Comparison

Readwise Highlights vs Fossilise

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

Head to head
About

Readwise Highlights

This app helps you retain more of what you read by centralizing and revisiting your highlights from various reading platforms. It uses spaced repetition and active recall techniques to improve memory and offers features like tagging, note-taking, and OCR for physical books.

Highlights
  • Synchronize highlights from multiple platforms
  • Daily review habit via app and email
  • Spaced repetition and active recall
  • Tag, note, and search highlights
  • OCR for paper book highlights
  • Convert highlights to flashcards
Features
Read full description

Readwise helps you get the most out of what you read by making it fun & easy to revisit your highlights from all your favorite reading platforms in one place. Quickly synchronize your highlights from Kindle, Apple Books, Instapaper, Pocket, Medium, Goodreads, and even paper books. Then start building a daily review habit using the app and daily email. By reviewing your highlights every day, you'll retain dramatically more and you'll finally stop forgetting all the details from books you just finished! --- “Readwise is my favorite new service this year. Save highlights from Kindle, Instapaper, and now tweets... one of the best long-term personal learning tools I’ve come across.” — Caleb Hicks “Besides my Kindle, Readwise has been the most influential tech for improving my reading process.” — Blake Reichmann “If you use Kindle or Instapaper or just enjoy keeping and reading highlights, please sign up to Readwise. It will become one of your cherished services.” — Christopher Galtenberg --- ACTUALLY USE YOUR HIGHLIGHTS Highlighting is great, but why bother if you're never going to see any of your highlights again? Readwise makes it easy to quickly liberate all your highlights into one place, ensuring that you'll actually see and use them, including highlights from: • Amazon Kindle • Apple iBooks • Instapaper • Pocket • Medium • Goodreads • Twitter • Physical Books (using OCR) • Manual Input • CSV Upload STOP FORGETTING WHAT YOU READ How often do you finish a book, only to forget the key ideas two weeks later? We don't remember things by just reading them once. Readwise solves this problem using scientifically proven learning techniques called Spaced Repetition and Active Recall. Readwise resurfaces the right highlights at the right times using a daily email and an app. Readwise even makes it possible to convert your best highlights into flashcards for added retention. TAG, NOTE, SEARCH, AND ORGANIZE With your highlights all in one place, Readwise enables you to organize and connect these ideas in new ways. Use search to find a highlight instantly; use tag to organize highlights within your library; use notes to add your own annotations. HIGHLIGHT PAPER BOOKS Readwise also makes it possible to take highlights from your physical books and papers using your phone’s camera. Just snap a pic, highlight with your finger, and have your favorite highlights saved forever. --- If you are not already a Readwise subscriber, you can get started immediately with a 30-day free trial with no credit card upfront. At the end of the trial, you will not be charged unless you choose to subscribe to Readwise Full or Readwise Lite. Price may vary by location. Manage your subscription from your dashboard. --- Support: Check out readwise.io/faq or email us at hello@readwise.io Privacy Policy: https://readwise.io/tos Terms of Service: https://readwise.io/privacy

