Comparison

Grim Reader vs Flappy Board Controller

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

Head to head
About

Grim Reader

Organize and enrich your personal library of e-books, comics, and audiobooks. This app allows you to manage your collection locally or via your own servers, adding details like covers and author information. Enjoy a seamless reading and listening experience across all your content.

Highlights
  • Library management for e-books, comics, and audiobooks
  • Enrich library with online book and author data
  • Supports local files and personal servers (WebDAV, OPDS)
  • Cross-device reading and listening progress tracking
  • Organize by author, series, and genre
  • Mark favorites
Features
Read full description

Your books. Your library. Your way. Privacy By Design. Made in the EU. Grim Reader is a modern reader and library manager for e-books, comics and audiobooks. Keep your collection on your device, connect to your own servers, and turn even a simple collection of files into a rich, beautifully organised library. A library that feels alive Browse your collection by books, authors, series and more. See covers, reading progress and detailed information at a glance, continue where you left off, mark favourites and quickly find what you want to read next. Grim Reader is designed for both iPhone and iPad, with an interface that adapts to the device you are using. Enrich your books Missing a cover, description or other information? Grim Reader can help enrich your library using online book and author sources. Depending on the available information, Grim Reader can help you find and add details such as: • Covers and book descriptions • Authors and author information • Series information • Publisher and publication details • ISBN and other identifiers • Genres, categories and tags • Additional book metadata You remain in control and can review and edit your library information. More than e-books Grim Reader brings different types of reading together in one library: • Read e-books • Browse and read comics • Listen to audiobooks • Keep track of reading progress • Continue reading or listening across your library • Organise books by author and series • Mark books and authors as favourites Your files, your servers You don’t need to hand your library over to a commercial book platform. Grim Reader can work with books stored locally and supports personal libraries through WebDAV and OPDS, as well as the optional Grimmory server. This makes Grim Reader equally useful for a small collection on your iPhone or iPad and for a large self-hosted library. Made for readers Grim Reader focuses on your books rather than a store. There are no books to sell you and no ecosystem you need to buy into. Build the library you want, enrich it, organise it and enjoy reading it. Grim Reader — your library belongs to you.

About

Flappy Board Controller

Features
Read full description

Flappy Board Controller is the companion remote for Flappy Board — the app that turns your iPhone, iPad, or Apple TV into a stunning split-flap display. Pair with a Flappy Board display in seconds by scanning the QR code shown on screen, then send messages wirelessly from your pocket. No IP addresses, no tokens to copy — just point your camera and connect. FEATURES • Instant pairing — scan the QR code on any Flappy Board display to connect over your local network • Send messages — type and push text to your board with a tap • Manage multiple boards — save the displays you connect to and switch between them • Stays in sync — your paired boards follow you across devices with iCloud • Secure by default — connects over your board's encrypted local HTTPS API with Bearer token authentication Flappy Board Controller requires a Flappy Board display running on another device. Download Flappy Board to set one up.

Screenshots

Grim Reader3 screens
Flappy Board Controller3 screens

Verdict

The call

Grim Reader and Flappy Board Controller are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

ScorecardNo meaningful differences
Grim Reader versus Flappy Board Controller: the parameters behind the verdict, then further details
ParameterGrim ReaderFlappy Board Controller
PriceFreeFree
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size15 MB1 MB
Age rating4+4+
DeveloperMaarten de KreijGeneral Futurics LLC

In-app purchases

None

Grim Reader

No in-app purchases

None

Flappy Board Controller

No in-app purchases

Questions

Is Grim Reader free?
Grim Reader is free to download, with no in-app purchases.
Is Flappy Board Controller free?
Flappy Board Controller is free to download, with no in-app purchases.
Do Grim Reader or Flappy Board Controller have ads?
Neither Grim Reader nor Flappy Board Controller shows ads.

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