DEVONthink To Go 4 vs OpenVox Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DEVONthink To Go 4
Manage your entire knowledge library on your iPad and iPhone. Organize, edit, and annotate documents, notes, and more. Leverage generative AI for summaries, content creation, and advanced search. Syncs privately and securely across devices.
- Document organization and management
- AI-powered summaries and content creation
- PDF annotation and editing
- On-device OCR for searchable documents
- Cross-device secure synchronization
- Custom metadata and tagging
- Shortcuts automation
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Your entire knowledge library. Always with you. Always private. DEVONthink To Go is your document repository when you're not at your Mac. Collect, organize, edit, and annotate. Use generative AI to work with your stored knowledge or create new documents. Automate with Shortcuts. Our time-tested technology keeps all your data in sync between your Mac, iPad, and iPhone, privately and securely. The professional document and information manager for iPad and iPhone. From DEVONtechnologies, driving innovation since 2002. - Students: Annotate research papers with AI-powered summaries - Teachers: Organize your materials, use AI to create handouts and tests - Researchers: Have your data with you in a robust, powerful knowledge manager - Lawyers: Keep all case files organized and encrypted Have your important documents with you at all times: - Never lose an important document again, keep everything organized - Store PDFs, notes, images, bookmarks, just about any type - File your documents in groups, even more than one group at a time - Use tags, mark documents with flags or as unread, give them a star rating - Versioning lets you return to a previous state of a document - Revision-proof databases prevent edits to documents with special requirements - Sync your data between Macs, iPads, and iPhones, securely and privately Work with your documents: - Edit texts, Markdown files, or rich text documents - Annotate and edit PDFs with common tools - Make scans, scanned PDFs, or images searchable with the built-in, on-device OCR - Add custom, searchable metadata fields to enrich your documents Use generative AI: - Work with your favorite provider and model - Chat with your documents, analyze or summarize them - Transform text or extract text from images and even handwritten notes - Create new images from your data - Find documents using natural language with the AI-powered search assistant - Let the AI make order from chaos, rename documents, add tags, or label or rate them DEVONthink To Go is well-integrated with other apps: - Link to your documents from other apps with universal links - Access all your documents also through the Files app - Clip data from almost any app with the Clip to DEVONthink extension - Use drag-and-drop, inside DEVONthink To Go or between apps - Automate repetitive tasks with Shortcuts actions DEVONthink To Go is great standalone but also works perfectly with DEVONthink for Mac and across multiple devices. Synchronize your databases securely and privately over the local network or through a cloud service of your choice. You decide what data is synced, when, and where. Strong encryption makes sure that your data belongs to you, not to your service provider or us. Privacy policy: https://www.devontechnologies.com/r/privacy End user license agreement: https://www.devontechnologies.com/r/eula
OpenVox Reader
Transform any text into natural-sounding audio for offline listening. Import books, PDFs, documents, and web links. Choose from hundreds of voices, adjust playback speed, and save important sentences. Keep your documents private with local processing.
