Koma
H.Sumisu Books & Reference Contains ads
A manga viewer compatible with ZIP, CBZ, RAR, CBR, and EPUB formats. Completely free with only ads. Enjoy a smooth and comfortable reading experience.
- Downloads
- 120+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Sep 20
- 2026 · v1.13.1
Screenshots
About Koma
━━━━━━━━━━━━━━━━━━━━━━━
📖 Koma — Enjoy your manga comfortably.
━━━━━━━━━━━━━━━━━━━━━━━
A simple yet highly functional viewer app designed for comfortably reading downloaded manga files on your smartphone.
No charges, no login required. Completely free to use with only ads.
───────────────────────
✅ Supported File Formats
───────────────────────
ZIP / CBZ / RAR / CBR / EPUB
Covers all major manga file formats.
Open your favorite works directly.
───────────────────────
📂 Easy-to-Use File Management
───────────────────────
Features an explorer screen that allows you to search for files while browsing folders.
Switch between grid and list views to manage your reading in your preferred style.
Thumbnail view lets you see the content at a glance, and the reading progress bar lets you easily see "how far you've read."
───────────────────────
📚 Comfortable Reading Experience
────────────────────────
◆ Freely Select Reading Direction
Right → Left (Japanese Manga Style) / Left → Right (Western Style)
Vertical Scrolling (Web Comic Style)
◆ Double-Page Display
Double-page mode allows for immersive double-page reading.
◆ Page Jump with Slider
Page thumbnails are previewed while dragging.
Quickly jump to your desired scene.
◆ Automatic Continuous Reading to the Next Volume
When you reach the last page, it automatically advances to the next file.
It starts background development of the next volume with 10 pages remaining,
allowing for smooth reading with zero waiting time.
───────────────────────
🎨 Eye-Friendly Reading Settings
───────────────────────
◆ Brightness Adjustment (Comfortable for Night Reading)
◆ Sepia/Grayscale Filter
◆ Page Fit Switching (Full Page Display/Width Fit)
───────────────────────
🔖 Bookmark & Progress Management
───────────────────────
◆ Add and Manage Bookmarks Page by Page
◆ Automatic Recording of Reading History
◆ Statistical Display of Number of Books Read, Books Currently Reading, and Total Page Count
◆ Easy Operation: Long-Press to Mark as Read or Return to Unread
───────────────────────
🔒 Privacy Priority
───────────────────────
All data is stored on your device.
No data is uploaded to the cloud or sent to external servers.
No login or registration is required.
───────────────────────
💡 Recommended for:
───────────────────────
・Those who want to read downloaded manga on their smartphone
・Those who find existing viewers difficult to use
・Those looking for a simple app with few ads
・Those who want to enjoy manga at their own pace
───────────────────────
【Caution】
───────────────────────
This app is a file viewer. We do not provide any content.
Please use only files that you legally own.
This app does not encourage the illegal use of copyrighted content.
【About Screenshots】
The screenshots used for the app introduction use "Black Jack ni Yoroshiku," which is freely available from Shuho Sato.
(Source: https://densho810.com/free/)
Developer: H.Sumisu
📖 Koma — Enjoy your manga comfortably.
━━━━━━━━━━━━━━━━━━━━━━━
A simple yet highly functional viewer app designed for comfortably reading downloaded manga files on your smartphone.
No charges, no login required. Completely free to use with only ads.
───────────────────────
✅ Supported File Formats
───────────────────────
ZIP / CBZ / RAR / CBR / EPUB
Covers all major manga file formats.
Open your favorite works directly.
───────────────────────
📂 Easy-to-Use File Management
───────────────────────
Features an explorer screen that allows you to search for files while browsing folders.
Switch between grid and list views to manage your reading in your preferred style.
Thumbnail view lets you see the content at a glance, and the reading progress bar lets you easily see "how far you've read."
───────────────────────
📚 Comfortable Reading Experience
────────────────────────
◆ Freely Select Reading Direction
Right → Left (Japanese Manga Style) / Left → Right (Western Style)
Vertical Scrolling (Web Comic Style)
◆ Double-Page Display
Double-page mode allows for immersive double-page reading.
◆ Page Jump with Slider
Page thumbnails are previewed while dragging.
Quickly jump to your desired scene.
◆ Automatic Continuous Reading to the Next Volume
When you reach the last page, it automatically advances to the next file.
It starts background development of the next volume with 10 pages remaining,
allowing for smooth reading with zero waiting time.
───────────────────────
🎨 Eye-Friendly Reading Settings
───────────────────────
◆ Brightness Adjustment (Comfortable for Night Reading)
◆ Sepia/Grayscale Filter
◆ Page Fit Switching (Full Page Display/Width Fit)
───────────────────────
🔖 Bookmark & Progress Management
───────────────────────
◆ Add and Manage Bookmarks Page by Page
◆ Automatic Recording of Reading History
◆ Statistical Display of Number of Books Read, Books Currently Reading, and Total Page Count
◆ Easy Operation: Long-Press to Mark as Read or Return to Unread
───────────────────────
🔒 Privacy Priority
───────────────────────
All data is stored on your device.
No data is uploaded to the cloud or sent to external servers.
No login or registration is required.
───────────────────────
💡 Recommended for:
───────────────────────
・Those who want to read downloaded manga on their smartphone
・Those who find existing viewers difficult to use
・Those looking for a simple app with few ads
・Those who want to enjoy manga at their own pace
───────────────────────
【Caution】
───────────────────────
This app is a file viewer. We do not provide any content.
Please use only files that you legally own.
This app does not encourage the illegal use of copyrighted content.
【About Screenshots】
The screenshots used for the app introduction use "Black Jack ni Yoroshiku," which is freely available from Shuho Sato.
(Source: https://densho810.com/free/)
Developer: H.Sumisu
What’s new
Version 1.13.1 · Updated September 20, 2026
- Fixed pages turning when tapping near the bottom of the screen while reading. A light tap at the bottom now shows the navigation bar instead, and it hides again automatically. - The navigation bar now appears together with the reader menu.
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