# OpenAI.fm

OpenAITools.app のテレメトリ（2026-11-11 検証）によると、OpenAI.fm（openai.fm）は AI テキスト読み上げに分類される AI プラットフォームで、月間 35.9万の訪問を生み出し、前月比のトラフィック増減は +11.64万（+48%）です。主要な地域市場はインド（トラフィックシェア 41.5%）で、無料の料金モデルで運営されています。月間ボリューム別の主な競合代替ツールには ElevenLabs（月間 4239.68万訪問）、Fish Audio（月間 855.72万訪問）、F5 TTS（月間 5789 訪問）が含まれます。

OpenAI.fm is a browser-based playground that showcases the speech generation models behind OpenAI's text-to-speech API. Type or paste text, optionally steer the delivery with an inline instruction, and hear the result spoken aloud by a selectable voice. It is a quick way to compare voices and styles before you commit to an API integration.

## 主なテレメトリと仕様

| 指標 | 値 |
| :--- | :--- |
| ツール名 | OpenAI.fm |
| ハンドル | openai-fm |
| Status | active |
| Origin | official |
| Maintenance | active |
| 公式ドメイン | openai.fm |
| ウェブサイト URL | https://www.openai.fm |
| カテゴリ | AI テキスト読み上げ, AI API, AI 音声生成ツール, AI開発者ツール |
| 料金モデル | 無料 |
| 月間訪問数 | 358,988 |
| 前月比トラフィック変動 | 116,404 |
| 前月比成長率 | +48% |
| 主要市場 | インド |
| 市場シェア | 41.5% |
| ダイレクト訪問 | 210,718 |
| オーガニック検索訪問 | — |
| ソーシャル訪問 | — |
| リファラル訪問 | 8,847 |
| メール訪問 | 1,189 |
| レビュースコア | 4.6 |
| 保存数 | 1 |
| 対応プラットフォーム | ウェブサイト |
| 請求プラットフォーム |  |
| 属性 | 機能: ウェブサイト; 料金: 無料 |
| タグ | テキスト読み上げ, OpenAI API, 音声生成, インタラクティブデモ, 音声合成 |

## 概要

OpenAI.fm is a browser-based playground that showcases the speech generation models behind OpenAI's text-to-speech API. Type or paste text, optionally steer the delivery with an inline instruction, and hear the result spoken aloud by a selectable voice. It is a quick way to compare voices and styles before you commit to an API integration.

## 料金とプラン

Free to use in the browser with no account required. Costs only apply if you separately call OpenAI's text-to-speech API and pay its per-character audio pricing.

## 主な機能と特長

- **Multiple voice presets:** Pick from a roster of built-in voices ranging from bright and conversational to calm and narration-friendly, then hear the same line delivered differently.
- **Style instructions from plain text:** Add a short natural-language direction such as "speak slowly and warmly" to influence tone, pace, and emotion without changing the script itself.
- **Instant browser playback:** Paste a paragraph or a full script and stream the synthesized audio immediately, with no signup, install, or configuration step.
- **Side-by-side auditioning:** Switch voices, styles, and wording back-to-back to judge which combination fits a voiceover, audiobook, or product demo.
- **Direct line to the API:** The demo mirrors the same speech generation models exposed through OpenAI's TTS endpoints, so what you hear is a good preview of what an integration will produce.
- **Soundwave player:** A soundwave visualization animates while audio plays, and there is a compact embedded player for listening without leaving the page.

## 主なユースケース

- **Cast the right voice for a script (Voiceover creators):** Paste lines of dialogue with short style cues and audition several voices to find the right narrator for a script, audiobook sample, or podcast intro.
- **Practice pronunciation with a reference read (Language learners):** Generate an English reference read of a line to hear natural pacing and intonation before you invest time in recording or hiring talent.
- **Prototype before integrating the API (Developers):** Test a style prompt and a voice choice in the browser first, then replicate the same settings in code when calling OpenAI's TTS endpoint.
- **Rapid copy sanity check (Product marketers):** Turn a product announcement or feature blurb into a spoken preview in seconds, so stakeholders can hear the copy rather than read it.

## 強み

- Completely free and usable without creating an account
- Style prompts let you shape delivery with ordinary language instead of technical parameters
- Instant side-by-side comparison across voices speeds up casting decisions
- Mirrors the production models behind OpenAI's speech API, so previews are representative
- No installation, plugins, or local GPU required

## 制約・デメリット

- The demo is a showcase rather than a full studio — there is no project management, batch export, or voice library management
- Long-form narration with fine-grained pacing and emphasis control is limited compared with dedicated TTS suites
- Output is tied to OpenAI's hosted models, so there is no offline or self-hosted option
- Fatigue from the looping soundwave UI affects some visitors, and access can be interrupted by bot-protection checkpoints

## よくある質問

### Do I need an OpenAI account or API key to use OpenAI.fm?
No. OpenAI.fm is a free, publicly accessible demo from OpenAI that lets visitors preview speech generation in the browser. You need your own API credentials and billing only if you want to call the TTS endpoint from an application.

