# CastReader vs OpenAI.fm

CastReader records 55,999 monthly visits with +9.8% month-over-month growth and Freemium pricing. OpenAI.fm records 358,988 monthly visits with +48% growth and Free pricing.

| Metric | [CastReader](https://openaitools.app/tool/castreader) | [OpenAI.fm](https://openaitools.app/tool/openai-fm) |
| :--- | :--- | :--- |
| Website URL | https://castreader.com | https://www.openai.fm |
| Categories | AI Text-to-Speech, AI Speech Synthesis, AI Reader | AI Text-to-Speech, AI API, AI Voice Generator, AI Developer Tools |
| Pricing Model | Freemium | Free |
| Monthly Visits | 55,999 | 358,988 |
| MoM Growth Rate | +9.8% | +48% |
| Primary Market | United States | India |
| Direct Visits | 19,699 | 210,718 |
| Review Score | 4.4 | 4.6 |
| Saved Count | 0 | 1 |
| Supported Platforms | Website | Website |

## CastReader

CastReader is built for people who want to consume long-form text with their ears as well as their eyes. Once installed as a Chrome or Edge extension, or opened as an iPhone, iPad or Android app, it reads supported pages and documents aloud using natural AI voices while a word-synced highlight and auto-scroll keep your place. A public Voice Hub lets you preview real voice samples by language before committing, and playback speed ranges from standard rates up to 3x on the paid plan.

What separates it from a plain screen reader is a feature called Read & Explain. Instead of only pronouncing a dense or foreign-language paragraph, CastReader works out what it means and walks you through it in the language you know best, while an animated pen circles and underlines the relevant lines in the original text. That mix of eyes-on-page and ears-on-explanation is aimed at research papers, technical documentation, foreign-language news and other long reads where passive narration is not enough.

Sources are organised into four families: book platforms such as Kindle, WeRead, Google Play Books, Libby, Kobo and O'Reilly; articles and subscriptions including Medium, Substack, The Atlantic, The New Yorker and major newspapers; work documents and email such as Google Docs, Notion, Gmail and Google Drive; and AI conversations from ChatGPT, Claude, Gemini, DeepSeek and Kimi. CastReader also offers private voice cloning for your own documents and a developer Voice API for embedding cloned speech into applications. Free use needs no account, and payments are handled by Stripe.

**Pricing & Plans:** Freemium. Free plan: $0 forever with 20 minutes of listening per day, standard voices up to 1.25x speed, 3 AI explains per day, and 30,000 translation characters per day when signed in. Pro: $4.99/month or $35.99/year (about $3/month, 40% saving) removing the daily listening cap, unlocking full ebooks and long PDFs, more premium voices up to 3x speed, unlimited daily explains, 120 personal-voice minutes per membership month, and 3,000,000 translation characters per month. A 3-day free trial is available; billing is via Stripe.

- **Synced read-aloud:** Natural AI voices narrate webpages, PDFs, ebooks and documents while each spoken word is highlighted and the page auto-scrolls, so you never lose your place.
- **Read & Explain:** Instead of only reading a hard passage, CastReader summarises and unpacks its meaning in the language you know best, with an animated pen marking the key lines in the original text.
- **Wide source coverage:** Works across Kindle, WeRead, Google Play Books, O'Reilly and other book platforms, news and newsletter sites, Google Docs, Notion, Gmail, plus ChatGPT, Claude, Gemini, DeepSeek and Kimi answers.
- **Voice Hub and voice cloning:** Preview real samples of dozens of voices across many languages, and create private cloned voices that Pro members can apply to their own PDF, EPUB, Word and TXT files.
- **Developer Voice API:** A REST API for text-to-speech and private voice cloning in 10 languages, returning MP3 or WAV, priced at $8 per 1M characters for successful generations.

**Strengths:** Combines plain read-aloud with guided explanations that point back at the source text; Covers an unusually broad set of sources, from Kindle and Gmail to ChatGPT and Claude answers; Free tier is genuinely usable with no account required, and the 3-day Pro trial needs no commitment; Personal voice cloning and a pay-per-success Voice API extend it beyond a simple reader

**Limitations:** The 20-minute daily listening cap on the free plan runs out quickly for long books or PDFs; Source support and iOS previews vary by platform, browser version and content access rules; Applying a cloned voice to your own text is limited to 120 minutes per membership month even on Pro

[Profile (Markdown)](https://openaitools.app/tool/castreader.md)

## OpenAI.fm

The page is deliberately minimal: a text box, a voice picker, and a freeform instruction field where you can describe how the line should be read. That instruction field is the interesting part. Instead of forcing you to hunt for sliders, the model interprets plain-English direction — softer, faster, more excited, like a documentary narrator — and applies it to the performance. The result plays immediately through a small audio widget with an animated waveform.

