読マ(Dokuma) vs Raikiri Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
読マ(Dokuma)
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読書中に出会った「分からない言葉」を、本ごとに管理し、辞書を引くことができる単語帳アプリ。 AIによる単語分析機能を搭載。 読んだ本に単語を紐づけて記録。あとから本棚を眺めるように振り返れば、「あの物語で覚えた言葉」として記憶に深く定着します。革装の本と羊皮紙のような、温かみのあるデザインで読書時間に寄り添います。 ■ ISBNバーコードを読むだけで本棚に 本の裏のバーコードをスキャンするだけで、タイトル・著者・表紙を自動取得。手入力でも登録できます。 ■ AIが言葉の解説を生成 AIが、単語の意味・語源・例文を解説。 ■ 写真から単語をまとめて登録(画像AI) 気になる一節を撮影するだけで、AIが難しい単語を抽出して候補に。チェックを入れて一括登録できます。 ■ 内蔵辞書もずっと無料 Wiktionary・iOS内蔵辞書での検索は回数無制限。端末内でサクサク調べられます。 ■ 忘れた頃に、ちょうど復習 忘却曲線が「そろそろ忘れる頃」を見計らって復習を提案。紙をめくるようなカードで、覚えた/忘れたを記録します。 ■ 栞で大切な言葉に印を 重要度を3段階でマーキング。お気に入りの言葉や、重要な言葉をマークします。 ■ 読書に集中する「集中セッション」 読書タイマーで集中時間を計測。離れると優しく呼び戻し、終われば「本棚に綴じました」と記録します。連続記録(ストリーク)で習慣も後押し。 ■ あなたのデータは、あなたの手元に 書籍・単語データはすべて端末内(オフライン動作)。バックアップはあなた自身のGoogle Driveのみ。広告は一切表示しません。 そのほか、単語の読み上げ、5種類のテーマカラー、文字サイズ調整など、読書体験を心地よくする工夫を詰め込みました。 無料でも、本棚・内蔵辞書・復習・集中セッションのすべてをお使いいただけます。AI単語解説や画像AI解説も一部無料でお試しいただけます。 もっと使い込みたい方へ、Premiumなら ■ AI単語解説・画像AI解説をたっぷり利用 ■ 書籍・単語の登録上限を解除 ■ CSVエクスポート ほか
Raikiri Viewer
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Your manga and novels, ready the moment you open them. Line up the books on your Mac, NAS or Google Drive on one shelf on your iPhone and iPad, and pick up where you left off — on the train or in bed. No waiting, no hunting, and nothing between you and the page. ■ A shelf that shows you what to read next Covers line up on a real bookshelf. Box sets packed into one archive are split into volumes, so volume 3 always follows volume 2, and a bookmark ribbon shows what you're in the middle of. ■ Single page or two-page spread, one tap away Single, Spread, Split and Scroll sit right at the top of the reader. Hold it upright for single pages, turn it sideways for spreads. Reading direction is remembered per book. ■ Big spreads, big on your phone Many comics store a two-page spread as one wide image, which gets tiny on an iPhone. Split view cuts it down the middle and shows each half full size — your place and bookmarks stay put. ■ Your Mac library in your hand Pair with the Mac app and open hundreds of books on that Mac from your iPhone or iPad. No copying files around. ■ Save a stack, read offline Save as many books as you like at once. Each download shows its own progress, and finished books get a badge and land on your shelf right away. Keep reading on a plane or in the subway. ■ Google Drive folders as shelves Add a Google Drive folder as a shelf. Folders in the Files app and iCloud Drive work too. ■ Stay zoomed in, page after page Pinch to zoom into a panel, then tap to move on. The next page opens at the same zoom, right at the corner you start reading from. Choose what a tap does: follow the binding, swap left and right, or always go forward. ■ Novels the right way round, webtoons without breaks Japanese vertical text reads right to left, and tall webtoons are recognized and scroll without breaks. — A day with Raikiri (example scenes) — • 2,000 self-scanned volumes live on the Mac at home. On the morning commute, keep reading on your iPhone where you stopped last night. • Split view turns a dramatic two-page spread into two full-size pages, down to the tiny hand-lettering. • Before a weekend trip, save the next few volumes. No signal at the mountain inn, bedtime reading as usual. ■ Formats • Comics: ZIP / CBZ / RAR / CBR / 7z / CB7 / CBT, image folders • Ebooks: EPUB (reflowable and fixed layout), MOBI, PDF • Text: Aozora Bunko • Languages: English, Japanese, Spanish, Korean, Simplified Chinese ■ Pricing All features are free for your first month. After that, continue with an auto-renewing subscription, shared with the Mac app. • Raikiri Viewer Monthly: 1 month / $1.99 • Raikiri Viewer Yearly: 1 year / $17.99 Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically for the same period and price unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://raikiri.watrix.co.jp/en/privacy
Screenshots
Verdict
The clearest difference is update cadence: 読マ(Dokuma) at daily against Raikiri Viewer's every 2 days. 読マ(Dokuma) also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support 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. 読マ(Dokuma) sells 2 in-app purchases, starting at $2.99 per month and Raikiri Viewer sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
読マ(Dokuma) ships an update daily, Raikiri Viewer every 2 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | 読マ(Dokuma) | Raikiri Viewer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily — better | Every 2 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 58 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Sho Yamamoto | wataru takahashi |
In-app purchases
読マ(Dokuma)
- Dokuma Premium(月額)$2.991 Month
- Dokuma Premium(年額)$29.991 Year
Raikiri Viewer
- Monthly$1.991 Month
- Yearly1 Month trial$17.991 Year








