Comparison

PDF Password vs Strange Clocks

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

Head to head
About

PDF Password

Secure your PDF documents by adding or removing password protection directly on your device. This app allows you to encrypt files with AES-256 protection or remove existing passwords when the current one is known. All processing happens locally for enhanced privacy.

Highlights
  • Add AES-256 password protection
  • Remove known PDF passwords
  • Process multiple files
  • On-device processing
  • Cancel processing option
  • Preview unlocked files
Features
Read full description

Manage PDF passwords directly on your device. Remove an open password when you know the current password, or add AES-256 password protection to a PDF that is not protected yet. REMOVE A KNOWN PDF PASSWORD Select a protected PDF, enter its current password and create an unlocked copy. Keep a convenient copy of documents you are authorized to use. This app does not guess, crack or recover forgotten passwords. PROTECT A PDF WITH A PASSWORD Set a new open password and confirm it before processing. The app creates a separate encrypted PDF copy; your original file is not overwritten. MULTIPLE FILES, CLEAR RESULTS Choose one or several PDFs, process them in order and review the result for each file. Save successful copies, share them with another app or open a preview. You can cancel processing. ON-DEVICE PDF PROCESSING PDF contents and passwords are processed locally, without uploading your documents to a server. Useful for contracts, certificates and everyday work documents. PLEASE NOTE • The current password is required to unlock a protected PDF. • Keep new passwords safe; forgotten passwords cannot be recovered. • Digitally signed documents are not converted, to help preserve their signatures. • Processing is subject to the displayed daily allowance and rewarded credits. Rewarded ads may provide additional credits. • Advertising and optional usage statistics or diagnostics may use a network connection. Manage collection choices in Settings. Support: appsupport@bokeriastudio.com

About

Strange Clocks

Features
Read full description

Strange Clocks turns "what time is it?" into a small daily puzzle. Instead of one clock face, you get 15, each a different, real way humans (and machines) have told time throughout history: from a Cold War-era German clock made of lamps to the way a resistor's color bands encode a number. Every clock is stranger than the last, but none of them stay strange for long. Each one ships with a short animated guide that highlights exactly what to read and when, plus a live calculation line so you can watch the math happen in real time. WHAT'S INSIDE - 15 unusual clocks: Berlin Clock, Word Clock, Binary Clock, Cistercian Clock, Fibonacci Clock, Tix Clock, Hex Clock, Maya Clock, Moon Clock, Polar Clock, Resistor Clock, Decimal Time, Internet Time, Roman Hours, and the Prague Orloj. - An animated how-to-read guide for every single clock, no exceptions. - Widgets for Home Screen, Lock Screen, and StandBy, in small and medium sizes. - Clock Wall mode: turn your iPhone, or the inner display of iPhone Duo, into a live wall of clocks, screensaver-style. - 10 languages: English, Spanish, Simplified Chinese, Japanese, German, French, Brazilian Portuguese, Russian, Korean, and Italian. ONE CLOCK ON US Pick any clock as your gift and keep it free, forever: live in the app, on your widgets, and in StandBy. Every how-to-read guide is free for all 15. Want them all? A single one-time purchase of $1.99 unlocks every clock. No subscription, no recurring charges, no ads, and no tracking, ever. PRIVACY Strange Clocks doesn't collect your data. The one place it asks for location, to compute local sunrise and sunset for the Roman Hours clock, is used entirely on your device and never leaves it. Fifteen clocks. One phone. Zero reasons to know what time it "normally" is.

Screenshots

PDF Password4 screens
Strange Clocks4 screens

Verdict

The call

The clearest difference is in-app purchases: PDF Password at none against Strange Clocks's 1. PDF Password also leads on iOS requirement (15.0 vs 17.0). Strange Clocks's advantage is ads (none vs shown) and update cadence (every 3 days vs every 3 weeks). On price 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

Both are free to download. Strange Clocks sells 1 one-off in-app purchase. PDF Password asks for nothing beyond the download.

UpkeepUpdate frequency

PDF Password ships an update every 3 weeks, Strange Clocks every 3 days. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
PDF Password versus Strange Clocks: the parameters behind the verdict, then further details
ParameterPDF PasswordStrange Clocks
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 weeksEvery 3 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size14 MB9 MB
Age rating4+4+
DeveloperBokeriaKIP Networks

In-app purchases

None

PDF Password

No in-app purchases

1 purchases

Strange Clocks

One-time1
  • Unlock all 15 clocks$1.99

Questions

Is PDF Password free?
PDF Password is free to download, with no in-app purchases.
Is Strange Clocks free?
Strange Clocks is free to download, with in-app purchases available.
Do PDF Password or Strange Clocks have ads?
PDF Password shows ads; Strange Clocks does not.
Which is updated more often, PDF Password or Strange Clocks?
PDF Password ships an update every 3 weeks, and Strange Clocks every 3 days. Most recently, PDF Password was updated on November 11, 2026 and Strange Clocks on October 31, 2026.

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