Comparison

RulerBasic vs PDF Studio

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

Head to head
About

RulerBasic

Features
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Turn your device into a simple on-screen ruler for quick everyday measurements. RulerBasic helps you check the size of small objects, compare lengths, and measure in centimeters or inches without extra tools. Open the app, place the object on the screen, and use a clean ruler view designed for fast, practical size checks. Why RulerBasic? • Clean digital ruler interface • Centimeter and inch measuring • Useful for desks, crafts, DIY, school, and quick size checks • Simple design with no unnecessary steps • Lightweight, fast, and easy to use Whether you are measuring stationery, small parts, craft materials, or everyday objects, RulerBasic gives you a handy measuring tool whenever you need one. Download RulerBasic and keep a practical ruler in your pocket.

About

PDF Studio

This app offers a comprehensive suite of tools for managing PDF files on your iPhone. It allows you to edit, compress, convert, scan, protect, and organize your documents entirely on your device for maximum privacy.

Highlights
  • Edit and organize PDF pages
  • Convert PDF to Text, HTML, Excel, JPG, PNG, BMP
  • Compress PDF file size
  • Merge and split PDF documents
  • Scan documents with camera
  • Add password protection and signatures
  • Convert images to PDF
Features
Read full description

PDF Studio: PDF Converter is your complete PDF editor, scanner, and file converter for iPhone. It brings all the essential PDF tools together in one fast, simple, and powerful app. Whether you want to compress, merge, split, convert, protect, organize, or scan documents, PDF Studio makes it easy. Everything is processed entirely on your device, ensuring complete privacy with no internet required. PDF Studio includes every major tool you need: • PDF Editor – Modify and organize your PDF pages • PDF Converter – Convert PDF to Text, HTML, Excel (CSV), JPG, PNG, BMP • Compress PDF – Reduce file size while maintaining quality • Merge PDF – Combine multiple PDFs into a single file • Split PDF – Separate pages or create new documents • Image to PDF – Turn photos and scans into professional PDFs • PDF Scanner – Scan documents using your camera • PDF Reader – Fast and smooth PDF viewing • Protect PDF – Add password protection • Unlock PDF – Remove existing passwords • Sign PDF – Add your handwritten signature • Watermark PDF – Insert custom text or image watermarks • Remove Pages – Instantly delete pages • Extract Pages – Save selected pages as a new PDF • Add Page – Insert blank or image-based pages • Rearrange PDF – Easily reorder pages • Rotate PDF – Rotate one or multiple pages • Crop PDF – Trim unwanted areas • Page Numbers – Add customizable numbering • PDF to Image – Export pages to JPG, PNG, or BMP • Image Conversion – Convert images to PNG, JPG, or BMP • Create ZIP – Compress multiple files into a ZIP archive • Extract ZIP – Open and extract ZIP files Advanced conversion tools include: • PDF to Text for easy copying • PDF to HTML for web-friendly formatting • PDF to Excel (CSV) for data extraction • PDF to JPG, PNG, BMP for high-quality image export • PNG, JPG, BMP to PDF for easy document creation This makes PDF Studio ideal for business, schoolwork, office documents, scanned files, photos, receipts, and more. Why Choose PDF Studio: PDF Converter? • 100% Offline Processing – Files stay on your device • No Subscriptions – One-time purchase unlocks everything • Fast and Secure – No uploads, no servers, complete privacy • Easy to Use – Clean and intuitive design • Full Featured – Replace multiple PDF apps with one Perfect For • Students needing PDF notes, homework, and scanned pages • Professionals working with contracts, forms, and reports • Anyone who needs a fast, reliable, and private PDF editor and converter Supported Devices • iPhone

Screenshots

RulerBasic4 screens
PDF Studio4 screens

Verdict

The call

The clearest difference is in-app purchases: PDF Studio at none against RulerBasic's 4. RulerBasic's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement 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. RulerBasic sells 4 in-app purchases, starting at $2.99 per month. PDF Studio asks for nothing beyond the download.

UpkeepUpdate frequency

RulerBasic ships an update fortnightly, PDF Studio monthly. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
RulerBasic versus PDF Studio: the parameters behind the verdict, then further details
ParameterRulerBasicPDF Studio
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyFortnightly — betterMonthly
AdsNo — betterYes
In-app purchasesYesNo — better
Monetization—Free with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size15 MB46 MB
Age rating4+4+
DeveloperHakan KabaAsha Vaghasiya

In-app purchases

4 purchases

RulerBasic

Subscriptions1
  • Room Scan Pro$2.991 Month
One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$9.99
None

PDF Studio

No in-app purchases

Questions

Is RulerBasic free?
RulerBasic is free to download, with in-app purchases available.
Is PDF Studio free?
PDF Studio is free to download, with no in-app purchases.
Do RulerBasic or PDF Studio have ads?
PDF Studio shows ads; RulerBasic does not.
Which is updated more often, RulerBasic or PDF Studio?
RulerBasic ships an update fortnightly, and PDF Studio monthly. Most recently, RulerBasic was updated on October 10, 2026 and PDF Studio on October 24, 2026.

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