Comparison

Allume 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

Allume

This app provides a digital canvas for organizing thoughts and ideas. It allows users to create nested boards, link content, and combine various media types like text, images, and PDFs. Collaborate with others in real-time on shared workspaces.

Highlights
  • Nested boards for deep ideation
  • Linked cards for referencing
  • Remixing content from PDFs and images
  • Unified canvas for text, ink, and files
  • Real-time collaboration with shared workspaces
  • PDF annotation and export
Features
Read full description

Allume (formerly Muse) is a canvas for thinking that helps you get clarity on things that matter. Think in private or collaborate with others. BEYOND WHITEBOARDS with nested boards Each Muse board is like a whiteboard that can hold even more whiteboards. Your boards grow organically over time as you develop an idea. Stay in the ideation flow, worry about organizing later. REFERENCE & REMIX with linked cards & excerpts Linked cards let you reference boards from multiple places. And excerpts let you remix parts of PDFs and images without losing the context of the source. Grow your Muse into a space of interconnected whiteboards. ONE CANVAS FOR ANYTHING with ink + text + cards Developing an idea starts with collecting inspiration and stray thoughts. Muse lets you put everything on a single canvas: writing, scribbles, notes, images, videos, PDFs, web links, and any other files. Lay out all the raw materials, then connect the dots with ease. COLLABORATION with shared workspaces Add collaborators to a Muse workspace to plan and strategize together. They'll feel right at home with live cursors, comments, following, and templates. AND PLENTY MORE → Search and quick-jump to boards → Read and annotate PDFs → Create connections between cards → Export boards as PDFs or PNGs → Local-first data with instant sync LEARN MORE Website: https://allume.com/ Community: https://allume.com/community Contact us: hello@allume.com Terms of service: https://allume.com/terms

About

Nitro PDF Pro

Edit, annotate, and secure PDF documents on the go. This app offers powerful tools for professionals to manage PDFs, including mobile scanning and AI-powered data extraction. Seamlessly integrate with cloud services and use styluses for precise markups.

Highlights
  • Edit and annotate PDFs with precision tools
  • Organize pages, merge, and extract PDFs
  • Mobile scanning with OCR for searchable PDFs
  • Secure documents with password protection
  • AI-powered data extraction from tables
  • Seamless integration with cloud storage
Features
Read full description

Nitro PDF Pro is the modern PDF solution with everything you need to edit, annotate, manage, and secure documents on the go. Built for professionals who need powerful PDF tools anywhere, anytime. Create, edit, and manage PDFs seamlessly across iPhone and iPad. Nitro PDF Pro integrates with Apple's Files app and your favorite cloud services—iCloud Drive, OneDrive, Box, Dropbox, Google Drive and more—so your documents are always within reach. Work with Apple Pencil or Bluetooth styluses for freehand drawing, writing, and annotating, and use mobile scanning to turn receipts and documents into PDFs. GET MORE DONE WITH NITRO'S POWERFUL PDF FEATURES EDIT AND ANNOTATE Highlight, underline, draw, add text, and leave comments on any PDF with precision tools designed for touch and Apple Pencil. • Edit text and images with full-page paragraph reflow • Add sticky notes, text edits, and freehand drawings • Highlight and underline key passages • Mark documents with stamps such as Approved or Draft PAGE MANAGEMENT Organize your documents your way. • Add, delete, reorder, and rotate pages • Extract specific pages into a new document • Merge multiple PDFs and documents into a single file MOBILE SCANNING Turn paper into searchable PDFs instantly. • Scan documents, receipts, and business cards directly on your device • Automatic edge detection and perspective correction • Turn scanned documents into searchable, editable PDFs with OCR • Batch scan multiple pages in one session SECURE AND PROTECT Keep every document, and everything inside it, safe with password protection, encryption, and permission controls. • Password-protect files and restrict copying or editing • Permanently redact sensitive information AI-POWERED PRODUCTIVITY Get AI tools built for privacy and control, so you can boost productivity without compromising security. • Automatically extract structured data from tables and forms SEAMLESS INTEGRATION Work where you work, with the tools you trust. • Open PDFs directly from the Files app, OneDrive, and SharePoint • Share via AirDrop, Mail, or third-party apps • Access your documents across iPad and iPhone with iCloud sync Try Nitro PDF Pro for free with a 14-day trial and see why it's the PDF editor for professionals who need to create, edit, and collaborate on PDFs with confidence—from the office to anywhere. Questions about Nitro PDF Pro? User Guides give you step-by-step instructions for editing, annotating, scanning, securing, and managing documents. Get instant support via our in-app Knowledge Assistant or connect directly with our expert team.