Because the demo runs on the same hosted models that power OpenAI's speech API, it doubles as a fast auditioning room. Writers can hear how a line lands before recording it themselves; product teams can A/B a voiceover for a video; developers can pick a default voice and a style prompt before wiring anything into code. The whole loop takes seconds, and nothing is stored beyond the audio you generate.

It is best understood as a marketing-grade playground rather than a production tool. There is no project workspace, no batch rendering, and no downloadable library of previous generations. Some visitors also find the looping waveform animation distracting. Still, as a zero-friction way to hear OpenAI's speech models in action, it remains one of the simplest demos on the web.

**Pricing & Plans:** 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.

- **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.

**Strengths:** 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

**Limitations:** 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

[Profile (Markdown)](https://openaitools.app/tool/openai-fm.md)

## Frequently Asked Questions

### How do CastReader and OpenAI.fm compare in monthly traffic?

CastReader has 55,999 monthly visits, while OpenAI.fm has 358,988. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

CastReader has a month-over-month growth rate of +9.8%; OpenAI.fm has +48%.

### How does pricing compare?

CastReader: Freemium. Freemium. Free plan: $0 forever with 20 minutes of listening per day, standard voices up to 1.25x speed, 3 AI explains per day, and 30,000 translation characters per day when signed in. Pro: $4.99/month or $35.99/year (about $3/month, 40% saving) removing the daily listening cap, unlocking full ebooks and long PDFs, more premium voices up to 3x speed, unlimited daily explains, 120 personal-voice minutes per membership month, and 3,000,000 translation characters per month. A 3-day free trial is available; billing is via Stripe. OpenAI.fm: Free. 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.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ElevenLabs](https://openaitools.app/tool/elevenlabs-io) | 42,396,771 | +26.1% | Freemium, Paid, Contact for Pricing | Offers vastly superior voice cloning and emotional range, but lacks the specific OpenAI voice preview playground layout. | [.md](https://openaitools.app/tool/elevenlabs-io.md) |
| 2 | [Fish Audio](https://openaitools.app/tool/fish-speech) | 8,557,159 | +1.6% | Freemium | Provides open-source studio-grade text-to-speech with instant voice cloning, but requires self-hosting or community web interfaces. | [.md](https://openaitools.app/tool/fish-speech.md) |
| 3 | [Speechify](https://openaitools.app/tool/speechify) | 5,457,475 | +0.5% | Freemium | Focuses heavily on reading digital documents aloud and assistive listening, rather than raw speech generation testing. | [.md](https://openaitools.app/tool/speechify.md) |
| 4 | [Luvvoice](https://openaitools.app/tool/luvvoice-free-text-to-speech) | 1,438,923 | -8.2% | Freemium | Free AI text to speech with 200+ voices in 70+ languages | [.md](https://openaitools.app/tool/luvvoice-free-text-to-speech.md) |
| 5 | [TTSMaker](https://openaitools.app/tool/ttsmaker) | 1,158,846 | +6.8% | Freemium | A straightforward free online text-to-speech converter, but offers less granular voice style and parameter tweaking. | [.md](https://openaitools.app/tool/ttsmaker.md) |
| 6 | [SpeechGen.io](https://openaitools.app/tool/speechgen-io) | 767,550 | +2.3% | Freemium, Paid | AI text to speech with 5,000+ realistic voices in 150 languages | [.md](https://openaitools.app/tool/speechgen-io.md) |
| 7 | [Vbee AI Voice](https://openaitools.app/tool/vbee-ai-voice) | 563,444 | +12.1% | Free Trial, Contact for Pricing | Vietnamese AI text-to-speech, voice cloning, and dubbing for creators | [.md](https://openaitools.app/tool/vbee-ai-voice.md) |
| 8 | [ttsMP3.com](https://openaitools.app/tool/ttsmp3-com) | 378,881 | +8.1% | Freemium | Converts pasted text into downloadable MP3s quickly, though lacking advanced AI voice design and emotion controls. | [.md](https://openaitools.app/tool/ttsmp3-com.md) |
| 9 | [Peech: Text to Speech Reader](https://openaitools.app/tool/peech-text-to-speech-reader) | 353,093 | -26% | Freemium | Listen to anything. Beautifully. | [.md](https://openaitools.app/tool/peech-text-to-speech-reader.md) |
| 10 | [Listnr AI](https://openaitools.app/tool/listnr-ai) | 235,777 | -4.2% | Freemium | Includes robust voice cloning and podcast hosting tools, but is less focused on simple interactive voice testing. | [.md](https://openaitools.app/tool/listnr-ai.md) |

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Source: https://openaitools.app/compare/castreader-vs-openai-fm

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