Comparison

Readefine vs Papyrus

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

Head to head
About

Readefine

This app rewrites web content to suit your needs, offering AI-powered summarization, translation, tone changes, and simplification. It also includes a hyper-speed dictionary and unit converter.

Highlights
  • AI-powered rewording
  • Summarize web content
  • Translate into multiple languages
  • Adjust text tone and complexity
  • Hyper-speed dictionary
  • Unit and currency conversion
Features
Read full description

Readefine rewords the internet. -Dictionaries at Hyper-speed Readefine's advanced dictionary engine lets you automatically reword thousands of words and phrases. Use your own dictionary, or opt-in to our community created dictionaries, and Readefine will reword the dictionary items faster than you can say "Wait, what does that word mean?" -Convert anything from temperatures to distances to currencies -AI-Powered Rewording Magic Ever wish the internet spoke YOUR language? With our AI-driven rewording tool, it kind of does. Whether you're translating, summarizing, or just browsing, Readefine shapes the web to suit you. Readefine AI allows you to: * Simplify for Children, Average Adults, and ESL * Summarize * Complexify * Change Tones to make text sound more professional, friendly, or even sarcastic * Translate into many languages, including Spanish, Greek, Russian, and Latin * Reword as a pirate, a mob boss, or Yoda * Convert units of measurement, like Celsius to Fahrenheit With an upgraded subscription, you can change the AI prompts to reword the internet however you'd like! Try it today! Readefine Pro Subscription: Monthly: $10.00 Payments and Renewal: Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period. You can manage or turn off auto-renew in your Account settings at any time after purchase No cancellation of the current subscription is allowed during the active period. Terms of use: https://app.readefine.ai?modal=terms Privacy policy: https://app.readefine.ai?modal=privacy-policy

About

Papyrus

Organize, annotate, and cite research papers within a native Apple ecosystem. This workspace allows you to import PDFs and citation records, take notes, and manage your reading collections as structured projects. It offers local-first storage with optional cloud sync and various export formats.

Highlights
  • Read and annotate PDFs
  • Organize citation records
  • Take Markdown notes
  • Search entire library
  • Create structured projects
  • Local-first storage
  • Optional iCloud/WebDAV sync
Features
Read full description

Papyrus is a native research workspace for reading, annotating, organizing, and citing PDFs — built for iPad, iPhone, and Mac. READ AND ANNOTATE Open a paper in a fast built-in reader. Highlight, underline, and mark up pages, and every highlight stays searchable and linked back to its source. Bookmark a page as you go, and pick the paper up later from a Reading card that remembers where you stopped. On iPad, a References tab looks up the open paper's reference list and related work, so you can follow a citation trail and add what matters to your library without leaving the page. WRITE ON THE PAGE WITH APPLE PENCIL Mark up a PDF directly on iPad — annotate a proof, sketch beside a figure, work a derivation out in the margin. Your ink belongs to the paper and travels with it, encrypted, to your other devices. NOTES BESIDE THE SOURCE Keep Markdown notes next to each paper: headings, tables, code blocks, LaTeX math, and [[note]] cross-references. Notes stay with the paper and export as PDF when you need to share them. NOTEBOOKS Gather notes from across your library onto themed shelves — a topic, a chapter you're drafting, a reading group. Filing a note copies nothing and moves nothing: it still belongs to its paper, still says which paper that is, and one tap takes you there and back. A note can sit on several shelves at once. Fill a new shelf from what you've already written, search it by a note's text or by the paper behind it, order it four ways — including oldest paper first, which reads your own notes forward through the literature — and export a whole shelf as one Markdown document. All Notes lists everything you've written in one place, filed or not. ORGANIZE THE WAY YOU THINK Folders — a paper can live in several — plus tags, star ratings, and seven colored flags you can name yourself, each with its own shape so they stay tellable apart at a glance. Smart Collections keep themselves current from rules you set, including flag rules. Review Duplicates finds look-alike papers and merges each set after you confirm, combining tags, folders, projects, notes, and highlights. FIND ANYTHING Search titles, authors, notes, and highlights — or the full text inside your PDFs. TURN READING INTO WRITING Projects are where a reading pile becomes a manuscript. Group the papers behind a chapter or article, give each one a role, and capture evidence — claims, quotes, and your own interpretation — tied back to the source paper and page. Write the project note from a template (related work, method comparison, experiment plan, thesis chapter, reviewer response), keep its revision history, and run a preflight that catches missing citation keys and metadata gaps before you export. Export a bundle with Markdown, a BibTeX bibliography, and the PDFs. IMPORT AND CITE Bring in PDFs, whole folders, or BibTeX and RIS files — including libraries exported from Mendeley and Zotero. Papyrus looks up metadata by DOI or arXiv ID and fills in the details. Save papers straight from Safari with the included extension. Copy citations in the style you write in, and export BibTeX or RIS whenever you need them. READ ANYWHERE Paste an arXiv link, a DOI, or a PDF URL and Papyrus imports it, looks up the details, and fetches the PDF. Add a paper to Read Later and its PDF downloads ahead of time, so a flight or a commute doesn't need a signal. Ask Siri, or search from the Home Screen, to pick up the paper you were last reading on the page you left it. YOUR LIBRARY, YOUR DEVICES Your library syncs over iCloud across iPad, iPhone, and Mac. No account to create, no tracking, no ads. Free to download and use — every feature included, no in-app purchases, no subscription.

Screenshots

Readefine4 screens
Papyrus4 screens

Verdict

The call

The clearest difference is in-app purchases: Papyrus at none against Readefine's 1. Papyrus also leads on update cadence (weekly vs every 3 weeks). Readefine's advantage is iOS requirement (15.0 vs 17.0). On price, rating, ratings volume and ads 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. Readefine sells 1 in-app purchase, starting at $10.00 per month. Papyrus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Readefine against 5.0 for Papyrus. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

UpkeepUpdate frequency

Readefine ships an update every 3 weeks, Papyrus weekly. The most recent releases landed on October 12, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
Readefine versus Papyrus: the parameters behind the verdict, then further details
ParameterReadefinePapyrus
PriceFreeFree
Rating5.0 (2 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings22
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS15.0 — better17.0
Further details — not scored
Size9 MB30 MB
Age rating4+4+
DeveloperReadefine LLCZhenda Fu

Customer experience

Readefine

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Papyrus

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Readefine

Subscriptions1
  • Readefine AI: Pro$10.001 Month
None

Papyrus

No in-app purchases

Questions

Is Readefine free?
Readefine is free to download, with in-app purchases available.
Is Papyrus free?
Papyrus is free to download, with no in-app purchases.
Which has better reviews, Readefine or Papyrus?
Readefine and Papyrus are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.
Do Readefine or Papyrus have ads?
Neither Readefine nor Papyrus shows ads.
Which is updated more often, Readefine or Papyrus?
Readefine ships an update every 3 weeks, and Papyrus weekly. Most recently, Readefine was updated on October 12, 2026 and Papyrus on October 31, 2026.

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