# Nautilus - Web Browser & Notes — PDF Editor & Word Documents

> AI web browser, PDF editor, word processor, and EPUB reader in one application. (iPhone/iPad app by Kairoos Solutions SL.)

- Source: https://appshunter.io/ios/app/nautilus-web-browser-and-notes/id401450036 (this page in markdown: same URL + `.md`)
- Developer: [Kairoos Solutions SL](https://appshunter.io/developer/978066434)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 2.00/5 from 4 App Store ratings · 75 written reviews indexed
- Age rating: 17+
- Requires: iOS 26.0 · 488 MB
- Languages: Australian English, Afrikaans, Albanian, Amharic, Arabic, Armenian, Azerbaijani, Basque, Bangla, Bulgarian and 68 more
- Released: 2010-11-13
- Data updated: 2026-09-19
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/nautilus-web-browser-and-notes/id401450036/reviews.md

## What is Nautilus?

An AI web browser, PDF note-taking app, word processor, and EPUB reader in one. Research a topic, mark up what matters, and turn your ideas into a finished document—with AI help along the way.

BROWSE WITH AI AT YOUR SIDE

Explore the web with multiple tabs and keep your favorite websites close with bookmarks. Translate content, summarize articles, and ask AI questions about the page you’re reading. Select a passage for focused help—all without leaving your browser.

MAGIC LASSO: SELECT IT. ASK AI.

Draw around the content you want to explore, then ask AI about your selection. Get an explanation, a summary, or help understanding the details—with your selection as the context.

MAKE YOUR PDFs YOUR OWN

Highlight key passages, underline important details, and add annotations and sticky notes. Create PDF notes or scan paper documents to bring them into your work. Ask AI to help you understand and summarize what you’re reading.

TURN IDEAS INTO WORD DOCUMENTS

Go from a quick thought to a polished draft. Create and edit DOCX documents, format your text, and add images and tables. Use AI to rewrite passages, improve grammar, and make your message clearer.

READ EPUB BOOKS

Open and read EPUB ebooks without leaving Nautilus. Keep your books alongside your web browsing, PDF notes, and Word documents. Enjoy support for CBZ comics, too.

KEEP YOUR DOCUMENTS IN SYNC

Save your documents in iCloud Drive and keep them up to date across your devices. Pick up your writing and notes wherever you left off.

SHARE WHAT YOU CREATE

Share your writing as a Word document or export it to PDF. Bring your reading, notes, and ideas together into something ready to send.

WORK WITH YOUR FILES

• Documents: PDF, DOCX, RTF, RTFD, TXT, TEXT, Markdown (MD, MARKDOWN), and LaTeX (TEX, LATEX).
• Books and comics: EPUB and CBZ.
• Images: PNG, JPG, JPEG, HEIC, HEIF, and GIF.
• Audio and video: M4A, MP4, M4V, and MOV.
• Text, data, and source files: HTML, HTM, CSS, CSV, TSV, JSON, JSONL, XML, YAML, YML, SQL, LOG, PLIST, Swift, C, CPLUS, CPP, H, HPP, M, MM, JS, TS, SVG, IPYNB, Fountain, RST, ICS, VCF, M3U, SRT, and VTT.
• Additional formats: ZIP archives

Editing, reading, and preview capabilities vary by format. Source and data files open as text.

Whether you’re studying, researching, or writing, Nautilus brings the tools you need into one app—from your first question to your final draft.

Privacy Policy
https://www.noteswriter.com/Kairoos_Privacy_Policy.html

Terms of Use
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- AI-powered web browsing with summarization and translation
- PDF annotation, highlighting, and sticky notes
- DOCX word processing with AI grammar and rewrite assistance
- EPUB and CBZ comic reader
- Magic Lasso for AI analysis of selected content
- iCloud Drive synchronization across devices

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| Yearly Premium | $29.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Lifetime | $19.99 | one-time |


## Recent user reviews (10 of 75)

All indexed reviews: https://appshunter.io/ios/app/nautilus-web-browser-and-notes/id401450036/reviews.md

### 1/5 — Crash Crash Crash Crash

*2013-04-24*

Always crashing. So disappointing. It's beautiful yet useless app. I have had it for a year and kept hoping for fixes every time it's updated, but that is not the case. And so that it's clear, no other app crashes as often as this one. I give up, i am going to delete this now. Do not spend money on this app. You will be frustrated!

### 1/5 — Knowtilus Pro

*2013-04-15*

When I first got it was great, but I was doing some work on and now I can't get into it. All the work that I did I can get into it to print the work I did do. Im so frustrate and upset about it. These things were for my kids. It kicks my out every time. Please fix this problem.

### 1/5 — Flashy, but not useful for me

*2013-03-26*

I bought this app for the soul purpose of having an extended keyboard(as adverised) available for online blogging and text editing. It doesn't have the extended keyboard and when I contacted Knowtilus, they just told me to download another of their apps for text editing. But it's counter productive, because I specifically wanted the extended keyboard for online use. I'm not a fan of wasting my money when the company doesn't include features as advertised, then makes no effort to help me with it.

