以下のとおりです。価格モデルはシンプルです。
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 無料枠 | $0 | Testing voices and short clips |
| 使った分だけ支払う | 1クレジットあたり0.00004ドル | Creators with variable workloads |
Pricing verified May 2026.
無料トライアル: Yes. You can try TTSOpenAI free with limited credits before paying.
返金保証: Pay as you go means you only pay for the credits you use. No long lock in periods.
📌 注記： Credits are consumed by character count when you generate audio. Longer scripts cost more, but the per credit rate is very low.
⚠️ 警告： Pricing varies based on which OpenAI model you choose. Higher quality voices may consume more credits per character.
TTSOpenAIの主な利点
Here’s what makes TTSOpenAI worth considering:
- OpenAI音声モデル： The platform uses OpenAI’s TTS technology. That means natural voices with proper pronunciation, emotion, and tone control.
- カスタムボイスメーカー： You can create custom voices for your brand or character. This helps you keep a consistent voice across videos.
- API Keys for Developers: Build TTSOpenAI into your own apps using API access. Perfect for voice agents, チャットボット, and integration projects.
- ストーリー作成ツール： Turn long scripts into smooth audio with the story maker. Great for ポッドキャスト creators and audiobook narration.
- リアルタイム合成： Generate speech in seconds using real time processing. There is no waiting around for long renders.
- MP3ダウンロード： Save every audio file as an MP3 for your ビデオエディター or upload it to your channel. The platform offers easy export options.
What Our Team Noticed
私たちの 作家 signed up for TTSOpenAI and spent time generating sample voiceovers across different voice options. Here’s what stood out:
TTSOpenAIの長所と短所
✅ メリット
- Pay as you go pricing keeps costs low for casual users
- API keys allow developers to build voice agents and tools
- Custom voice maker creates branded narration easily
- Voices sound expressive and energetic compared to older TTS tools
❌ デメリット
- Not built for reading PDFs or articles aloud on your phone
- Credit calculations can feel confusing at first
- Free tier is limited to short test clips
Speechifyとは何ですか?
Speechify is a popular app that converts written text into spoken words.
It reads articles, PDFs, emails, and books aloud using natural sounding voices.
The Speechify app works on iOS, Android, and as a Chrome extension.
It uses optical character recognition to scan printed text from images.
Speechify users include people with reading disabilities, students, and busy readers.
The Speechify library lets you save articles and PDF files for later listening.
Speechify is a valuable tool that helps you enhance productivity and shapes your reading experience.
スピーチファイ
The #1 audio reader in the world. Listen to PDFs, articles, and books at speeds up to 900 words per minute. Install Speechify today.
Speechifyの価格
Here’s what Speechify costs in 2026. Let’s break down the plans.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 限定（無料） | 月額0ドル | Trying basic non hd voices |
| Annual (Premium) | 月額11.58ドル | Daily readers wanting hd voices |
| 毎月 | 月額29ドル | Short-term Speechify Premium use |
Pricing verified May 2026.
無料トライアル: Yes. Speechify offers a 3 day trial of premium features before billing starts.
返金保証: Speechify does not advertise a public refund window, but you can cancel during the free trial.
📌 注記： The premium plan allows up to 150,000 words per month using premium voices. The basic version uses non hd voices only.
⚠️ 警告： Speechify pricing varies from country to country. The annual plan saves the most money, but it requires a full year up front.
Speechifyの主なメリット
Here’s what makes Speechify a versatile tool for daily readers:
- Reads Anything: Speechify reads PDF documents, articles, emails, and physical books. Simply upload a file or scan a page with your phone. The app’s ability to handle any digital content makes it a versatile app for busy users.
- 900 Words Per Minute: Adjust the reading speed up to 900 words per minute. The average reading speed is around 250 words per minute, so this saves time.
- テキストの強調表示: Real-time text highlighting syncs with the audio. This boosts comprehension for auditory learners and visual readers.
- OCRリーダー： The optical character recognition tech converts printed text from any image. You can scan a textbook page and listen to it instantly.
- クロスプラットフォームアプリ： Use Speechify on iOS, the Android app, web, or as a chrome extension. Your library syncs across all デバイス.
- 60以上の言語に対応： The Speechify text to speech engine supports many different languages. This makes it useful for language learners studying abroad content.
What Our Team Noticed
Our writer used Speechify on iOS and the chrome extension for several days of reading. Here’s what stood out from that hands on time:
Speechifyの長所と短所
✅ メリット
- User friendly interface that works on phone, web, and browser
- OCR scans printed text from photos and physical books
- Listen at speeds up to 900 words per minute to save time
- Free version is solid for testing the basic features first
❌ デメリット
- Speechify cost is higher than some alternatives like MicMonster
- You cannot download generated audio files for outside use
- The free Speechify limited plan caps your daily word count
機能比較
Now let’s go feature by feature in this Speechify review and TTSOpenAI comparison.