About

Fossilise

Features
Read full description

Found something odd on the beach and wondered what it is? Take a photo. Fossilise tells you which fossil it most likely is, roughly how old it is and where it sits in deep time. Keep the finds you want in a collection on your device, and see them as a grid, a timeline or a map. Identify a fossil • Take a photo or choose one from your library. Fill the frame, use good light and add a coin for scale. • Up to six fossils in one photo are picked out and numbered. • Results show the common and scientific name, the geological period with its age range in millions of years, the type of fossil, how rare it is, its story and where it lived, where known. • A confidence level (High, Good, Possible or Low) shows how sure the identification is, and "Why this ID" lists the clues it spotted in your photo. • If something might not be a fossil, or the match is a low-confidence guess, Fossilise says so plainly and suggests how to take a better photo. It is set up to look out for common lookalikes such as concretions, pyrite nodules and manganese dendrites. • Matching guide pages, including lookalikes, appear under the result. Your collection • Choose which fossils from a photo to keep. Each find keeps its photo, with a close-up when the fossil can be picked out, and the date and time you added it. • See your finds as a photo grid, as a timeline grouped by geological period from oldest to youngest, or on a map. • Turn on "Save where I found it" and each find keeps the place, such as Lyme Regis, from where you are when you save. Places are saved only on your device. • Search your finds, sort by newest, oldest, name or age, mark favourites and add notes that save as you type. • Share a find as a photo with a short summary. The place is left out on purpose, so your best spots stay yours. Ask about a find • Open a saved find and ask a question, such as how old these fossils usually are, where else they turn up or how to clean one safely. • Answers are short and in plain English. They are written by AI, so check anything important. Chats are not saved. Explore • A guide to 24 fossils, from ammonites, belemnites and fossil sea urchins to shark teeth, trilobites, ichthyosaurs and amber. • Each page covers how to recognise it, when it lived and where it's found, with places to look around the UK, from Lyme Regis and Charmouth to Whitby and Robin Hood's Bay. Tap a place to open it in Apple Maps. • A deep time ruler of the 12 geological periods, from the Cambrian to the Quaternary, across about 539 million years. Tap a period to see its key life, the guide fossils from that time and your own finds. • Today shows a fossil of the day, your latest finds and which periods your collection already covers. Daily allowance and offline use • There's a daily allowance of up to 10 scans and 20 questions, and the app shows when it resets. If identifying fails, for example with no connection, the scan isn't counted. • Your collection and the guide's text work offline. Identifying and asking need a connection. No signal on the beach? Take the picture with the Camera app and identify it later from your library. Your privacy • Your finds, photos, notes and places are kept on your device. • The photo you identify is resized, stripped of location data and sent to our server, then on to an AI service, to be identified. Questions you ask go the same way, with the find's name and details. We don't keep the photo or your questions. • No adverts and no analytics. Crash and error reports are sent so bugs can be fixed. • Your collection isn't synced to any server or other device, so deleting the app deletes your finds. Good to know • Identifications come from AI, not an expert, so they can be wrong. • Ages are an estimate for that kind of fossil, not a date for your own specimen. • Works on iPhone and iPad, in light and dark mode, with VoiceOver, Dynamic Type and Reduce Motion support.

Screenshots

Readwise Highlights4 screens
Fossilise4 screens

Verdict

The call

The clearest difference is price: Readwise Highlights at Free against Fossilise's $4.99. Readwise Highlights also leads on update cadence (every 2 weeks vs every 5 months) and iOS requirement (15.5 vs 26.1). Fossilise's advantage is in-app purchases (none vs 8). On 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

Readwise Highlights is free to download; Fossilise costs $4.99 up front. Readwise Highlights sells 8 in-app purchases, starting at $4.99 per month. Fossilise asks for nothing beyond the download.

UpkeepUpdate frequency

Readwise Highlights ships an update every 2 weeks, Fossilise every 5 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Readwise Highlights versus Fossilise: the parameters behind the verdict, then further details
ParameterReadwise HighlightsFossilise
PriceFree — better$4.99
Rating4.8 (1.5K ratings) — better—
Positive reviews69.3% of reviews—
Number of ratings1.5K — better—
Update frequencyEvery 2 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.5 — better26.1
Further details — not scored
Size112 MB16 MB
Age rating12+4+
DeveloperReadwise, IncFunctionForge

Bugs and requests

Readwise Highlights

Reported bugs

3 issues
  • Frequent app crashes
  • Sync failures with certain accounts
  • Unreliable highlight capture

Requested features

5 requests
  • Add support for more reading apps
  • Improve sync and import capabilities
  • Introduce more customization options
  • Enhance search and organization tools
  • Develop a more intuitive mobile interface

Fossilise

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Readwise Highlights

Subscriptions8
  • Readwise Lite Monthly$4.991 Month
  • Readwise Lite Monthly$6.991 Month
  • Readwise Full Monthly Plan$8.991 Month
Show 5 more
  • Readwise Full Monthly$12.991 Month
  • Readwise Lite Yearly$52.991 Year
  • Readwise Lite Yearly$66.991 Year
  • Readwise Full Yearly$94.991 Year
  • Readwise Full Yearly$119.991 Year
None

Fossilise

No in-app purchases

Questions

Is Readwise Highlights free?
Readwise Highlights is free to download, with in-app purchases available.
Is Fossilise free?
Fossilise costs $4.99, with no in-app purchases.
Do Readwise Highlights or Fossilise have ads?
Neither Readwise Highlights nor Fossilise shows ads.
Which is updated more often, Readwise Highlights or Fossilise?
Readwise Highlights ships an update every 2 weeks, and Fossilise every 5 months. Most recently, Readwise Highlights was updated on October 29, 2026 and Fossilise on October 30, 2026.

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