Comparison

PDF Viewer vs Notsure

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PDF Viewer

Easily convert various file formats to PDF and back again. This app supports conversions from images, documents, and presentations, allowing you to manage and share your files efficiently. It also offers OCR capabilities to convert photos into editable text.

Highlights
  • Convert JPG, Word, Excel, PPT to PDF
  • Convert PDF to other formats
  • Share and save converted files
  • Access conversion history
  • Pull files from iCloud or gallery
  • Convert Photos to Text (OCR)
Read full description

PDF Viewer makes file conversions easy, fast, and completely free. Convert files like JPG, Word, Excel, PPT, and more to PDF or convert PDFs back to other formats all from your iPhone.  Here’s what you can do with PDF Viewer: ● Convert files from popular formats like JPG, DOC, XLS, PPT, TXT, RTF, EPUB, and many more to PDF ● Convert PDF files back into various formats ● Share or save your converted files directly to iCloud or other apps ● Access and manage your conversion history ● Pull files from iCloud, your photo gallery, or capture a new image for conversion ● Share converted files via iMessage, open them in other apps, print, or save them to your Files app ● Convert Photos to Text ———————————————————— ◆ How to convert files with PDF Viewer ◆ 1. Select the file you want to convert 2. Choose your desired output format (PDF or another) 3. Tap the “Convert” button 4. Your file will be instantly converted (you can then save it, share it, or access it from your history) ———————————————————— PDF Viewer subscription policy: Once you sign up to PDF Viewer Premium, you will have full access to all of PDF Viewer’s features for free for 3 days. You can cancel your subscription any time and you will be sent a reminder before your PDF Viewer subscription begins after your trial. PDF Viewer Premium Subscription: - With a PDF Viewer Premium subscription you have access to all of PDF Viewer’s advanced PDF editing features, and access to all future updates. - PDF Viewer Premium monthly subscription is billed monthly for $4.99, and payment will be charged to iTunes Account after a 3 day free trial. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. - Subscriptions can be managed by the user and auto-renewal can be turned off by going to the user's iPhone Settings -> Apple ID -> Subscriptions. ———————————————————— Connect with us on X and Instagram: @AndrewLeeReal Have any questions or recommendations? Feel free to reach out to me at: Andrew@AndrewLee.Ventures Privacy Policy: http://andrewlee.ventures/privacy Terms of Use: http://andrewlee.ventures/terms

About

Notsure

Features
Read full description

Some actions leave no room for regret. A deleted account, a transferred sum, a message sent — once executed, it's done. You know this. Which is why your finger is still hovering over the screen. Notsure is the buffer that exists in that one second before. No advice. No judgment. No record of anything you do here. Just a neutral behavioral framework — a final physical gap before the point of no return. 【 When will you need Notsure? 】Not hypothetical. The irreversible moments you're about to face: • The message you can't take back: wanting to reach out to an ex, an impulsive text after a breakup, a declaration of no return during a fight. In the second before you hit send, you need a neutral layer to cool down in. • Digital assets you can't chase: large crypto transfers, international wire transactions. At the last moment before assets leave your control, trigger a second rational physical confirmation. • Digital self-deletion: removing a social account you built over years, wiping all cloud backups. Before data disappears permanently, complete one final behavioral review. • Authorizing an AI agent to act: before you hand decision authority to an automated AI agent for sensitive tasks. Before AI runs faster than your brain, hold the manual switch. 【 82 irreversible digital actions, in 6 defense layers 】From permanent data deletion and asset transfer to authorizing AI agents to act on your behalf. Each has a clearly defined irreversibility mechanism, aligned with GAP-NLP-1.0. Entering Notsure is not about stopping you. It's about knowing that in the second before you press, this neutral space exists. No feelings asked. No suggestions made. No record kept. Stop, or continue. The decision is always yours. 【 After You Enter 】 When you choose the context, a sentence appears on screen. Not advice. Not a question. Just one sentence that describes this moment — precise enough to make you stop. You don't need to do anything with it. It's just there. Many people find themselves entering a quiet state at this moment — not because they were guided, but because something caught this moment and gave the thought somewhere to land. That's what the neutral layer does. Not to stop you. Not to persuade you. Just to give you a space to actually pause before you act. Built on THE GAP Framework. Compliant with GAP-NLP-1.0. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

PDF Viewer4 screens
Notsure3 screens

Verdict

The call

The clearest difference is update cadence: Notsure at weekly against PDF Viewer's every 3 months. PDF Viewer's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. PDF Viewer sells 2 in-app purchases, starting at $4.99 per month and Notsure sells 1 in-app purchase, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDF Viewer ships an update every 3 months, Notsure weekly. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 8 level
PDF Viewer versus Notsure: the parameters behind the verdict, then further details
ParameterPDF ViewerNotsure
PriceFreeFree
Rating4.8 (243 ratings) — better—
Positive reviews89.5% of reviews—
Number of ratings243 — better—
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size11 MB3 MB
Age rating4+4+
DeveloperAndrew LeeHsieh ChiaMing

Bugs and requests

PDF Viewer

Reported bugs

4 issues
  • App doesn't function on iPad mini (current model)
  • Forced review requirement blocks app access
  • Document quality issues when converting images to PDF
  • Occasional glitches during operation

Requested features

5 requests
  • Add file deletion functionality
  • Implement in-app camera scanning feature
  • Add page merge and delete options
  • Include file size/quality customization
  • Support for more device types (iPad compatibility)

Notsure

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

PDF Viewer

Subscriptions1
  • PDF Converter: Premium3 Days trial$4.991 Month
One-time1
  • PDF Converter: PremiumFree
1 purchases

Notsure

Subscriptions1
  • Notsure Annual$19.991 Year

Questions

Is PDF Viewer free?
PDF Viewer is free to download, with in-app purchases available.
Is Notsure free?
Notsure is free to download, with in-app purchases available.
Do PDF Viewer or Notsure have ads?
Neither PDF Viewer nor Notsure shows ads.
Which is updated more often, PDF Viewer or Notsure?
PDF Viewer ships an update every 3 months, and Notsure weekly. Most recently, PDF Viewer was updated on October 24, 2026 and Notsure on October 13, 2026.

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