We’ll explore the key features that matter for both creators and daily readers.
Both tools also include advanced features that help users save time on routine work.
| 特徴 | スピーチファイ | TTSOpenAI |
|---|---|---|
| 開始価格 | 0ドル（無料） | 0ドル（無料） |
| 無料プラン | ✅ | ✅ |
| Reads PDF Files | ✅ | ❌ |
| カスタムボイス | ❌ | ✅ |
| APIアクセス | ✅（プレミアム） | ✅ |
| OCR Reader | ✅ | ❌ |
| Download Audio File | ❌ | ✅ (MP3) |
| Chrome拡張機能 | ✅ | ❌ |
| 音声オプション | 1,000+ AI voices | OpenAI premium voices |
| 最適な用途 | Reading content | ナレーションの作成 |
1. Voice Quality and Natural Voices
スピーチファイ： Speechify offers over 1,000 ai voices in different languages. The premium voices sound like human like voices with smooth tone, allowing users to read for hours without ear fatigue. The basic version uses non hd voices that sound flatter than the paid hd voices, especially with background noise from a phone speaker. Many Speechify users praise the high quality voices for daily reading. Academic research suggests that hearing and reading at the same time improves comprehension.
TTSOpenAI: TTSOpenAI uses OpenAI voices like Alloy, Onyx, and Nova for natural sounding speech. The output handles emotion, pronunciation, and pauses well. Voices respond to your tone instructions, so you can request a calm, gentle, or young male delivery. For example, you can ask for an excited tone for a product demo or a calm tone for a meditation track. According to user reviews, TTSOpenAI delivers more professional grade voiceovers compared to many competitors. The easy to use interface makes the experience smooth even for first-time creators.
2. Custom Voices and Voice Cloning
スピーチファイ： Speechify includes voice cloning on its premium subscription plans. You can imagine your own voice reading any text aloud. The feature is useful for content creators who want a personal touch. However, voice cloning is locked behind the higher tier of Speechify Premium.
TTSOpenAI: TTSOpenAI has a custom voice maker built into the platform. You can create unique characters or branded voices for your videos. The custom voice options are part of the standard pay as you go pricing. This makes it easier to test and create without higher fees.
3. Reading Existing Content
スピーチファイ： This is where Speechify stands out. Speechify reads PDF files, web pages, emails, and physical books. The chrome extension lets you click any article and listen instantly. The Speechify app on Android and iOS also works on uploaded PDF documents.
TTSOpenAI: TTSOpenAI is not built for reading existing content. It is built for converting text into downloadable audio. You paste just text into the editor and generate an audio file. There is no PDF reader, no web extension, and no library for saved articles.
⚠️ 警告： If you want to listen to articles or PDFs on the go, TTSOpenAI is not the right tool. It is a 音声ジェネレータ, not a reader app.
4. Optical Character Recognition (OCR)
スピーチファイ： Speechify reads printed text using OCR. Open the camera, point at a textbook page, and Speechify reads the words back to you. This makes physical books accessible without retyping anything. The Speechify text to speech engine handles handwritten and typed text.
TTSOpenAI: TTSOpenAI does not include OCR. You can only convert text that you paste or import as text. There is no scanning feature for printed pages or images. Users who need to read physical content should pick another tool.
5. API Access for Developers
スピーチファイ： Speechify offers API access for developers building accessibility tools. You can integrate the Speechify text to speech engine into your own apps. The API is mainly aimed at apps that want to read content aloud. It works well for e learning platforms and reading software.
TTSOpenAI: TTSOpenAI is built with developers in mind. The API keys feature lets you generate speech from your own apps with simple integration. Once integrated, your app can stream audio in real time. It is ideal for chatbots, voice agents, and IVR systems. Developers can log in, generate a key, and start testing in minutes.
6. Reading Speed and Listening Experience
スピーチファイ： Speechify lets you adjust playback up to 900 words per minute. That is far above the average reading speed of around 250 words per minute. The listening experience is built around long sessions. Users can also pause, rewind, and resume デバイス間で。
TTSOpenAI: TTSOpenAI generates an audio file rather than streaming a listening experience. You can adjust speed and ピッチ during the conversion step. After that, you play the audio file in any media player. This works well for finished voiceover production but not for live reading.
7. Multiple Languages and Accents
スピーチファイ： Speechify supports over 60 languages and many accents. Language learners can listen to articles in a different language to study pronunciation. The voice options include native speakers for major languages. This makes Speechify a strong tool for multilingual readers.
TTSOpenAI: TTSOpenAI also supports multiple languages and accents through OpenAI’s models. The model is tuned for English but handles many other tongues well. You can pick a voice and language from the dropdown before generating audio. The accents sound natural for major regions, and OpenAI keeps releasing new models that expand the range of supported voices.
