Comparison

SIGMO vs PDFz

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

Head to head
About

SIGMO

Features
Read full description

SIGMO App connects to an existing SIGMO instance (available from release version 3.2 upwards). This app requires a valid account for a SIGMO instance. - Aircraft status - Maintenance (work requests) - AOG Status - Airport List & Briefing - Arrival/Departure List (Schedule) Any AOG status update or work request for line maintenance engineers arrive with push notifications. The aircraft status and airport briefing are also available in offline mode. Data protection directive of the airline operator applies.

About

PDFz

Easily scan documents, convert images to PDFs, and merge or split files. Secure your sensitive information with passwords and watermarks. Organize pages, optimize file sizes, and share securely.

Highlights
  • High-quality document scanning
  • Convert images to PDF
  • Merge and split PDFs
  • Password protection
  • Add watermarks and signatures
  • Organize pages
  • Secure sharing
Features
Read full description

PDFz turns your iPhone into a complete PDF office: scan, edit, sign, fill forms, convert and share — in English and Arabic, side by side. SCAN ANYTHING • Point the camera. The page is found, straightened and cleaned before you lift your thumb. • Filters for shadows, handwriting and colour. Multi-page in one go. • ID cards: front and back on a single page. Passport and visa photos in official sizes. • Long receipts stitched from several shots. Books split into left and right pages. EDIT IT LIKE A DOCUMENT, NOT A PICTURE • Edit the text that is already on the page. Move and resize images. Add, reorder and rotate pages. • Text, markup and signatures are live layers you can move — not pixels you have to redo. • Watermark, page numbers, permanent redaction, full undo history. SIGN AND FILL • Draw your signature, type it, or lift it from paper. It stays saved on the device. • Fill real PDF forms: tick boxes, dropdowns, required fields — and it stays a form. • Start from a blank page and build your own form. CONVERT • PDF to Word, Excel and PowerPoint with layout, tables and bilingual text kept in reading order. Processed on the PDFz server and deleted the moment it finishes. • Images to PDF, PDF to images, one long image, print. ORGANISE AND FIND • Search the words inside every document — OCR included. • Merge, split, extract pages. Compress with the new size shown before you commit. • Password-protect any PDF. Lock folders with Face ID. • Share over Wi-Fi to any browser on your network. No cloud account. TRANSLATE • Translate a whole document on the page and save it, or translate live through the camera. MADE FOR ARABIC AND ENGLISH Right-to-left layout, bilingual pages that stay side by side, Arabic and English OCR. Available in 49 languages. PRIVACY No account. Scanning, editing, signing and OCR run on the device. Conversion files are deleted from the server as soon as your download is ready. PDFz PLUS Some features need PDFz Plus — weekly, monthly or yearly, with a free trial. Payment is charged to your Apple ID account. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel in Settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

SIGMO2 screens
PDFz4 screens

Verdict

The call

The clearest difference is price: PDFz at Free against SIGMO's $1.99. PDFz also leads on update cadence (every 10 days vs every 5 weeks). SIGMO's advantage is iOS requirement (12.0 vs 18.0). On 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

PDFz is free to download; SIGMO costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SIGMO ships an update every 5 weeks, PDFz every 10 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
SIGMO versus PDFz: the parameters behind the verdict, then further details
ParameterSIGMOPDFz
Price$1.99Free — better
Rating—5.0 (4 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—4 — better
Update frequencyEvery 5 weeksEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size25 MB45 MB
Age rating4+4+
DeveloperManuel JavorikKhaled Khalifa

In-app purchases

None

SIGMO

No in-app purchases

None

PDFz

No in-app purchases

Questions

Is SIGMO free?
SIGMO costs $1.99, with no in-app purchases.
Is PDFz free?
PDFz is free to download, with no in-app purchases.
Do SIGMO or PDFz have ads?
Neither SIGMO nor PDFz shows ads.
Which is updated more often, SIGMO or PDFz?
SIGMO ships an update every 5 weeks, and PDFz every 10 days. Most recently, SIGMO was updated on November 1, 2026 and PDFz on October 30, 2026.

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