- Text to audio conversion
- Offline listening
- Import ebooks, PDFs, documents, web links
- Hundreds of natural voices
- Custom voice creation
- Adjustable playback speed
- Save important sentences
- In-document search
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Turn Reading Time into Listening Time OpenVox Reader transforms books, PDFs, documents, web links and text into natural-sounding audio, so you can keep reading while commuting, walking, exercising, resting or working. Import your content, choose from hundreds of voices, create your own custom voice, and listen at your preferred speed without sending your private documents to an online speech service. Listen to Almost Anything Bring all your reading into one simple library: • Import ebooks and PDFs • Add documents and text files • Save web links for listening • Scan printed pages • Paste or type text directly • Organize everything in one place OpenVox Reader can generate and play speech locally on your device, so once the required voices are downloaded, you can listen without an internet connection. Natural Voices You’ll Enjoy Choose from more than 200 voices across 30+ languages and find the voice that best suits your book, article or document. You can also create custom voices for English, German, Italian, Portuguese, and Spanish from a short voice sample using Pocket TTS and listen to your content in a voice you choose. Listen at Your Own Pace Adjust playback from 0.5x all the way to 2.5x with smooth, pitch-preserving audio. Choose convenient presets including: • 0.5x • 1.0x • 1.5x • 2.0x • 2.5x Faster playback is supported with optimized buffering and accurate elapsed and remaining-time calculations. Save Important Sentences Found something worth coming back to? Bookmark the sentence you are currently reading and access it anytime from Saved Sentences. You can: • Save or remove sentences instantly • Browse all saved passages • Filter your saved sentences • Jump directly back to the original location • Delete bookmarks you no longer need Search Inside Your Documents Quickly find words, phrases or sections without scrolling through an entire book or document. Search in Document provides result previews and lets you jump directly to each matching location. EPUB search is optimized chapter by chapter to keep memory usage efficient even with larger books. Listen Without an Internet Connection Keep listening on flights, trains, commutes or anywhere without reliable internet access. Speech generation happens locally, allowing downloaded voices and imported content to remain available when you need them. Private by Design Your documents are processed locally for speech generation rather than being uploaded to a cloud TTS service. OpenVox Reader is built for people who want convenient AI-powered reading while keeping control of their content. Track Your Reading Journey See how much you have actually listened and keep your reading momentum going with: • Listening time • Daily and weekly progress • Reading streaks • Recently opened content • Personal listening statistics Reading time is calculated from audio that was actually spoken, giving you a accurate picture of your listening activity. Made for iPhone and iPad Use OpenVox Reader across iPhone and iPad with iCloud sync for your library. Your content stays organized across your Apple devices, and one purchase unlocks the app on both iPhone and iPad. Read More, Even When You’re Offline Whether you’re travelling, exercising, relaxing, commuting or getting work done, OpenVox Reader helps turn spare moments into meaningful reading time. Download OpenVox Reader and start listening to your reading today.
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Verdict
DEVONthink To Go 4 and OpenVox Reader both sit at 4.7 stars, but that hides the real split: 100% of OpenVox Reader's written reviews are positive against 45% of DEVONthink To Go 4's. OpenVox Reader also leads on monetization model (free vs free with in-app purchases) and update cadence (every 6 days vs every 3 weeks). DEVONthink To Go 4's advantage is ratings volume (242 vs 3). On price, rating, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. DEVONthink To Go 4 sells 2 in-app purchases, starting at $2.99 per month and OpenVox Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for DEVONthink To Go 4 against 4.7 for OpenVox Reader. That said, the two scores are not equally well evidenced: DEVONthink To Go 4 has 242 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 45% of DEVONthink To Go 4's written reviews are positive against 100% of OpenVox Reader's.
DEVONthink To Go 4 ships an update every 3 weeks, OpenVox Reader every 6 days. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.
| Parameter | DEVONthink To Go 4 | OpenVox Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (242 ratings) | 4.7 (3 ratings) |
| Positive reviews | 44.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 242 — better | 3 |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 193 MB | 200 MB |
| Age rating | 17+ | 4+ |
| Developer | DEVONtechnologies, LLC | Nitesh Kumar Sharma |
Customer experience
DEVONthink To Go 4
OpenVox Reader
In-app purchases
DEVONthink To Go 4
- Monthly1 Month trial$2.991 Month
- Yearly1 Month trial$19.991 Year
OpenVox Reader
- OpenVox Reader Pro Lifetime$14.99
Questions
Is DEVONthink To Go 4 free?
Is OpenVox Reader free?
Which has better reviews, DEVONthink To Go 4 or OpenVox Reader?
Do DEVONthink To Go 4 or OpenVox Reader have ads?
Which is updated more often, DEVONthink To Go 4 or OpenVox Reader?
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