# CastReader vs Immersive Translate

CastReader records 55,999 monthly visits with +9.8% month-over-month growth and Freemium pricing. Immersive Translate records 2,392,414 monthly visits with -9.4% growth and Freemium, Free Trial pricing.

| Metric | [CastReader](https://openaitools.app/tool/castreader) | [Immersive Translate](https://openaitools.app/tool/immersive-translate) |
| :--- | :--- | :--- |
| Website URL | https://castreader.com | https://immersivetranslate.com |
| Categories | AI Text-to-Speech, AI Speech Synthesis, AI Reader | AI Translate, AI PDF, AI Video Translator, AI Subtitle Generator |
| Pricing Model | Freemium | Freemium, Free Trial |
| Monthly Visits | 55,999 | 2,392,414 |
| MoM Growth Rate | +9.8% | -9.4% |
| Primary Market | United States | China |
| Direct Visits | 19,699 | 1,795,939 |
| Review Score | 4.4 | 4.6 |
| Saved Count | 0 | 10 |
| 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)

## Immersive Translate

Immersive Translate is an AI translation tool designed around reading and watching, not just pasting text. Its best-known feature is bilingual website translation: it shows the original and the translation side by side in a vertical layout, which makes it easier to compare meaning and learn a language as you read. It runs as a browser extension on Chrome, Edge, Firefox and Safari, and also as mobile apps for iOS and Android.

Beyond web pages, the tool covers documents, video and images. It translates PDF, ePub, HTML, TXT, DOCX, Markdown and subtitle files while preserving the original layout, and can OCR scanned PDFs so they become searchable and translatable. For video, it generates real-time bilingual subtitles on more than 100 platforms, including YouTube, Netflix and Prime Video, and can even translate videos that have no original subtitles. It also handles image and comic translation and adds live translation to online meetings on Zoom, Google Meet and Microsoft Teams.

Under the hood, Immersive Translate integrates more than 20 translation engines, among them ChatGPT (OpenAI), DeepL, DeepSeek and Gemini, and supports over 100 language pairs. Context-aware AI terminology libraries and customizable glossaries help keep names, technical terms and jargon consistent, which matters for academic papers, contracts and technical documentation. According to the project, the extension is used by more than 30 million people.

**Pricing & Plans:** Immersive Translate is freemium: the core bilingual translation features are free, and you can also use your own API keys for third-party engines. A Pro subscription unlocks higher limits and advanced features such as full PDF and ePub translation, with free trials available.

- **Bilingual website translation:** Displays the original text alongside the translation in a side-by-side layout, so you can read in two languages without losing the source.
- **Layout-preserving document translation:** Translates PDF, ePub, DOCX, Markdown and other files while keeping the original formatting, with OCR for scanned documents.
- **Video subtitle translation:** Generates real-time bilingual subtitles on 100+ video platforms and can translate videos that have no original subtitles.
- **Image, comic and meeting translation:** Translates images and comics with OCR and inpainting, and adds live translation to Zoom, Google Meet and Microsoft Teams.
- **20+ engines and 100+ languages:** Choose from engines like ChatGPT, DeepL, DeepSeek and Gemini, covering more than 100 language pairs using AI terminology libraries.

**Strengths:** Side-by-side bilingual display is excellent for reading and language learning; Covers web pages, PDFs, ebooks, videos, images and meetings in one tool; Integrates 20+ engines so you can choose the best one per task; Preserves original document layouts and supports OCR for scanned files

**Limitations:** Best results on some features require a paid Pro plan; Free usage with hosted engines is subject to rate limits; Bringing your own API key means managing separate engine costs

[Profile (Markdown)](https://openaitools.app/tool/immersive-translate.md)

## Frequently Asked Questions

### How do CastReader and Immersive Translate compare in monthly traffic?

CastReader has 55,999 monthly visits, while Immersive Translate has 2,392,414. 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%; Immersive Translate has -9.4%.

### 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. Immersive Translate: Freemium, Free Trial. Immersive Translate is freemium: the core bilingual translation features are free, and you can also use your own API keys for third-party engines. A Pro subscription unlocks higher limits and advanced features such as full PDF and ePub translation, with free trials available.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [DeepL](https://openaitools.app/tool/deepl) | 95,110,871 | -1.7% | Freemium | Offers exceptionally accurate professional text and document translation, though lacks native side-by-side browser page rendering. | [.md](https://openaitools.app/tool/deepl.md) |
| 2 | [Speechify](https://openaitools.app/tool/speechify) | 5,457,475 | +0.5% | Freemium | Text to speech and voice AI across every device | [.md](https://openaitools.app/tool/speechify.md) |
| 3 | [Sider](https://openaitools.app/tool/sider) | 2,644,740 | -10.6% | Freemium | Integrates translation and AI chat in a browser sidebar, but offers less specialized layout-preserved document translation. | [.md](https://openaitools.app/tool/sider.md) |
| 4 | [OpenL Translate](https://openaitools.app/tool/openl) | 1,470,643 | +8.8% | Freemium, Subscription | Supports multilingual text, document, and image translation across over one hundred languages with web utilities. | [.md](https://openaitools.app/tool/openl.md) |
| 5 | [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) |
| 6 | [Maestra AI](https://openaitools.app/tool/maestra-ai) | 1,340,377 | +0.7% | Free Trial, Subscription, Pay As You Go, Custom Enterprise | Excels at video subtitle generation and dubbing, but lacks general web page bilingual translation features. | [.md](https://openaitools.app/tool/maestra-ai.md) |
| 7 | [Trancy](https://openaitools.app/tool/trancy) | 438,752 | -57.6% | Freemium, Free Trial | Browser extension offering bilingual subtitles and side-by-side translations, though with more focus on language learning tools. | [.md](https://openaitools.app/tool/trancy.md) |
| 8 | [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) |
| 9 | [BelinDoc](https://openaitools.app/tool/belindoc) | 262,525 | -1.4% | Freemium, Contact for Pricing | Free online document translator preserving original formatting, though lacking real-time bilingual web page rendering. | [.md](https://openaitools.app/tool/belindoc.md) |
| 10 | [Transmonkey](https://openaitools.app/tool/transmonkey) | 242,338 | +10.6% | Paid | Translates documents, images, and videos across multiple LLM backends, but functions primarily as a web app. | [.md](https://openaitools.app/tool/transmonkey.md) |

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Source: https://openaitools.app/compare/castreader-vs-immersive-translate

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