Comparison

PDF Reader vs Interchange

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

Head to head
About

PDF Reader

This app allows you to read various document formats like PDF, EPUB, and CHM on your iPhone and iPad. It supports file import, text search, annotation, and even previewing MS Office files and videos. A simple to-do list and auto-save reading progress are also included.

Highlights
  • Reads PDF, CHM, EPUB, TXT files
  • PDF annotation and text search
  • File import via Files, Airdrop, iTunes, web
  • MS Office and video file preview
  • Simple To-Do list functionality
  • Auto-save reading progress
Features
Read full description

PDF Reader - Mini Version is an amazing reader App on iPhone and iPad Main Fatures: 1. support read pdf、chm、epub、txt file 2. support pdf annotation and text search 3. support import file via Files、Airdrop、iTunes、web browser 4. support MS office Word、Excel、PPT、Video and many other file types preview 5. support simple Todo list 6. support auto save reading progress 7. support Baidu Net Disk

About

Interchange

Convert and read a wide variety of ebook formats, including DRM-protected files. Offers extensive customization for reading, note-taking, and book management. Supports multiple import methods and file decompression.

Highlights
  • Multiple ebook format conversion
  • DRM removal for Kindle books
  • Customizable ebook reader layout
  • Note-taking and bookmarking
  • Customizable book covers
  • Multiple page-turning methods
  • Comic reading support
  • Advanced book management
Features
Read full description

Functional Features 1. Supports multiple format conversions: txt, epub, mobi, azw, azw3, prc, pdf, markdown, docx, htmlz, fb2, etc. For txt files, automatically extract chapter directories. 2. Support removing DRM protected book files (Kindle DRM). 3. A comprehensive e-book reader that supports multiple formats: txt epub、mobi、azw、azw3、prc、pdf。 Powerful custom layout layout, including line spacing, paragraph spacing, first line indentation, top and bottom spacing, left and right spacing, custom background, custom font, global progress drag, and global search. Rich note taking and bookmarking functions. 4. Support custom book covers, online search, and album selection, even txt can have beautiful covers. Simultaneously editable, cropped, and filtered. 5. Provide multiple page turning methods, including overlay, translation, simulation, scrolling, automatic scrolling reading, landscape reading, and dual column reading. 6. Supports comic reading, with maximum screen ratio and maximum clarity for reading comics. Support scrolling mode for reading comics. 7. Powerful book management function, supporting grouping, renaming, sorting, dragging and merging groups, batch deletion, and moving operations. 8. Support modifying book element data such as title, author, ASIN, ISBN, time, publisher, etc. 9. Multiple file transfer methods, importing book files through WiFi, computer, Baidu cloud storage, local devices, and other application sharing methods for convenience and ease. 10. Quickly decompress compressed files such as zip, rar, 7z, etc. 11. Password protection function, can set gesture password, facial recognition unlock. 12. There are more features waiting for you to explore. [Automatic Subscription Instructions] --Subscription period: 1 month --Price: ¥ 18 --Subscription auto renewal, unless auto renewal is closed at least 24 hours before the end of the current term. --Payment will be charged to iTunes account upon confirmation of purchase --The account will receive renewal fees within 24 hours before the end of the current period, and the renewal fees will be determined --Subscription can be managed by users themselves, and automatic subscription can be disabled by entering their personal account on the App Store after purchase --If any unused portion of the free trial period is provided, it will be forfeited upon the user's purchase of the publication's subscription (if applicable) --Subscription period: 1 year --Price: ¥ 30 --Subscription auto renewal, unless auto renewal is closed at least 24 hours before the end of the current term --Payment will be charged to iTunes account upon confirmation of purchase --The account will receive renewal fees within 24 hours before the end of the current period, and the renewal fees will be determined --Subscription can be managed by users themselves, and automatic subscription can be disabled by entering their personal account on the App Store after purchase --If any unused portion of the free trial period is provided, it will be forfeited upon the user's purchase of the publication's subscription (if applicable) --Service Terms: http://blog.sina.com.cn/s/blog_a02518890102xuoh.html --Privacy Policy: http://blog.sina.com.cn/s/blog_a02518890102xtq4.html