Screenshots

Allume3 screens
Nitro PDF Pro4 screens

Verdict

The call

The clearest difference is review sentiment: Allume at 64% against Nitro PDF Pro's 12%. Allume also leads on rating (4.6 vs 3.9) and update cadence (every 2 weeks vs every 2 months). On price, ratings volume, 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. Allume sells 4 in-app purchases, starting at $9.99 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

Allume holds the better App Store score, 4.6 against 3.9. Both are backed by a comparable volume of ratings — 338 and 161 respectively. Written reviews point the same way: 64% of Allume's written reviews are positive against 12% of Nitro PDF Pro's.

UpkeepUpdate frequency

Allume ships an update every 2 weeks, Nitro PDF Pro every 2 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

Scorecard5 real differences · 5 level
Allume versus Nitro PDF Pro: the parameters behind the verdict, then further details
ParameterAllumeNitro PDF Pro
PriceFreeFree
Rating4.6 (338 ratings) — better3.9 (161 ratings)
Positive reviews64.4% of reviews — better12.3% of reviews
Number of ratings338 — better161
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better26.0
Further details — not scored
Size100 MB63 MB
Age rating4+4+
DeveloperMilestone Made, LLCNitro Software, Inc.

Customer experience

Allume

All ratings332 ratings
Positive91.0%
Neutral2.7%
Negative6.3%
Written reviews267 reviews
Positive64.4%
Neutral10.1%
Negative25.5%

Nitro PDF Pro

All ratings161 ratings
Positive70.2%
Neutral5.0%
Negative24.8%
Written reviews65 reviews
Positive12.3%
Neutral6.2%
Negative81.5%

User reviews

Allume

From 338 App Store ratings

What we love

  • 👍 Organize ideas and information
  • 🚀 Unique and very cool features
  • 👍 Indispensable app - incredibly well designed
  • 👍 Great thinking and creative tool
  • 👍 Exceptional app

Room to improve

  • 💰 Too expensive subscription price
  • 🔒 Lack of privacy of user data
  • 🔒 Requires email to try
  • 🐛 Bugs are prevalent
  • 🔒 Outrageous pricing

Nitro PDF Pro

From 161 App Store ratings

What we love

  • 👍 Helpful for managing project documents
  • 👍 Convenient for PDF modifications
  • 👍 Superior PDF handling on Mac
  • 👍 Satisfactory in both Mac and Windows environments

Room to improve

  • 👎 Pro features not available on iOS/iPadOS
  • 👎 Yearly charges for basic features
  • 👎 Expensive and useless
  • 👎 Fails to deliver promised features
  • 👎 Impossible to reorder PDF files

Bugs and requests

Allume

Reported bugs

6 issues
  • Eraser size issues
  • Undo history reset when navigating between boards
  • Crashes when erasing large areas
  • Syncing issues between devices
  • iPhone app not usable without iPad or Mac
Show 1 more
  • Freezing and performance issues

Requested features

7 requests
  • More pen color and workspace options
  • Zoom in/out within a board
  • Search functionality
  • Checklists
  • Support for pen tablets on Mac
Show 2 more
  • Straight line drawing with arrowheads
  • Monthly payment plan

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

Allume

Subscriptions4
  • Unlimited membership, monthly$9.991 Month
  • Pro membership, monthly$9.991 Month
  • Unlimited membership, yearly$99.991 Year
Show 1 more
  • Pro membership, yearly$99.991 Year
2 purchases

Nitro PDF Pro

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

Questions

Is Allume free?
Allume 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, Allume or Nitro PDF Pro?
Allume is rated higher. Allume averages 4.6 out of 5 from 338 ratings, while Nitro PDF Pro averages 3.9 from 161 ratings.
Do Allume or Nitro PDF Pro have ads?
Neither Allume nor Nitro PDF Pro shows ads.
Which is updated more often, Allume or Nitro PDF Pro?
Allume ships an update every 2 weeks, and Nitro PDF Pro every 2 months. Most recently, Allume was updated on October 23, 2026 and Nitro PDF Pro on October 30, 2026.

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