Comparison

PDF Conversion vs SereneDiary

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

Head to head
About

PDF Conversion

Features
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PDF Conversion: One-stop PDF Conversion Artifact In the era of digital office and learning, the conversion of file format often becomes a problem that puzzles us. But now, with this powerful PDF conversion app, everything will become easy and convenient! It supports a wide variety of conversion capabilities to meet your needs in a variety of scenarios: * PDF to Word: allows you to easily edit and modify the text content in PDF, retain the original format and layout, and improve work efficiency. * PDF to Excel: Quickly convert table data in PDF into editable Excel tables to facilitate data processing and analysis. * PDF to PowerPoint: Convert PDF documents into beautiful presentations, saving time for remaking. * PDF to picture: PDF pages can be extracted into high-quality pictures, easy to share and display on different platforms. It also supports reverse conversion: * Word to PDF: Ensure that your Word document is stable in format and not easy to be tampered with when sharing and saving. * Excel to PDF: Make Excel tables present in standardized PDF format, which is more suitable for printing and circulation. * PowerPoint to PDF: Fixes presentations in PDF format for easy saving and sharing. * Picture to PDF: Quickly integrate multiple pictures into a PDF file for easy sorting and archiving. Whether you're a student, an office worker, or a professional, this PDF conversion app is your indispensable tool. It has simple operation, fast conversion speed and high quality, which brings great convenience to your work and study. Come and experience it! Automatic renewal rules] 1. We provide automatic renewal subscription services for 1 week, 1 month and 12 months. 2. Payment: The user confirms the purchase and charges it to the iTunes account after payment. 3. Renewal: Subscriptions that include free trials will automatically renew as paid subscriptions. Fees will be charged to your iTunes account within 24 hours prior to expiration, and the cost of renewal depends on your subscription plan. After the fee deduction is successful, the subscription cycle will be extended by one subscription cycle. 4. Cancel renewal: If you need to cancel the renewal, please manually turn off the automatic renewal function in iTunes / Apple ID setting management no less than 24 hours before the current subscription period expires, and no renewal fee will be charged. User Agreement: http://oss.lizhikeji.com/h5/pdfTool/user.html Privacy Policy: http://oss.lizhikeji.com/h5/pdfTool/privacy.html Subscription Agreement: http://oss.lizhikeji.com/h5/pdfTool/subscribe.html

About

SereneDiary

Features
Read full description

Core Features Journaling: Create and edit diary entries with titles and rich text content. Browse entries chronologically with an elegant card-based layout. Photo Diary: Attach up to 9 images per entry. Thumbnails displayed in a scrolling gallery — tap to view full-screen with pinch-to-zoom and swipe navigation. Smart Tags: Organize entries with custom tags (Work, Life, Inspiration, Health, Study). Filter by tag and date. Sort by newest or oldest. Privacy & Security Biometric Lock: Secure the app with Face ID or Touch ID. Auto-authenticates on launch to protect your private writings. 100% Local: All data stored on-device only. No network requests, no third-party tracking, no account required. Multi-Language Full support for English, įŽ€äŊ“中文, æ—ĨæœŦčĒž, 한ęĩ­ė–´. Data Management Export: Export entries as plain text files or JSON format via the system share sheet.

Screenshots

PDF Conversion3 screens
SereneDiary3 screens

Verdict

The call

The clearest difference is price: PDF Conversion at Free against SereneDiary's $0.99. SereneDiary's advantage is in-app purchases (none vs 4). On update cadence, 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

CostPrice ¡ In-app purchases ¡ Ads ¡ Monetization

PDF Conversion is free to download; SereneDiary costs $0.99 up front. PDF Conversion sells 4 in-app purchases, starting at $2.99 per 7 days. SereneDiary asks for nothing beyond the download.

UpkeepUpdate frequency

PDF Conversion ships an update every 3 weeks, SereneDiary every 6 weeks. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

Scorecard2 real differences ¡ 4 level
PDF Conversion versus SereneDiary: the parameters behind the verdict, then further details
ParameterPDF ConversionSereneDiary
PriceFree — better$0.99
Update frequencyEvery 3 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size5 MB1 MB
Age rating4+4+
DeveloperBeijing Litchi Fun Technology Co., Ltd.æ´ĒåĢ æŊ˜

In-app purchases

4 purchases

PDF Conversion

Subscriptions3
  • Weekly Subscription7 Days trial$2.997 Days
  • Monthly Subscription$4.991 Month
  • Annual Subscription$14.991 Year
One-time1
  • Lifetime Member$24.99
None

SereneDiary

No in-app purchases

Questions

Is PDF Conversion free?
PDF Conversion is free to download, with in-app purchases available.
Is SereneDiary free?
SereneDiary costs $0.99, with no in-app purchases.
Do PDF Conversion or SereneDiary have ads?
Neither PDF Conversion nor SereneDiary shows ads.
Which is updated more often, PDF Conversion or SereneDiary?
PDF Conversion ships an update every 3 weeks, and SereneDiary every 6 weeks. Most recently, PDF Conversion was updated on October 17, 2026 and SereneDiary on October 8, 2026.

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