Comparison

PDF Viewer by Nutrient vs Relyn

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

Head to head
About

PDF Viewer by Nutrient

Easily view, search, and annotate PDF documents on your iPhone and iPad. Import files from cloud services, fill out forms, add signatures, and organize your documents. Advanced features like redaction and combining documents are available with a Pro subscription.

Highlights
  • View and search PDFs
  • Annotate with highlights and notes
  • Sign documents digitally
  • Fill out PDF forms
  • Organize and share documents
  • Import from cloud services
Features
Read full description

PDF Viewer is a fast and beautiful app, allowing you to view, search, and annotate PDF documents with ease on your iPhone and iPad. Access your files from iCloud, Dropbox, Box, OneDrive, Google Drive or any other cloud solution via Apple's familiar Document Browser interface. +++ Listed as “Productivity lifesaver” on the App Store +++ "A streamlined interface packed with powerful features - it’s like having a desktop-quality PDF toolkit wherever we go" – App Store Editor Notes “I'm impressed by how the folks at PSPDFKit have been able to fine-tune the document browser to the app's needs.” – MacStories.net "If you want a PDF viewer that is designed for reading PDF books, this is it." – App Review VIEW DOCUMENTS ON THE GO • Easily import a PDF from your favorite cloud service provider, email, or directly off a website. • Supports Open In Place, Drag & Drop and features the familiar Apple Document Browser interface from the Files app. • Search for the exact text you are looking for within the document. • Double tap on the screen to Smart Zoom directly to the text you want to read. • Annotate images (JPEG, PNG) non-destructive, just like PDF documents. (PRO) ANNOTATE WITH EASE • While reviewing a document, use your finger or Apple Pencil to highlight and markup text. • Leave comments by adding a note, text, or drawing directly on the PDF. • Add images or audio. • Reply to notes. (PRO) SIGN DOCUMENTS ANYWHERE • Add your signature to any document using your finger or Apple Pencil. • Move and resize your signature as needed. • Flatten a document to ensure the signature doesn’t change. CREATE AND EDIT PDFs • Create new documents from existing documents by moving, rotating, deleting, or adding new pages. • Combine multiple documents into a single one. (PRO) • Add bookmarks to easily return to certain pages in large documents. FILL OUT FORMS • Quickly fill out PDF Forms by adding text to the fields. • Flatten and secure the form once you’re done to ensure the document doesn’t change. • Add a signature to any Form. STORE, ORGANIZE AND SHARE • Store documents, create folders and organize your documents. • Share documents by printing, emailing or saving your edits back any cloud service. PASSWORD PROTECT DOCUMENTS • Read document metadata, title and keywords. • Protect documents with user and owner passwords and limit permissions. (PRO) AND SO MUCH MORE • Conveniently switch to night mode when viewing your documents at night. • Present on external screens without the distraction of toolbars. (PRO) • Have the text from a PDF read out loud to you with text-to-speech. • PDF Viewer remembers where you were down to the page/position where you left off - even across devices. PRICING PDF Viewer comes with a large feature set, completely free. Some advanced features require the purchase of PDF Viewer Pro, available as a subscription. We offer 3-monthly and yearly subscription plans. There’s also a fully functional 7-day trial, so you can test PDF Viewer Pro (including document merging and password editing) before you commit. All plans unlock the app on iPhone and iPad. TRUSTED BY COMPANIES YOU KNOW PDF Viewer is built on top of and powered by PSPDFKit, the same PDF engine trusted around the world by companies like Dropbox, Box, IBM, Atlassian, SAP, and Lufthansa. BE PART OF THE PDF VIEWER COMMUNITY pdfviewer.io twitter.com/pdfviewerapp LEGAL Duration and price of each subscription are displayed in PDF Viewers’ storefront, updated at the time of purchase. Payment will be charged to iTunes account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off no later than 24 hours before the end of the current period. Subscriptions and auto-renewal can be managed/turned off in the iTunes account settings. Any unused portion of a free trial period is forfeited as soon as a subscription is purchased. Terms of Use: https://pdfviewer.io/terms Privacy Policy: https://pdfviewer.io/privacy

About

Relyn

This app helps you track commitments made to others, ensuring important promises aren't forgotten. It intelligently captures details like due dates and contacts, and organizes your tasks for follow-through. Syncs across devices and prioritizes relationships.

