Comparison

PDF Viewer by Nutrient vs ADHD Cricket

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

ADHD Cricket

This app provides gentle, periodic chirps to help users stay focused on their tasks. It allows customization of intervals, sounds, and active hours, running quietly in the background to offer a subtle reminder to check task alignment.

Highlights
  • Customizable focus intervals
  • Choice of ambient sounds
  • Adjustable pitch and volume
  • Scheduled operation during active hours
  • Background operation
  • Simple and intuitive interface
Features
Read full description

Stay focused, stay on track. ADHD Cricket gently chirps at regular intervals through your day — a small nudge to pause and ask: "Am I still on task?" If your attention tends to wander, those regular check-ins make a real difference. No nagging, no clutter — just a friendly cricket chirp to bring you back. How it works: • Set your active days and hours • Pick your interval (every 5 minutes to every 2 hours) • Choose your sound — cricket, bird, or sine — with pitch and volume to taste • Press Start and get on with your day Pro tip: keep a notepad handy. When you hear the chirp, jot down what you've been doing, then refocus. Runs quietly in the background — it chirps on schedule even when your phone is locked, and rests outside your chosen hours. Simple, calm, and built to fit around your life.

Screenshots

PDF Viewer by Nutrient4 screens
ADHD Cricket4 screens

Verdict

The call

The clearest difference is in-app purchases: ADHD Cricket at none against PDF Viewer by Nutrient's 2. ADHD Cricket also leads on rating (5.0 vs 4.6) and review sentiment (100% vs 73%). PDF Viewer by Nutrient's advantage is ads (none vs shown) and ratings volume (9.1K vs 1). On price 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. ADHD Cricket asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ADHD Cricket 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. Written reviews point the same way: 73% of PDF Viewer by Nutrient's written reviews are positive against 100% of ADHD Cricket's.

UpkeepUpdate frequency

PDF Viewer by Nutrient ships an update monthly, ADHD Cricket every 9 days. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

Scorecard8 real differences · 2 level
PDF Viewer by Nutrient versus ADHD Cricket: the parameters behind the verdict, then further details
ParameterPDF Viewer by NutrientADHD Cricket
PriceFreeFree
Rating4.6 (9.1K ratings)5.0 (1 ratings) — better
Positive reviews73.4% of reviews100.0% of reviews — better
Number of ratings9.1K — better1
Update frequencyMonthlyEvery 9 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFreemiumAd-supported — better
DevicesiPhone, iPad, Mac, Vision Pro — betteriPhone, iPad, iPod
Requires iOS17.013.0 — better
Further details — not scored
Size112 MB27 MB
Age rating4+4+
DeveloperPSPDFKit GmbHANDREW JONATHON TAYLOR

Customer experience

PDF Viewer by Nutrient

All ratings9,096 ratings
Positive90.8%
Neutral3.7%
Negative5.4%
Written reviews1,092 reviews
Positive73.4%
Neutral9.7%
Negative16.9%

ADHD Cricket

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
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

ADHD Cricket

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

ADHD Cricket

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 ADHD Cricket free?
ADHD Cricket is free to download, with no in-app purchases.
Which has better reviews, PDF Viewer by Nutrient or ADHD Cricket?
ADHD Cricket is rated higher. PDF Viewer by Nutrient averages 4.6 out of 5 from 9.1K ratings, while ADHD Cricket averages 5.0 from 1 ratings.
Do PDF Viewer by Nutrient or ADHD Cricket have ads?
ADHD Cricket shows ads; PDF Viewer by Nutrient does not.
Which is updated more often, PDF Viewer by Nutrient or ADHD Cricket?
PDF Viewer by Nutrient ships an update monthly, and ADHD Cricket every 9 days. Most recently, PDF Viewer by Nutrient was updated on October 19, 2026 and ADHD Cricket on October 10, 2026.

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