Comparison

Memrbl vs Underlined

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

Head to head
About

Memrbl

Transform your reading into an active learning experience. This app uses AI to create interactive challenges, quizzes, and summaries from your books, enhancing memory and focus. Enjoy audio narration and track your progress as you master new information.

Highlights
  • AI-generated quizzes and summaries
  • Memory-building challenges
  • Spaced repetition learning
  • Gamified reinforcement
  • Distraction blocker
  • Audio narration
  • Progress tracking
Features
Read full description

Earn your right to doomscroll. Memrbl locks the apps you can't stop opening. Lessons from the books you care about open them again. Here's how it works. Pick the apps that eat your day. Every right answer in a Memrbl lesson earns you minutes on them. When the minutes run out, they lock until you learn a little more. Rough day? You get a few emergency unlocks. The lessons are the good part. Pick any book. Memo, our brain mascot, asks what you want from it and where you'll use it. Then you get a path of short lessons for that book, in the version that fits your life. Each lesson starts with a guess. Then you see why. You catch the false claim, compare ideas that look alike, apply the idea to a situation like yours, and leave with a plan for the next time it comes up. No highlighting. No summaries you forget by Friday. Just answers, feedback and a plan. • 3 million+ books • Lessons that fit your life • Brain Power: today's learning against today's scrolling • Minutes you don't use roll over • Lessons in any order SUBSCRIPTION Browsing books, Memo's questions and the knowledge check are free. Learning paths and lessons need a subscription: yearly, which starts with a discounted first month for new subscribers, or weekly. Payment is charged to your Apple Account when you confirm your purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period. You can manage or cancel it anytime in your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.memrbl.com/privacy

About

Underlined

Features
Read full description

You underline as you read. Then the lines stay in the book, because typing one out is more work than it is worth in the moment. Underlined is a reading tracker built around getting them out. Photograph the page, draw a box round the passage, and it is yours. A PASSAGE WITHOUT TYPING IT • Photograph the page and draw a box round what you underlined. Nothing is retyped. • The box is coarse on purpose: it only has to contain the passage. The words are trimmed back to whole sentences, so a box that clips a few still gives a clean quotation. • The page number is read off the photograph, so keeping a line from page 214 moves your reading progress to 214. When it cannot be read, the app asks. • Text read off a page is never quietly corrected. A word that looks wrong is offered as a suggestion — against word lists carried on the phone, in twenty-six languages — and nothing changes until you say so. • Star the ones that matter. Add a thought underneath while it is still fresh. A SHELF IN ONE PHOTOGRAPH • Point the camera at a row of spines instead of typing forty titles. • Books standing up, books lying flat, a shelf shot at an angle, all without turning the picture. • A single cover works too, for the book in your hand. • Everything found is shown to you first. You choose which go on the shelf and which shelf. YOUR READING YEAR • One goal for the year, paced against how far into the year it actually is — not against a flat count. • Three shelves and no ceremony: want to read, reading, finished. Your TBR is just a shelf. • Keep the page you are on; the last page finishes the book on its own. • Write down how a book left you, in a sentence or two. • Statistics about reading, not about scores: passages kept this month, this year and all time; how many you starred; how long they run; books finished, by year. WHAT YOU KEEP COMES BACK • A passage resurfaces each day, from your own collection. • Search every line you ever kept, with your words marked where they were found. • The ones you return to rise: the app counts which passages you come back to. • Dig into a passage with a model that runs on your phone, never a server. (Recent iPhones.) • Read a passage in another language through Apple's own translation sheet. DISCOVER • Passages other readers underlined, narrowed by subject, in the languages you read. • Keep the ones that stay with you; they join your own shelf. • Find the book behind a line: what it is about, more by the author, books shelved beside it, and where to buy a copy. • Offer a passage of your own if you like — a button you press, never something the app does on its own. Anything can be reported and taken down. TAKE IT WITH YOU • Send a passage as a picture, set as a page rather than a screenshot. • Export one book's passages, or everything you have ever kept, as a PDF set at paperback size. YOUR LIBRARY STAYS YOURS • No account. Nothing to sign up for and nothing to sign in to. • Your books, your progress and your passages live on your phone. • The app does not upload your notes and it does not track you. • Eight languages in the app itself, and passages in twenty-six. • A colour for every book; paper by day, ink by night. FREE AND PRO Five books, free, with every feature working — the camera included. Keeping passages is free without limit and always will be: it is what the app is for. Underlined Pro opens the shelf to as many books as you keep. SUBSCRIPTION Underlined Pro is an auto-renewing subscription: $2.99 a month, or $19.99 a year. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless turned off at least 24 hours before the period ends; manage or cancel it in your Apple Account settings. Privacy policy: https://www.threedollarclub.com/underlined/privacy.html Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Discover passages come from Wikiquote, used under CC BY-SA 4.0. Book information comes from Open Library.

Screenshots

Memrbl4 screens
Underlined4 screens

Verdict

The call

The clearest difference is iOS requirement: Memrbl at 16.0 against Underlined's 18.0. On price, update cadence, ads and in-app purchases 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. Memrbl sells 3 in-app purchases, starting at $2.99 per 7 days and Underlined sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Memrbl ships an update every 10 days, Underlined fortnightly. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 8 level
Memrbl versus Underlined: the parameters behind the verdict, then further details
ParameterMemrblUnderlined
PriceFreeFree
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 10 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone
Requires iOS16.0 — better18.0
Further details — not scored
Size80 MB24 MB
Age rating17+4+
DeveloperUntitld LabsMert Arman

In-app purchases

3 purchases

Memrbl

Subscriptions3
  • Memrbl Premium3 Days trial$2.997 Days
  • Unlimited Monthly$14.991 Month
  • Unlimited Yearly Access7 Days trial$89.991 Year
2 purchases

Underlined

Subscriptions2
  • Underlined - Monthly$2.991 Month
  • Underlined - Yearly$19.991 Year

Questions

Is Memrbl free?
Memrbl is free to download, with in-app purchases available.
Is Underlined free?
Underlined is free to download, with in-app purchases available.
Do Memrbl or Underlined have ads?
Neither Memrbl nor Underlined shows ads.
Which is updated more often, Memrbl or Underlined?
Memrbl ships an update every 10 days, and Underlined fortnightly. Most recently, Memrbl was updated on October 16, 2026 and Underlined on October 25, 2026.

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