Cayin Control vs Grim Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cayin Control
This app allows users to remotely manage and control Cayin Hi-Fi audio hardware over a local network. It offers features like device pairing, custom EQ settings, multi-screen playback, and playlist creation for an optimized audio experience.
- LAN device pairing
- Custom parametric EQ
- Multi-screen interactive playback
- Precise playback control
- Custom playlist creation
- Centralized device management
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Cayin Controller is an exclusive smart control App designed for all Cayin Hi-Fi & audio hardware. Connect your Cayin amplifiers and music players via local area network easily for centralized device management. • LAN Device Pairing: Auto-scan all Cayin audio gadgets under the same Wi-Fi network, switch controlled equipment with one tap; • Custom Parametric EQ: Professional equalizer enables personalized frequency adjustment, tailor sound curves for different music genres and listening spaces; • Multi-screen Interactive Playback: Link multiple mobile terminals on same network to edit playlists, share favorite tracks and enjoy interactive music together; • Precise Playback Control: Adjust volume, switch audio sources, manage play/pause, skip tracks and set playback loop modes effortlessly; • Custom Playlist Creation: Build private playlists, collect your beloved songs and access your music library instantly. Optimize your Hi-Fi listening experience with professional-level tuning tools, ideal for audiophiles and daily home audio management.
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is rating: Grim Reader at 5.0 against Cayin Control's 1.0. Grim Reader also leads on ratings volume (4 vs 1). Cayin Control's advantage is iOS requirement (13.0 vs 17.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Grim Reader holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.
Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 22, 2026 and October 10, 2026 respectively.
| Parameter | Cayin Control | Grim Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 4 — better |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 179 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Zhuhai Spark Electronic Equipment Co., Ltd. | Maarten de Kreij |
Customer experience
Cayin Control
Grim Reader
In-app purchases
Cayin Control
No in-app purchases
Grim Reader
No in-app purchases