### Can the voices speak languages other than English?
Most gpt-4o-mini-tts voices are English-first, though several are described as multilingual and can speak other languages with varying accents. Quality in non-English languages depends on the specific voice you pick.

### What audio formats does the underlying model support?
The API supports audio output formats such as MP3, Opus, AAC, and FLAC. The demo itself plays audio in the browser, so for a downloadable file in a specific format you should use the API.

### Is OpenAI.fm an official OpenAI support channel?
No. It is an independent demonstration page for OpenAI's speech technology. It is not an official OpenAI support channel and it does not give access to ChatGPT or any other OpenAI product beyond speech synthesis previews.

### OpenAI.fm の月間トラフィックと成長トレンドはどうですか？
OpenAI.fm は現在、月間 35.9万の訪問があり、前月比のトラフィック変動は +11.64万（成長率 +48%）です。主要な流入市場はインド（シェア 41.5%）で、月間 21.07万のダイレクト訪問と月間 — のオーガニック検索訪問を含みます。

### OpenAI.fm は無料ですか？料金モデルは何ですか？
OpenAI.fm は無料の料金モデルで運営されています。Free to use in the browser with no account required. Costs only apply if you separately call OpenAI's text-to-speech API and pay its per-character audio pricing. 対応する請求・チェックアウトプラットフォームには未掲載が含まれます。

### 2026年における OpenAI.fm の最適な代替ツールはどれですか？
OpenAITools.app のカテゴリ別トラフィックと機能の適合性に基づくと、OpenAI.fm の代替ツールトップ5は次のとおりです: 1. ElevenLabs（月間 4239.68万訪問）; 2. Fish Audio（月間 855.72万訪問）; 3. F5 TTS（月間 5789 訪問）; 4. Speechify（月間 545.75万訪問）; 5. TTSMaker（月間 115.88万訪問）。

### OpenAI.fm はどのプラットフォームと主要な AI 機能に対応していますか？
OpenAI.fm は AI テキスト読み上げ, AI API, AI 音声生成ツール, AI開発者ツールに分類され、以下のプラットフォームに対応しています: ウェブサイト。中核機能のタグにはテキスト読み上げ, OpenAI API, 音声生成, インタラクティブデモ, 音声合成が含まれます。

## 代替ツール

| ツール名 | 月間訪問数 | 料金モデル | 比較 |
| :--- | :--- | :--- | :--- |
| [ElevenLabs](https://openaitools.app/ja/tool/elevenlabs-io) | 42,396,771 | フリーミアム、有料、料金は要問い合わせ | [比較](https://openaitools.app/ja/compare/elevenlabs-io-vs-openai-fm) |
| [Fish Audio](https://openaitools.app/ja/tool/fish-speech) | 8,557,159 | フリーミアム | [比較](https://openaitools.app/ja/compare/fish-speech-vs-openai-fm) |
| [F5 TTS](https://openaitools.app/ja/tool/f5-tts-1) | 5,789 | 無料 | [比較](https://openaitools.app/ja/compare/f5-tts-1-vs-openai-fm) |
| [Speechify](https://openaitools.app/ja/tool/speechify) | 5,457,475 | フリーミアム | [比較](https://openaitools.app/ja/compare/openai-fm-vs-speechify) |
| [TTSMaker](https://openaitools.app/ja/tool/ttsmaker) | 1,158,846 | フリーミアム | [比較](https://openaitools.app/ja/compare/openai-fm-vs-ttsmaker) |
| [ttsMP3.com](https://openaitools.app/ja/tool/ttsmp3-com) | 378,881 | フリーミアム | [比較](https://openaitools.app/ja/compare/openai-fm-vs-ttsmp3-com) |
| [Listnr AI](https://openaitools.app/ja/tool/listnr-ai) | 235,777 | フリーミアム | [比較](https://openaitools.app/ja/compare/listnr-ai-vs-openai-fm) |
| [Miso One](https://openaitools.app/ja/tool/miso-one) | 13,802 | フリーミアム | [比較](https://openaitools.app/ja/compare/miso-one-vs-openai-fm) |
| [SpeechGen.io](https://openaitools.app/ja/tool/speechgen-io) | 767,550 | フリーミアム、有料 | [比較](https://openaitools.app/ja/compare/openai-fm-vs-speechgen-io) |
| [Crikk](https://openaitools.app/ja/tool/crikk) | 212,116 | フリーミアム、無料トライアル、有料 | [比較](https://openaitools.app/ja/compare/crikk-vs-openai-fm) |
| [Luvvoice](https://openaitools.app/ja/tool/luvvoice-free-text-to-speech) | 1,438,923 | フリーミアム | [比較](https://openaitools.app/ja/compare/luvvoice-free-text-to-speech-vs-openai-fm) |
| [Vbee AI Voice](https://openaitools.app/ja/tool/vbee-ai-voice) | 563,444 | 無料トライアル、料金は要問い合わせ | [比較](https://openaitools.app/ja/compare/openai-fm-vs-vbee-ai-voice) |

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出典: https://openaitools.app/ja/tool/openai-fm