Comparison

LocalClock vs Crimson Pdf

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

Head to head
About

LocalClock

Features
Read full description

Tired of juggling time zones? This simple and easy-to-use app lets you convert any time zone to your current local time instantly. No more complicated calculations or scrolling through endless time zone charts. Simply enter the time and time zone you want to convert and get an accurate result. Perfect for: - Planning meetings with colleagues across different time zones - Keeping track of events or deadlines in other countries - Checking on friends and family in different locations - Traveling and staying organized with time differences Download now and make time zone conversions a breeze!

About

Crimson Pdf

This app offers a comprehensive suite of PDF editing and management tools, all processed locally on your device. Convert, scan, sign, and organize documents with advanced features like OCR and form filling. It prioritizes user privacy with no data collection or network requests for core functions.

Highlights
  • Convert PDFs to various formats (Word, Excel, images)
  • Scan documents with OCR and auto edge detection
  • Sign and annotate PDFs with Apple Pencil support
  • Organize pages, merge, split, and compress files
  • Fill and save PDF forms
  • 100% on-device processing for privacy
  • Available in 17 languages
Features
Read full description

Crimson Pdf is the everyday PDF toolkit for iPhone and iPad. Convert, scan, sign, edit and protect documents — all 100% on-device. Nothing uploaded, nothing tracked, completely free with no in-app purchases or ads. Whether you're sending an invoice from a coffee shop, signing a lease before a viewing, or compressing a 200-page report for email, Crimson handles it in seconds. Powered by Apple's native PDFKit, VisionKit and PencilKit frameworks for instant offline processing. ■ CONVERT — 10 TOOLS Turn PDFs into Word (DOCX / RTF), Excel (XLSX), PowerPoint (PPTX), images (JPG / PNG), plain text and CSV. Convert back the other way: images, Word (.docx / .doc / RTF / HTML / TXT), Excel spreadsheets and PowerPoint slides into clean PDFs. ■ SCAN & OCR Snap any printed page with the built-in scanner — auto edge detection, perspective correction, multi-page output. Extract searchable text from photos and PDFs using Apple's on-device Vision framework. Nothing is sent to a server. ■ SIGN & ANNOTATE Draw your signature with Apple Pencil or finger using PencilKit, then stamp it onto any contract. Highlight, add sticky notes, and erase — all with precise tap targeting on the page. ■ ORGANIZE Merge, split, rotate, reorder pages. Compress to shrink a 10 MB PDF down to ~1 MB before sharing. Lock with a password. Add page numbers (1, 1/12, or Page 1 of 12 styles) and watermarks for confidential drafts. ■ FORMS Detect and fill PDF form fields automatically. Save filled copies without flattening so you can edit later. ■ DESIGNED FOR iOS Built entirely with SwiftUI for iOS 17 and above. Clean light theme, smooth gradient animations, haptic feedback, dynamic type and accessibility support. Files surface in the iOS Files app — no walled garden. ■ PRIVACY FIRST — NO DATA COLLECTED Every conversion, scan and OCR pass runs on your device. No cloud uploads, no analytics, no tracking, no third-party processing. Crimson Pdf makes zero network requests for its core functionality. ■ MULTI-LANGUAGE Available in 17 languages: English, Vietnamese, Spanish, French, German, Portuguese (Brazilian & European), Arabic, Hindi, Bengali, Indonesian, Japanese, Korean, Russian, Turkish, Chinese (Simplified & Traditional). Crimson Pdf is completely free. Every tool is unlocked from day one — no ads, no subscriptions, no in-app purchases.

Screenshots

LocalClock2 screens
Crimson Pdf4 screens

Verdict

The call

The clearest difference is device support: LocalClock at 3 against Crimson Pdf's 1. LocalClock also leads on iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences · 7 level
LocalClock versus Crimson Pdf: the parameters behind the verdict, then further details
ParameterLocalClockCrimson Pdf
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 months—
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size0 MB5 MB
Age rating4+4+
DeveloperBin HuaNguyen Trong Nhan

In-app purchases

None

LocalClock

No in-app purchases

None

Crimson Pdf

No in-app purchases

Questions

Is LocalClock free?
LocalClock is free to download, with no in-app purchases.
Is Crimson Pdf free?
Crimson Pdf is free to download, with no in-app purchases.
Do LocalClock or Crimson Pdf have ads?
Neither LocalClock nor Crimson Pdf shows ads.

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