Comparison

Image to PDF vs STACK

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

Head to head
About

Image to PDF

Features
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The easiest way to convert your photos and images to PDF documents. Key Features: - Select multiple images from your library - Instantly convert to PDF - Share via email, messages, or any app - No watermarks, completely free - Works offline - Simple and intuitive interface Download now and easily create PDFs from your photos!

About

STACK

Features
Read full description

STACK is a chip tray for a real poker game. You deal real cards; STACK keeps the money straight. Everyone at the table opens the app, types the same four-letter code, and sees the same chips. Nothing to buy, nothing to count, nothing to lose down the side of the sofa. WHAT IT DOES โ€ข Tracks every stack, the pot, and the blinds โ€ข Knows whose turn it is, so nobody has to ask โ€ข Handles side pots when someone is all in โ€” the part everyone gets wrong โ€ข Works out who owes who at the end, in the fewest payments possible โ€ข Re-buy any time; it all gets counted at settle-up BUILT FOR A REAL TABLE The app never sees your cards. You shuffle, you deal, you read each other across the table. STACK holds the chips and does the arithmetic, so the game stops pausing while five people argue about the maths. DROPPED SIGNAL? NO PROBLEM Phones lock and wifi drops. STACK puts you straight back in your seat, mid-hand, with your stack intact. NO ACCOUNTS, NO ADS No sign-up, no email address, no advertising, no tracking. Open it, type a code, play.

Screenshots

Image to PDF4 screens
STACK4 screens

Verdict

The call

The clearest difference is ads: STACK at none against Image to PDF's shown. STACK also leads on update cadence (every 8 days vs every 5 weeks) and iOS requirement (13.0 vs 16.0). On price, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Image to PDF ships an update every 5 weeks, STACK every 8 days. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

Scorecard3 real differences ยท 3 level
Image to PDF versus STACK: the parameters behind the verdict, then further details
ParameterImage to PDFSTACK
PriceFreeFree
Update frequencyEvery 5 weeksEvery 8 days โ€” better
AdsYesNo โ€” better
In-app purchasesNoNo
DevicesiPhoneiPhone, iPod โ€” better
Requires iOS16.013.0 โ€” better
Further details โ€” not scored
Size5 MB18 MB
Age rating4+4+
Developer4Hours SoftWen-Jen Chen

In-app purchases

None

Image to PDF

No in-app purchases

None

STACK

No in-app purchases

Questions

Is Image to PDF free?
Image to PDF is free to download, with no in-app purchases.
Is STACK free?
STACK is free to download, with no in-app purchases.
Do Image to PDF or STACK have ads?
Image to PDF shows ads; STACK does not.
Which is updated more often, Image to PDF or STACK?
Image to PDF ships an update every 5 weeks, and STACK every 8 days. Most recently, Image to PDF was updated on October 12, 2026 and STACK on October 10, 2026.

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