8. Customizable Options and Tone Control
スピーチファイ： Speechify offers customizable options like speed, voice, and highlighting style. You can pick from over 1,000 voices in the premium plan. However, you cannot fine tune emotion or specific delivery. The customization is built around the listening experience.
TTSOpenAI: TTSOpenAI gives you deeper customization for tone and delivery. You can request a calm, expressive, or energetic read in your prompt. The platform also lets you control pronunciation and pauses. This is a powerful tool for podcast and video creators.
9. AI Dubbing and Translation Features
スピーチファイ： Speechify includes an AI dubbing feature for video creators. You can take an existing video and dub it into a different language. This adds value beyond the standard text editing and reading flow. It works best for short clips and social videos.
TTSOpenAI: TTSOpenAI does not include built in video dubbing. It focuses on raw audio file generation. You would need to combine TTSOpenAI with a video editor to dub a clip. The trade off is more control over each line of audio.
10. 価格設定とコスト
Let’s compare the pricing plans side by side. Both tools offer a free version to start.
| プラン | スピーチファイ | TTSOpenAI |
|---|---|---|
| 無料 | Limited (basic voices) | Free tier (test credits) |
| 年間 | 月額11.58ドル | 使った分だけ支払う |
| 毎月 | 月額29ドル | 1クレジットあたり0.00004ドル |
| Enterprise / API | Custom (Premium API) | 使った分だけ支払う |
スピーチファイ： Speechify uses a flat subscription model with monthly or annual billing. The annual plan saves money but locks you in for a year. There is no monthly subscription cheaper than $29. The premium subscription plans suit users who read every day.
TTSOpenAI: TTSOpenAI charges by usage with very low credit pricing. Casual users pay almost nothing for short scripts. Heavy users still keep costs reasonable thanks to the per credit model. There is no monthly subscription you have to think about. At the moment, TTSOpenAI offers different pricing plans to fit casual and heavy use cases.
さまざまなシナリオ
Here is how to match each tool to your situation.
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| Read PDFs aloud | スピーチファイ | コンテンツ消費向けに構築 |
| ナレーションを作成する | TTSOpenAI | ダウンロード可能な音声ファイル |
| Tight budget, casual use | TTSOpenAI | Pay only for what you generate |
| Daily reading, all formats | スピーチファイ | Reads PDFs, web, books, emails |
| Build voice agents | TTSOpenAI | API keys for developers |
| Listen on the go | スピーチファイ | iOS and Android apps with sync |
| Custom branded voices | TTSOpenAI | Custom voice maker built in |
💰 あなたの予算
If you want to save time and money on small projects, TTSOpenAI’s pay as you go model wins. Speechify’s $11.58 per month annual plan only makes sense if you read every day.
🔌 あなたの技術スタック
Developers who need integration into apps will pick TTSOpenAI for its API and OpenAI tts service. Speechify is more app-focused with its chrome extension and mobile apps.
📝 あなたのワークフロー
If you produce video content, podcasts, or e learning material, TTSOpenAI fits the workflow. If you import text from articles or PDFs to consume, Speechify enhances productivity better.
🎓 あなたの経験レベル
Speechify offers a more user friendly interface for non technical users. TTSOpenAI is friendlier for creators and developers who want control over the tts process and output.
🆓 無料トライアルとデモ
Both tools have a free version, so test before you buy. Speechify offers a 3 day premium trial. TTSOpenAI free tier lets you generate short clips without an account fee.
🛟 サポートオプション
Speechify has a large user community and detailed help center. TTSOpenAI offers documentation and integration guides aimed at developers. Both respond to support tickets through email.
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、どのような変更が想定されますか？
🔄 TTSOpenAIからSpeechifyに切り替えますか？
✅ 得られるもの：
- Read PDF documents and articles directly without converting them first
- OCR reader for scanning physical books and printed text
- Chrome拡張機能とモバイルアプリでどこでも音楽を聴くことができます
❌ 失うもの：
- Pay as you go pricing flexibility for occasional users
- The ability to download generated MP3 audio files
- Easy custom voice maker for branded voiceovers
📋切り替え方法：
- Cancel pay as you go credits in your TTSOpenAI account
- Sign up for Speechify and pick the annual or monthly plan
- Install the Speechify chrome extension and mobile app
🔄 SpeechifyからTTSOpenAIに切り替えますか？
✅ 得られるもの：
- Download MP3 audio files for use in videos and podcasts
- Pay only for the credits you use, no monthly subscription
- API keys for adding voice features to your own apps
❌ 失うもの：
- Real-time PDF, web, and email reading on your phone
- OCR scanning for printed text and physical books
- The Speechify library of saved articles and audiobooks
📋切り替え方法：
- Cancel your Speechify premium subscription before renewal
- Create a TTSOpenAI account and load some pay as you go credits
- Move your scripts into the editor and start testing voices
What Our Review Didn’t Cover
This comparison focused on individual creators and daily readers. We did not test enterprise SSO or bulk licensing for either product. Long-term audio quality drift across very large books was not measured. If you plan to generate hundreds of hours of audio per month, your usage may differ from what we observed in shorter projects.
