Comparison

Nitro PDF Pro vs WriteTone

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

Head to head
About

Nitro PDF Pro

Edit, read, sign, and secure PDF documents on your iOS device. This powerful yet lightweight app allows for on-the-go productivity with features like text editing, annotation, form filling, and cloud syncing.

Highlights
  • Edit PDF text
  • Annotate and highlight PDFs
  • Fill and save PDF forms
  • Sign and share PDF documents
  • Password protect PDFs
  • Sync with cloud storage
  • Merge and organize PDFs
Features
Read full description

Ready to do more with PDFs on iPad & iPhone? Edit, read, sign and sync PDFs in the cloud with the powerful, lightweight Nitro PDF Pro app designed for iPad & iPhone users. Packed with features to help you stay productive on the go, Nitro PDF Pro for iPad & iPhone lets you edit, sign, share and manage your documents wherever you are - all in a secure and user-friendly interface. Get started for free with a 14-day trial today. “Superior PDF handling, & economical” “Nitro PDF Pro has become an essential tool in my daily business operations! It makes everything from document preparation to communication much easier for me.” “If you are looking for a workhorse app to handle your PDFs made by responsive developers, look no further...” -> With Nitro PDF Pro you can: EDIT PDFs ON THE GO * Easily edit PDF text wherever you are, on any iOS device * Make notes and add comments to PDFs for quick, on-the-go reference * Add images or mark-up PDFs with drawings, with stylus support for iPad ANNOTATE & HIGHLIGHT PDFs * Add annotations to PDF text and documents * Highlight text to stay organized and keep track of important information FILL & SAVE PDF FORMS * Fill and save PDF forms for fast & easy productivity * Keep your PDF forms secure with password protection SIGN & SHARE PDF DOCUMENTS * Sign & share PDF documents in a snap * Save text, signatures and images in your Library for easy re-use * Keep documents synced with the cloud for on-the-go signatures PROTECT, SECURE & SYNC PDFs * Password protect PDFs to keep your data and confidential information secure * Set the level of document encryption as required * Sync with the cloud to back up PDFs on iCloud, Dropbox, Google Drive, or Microsoft OneNote MERGE, EXPORT & ORGANIZE PDFs * Merge multiple documents into one PDF in just a few clicks for easy organization * Import, export & organize PDFs in folders for fast access and easy on-the-go editing * Duplicate, add, delete or rearrange pages for simple, custom document creation ADDITIONAL AMAZING PDF EDITOR FEATURES * Duplicate, add, delete, rotate and rearrange pages * Enable easier PDF reading with dark mode, search and zoom * Email & Airdrop your documents, with PDF flattening for maximum compatibility * View two documents simultaneously with multiple windows (iPadOS) * Bluetooth pressure-sensitive stylus support - automatically works with Apple Pencil * Support for Adonit Jot Touch and Jot Script styluses Still exploring PDF editors for iOS? No pressure! Give Nitro PDF Pro iOS a try for free with a 14-day trial and see how you like its features and functions. We think you’ll love the value we pack into our easy-to-use PDF iOS app. Questions and issues regarding our PDF app? We're here to help! Connect with Nitro through our Community Forum: https://community.gonitro.com/ NITRO POLICY https://www.gonitro.com/legal/privacy-policy https://www.gonitro.com/legal/terms-of-service

About

WriteTone

Features
Read full description

WriteTone transforms any text to sound exactly like you — your voice, your energy, your style. Just paste any rough draft, email, or brain dump and WriteTone rewrites it in your unique voice for any platform: Instagram, TikTok, YouTube, X, LinkedIn, Email, and more. HOW IT WORKS • Set up your Voice Profile — WriteTone analyzes your real posts to build your voice fingerprint • Paste any text into the input box • Choose your destination platform and format • Hit TRANSFORM — your rewritten text is instantly copied to clipboard FEATURES • Deep Voice Analysis — reads your actual social media posts, not just your bio • 9 platforms: Instagram, TikTok, YouTube, X, LinkedIn, Email, Text, Facebook, General • Tone modifiers: More Casual, More Hype, Shorter, Add Emojis, Stronger Hook, and more • Signature Phrases — optionally weave your catchphrases into any output • Voice Boost — paste your own posts when your profile is private • History — last 20 rewrites saved automatically • No API key needed — fully managed server-side WriteTone. Make it sound like you.

Screenshots

Nitro PDF Pro4 screens
WriteTone4 screens

Verdict

The call

The clearest difference is price: Nitro PDF Pro at Free against WriteTone's $0.99. Nitro PDF Pro also leads on iOS requirement (18.0 vs 26.2). WriteTone's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs every 2 months). On ads 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

Nitro PDF Pro is free to download; WriteTone costs $0.99 up front. Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year. WriteTone asks for nothing beyond the download.

UpkeepUpdate frequency

Nitro PDF Pro ships an update every 2 months, WriteTone fortnightly. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.

Scorecard4 real differences · 6 level
Nitro PDF Pro versus WriteTone: the parameters behind the verdict, then further details
ParameterNitro PDF ProWriteTone
PriceFree — better$0.99
Rating3.9 (161 ratings) — better—
Positive reviews12.5% of reviews—
Number of ratings161 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.0 — better26.2
Further details — not scored
Size59 MB23 MB
Age rating4+4+
DeveloperNitro Software, Inc.Trevor Lawrence

Bugs and requests

Nitro PDF Pro

Reported bugs

19 issues
  • Cannot reorder PDF files
  • Crashes when opening PDFs from websites/email
  • Does not save markups or documents
  • Difficulty creating new folders
  • Cannot rotate pages
Show 14 more
  • Cannot markup/draw on PDFs with editing disabled
  • Does not save documents after editing
  • Cannot rotate PDFs
  • Program freezes up
  • Fails to save after deleting pages
  • App crashes after update
  • Editing is lost prior to crash
  • Crashes every time to edit a PDF
  • Cannot handle deleting pages
  • Crashes when opening fillable PDFs
  • Crashes when typing in fields
  • No Apple Pencil support
  • Stylus link gives 404 error
  • Bugs like suddenly not being able to draw

Requested features

10 requests
  • Keyboard support (Cmd + F for search)
  • Ability to cancel search with Esc
  • OCR and conversion to text documents on tablets
  • User manual for iPad app
  • Support for Apple Pencil
Show 5 more
  • Ability to create table of contents
  • Ability to create fillable forms
  • Ability to rearrange pages
  • Ability to add to library
  • More intuitive interface

WriteTone

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Nitro PDF Pro

Subscriptions1
  • Annual Subscription14 Days trial$19.991 Year
One-time1
  • Nitro PDF Pro for iOS$9.99
None

WriteTone

No in-app purchases

Questions

Is Nitro PDF Pro free?
Nitro PDF Pro is free to download, with in-app purchases available.
Is WriteTone free?
WriteTone costs $0.99, with no in-app purchases.
Do Nitro PDF Pro or WriteTone have ads?
Neither Nitro PDF Pro nor WriteTone shows ads.
Which is updated more often, Nitro PDF Pro or WriteTone?
Nitro PDF Pro ships an update every 2 months, and WriteTone fortnightly. Most recently, Nitro PDF Pro was updated on October 14, 2026 and WriteTone on October 4, 2026.

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