Comparison

Adonit One vs Nitro PDF Pro

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

Head to head
About

Adonit One

This app offers a comprehensive space for recording and organizing various types of information. It features real-time audio and video transcription, multi-language translation, and digital note-taking with PDF signing capabilities. AI-powered tools help generate summaries and organize key points, making it a versatile mobile assistant for capturing and managing ideas.

Highlights
  • Real-time audio transcription
  • Video recording with transcription
  • Multi-language translation
  • Digital note-taking and sketching
  • PDF document signing
  • AI-powered smart generation
Features
Read full description

Adonit One provides the optimal space to store various records, presenting all details comprehensively. It synchronizes audio and video recordings with text conversion and organizes key points using the latest AI smart generation technology. Additionally, it offers multi-language translation and document sharing capabilities. With features for digital note-taking and PDF document signing, there are no usage restrictions, allowing you to freely organize all your records! [ Live Recording ] Adonit’s improved ASR(Automatic Speech Recognition) allows you to record and convert your audio to text in real-time with a 95% accuracy rate. With a click of a button, the Adonit articial intelligence is able to translate the recorded speech into different languages, aloowing you to edit, save, and share your recorded notes. [ Multiple Languages ] Support various languages including English, Traditional Chinese, Spanish, Japanese, German, Thai, Vietnamese, and French. [ You Capture, We Caption. ] Video-record your surrounsings with Adonit AI Vocal to revist the moments. What’s more? Get a video transcript that can be edited and translated into multiple languages. Share your learnings, meetings, proposals effortlessly. [ Keep your note handy and organized ] Aside from text recording, the built-in intuitive notetaking functions enable you to handwrite, sketch, upload images into your notes, and share them with others. [ Annotate your idea anywhere ] Adonit One also provides a PDF file signature function to help you quickly sign off any documents on-the-go. Transcribe live recording to help you note down all the important information with the correct punctuations and paragraph separations. Suitable to use for business meetings, negotiations, learning/training, news interviews, and whenever you need to jot down quick notes. Adonit One App will become your best mobile assistant. Work smarter and manage all digital documents quicker from anywhere at any time.

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

Screenshots

Adonit One4 screens
Nitro PDF Pro4 screens

Verdict

The call

The clearest difference is rating: Nitro PDF Pro at 3.9 against Adonit One's 2.7. Nitro PDF Pro also leads on ratings volume (161 vs 9). Adonit One's advantage is review sentiment (47% vs 13%) and update cadence (fortnightly vs every 2 months). On price, ads, in-app purchases and monetization model 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. Adonit One sells 4 in-app purchases, starting at $5.99 per month and Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Nitro PDF Pro holds the better App Store score, 3.9 against 2.7. That said, the two scores are not equally well evidenced: Nitro PDF Pro has 161 ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 47% of Adonit One's written reviews are positive against 13% of Nitro PDF Pro's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Adonit One ships an update fortnightly, Nitro PDF Pro every 2 months. The most recent releases landed on October 15, 2026 and October 27, 2026 respectively.

Scorecard5 real differences · 5 level
Adonit One versus Nitro PDF Pro: the parameters behind the verdict, then further details
ParameterAdonit OneNitro PDF Pro
PriceFreeFree
Rating2.7 (9 ratings)3.9 (161 ratings) — better
Positive reviews46.7% of reviews — better12.5% of reviews
Number of ratings9161 — better
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.4 — better18.0
Further details — not scored
Size225 MB59 MB
Age rating17+4+
DeveloperAdonit Corp.Nitro Software, Inc.

Customer experience

Adonit One

All ratings9 ratings
Positive44.4%
Neutral0.0%
Negative55.6%
Written reviews15 reviews
Positive46.7%
Neutral0.0%
Negative53.3%

Nitro PDF Pro

All ratings157 ratings
Positive70.1%
Neutral5.1%
Negative24.8%
Written reviews64 reviews
Positive12.5%
Neutral6.3%
Negative81.3%

Bugs and requests

Adonit One

Not enough reviews yet to summarise bugs or 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

In-app purchases

4 purchases

Adonit One

Subscriptions2
  • Adonit Silver$5.991 Month
  • Adonit Gold$7.991 Month
One-time2
  • Audio/Video-to-text 75 minutes$4.99
  • Translation 100,000 words$4.99
2 purchases

Nitro PDF Pro

Subscriptions1
  • Annual Subscription14 Days trial$19.991 Year
One-time1
  • Nitro PDF Pro for iOS$9.99

Questions

Is Adonit One free?
Adonit One is free to download, with in-app purchases available.
Is Nitro PDF Pro free?
Nitro PDF Pro is free to download, with in-app purchases available.
Which has better reviews, Adonit One or Nitro PDF Pro?
Nitro PDF Pro is rated higher. Adonit One averages 2.7 out of 5 from 9 ratings, while Nitro PDF Pro averages 3.9 from 161 ratings.
Do Adonit One or Nitro PDF Pro have ads?
Neither Adonit One nor Nitro PDF Pro shows ads.
Which is updated more often, Adonit One or Nitro PDF Pro?
Adonit One ships an update fortnightly, and Nitro PDF Pro every 2 months. Most recently, Adonit One was updated on October 15, 2026 and Nitro PDF Pro on October 27, 2026.

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