Smart PDF+ Editor vs KTrunk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart PDF+ Editor
This app allows users to read, sign, and annotate PDF documents, especially with stylus input. It's designed for professionals to quickly handle documents and for students to take notes on study materials. Features include a built-in file manager for organization.
- Ink annotations
- Document signing
- File organization
- PDF reading
- Document sharing
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Smart PDF is a PDF editor specially optimized for ink annotations. Use it with an Apple Pencil for the ultimate ease in note taking. Great for professionals Quickly sign and send documents. Review, annotate and share files with your colleagues. Great for students If you spend a lot of time reading and studying documents on your iPad, then Smart PDF is an indispensable tool for getting the most out of your study time. Take notes on documents in class, or while studying at home. Keep all your files organized with the built-in file manager, with color-coded categories. We hope you enjoy Smart PDF! -- The App Makers @ Qrayon
KTrunk
This note-taking app allows you to save ideas with attached files and photos. You can create links between notes and files, and synchronize your data across devices. An optional in-app purchase enables note encryption for enhanced privacy.
- Save ideas with files and photos
- Link notes to other notes and files
- Synchronize across devices via iCloud
- Notes saved in HTML format
- Optional note encryption
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Knowledge Trunk - or short KTrunk - is a note taking App. Use KTrunk to save all your ideas augmented with related files and photos. You can establish links from one note to any other note or file in KTrunk. The notes are saved in html-format and can be synchronized across your devices using iCloud. In-App-Purchases: * Privacy Allows to encrypt/decrypt your notes.
Screenshots
Verdict
The clearest difference is price: KTrunk at Free against Smart PDF+ Editor's $4.99. KTrunk also leads on review sentiment (50% vs 5%) and rating (5.0 vs 3.8). Smart PDF+ Editor's advantage is in-app purchases (none vs 3) and ratings volume (53 vs 2). On ads and device support 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
KTrunk is free to download; Smart PDF+ Editor costs $4.99 up front. KTrunk sells 3 one-off in-app purchases. Smart PDF+ Editor asks for nothing beyond the download.
KTrunk holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Smart PDF+ Editor has 53 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 5% of Smart PDF+ Editor's written reviews are positive against 50% of KTrunk's.
Smart PDF+ Editor ships an update every 4 months, KTrunk monthly. The most recent releases landed on September 17, 2026 and June 4, 2026 respectively.
| Parameter | Smart PDF+ Editor | KTrunk |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.8 (53 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 5.3% of reviews | 50.0% of reviews — better |
| Number of ratings | 53 — better | 2 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 11 MB | 10 MB |
| Age rating | 4+ | 17+ |
| Developer | Qrayon, LLC | Clemens Schuetzdeller |
Customer experience
Smart PDF+ Editor
KTrunk
In-app purchases
Smart PDF+ Editor
No in-app purchases
KTrunk
- Operating Convenience$0.99
- Privacy$1.99
- #Tag-Proposals$1.99
