Comparison

reMarkable mobile vs AC Key

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

Head to head
About

reMarkable mobile

Organize, create, and access your digital notes and documents from your paper tablet on the go. Manage content with folders and tags, and create new notebooks or add pages to existing PDFs and ebooks. Sync your work seamlessly to continue where you left off.

Highlights
  • Content overview with tags and favorites
  • Create folders for organization
  • Search functionality for documents
  • Create new notebooks and add pages
  • Edit PDFs and ebooks
  • Sync content across devices
Features
Read full description

Expand your reMarkable universe: Make sure to pair your paper tablet with an account at my.remarkable.com before logging in to the app. Find login details for both in Account settings on the paper tablet. Get organized: Use the app to get an overview of your content, with tags and favorite documents. Create folders for collecting notebooks and files by topic. Save one for each project, or separate work and personal notes. This will help you find and arrange the content stored on your paper tablet with Search. You can also remove clutter by deleting any digital paper that has piled up. Fresh paper in your pocket: Our notebooks take full advantage of the flexibility of digital paper for taking notes, typing, and sketching. All of your content is always available, and you can both make fresh notebooks, folders, and add note pages in PDFs and ebooks. Take focused notes, anywhere: Make your ideas easier to refine and share on the go. Our cloud storage allows you to sync your content and pick up right where you left off on your paper tablet. Use the app to create new notebooks or quick sheets, and add blank note pages to existing documents. Checkboxes in the formatting menu are great for to-do lists. Type pages of notes, or quickly write out shorter lists to review and annotate later on your reMarkable. 
 Download the app to your mobile to make the most of your paper tablet. Discover a new way to take notes.

About

AC Key

This app allows you to unlock doors using your smartphone, eliminating the need for physical credentials. It offers an easy-to-use interface for quick access and enables temporary access for visitors.

Highlights
  • Unlock doors with smartphone
  • Replace physical credentials
  • Grant temporary visitor access
  • Customizable access duration and usage
  • Easy user registration
  • Visitor credentials do not require app installation
Features
Read full description

AC Key opens all the doors to your favorite places! Aiphone’s AC Key application eliminates the need to carry physical credentials and allows you to unlock doors swiftly and with ease, using your smartphone. KEY FEATURES - AC Key offers an easy to use and interactive interface that makes unlocking doors effortless. - User registration on the AC Key application is easy and takes only seconds. - Replace traditional credentials by using your smartphone. - Grant temporary access to visitors for a predetermined time frame and amount of uses. - Visitors are not required to have the AC Key application installed to use their visitor credentials. VISITOR ACCESS AC Key allows you to create, customize, and grant visitor access credentials directly in the application. Determine the time frame and amount of use for the credential then share this with the visitor. Visitors are not required to have the AC Key application installed to use their credentials. Administrators have the ability to allow or deny users from granting visitors access as well as revoking a visitor pass after it is issued. HOW IT WORKS -AC Key only works with the AC NIO software system. - Registration requires users to request credentials from their system administrator. If you’re interested in using AC Key in your company please visit www.aiphone.com to learn more about our access control system.

Screenshots

reMarkable mobile4 screens
AC Key3 screens

Verdict

The call

The clearest difference is rating: AC Key at 4.1 against reMarkable mobile's 2.8. AC Key also leads on iOS requirement (13.4 vs 17.0). reMarkable mobile's advantage is update cadence (every 2 months vs every 14 months) and ratings volume (516 vs 16). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

AC Key holds the better App Store score, 4.1 against 2.8. That said, the two scores are not equally well evidenced: reMarkable mobile has 516 ratings behind it against 16, so its average is the more settled of the two.

UpkeepUpdate frequency

reMarkable mobile ships an update every 2 months, AC Key every 14 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
reMarkable mobile versus AC Key: the parameters behind the verdict, then further details
ParameterreMarkable mobileAC Key
PriceFreeFree
Rating2.8 (516 ratings)4.1 (16 ratings) — better
Positive reviews27.5% of reviews—
Number of ratings516 — better16
Update frequencyEvery 2 months — betterEvery 14 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.4 — better
Further details — not scored
Size50 MB24 MB
Age rating4+4+
DeveloperreMarkable ASAiphone Corporation

Bugs and requests

reMarkable mobile

Reported bugs

5 issues
  • App crashes frequently
  • Cursor controls not working as expected
  • Sync issues causing data loss
  • Compatibility problems with newer iOS versions
  • PDF scrolling and rendering issues

Requested features

5 requests
  • Add ability to edit and annotate documents within the app
  • Implement a dark mode option
  • Improve file management and organization tools
  • Integrate with popular cloud storage services
  • Allow handwriting input on mobile devices

AC Key

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

reMarkable mobile

No in-app purchases

None

AC Key

No in-app purchases

Questions

Is reMarkable mobile free?
reMarkable mobile is free to download, with no in-app purchases.
Is AC Key free?
AC Key is free to download, with no in-app purchases.
Which has better reviews, reMarkable mobile or AC Key?
AC Key is rated higher. reMarkable mobile averages 2.8 out of 5 from 516 ratings, while AC Key averages 4.1 from 16 ratings.
Do reMarkable mobile or AC Key have ads?
Neither reMarkable mobile nor AC Key shows ads.
Which is updated more often, reMarkable mobile or AC Key?
reMarkable mobile ships an update every 2 months, and AC Key every 14 months. Most recently, reMarkable mobile was updated on October 22, 2026 and AC Key on October 24, 2026.

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