Backup Disk vs PDF Lock & Unlock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Backup Disk
Read full descriptionHide full description
Backup Disk turns your iPhone or iPad into a private backup disk for your Mac. Choose the folders you want to protect on your Mac, open Backup Disk on your iPhone or iPad, and sync them over Wi‑Fi with a single tap. Your files go straight from your Mac to your device — no accounts, no cloud, no tracking. WHY BACKUP DISK • Wireless: your Mac appears automatically on the same Wi‑Fi network, or connect with a cable. • Fast: only changed files are copied, and small files travel in large packages to make the most of your network. • Private: pair with the sync key shown on your Mac. Your files never pass through a server. • Always with you: browse your backups in the app or in the Files app, even offline. • Both ways: download any backed-up folder or file from your iPhone or iPad back to your Mac. • Picks up where it left off: if a sync is interrupted, the next one copies only what's left. HOW IT WORKS 1. Install Backup Disk on your Mac and on your iPhone or iPad. 2. On your Mac, add the folders you want to back up. 3. On your iPhone or iPad, choose your Mac, enter the sync key and tap Sync. BACKUP DISK PRO The free version stores up to 5 GB of backups per device and connects one device at a time. PRO removes the storage limit and lets you connect several iPhones and iPads to your Mac at once. One purchase unlocks PRO on iPhone, iPad and Mac with the same Apple Account. PRO is available as a monthly or yearly subscription, or as a one-time purchase. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel your subscription in your Apple Account settings. Terms of Use: https://backupdisk.mozkan.com/terms.html Privacy Policy: https://backupdisk.mozkan.com/privacy.html
PDF Lock & Unlock
Read full descriptionHide full description
PDF Lock & Unlock lets you securely protect your PDF files with a password or remove the password when you need access again. Everything works fully offline — your documents never leave your device. Key Features • Lock PDFs with a password • Unlock PDFs using the correct password • Fully offline — no internet, no server • Fast and lightweight • Simple and clean interface Your privacy matters. All PDF processing happens locally on your device. Ideal for protecting sensitive documents, sharing secured PDFs, or removing passwords from your own files. No subscriptions. No tracking. Just a focused PDF utility.
Screenshots
Verdict
The clearest difference is price: Backup Disk at Free against PDF Lock & Unlock's $0.99. PDF Lock & Unlock's advantage is in-app purchases (none vs 3). On ads, 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
Backup Disk is free to download; PDF Lock & Unlock costs $0.99 up front. Backup Disk sells 3 in-app purchases, starting at $2.99 per month. PDF Lock & Unlock asks for nothing beyond the download.
| Parameter | Backup Disk | PDF Lock & Unlock |
|---|---|---|
| Price | Free — better | $0.99 |
| Update frequency | Every 9 months | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Muharrem Ozkan | StudyBridge LLC |
In-app purchases
Backup Disk
- Backup Disk PRO Monthly$2.991 Month
- Backup Disk PRO Annual3 Days trial$9.991 Year
- Backup Disk PRO Lifetime$19.99
PDF Lock & Unlock
No in-app purchases
Questions
Is Backup Disk free?
Is PDF Lock & Unlock free?
Do Backup Disk or PDF Lock & Unlock have ads?
Other comparisons