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | TTSOpenAI |
| 🚀 音声品質 | TTSOpenAI |
| 📖 Reading Existing Content | スピーチファイ |
| 🎯 Custom Voices | TTSOpenAI |
| 👶 Ease of Use (Readers) | スピーチファイ |
| 🔌 開発者向けAPI | TTSOpenAI |
| 📱 Mobile and Browser Apps | スピーチファイ |
| 🏆総合優勝 | TTSOpenAI |
🏆 WINNER: TTSOPENAI
TTSOpenAIは7部門中4部門で優勝した。
最適な用途: Voiceover creators, developers, marketing teams, and podcast producers
Speechify and TTSOpenAI are two very different products. They both convert text into speech, but their goals are completely separate.
TTSOpenAI is a voice generator for creators who need to produce audio. It wins on voice quality, pricing flexibility, and developer features.
Speechify is a reader app for people who want to listen to articles and PDFs. It wins on the listening experience, reading speed control, and OCR.
If you mostly consume content, Speechify is the better fit for your day to day life. If you produce content, TTSOpenAI saves time and gives more control.
TTSOpenAIの比較
Here’s how TTSOpenAI stacks up against other voice generation platforms:
TTSOpenAI vs イレブンラボ
TTSOpenAIが勝利した点： Lower per credit pricing, simpler API setup, and direct OpenAI model access
ElevenLabsが勝利した点： More advanced voice cloning, larger voice library, and broader emotion controls
TTSOpenAI vs マーフAI
TTSOpenAIが勝利した点： Pay as you go pricing, OpenAI voice quality, and developer-friendly API keys
Murf AIが勝利した点： Built-in video sync features, more polished editor UI, and プレゼンテーション ツール
TTSOpenAI vs リスト番号
TTSOpenAIが勝利した点： Cleaner audio output, OpenAI tts model integration, and lower entry cost
Listnrが勝利した点： 600+ voices in 75+ languages, podcast hosting tools, and an easier beginner workflow
TTSOpenAI vs Play.ht
TTSOpenAIが勝利した点： Direct OpenAI model output, simpler pricing, and faster real-time synthesis
Play.htが勝利した点： Larger voice catalog, podcast publishing tools, and team collaboration features
Speechifyの比較
Here’s how Speechify stacks up against other reading and voice apps:
Speechify vs ナチュラルリーダー
Speechifyが勝利した点： Faster reading speeds up to 900 wpm, more voice options, and slicker mobile apps
NaturalReaderが優れている点： Stronger free tier limits, simpler pricing, and lower commitment for casual use
Speechify vs ElevenLabs
Speechifyが勝利した点： PDF and article reading, OCR for printed text, and a chrome extension built for content
ElevenLabsが勝利した点： More advanced voice cloning, downloadable studio quality audio, and creator tools
Speechify vs リードスピーカー
Speechifyが勝利した点： Consumer apps, faster setup, and a Speechify library that syncs across devices
ReadSpeakerが優れている点： Enterprise deployments, 学校 integrations, and custom branded reading widgets
Speechify vs スピーチロ
Speechifyが勝利した点： Mobile reading apps, OCR support, and a much wider list of premium voices
Speecheloが勝利した点： One time payment model, simpler video voiceover focus, and a cheaper lifetime cost
よくある質問
Speechifyは本当に無料ですか？
Yes, Speechify offers a free version with basic non hd voices and limited features. The free Speechify limited plan caps your daily word count, so heavy readers will need premium for full access.
Speechifyよりも優れたものは何ですか？
It depends on your goal. If you want to generate audio files, TTSOpenAI is better thanks to its custom voices and downloadable MP3s. If you want to listen to PDFs and articles, Speechify still leads the category.
Speechifyの料金はいくらですか？
The annual plan works out to $11.58 per month and includes hd voices and full features. The monthly subscription is $29 per month, which suits short-term needs but costs more long term.
TTSOpenAIは無料で利用できますか？
TTSOpenAI offers a free tier with limited credits so you can test the service. Beyond that, you pay as you go at $0.00004 per credit, which keeps costs low for casual users.
OpenAIのTTSはどの程度優れているのか？
OpenAI TTS produces natural sounding speech with strong tone control and pronunciation. The model handles emotion and pauses well, which is why TTSOpenAI feels more expressive than older tts services.
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