### 2/5 — UPDATE Bitte für IOS 6.1

*2013-02-10*

Die App läuft nicht flüssig, hängt sich ständig auf bzw. stürzt ständig ab. Google Suche-Leiste funktioniert nicht richtig, die links sind manchmal nicht anklickbar!! Deshalb würde ein Update nötig um die App wieder nutzen zu können

### 1/5 — Reality doesn't match the hype!

*2012-11-11*

Concepts are good but ... the implementation is poor. Even basic feature like multi-screen does not work properly. It creates notes but you only see the creation date (unlike what is shown on the promotional video)! There's no help and no support.
I've wasted money but I don't want to waste time wresting with this. I've deleted it.

### 4/5 — damn....

*2012-11-06*

I need the word-translate(other languages of define option) but not web-translate.
It is not useful to me,..
Please make the word search function.

### 1/5 — Maybe wait for the next release

*2012-11-04*

Extremely slow and unresponsive on my iPhone 5 running iOS 6.01--I am genuinely unsure how much of the problem is semi-frozen slowness and how much seems to be that it ignores touches.  I will, e.g., stroke 10 times on its upper introductory window, and maybe one of those will have an effect.

I tried uninstalling and reinstalling the app and rebooting the phone (I really wanted to use its text-to-speech feature), but neither helped.  I was able to get it to load a web page or two, and even read a little, but it was an incredsible amount of work and waiting for anything to happen, and the text reading only read a sentence or two before stopping.

Perhaps there are some iOS 6.01 or iPhone 5 issues yet to be resolved?

### 5/5 — Great App, Great Support

*2012-09-30*

My favorite combination browser and writing app!  Great for note taking on web content because tabs make shifting between notes and websites really easy and flexible.  I also love the way you can program it to read text aloud in different voices, laugh, pause, etc., and I have recommended Knowtilus to students who have some vision impairment.  The interface is distinctive, not only effective but attractive and eye-catching; it's one of those apps that makes people ask what it is and where to find it.  Tech support responds promptly to email and creates updates quickly but effectively.  I have several apps by this developer and like them all.

### 1/5 — when you keep upgrading crap...

*2012-09-30*

...its still crap

### 5/5 — Aidan U.K. reviews Knowtilus

*2012-09-25*

Love this App. In love with American women's voice. Mmm
Write on other app, copy and paste. As it speaks I can edit, revise.
Copy/paste to other app, copy/paste back to Knowtilus. Voila! Instant proof reading! Amazing, Brilliant, Thank you.*****

## Frequently asked questions about Nautilus

### Does Nautilus have ads?

Nautilus does not contain advertisements, offering an uninterrupted user experience.

### What is the rating for Nautilus?

Nautilus has a rating of 2.0 stars based on 4 user ratings.

### What devices support Nautilus?

Nautilus is available for iPhone and iPad devices.

### What file formats does Nautilus support?

Nautilus supports a wide range of formats including PDF, DOCX, EPUB, CBZ, and various text and image files.

### How often is Nautilus updated?

The latest version, 5.0, was released on September 18, 2026, indicating recent development activity.

### Is Nautilus suitable for younger users?

Nautilus has an age rating of 17+, suggesting it is intended for mature audiences.

### How does the AI feature in Nautilus work?

The AI can summarize articles, translate content, answer questions about web pages, and assist with writing and grammar in documents.

### Can I sync my work with Nautilus?

Yes, Nautilus allows you to save documents in iCloud Drive, keeping them synchronized across all your devices.

## Version history (last 5 releases)

### 5.0 — 2026-09-18

- New app icon, new design and new UI!
- Huge new update! New multitabbed UI and powerful AI Assistant!

### 3.5 — 2013-02-25

- Minor bug fixes
- Improved stability and perfomance

### 3.3 — 2012-11-28

- Fixed the text to speech limit problem for Knowtilus PRO paid version previous 3.2 update. Thanks for your support!

- Fixed iOS 6 problems with landscape rotation in iPad

### 3.2 — 2012-11-18

- Fixed bugs with iOS 6 and iPhone 5

### 3.1 — 2012-10-31

- Fixed minor bugs

## More apps by Kairoos Solutions SL

- [PDF PRO Files - Quick & Easy](https://appshunter.io/ios/app/pdf-pro-files-quick-and-easy/id980990291)
- [Scanner Prime! - PDF Scan, OCR](https://appshunter.io/ios/app/scanner-prime-pdf-scan-ocr/id980990576)
- [Word Processor - Textilus Pro](https://appshunter.io/ios/app/word-processor-textilus-pro/id1018671847)
- [Scrivener Companion - Scrivo 3](https://appshunter.io/ios/app/scrivener-companion-scrivo-3/id1068691473)
- [TextEdit - Text Editor](https://appshunter.io/ios/app/textedit-text-editor/id1070883678)

All apps by Kairoos Solutions SL: https://appshunter.io/developer/978066434

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-19.*