Letterbox vs Kasane
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Letterbox
Send personalized digital "Open When" letters to friends and loved ones. Customize letters with colors, fonts, and images to create unique messages for any occasion. Perfect for long-distance relationships and thoughtful gestures.
- Send personalized digital letters
- Customize letter colors and fonts
- Attach images to letters
- Create "Open When" themed letters
- Suitable for friends and partners
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Letterbox lets you send cute letter boxes to your friends and/or partner. You can customize letters by choosing their colors and fonts or by attaching an image. Use letterbox to make "Open When" letters for your loved ones. You can also pair with your partner to continue sending each other letters and getting more func couples features 3> Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Kasane
Consolidate your scattered comic resources into a single, seamless library. Access and manage comics from local storage or remote servers with an elegant interface. Enjoy a fluid, immersive reading experience with support for multiple formats and advanced viewing options.
- Aggregate multiple comic sources
- Local comic management with metadata support
- OPDS 1.2 & 2.0 protocol compatibility
- Supports Komga, Kavita servers
- CBZ, PDF, EPUB format support
- Dual-page reading mode
- Smart wide-image cutting
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Kasane (重ね, かさね) derives from the Japanese word for "stacks". It is dedicated to seamlessly aggregating your scattered comic resources into one organized place, providing a fluid and immersive reading experience. Whether your comic library is treasured locally or hosted on remote servers, Kasane helps you connect and manage them effortlessly. Say goodbye to constantly switching between apps, and browse your entire collection within one elegant interface. Core Features & Management • Multi-Instance Aggregation: Connect and manage multiple library sources simultaneously. Bring all your scattered collections together in one place. • Local Comic Management: Efficiently organize your local library. With native support for reading ComicInfo.xml metadata, your covers, authors, summaries, and tags are always perfectly organized. • Universal Standard Protocols: Fully compatible with OPDS 1.2 and OPDS 2.0. Easily connect to self-hosted comic servers like Komga and Kavita. Furthermore, it supports two-way reading progress write-back via OPDS 2.0, ensuring your reading progress stays perfectly in sync across all your devices. Powerful & Flexible Reader • Multi-Format Support: A reading engine highly optimized for comics, smoothly parsing mainstream formats including CBZ, PDF, and EPUB. • Authentic Reading Experience: Features a dual-page reading mode, perfectly recreating the page-turning feel of physical comic books. • Smart Image Splitting: Intelligently splits wide or double-page spreads, ensuring large illustrations remain clear and highly readable on any phone or tablet screen. Layer your comic world within Kasane.
Screenshots
Verdict
The clearest difference is rating: Kasane at 5.0 against Letterbox's 4.5. Kasane also leads on in-app purchases (none vs 3) and update cadence (daily vs every 6 months). Letterbox's advantage is ratings volume (4 vs 1). On price, ads, device support and iOS requirement 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. Letterbox sells 3 one-off in-app purchases. Kasane asks for nothing beyond the download.
Kasane holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
Letterbox ships an update every 6 months, Kasane daily. The most recent releases landed on October 13, 2026 and September 30, 2026 respectively.
| Parameter | Letterbox | Kasane |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (4 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 6 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17 | 17.0 |
| Further details — not scored | ||
| Size | 21 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Sajjad Alhusseini | 晨康 周 |
Customer experience
Letterbox
Kasane
In-app purchases
Letterbox
- Special Box$1.99
- Cute Box$3.99
- Love Box$5.99
Kasane
No in-app purchases









