PDF Pro vs AskRobots Slate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Pro
Edit, annotate, and read PDF documents on your iPhone and iPad. Highlight text, add notes, shapes, voice recordings, and photos. Search your entire PDF library, fill out forms, and sign documents.
- Edit and annotate PDFs
- Highlight text and add notes
- Embed audio and photo annotations
- Full-text search of PDF library
- Fill out and sign PDF forms
- Organize PDFs with folders and tags
- Import from cloud storage
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PDF Pro lets you read, edit and annotate your PDF documents directly on your iPhone and iPad. Highlight text, take notes, embed shapes or draw with your finger. You can even embed voice recordings or photo annotations. Full-text-search your entire PDF library with just a single tap. Above all PDF Pro comes with full-featured PDF form and signature support. Key-Features At A Glance: • POWERFUL SEARCH: ∙ Full-text-search your entire PDF library. ∙ Search inside specific documents with easy navigation through the search results. ∙ Look-up selected text directly on Wikipedia or in the included dictionaries. • FILE-MANAGEMENT: ∙ Group your PDFs in folders and tag them with colorful labels. ∙ Import PDFs from your Dropbox®, Microsoft OneDrive® or Google Drive®. ∙ Add PDFs via USB or WiFi. ∙ Open E-Mail attachments. • CLEAR VIEW: ∙ Easily browse through all your annotations. ∙ Full PDF outline support. You can even search the outline. ∙ Get an overview of all your bookmarked or annotated pages just with a single tap. • SHARE and PRINT: ∙ Easily share your annotated documents with your friends or co-workers. ∙ Print your annotated and edited PDFs. ∙ You can even share or print single pages of a document. • HIGH SPEED and STABILITY: ∙ Rapid viewing of PDF documents. ∙ Smooth display of very large PDF files. • NIGHT MODE: ∙ Makes reading in the dark much easier on the eyes. • SECURITY: ∙ Support for password-protected PDFs • AND MUCH MORE... Premium Features and Premium Offer include: • ANNOTATIONS and NOTES: ∙ Highlight text, take notes or draw with your finger. ∙ Powerful shape editor for arrows, rectangles, circles, lines and much more. ∙ Embed audio and photo annotations into your PDFs. ∙ Use predefined stamps or create your own. • DOCUMENT EDITOR: ∙ Create new pages. ∙ Export pages or merge them into existing documents. ∙ Reorder, rotate and delete pages. • CONTENT EDITOR: • Modify the existing content of PDF documents. • MULTITASKING: ∙ Work with multiple PDFs at a time. ∙ Copy and paste annotations, shapes, images or text from one PDF document into another. • FORM SUPPORT: ∙ Just fill out your PDF form, sign it with your handwritten signature and you are ready to send it via E-Mail or print it via AirPrint®. A monthly or annual subscription is required to get access to all premium features and premium offer. --- Subscriptions automatically renew monthly or yearly depending on your plan unless auto-renew is turned off at least 24-hours before the end of the current period. Plans are priced at $3.99USD monthly and $24.99USD yearly (pricing may vary in countries other than the U.S.). Payment will be charged to your App Store Account at confirmation of purchase. To avoid automatic renewal, you must turn off auto-renew at least 24 hours before your subscription ends. You can turn off auto-renew at any time from your App Store Account Settings. Terms of Use: https://pdf-pro.net/terms-of-service/ Privacy Policy: https://pdf-pro.net/privacy-policy/
AskRobots Slate
A straightforward digital drawing surface for capturing quick notes, sketches, lists, and diagrams. Start drawing instantly with touch, stylus, or mouse. Sync your creations across devices via iCloud.
- Instant drawing with finger, stylus, or mouse
- Save and open drawings
- Start new blank pages
- Delete current page
- iCloud sync across iPhone and iPad
- No account required
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AskRobots Slate is a simple drawing slate for quick notes, sketches, lists, diagrams, and ideas. Open the app and draw immediately with your finger, Apple Pencil, or a mouse on supported devices. Save drawings, open previous drawings, start a new blank page, or delete the current page. Saved drawings sync across your iPhone and iPad with iCloud when iCloud is enabled. No account is required.
Screenshots
Verdict
The clearest difference is in-app purchases: AskRobots Slate at none against PDF Pro's 12. AskRobots Slate also leads on rating (5.0 vs 4.7) and iOS requirement (13.0 vs 17.0). PDF Pro's advantage is ratings volume (6.9K vs 1) and device support. On price 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. PDF Pro sells 12 in-app purchases, starting at $1.99 per month. AskRobots Slate asks for nothing beyond the download.
AskRobots Slate holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PDF Pro has 6.9K ratings behind it against 1, so its average is the more settled of the two.
| Parameter | PDF Pro | AskRobots Slate |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (6.9K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 6.9K — better | 1 |
| Update frequency | Every 2 months | — |
| Ads | No | — |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | Free — better |
| Devices | iPhone, iPad, Mac — better | — |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 97 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Dominic Rodemer | Daniel Quellhorst |
Bugs and requests
PDF Pro
Reported bugs
5 issues- Annotations and highlights randomly disappearing
- Compatibility issues with newer iOS versions
- Corrupted PDF files after editing
- Slow performance on older devices
- Inconsistent behavior when switching between PDFs
Requested features
5 requests- Improved bookmarking and note-taking
- Seamless iCloud/cloud storage integration
- Customizable keyboard shortcuts
- Advanced text editing and OCR capabilities
- Better organization and folder management
AskRobots Slate
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PDF Pro
- Offer - Monthly - macOS3 Days trial$1.991 Month
- Offer - Monthly - iOS3 Days trial$2.991 Month
- Premium - Monthly - iOS3 Days trial$3.991 Month
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- Premium - Monthly - macOS3 Days trial$4.991 Month
- Offer - Annual - iOS3 Days trial$12.991 Year
- Offer - Annual - macOS3 Days trial$22.991 Year
- Premium - Annual - iOS3 Days trial$24.991 Year
- Offer - macOS + iOS3 Days trial$24.991 Year
- Offer - iOS + macOS3 Days trial$29.991 Year
- Premium - Annual - macOS3 Days trial$44.991 Year
- Premium - iOS + macOS3 Days trial$49.991 Year
- Premium - macOS + iOS3 Days trial$49.991 Year
AskRobots Slate
No in-app purchases








