Comparison

Nitro PDF Pro vs Elephas

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

Elephas

Transform your documents, notes, and research into a conversational AI knowledge base. Ask questions and get instant answers with source citations, organize information into separate project brains, and sync across devices. Enhance your writing with an AI keyboard.

Highlights
  • Chat with files, docs, and notes
  • Instant answers with source citations
  • Multiple knowledge brains for projects
  • Seamless Mac and iPhone sync
  • AI writing keyboard for iOS
  • Supports 20+ file formats
  • Semantic search and knowledge graph
Features
Read full description

AI IS POWERFUL. UNTIL YOUR WORK BECOMES SENSITIVE. Most AI tools work well for general use. But when it comes to client documents, internal notes, research, or confidential data, things change. Elephas lets you use AI on your files without exposing sensitive information. With local-first processing, smart redaction, and flexible AI modes, you can work with your knowledge safely while still getting powerful results. BUILT FOR SENSITIVE WORK Elephas is designed for professionals who deal with important information every day. • Automatically redacts sensitive data before AI processing • Keeps your knowledge local whenever possible • Use offline AI or protected cloud models • Choose how your data is handled based on your needs Use AI confidently, even with documents you would normally avoid sharing. CHAT WITH YOUR FILES Turn your documents into something you can actually talk to. • Ask questions and get instant answers with sources • Works across PDFs, notes, documents, and more • Understands context, not just keywords • Find insights across your entire knowledge base Example questions: • What were the risks mentioned in this report • Summarize these documents for my meeting • Find everything related to pricing strategy Your knowledge becomes easy to search and use. WORK YOUR WAY Elephas adapts to how you work. • Choose between local AI or cloud AI with redaction • Organize information into separate knowledge spaces • Keep personal, work, and client data separate • Everything is indexed automatically You decide how AI works for you. MAC AND IPHONE, IN SYNC Start on Mac and continue on iPhone. • Access your knowledge anywhere • Sync documents, notes, and conversations • Capture ideas on the go and use them later Your AI workspace stays with you. OPTIONAL AI WRITING KEYBOARD Use Elephas across any app on iOS. • Draft emails, messages, and reports faster • Rewrite in different tones • Fix grammar and improve clarity Works in Mail, Messages, WhatsApp, Slack, and more. BUILT FOR REAL WORK Elephas is used by people who rely on their information. • Consultants and business professionals • Lawyers and analysts • Researchers and academics • Founders and operators If your work depends on knowledge, Elephas helps you move faster without taking risks. POWERFUL CAPABILITIES • Chat with PDFs, documents, notes, and research • Source citations for every answer • Summaries and insights from your own data • Save web content and build your knowledge base • Voice notes with transcription • Works with modern AI models like OpenAI, Claude, and Gemini YOUR DATA, HANDLED RESPONSIBLY • Sensitive data is redacted before AI processing • You control when cloud AI is used • Use zero-retention open source cloud models • Your data is not used to train models Built for trust and real work. TRY ELEPHAS FREE Start your 7-day free trial and experience a safer way to use AI with your knowledge. Work smarter. Stay organized. Use AI where it actually matters. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://elephas.app/privacy-ios This app can use APIs from OpenAI, Google and Anthropic. Elephas is not affiliated with or endorsed by these providers.

Screenshots

Nitro PDF Pro4 screens
Elephas4 screens

Verdict

The call

The clearest difference is rating: Nitro PDF Pro at 3.9 against Elephas's 2.4. Nitro PDF Pro also leads on ratings volume (161 vs 13). Elephas's advantage is review sentiment (26% vs 13%) and update cadence (every 5 weeks 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. Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year and Elephas sells 6 in-app purchases, starting at $6.99 per month. 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 2.4. That said, the two scores are not equally well evidenced: Nitro PDF Pro has 161 ratings behind it against 13, so its average is the more settled of the two. Written reviews complicate that: 13% of Nitro PDF Pro's written reviews are positive against 26% of Elephas's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Nitro PDF Pro ships an update every 2 months, Elephas every 5 weeks. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Nitro PDF Pro versus Elephas: the parameters behind the verdict, then further details
ParameterNitro PDF ProElephas
PriceFreeFree
Rating3.9 (161 ratings) — better2.4 (13 ratings)
Positive reviews12.5% of reviews26.5% of reviews — better
Number of ratings161 — better13
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size59 MB68 MB
Age rating4+17+
DeveloperNitro Software, Inc.Selvam S

Customer experience

Nitro PDF Pro

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

Elephas

All ratings12 ratings
Positive25.0%
Neutral25.0%
Negative50.0%
Written reviews34 reviews
Positive26.5%
Neutral20.6%
Negative52.9%

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

Elephas

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
6 purchases

Elephas

Subscriptions6
  • Standard Monthly7 Days trial$6.991 Month
  • Pro Monthly7 Days trial$19.991 Month
  • Pro Plus Monthly7 Days trial$29.991 Month
Show 3 more
  • Standard Yearly7 Days trial$69.991 Year
  • Pro Yearly7 Days trial$199.991 Year
  • Pro Plus Yearly7 Days trial$299.991 Year

Questions

Is Nitro PDF Pro free?
Nitro PDF Pro is free to download, with in-app purchases available.
Is Elephas free?
Elephas is free to download, with in-app purchases available.
Which has better reviews, Nitro PDF Pro or Elephas?
Nitro PDF Pro is rated higher. Nitro PDF Pro averages 3.9 out of 5 from 161 ratings, while Elephas averages 2.4 from 13 ratings.
Do Nitro PDF Pro or Elephas have ads?
Neither Nitro PDF Pro nor Elephas shows ads.
Which is updated more often, Nitro PDF Pro or Elephas?
Nitro PDF Pro ships an update every 2 months, and Elephas every 5 weeks. Most recently, Nitro PDF Pro was updated on October 27, 2026 and Elephas on October 24, 2026.

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