Highlights
  • Smart Capture for commitments
  • Follow-through focused task management
  • Recurring commitment scheduling
  • Waiting On tracking
  • Contact-centric commitment history
  • Siri integration
  • Home Screen widgets and Apple Watch support
Features
Read full description

Relyn is the commitment tracker for people who give their word and mean to keep it. Most to-do apps treat everything the same. Relyn is built around one idea: the tasks that matter most are the ones you promised someone else — a call you owe a customer, a follow-up you told your boss you'd send, a favor you told a friend you'd handle. Relyn keeps those front and center, so nothing you've committed to quietly slips away. CAPTURE IN SECONDS Speak or type a commitment in plain language — "call Jason tomorrow about pricing" — and Relyn's Smart Capture parses out the category, priority, due date, and contact automatically. Scan a business card to add a new contact on the spot. BUILT AROUND FOLLOW-THROUGH • Today view surfaces exactly what needs your attention now — nothing more • Recurring commitments (daily, weekly, biweekly, monthly) automatically reschedule themselves when completed • "Waiting On" tracking shows who owes you a response • Recent Wins keeps a quiet record of what you've already handled PEOPLE, NOT JUST TASKS Attach a contact to any commitment and Relyn keeps a running history of what you owe them and what they owe you — so relationships don't get lost in a flat list of to-dos. EVERYWHERE YOU ARE • Ask Siri to add a commitment hands-free • Check what's next from a Home Screen widget without opening the app • Glance at your upcoming commitments on Apple Watch • Everything syncs across your devices through your own iCloud account MAKE IT YOURS Choose your accent color and switch between light, dark, or system appearance. YOUR DATA STAYS YOURS Relyn makes no network calls of its own, shows no ads, and runs no analytics. Everything is stored on your device and, if you enable it, synced through your personal iCloud account — never through us. Relyn doesn't just help you manage tasks. It helps you keep your word.

Screenshots

PDF Viewer by Nutrient4 screens
Relyn4 screens

Verdict

The call

The clearest difference is in-app purchases: Relyn at none against PDF Viewer by Nutrient's 2. Relyn also leads on rating (5.0 vs 4.6) and update cadence (weekly vs monthly). PDF Viewer by Nutrient's advantage is ratings volume (9.1K vs 1) and iOS requirement (17.0 vs 26.4). On price, 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

Both are free to download. PDF Viewer by Nutrient sells 2 in-app purchases, starting at $6.99 per 3 months. Relyn asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Relyn holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: PDF Viewer by Nutrient has 9.1K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

PDF Viewer by Nutrient ships an update monthly, Relyn weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard6 real differences · 4 level
PDF Viewer by Nutrient versus Relyn: the parameters behind the verdict, then further details
ParameterPDF Viewer by NutrientRelyn
PriceFreeFree
Rating4.6 (9.1K ratings)5.0 (1 ratings) — better
Positive reviews73.2% of reviews—
Number of ratings9.1K — better1
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, Mac, Vision Pro — betteriPhone, iPad, Apple Watch
Requires iOS17.0 — better26.4
Further details — not scored
Size109 MB6 MB
Age rating4+4+
DeveloperPSPDFKit GmbHSTEVEN COFFEY

Customer experience

PDF Viewer by Nutrient

All ratings9,101 ratings
Positive90.8%
Neutral3.7%
Negative5.4%
Written reviews1,095 reviews
Positive73.2%
Neutral9.8%
Negative17.1%

Relyn

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

PDF Viewer by Nutrient

Reported bugs

4 issues
  • Annotations randomly disappearing or not saving
  • Incompatibility issues with certain PDF files
  • Scrolling and panning problems on large PDFs
  • Unexpected crashes after iOS updates

Requested features

5 requests
  • Add a rubber/eraser tool for annotations
  • Implement a side-by-side PDF view mode
  • Improve palm rejection and gesture support
  • Allow customization of toolbar and shortcuts
  • Provide better options for PDF file management

Relyn

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

PDF Viewer by Nutrient

Subscriptions2
  • PDF Viewer Pro 3 Months7 Days trial$6.993 Months
  • PDF Viewer Pro Yearly7 Days trial$19.991 Year
None

Relyn

No in-app purchases

Questions

Is PDF Viewer by Nutrient free?
PDF Viewer by Nutrient is free to download, with in-app purchases available.
Is Relyn free?
Relyn is free to download, with no in-app purchases.
Which has better reviews, PDF Viewer by Nutrient or Relyn?
Relyn is rated higher. PDF Viewer by Nutrient averages 4.6 out of 5 from 9.1K ratings, while Relyn averages 5.0 from 1 ratings.
Do PDF Viewer by Nutrient or Relyn have ads?
Neither PDF Viewer by Nutrient nor Relyn shows ads.
Which is updated more often, PDF Viewer by Nutrient or Relyn?
PDF Viewer by Nutrient ships an update monthly, and Relyn weekly. Most recently, PDF Viewer by Nutrient was updated on November 3, 2026 and Relyn on October 31, 2026.

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