Screenshots

PDF Reader3 screens
Interchange4 screens

Verdict

The call

The clearest difference is rating: PDF Reader at 4.9 against Interchange's 4.3. PDF Reader also leads on monetization model (free with in-app purchases vs subscription). Interchange's advantage is update cadence (every 6 days vs every 3 weeks) and ratings volume (212 vs 8). On price, review sentiment, 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. PDF Reader sells 5 one-off in-app purchases and Interchange sells 9 in-app purchases, starting at $2.49 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

PDF Reader holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Interchange has 212 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 71% of PDF Reader's written reviews are positive against 73% of Interchange's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

PDF Reader ships an update every 3 weeks, Interchange every 6 days. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

Scorecard4 real differences · 6 level
PDF Reader versus Interchange: the parameters behind the verdict, then further details
ParameterPDF ReaderInterchange
PriceFreeFree
Rating4.9 (8 ratings) — better4.3 (212 ratings)
Positive reviews71.4% of reviews73.2% of reviews — better
Number of ratings8212 — better
Update frequencyEvery 3 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better12.2
Further details — not scored
Size50 MB103 MB
Age rating4+17+
Developer绪强 任小龙 刘

Customer experience

PDF Reader

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews28 reviews
Positive71.4%
Neutral17.9%
Negative10.7%

Interchange

All ratings212 ratings
Positive83.0%
Neutral2.4%
Negative14.6%
Written reviews112 reviews
Positive73.2%
Neutral3.6%
Negative23.2%

Bugs and requests

PDF Reader

Not enough reviews yet to summarise bugs or requests.

Interchange

Reported bugs

11 issues
  • App crashes when changing covers
  • Ad close buttons are too small or non-functional
  • Converted files show as 0 bytes
  • App crashes when deleting empty files
  • Pro version features still require upgrade prompts
Show 6 more
  • Converted PDFs have missing images and jumbled text
  • Files vanish after sending to Kindle
  • Conversion fails despite payment
  • App shows ads instead of converting files
  • Cover metadata not preserved in conversions
  • Right-to-left text displays incorrectly

Requested features

8 requests
  • Batch conversion capability
  • Right-to-left text support for Arabic books
  • Proper cover image inclusion in conversions
  • Unlimited conversions
  • iPad Pro landscape orientation support
Show 3 more
  • Ability to send files to Kindle over WiFi
  • Bookmark synchronization across devices
  • Better ad implementation with working close buttons

In-app purchases

5 purchases

PDF Reader

One-time5
  • Reader App donate$0.99
  • Dropbox Support$0.99
  • Remove Ad$4.99
Show 2 more
  • Todo donate$7.99
  • Todo donate$14.99
9 purchases

Interchange

Subscriptions2
  • UNLOCK ALL FEATURES, REMOVE AD$2.491 Month
  • UNLOCK ALL FEATURES, REMOVE AD$4.991 Year
One-time7
  • REMOVE ALL ADS$1.99
  • Conversions+50$1.99
  • All formats2 variants$1.99
Show 4 more
  • Conversions+600$2.99
  • Conversions+1000$3.99
  • ALL ACCESS, REMOVING AD$9.99
  • All advanced features$9.99

Questions

Is PDF Reader free?
PDF Reader is free to download, with in-app purchases available.
Is Interchange free?
Interchange is free to download, with in-app purchases available.
Which has better reviews, PDF Reader or Interchange?
PDF Reader is rated higher. PDF Reader averages 4.9 out of 5 from 8 ratings, while Interchange averages 4.3 from 212 ratings.
Do PDF Reader or Interchange have ads?
Neither PDF Reader nor Interchange shows ads.
Which is updated more often, PDF Reader or Interchange?
PDF Reader ships an update every 3 weeks, and Interchange every 6 days. Most recently, PDF Reader was updated on October 8, 2026 and Interchange on October 11, 2026.

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