smark lock vs PDF Compressor
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
smark lock
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PDF Compressor
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PDF Compressor & Photo Optimizer โ Everything on your iPhone, nothing in the cloud. Shrink PDFs and photos by up to 95% while you blink eyes. No internet required. No uploads. Your files never leave your device. --------------------------------- WHAT YOU CAN DO --------------------------------- COMPRESS PDF Reduce PDF file size with adjustable quality levels. Perfect for email attachments, web uploads, and freeing up storage. COMPRESS PHOTOS Shrink JPEG, PNG and HEIC images while keeping them sharp and shareable. SELECT & SPLIT PAGES Pick only the pages you need from any PDF using a visual thumbnail grid. MERGE & JOIN PDFs Combine multiple PDFs or images into a single document in seconds. PASSWORD LOCK & UNLOCK Protect sensitive PDFs with a password or remove password from encrypted files โ all on-device, no cloud key storage. RECENT FILES Instantly access and re-share your recently compressed or edited files. ADD SIGNATURE Append signature to your PDFs and share them instantly ----------------------------------------- WHY CHOOSE PDF COMPRESSOR ----------------------------------------- 100% on-device - your documents never leave your iPhone or iPad No account, no subscription required to get started Works offline - compress on a plane, in a meeting, anywhere Supports Files app - open and save directly from iCloud, Dropbox and more iPad & Mac (Apple Silicon) ready Perfect for students, professionals, lawyers, and anyone who handles PDFs regularly.
Screenshots
Verdict
The clearest difference is in-app purchases: smark lock at none against PDF Compressor's 3. smark lock also leads on ads (none vs shown) and iOS requirement (13.0 vs 16.2). PDF Compressor's advantage is update cadence (every 3 weeks vs every 4 months). On price 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
Both are free to download. PDF Compressor sells 3 in-app purchases, starting at $2.99 per month. smark lock asks for nothing beyond the download.
smark lock ships an update every 4 months, PDF Compressor every 3 weeks. Both last shipped on September 9, 2026.
| Parameter | smark lock | PDF Compressor |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 3 weeks โ better |
| Ads | No โ better | Yes |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 โ better | 16.2 |
| Further details โ not scored | ||
| Size | 40 MB | 31 MB |
| Age rating | 17+ | 4+ |
| Developer | ้ ็ | Swetha MB |
In-app purchases
smark lock
No in-app purchases
PDF Compressor
- Unlock All Photo PDF functionality$2.991 Month
- Unlock All Photo PDF functionality$9.996 Months
- Unlock All Photo PDF functionality$14.991 Year
Questions
Is smark lock free?
Is PDF Compressor free?
Do smark lock or PDF Compressor have ads?
Which is updated more often, smark lock or PDF Compressor?
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