HTML Keep vs モーター回転数計
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HTML Keep
Easily view local HTML, Markdown, and ZIP files on your iPhone or iPad. Import files via Share or Open In for quick previews of web pages, notes, or web packages without needing an internet connection.
- Open local HTML files
- Native Markdown preview
- Import ZIP web packages
- No account or login required
- No cloud dependency
- Simple, fast interface
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HTML Keep is a simple, lightweight tool for browsing local HTML / Markdown / ZIP files. When you receive or save an HTML / Markdown / ZIP file on your phone and the system tools cannot show it as directly as a computer can, HTML Keep helps you preview the file quickly. You can import HTML / Markdown / ZIP files into HTML Keep through Share or Open In, then view them on iPhone or iPad. -- Useful for -- · Opening HTML / Markdown / ZIP files sent by others · Previewing web pages and Markdown documents you made · Viewing local pages, notes, or web packages transferred from a computer · Temporarily browsing offline HTML content · Reading local Markdown notes, instructions, or documents · Viewing ZIP files that contain multiple web resources · Testing simple HTML and CSS pages -- Key features -- · Open HTML files locally · Native preview for Markdown files · Import and organize ZIP web packages · No account required · No login required · No cloud server dependency · Simple interface, ready when opened · Good for lightweight previews and everyday viewing -- Focused on one small problem -- HTML Keep is not a complex developer tool or a web hosting service. It focuses on one specific problem: helping you open local HTML, Markdown, and ZIP files more easily on your phone. -- Note -- Because HTML / ZIP files can structure and reference resources in different ways, some images, styles, scripts, or external resources may not display completely. Some Markdown extensions, embedded content, or external resources may also behave differently depending on where the file came from. This app is better suited for quick viewing, temporary previews, and everyday browsing of local HTML / Markdown / ZIP files. --- HTML Keep Pro: HTML Keep Pro is available as annual and monthly subscriptions. Pro features include iCloud sync across devices, Agent automation, putting multiple pages on the Home Screen, recovering older deleted pages, and more. Annual and monthly plans are auto-renewable subscriptions. Payment is charged to your Apple Account, and the subscription renews automatically unless canceled before the end of the current period. You can cancel auto-renewal anytime in App Store or Apple Account subscription settings. Actual prices are shown by the App Store before purchase for your country or region, and may vary by region, taxes, and promotions. Terms of Use: https://help.htmlkeep.com/legal/terms/ Privacy Policy: https://help.htmlkeep.com/legal/privacy/
モーター回転数計
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モーターに近づけるだけ。無負荷回転数がその場でわかる。 模型用の小型ブラシモーター(130・540サイズ)の駆動音を iPhone のマイクで拾い、その周波数から無負荷回転数(rpm)を算出する音響式の回転数計です。専用の回転計を用意しなくても、慣らし(ブレークイン)や選別のたびに回転数を確かめ、記録して比べられます。 ■ 数字が「止まる」 解析した回転数が安定すると、数字がロックして動かなくなります。揺れ続ける数値を目で追う必要はありません。ロックした値の最大(MAX)は針で残るので、一番回る個体がひと目でわかります。 ■ 測って、記録して、比べる モーターごとに測定を記録(回転数・電圧・電源・メモ)。同じロットの個体同士や、慣らし前後を並べて比較できます。 ■ 使い方 1. ピニオンを外し、モーターを無負荷で回す 2. iPhone のマイク(本体下部)をエンドベル側に 5〜10cm ほど近づける 3. 数字がロックしたら「保存」 ■ 無料でできること ・リアルタイムの回転数(rpm)と周波数(Hz)、ロック、MAX ・スロット係数(3 / 5 / カスタム)と、手持ちの回転計の値で合わせる較正 ・モーター台帳 3本まで、その範囲での比較、結果の共有画像 ■ Pro(買い切り) ・台帳 4本目以降(無制限) ・電圧補正(3.0V 換算)での比較 ・慣らしの推移グラフと伸び率 ・CSV 書き出し ・ギア比・タイヤ径からの理論最高速(無負荷・目安) ■ ご注意 ・無負荷時の測定専用です。走行中・負荷時の回転数は測れません。 ・周囲の騒音や複数のモーターの同時運転は測定に影響します。1本ずつ、静かな場所でお使いください。 ・音響方式のため数値は目安です。慣らし前後や個体間の相対比較にお使いください。 ・音声は端末内で処理し、保存・送信は一切しません。 本アプリはミニ四駆をはじめとする模型用モーターの計測を想定して作られていますが、株式会社タミヤとは一切関係ありません。
Screenshots
Verdict
The clearest difference is update cadence: HTML Keep at every 2 days against モーター回転数計's monthly. 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. HTML Keep sells 4 in-app purchases, starting at $2.99 per month and モーター回転数計 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
HTML Keep ships an update every 2 days, モーター回転数計 monthly. The most recent releases landed on October 2, 2026 and October 15, 2026 respectively.
| Parameter | HTML Keep | モーター回転数計 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 days — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 22 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 光 杨 | Shuhei Yamamoto |
In-app purchases
HTML Keep
- HTML Pocket Pro Monthly$2.991 Month
- HTML Pocket Pro Yearly14 Days trial$14.991 Year
- HTML Pocket Premium Lifetime Promo$14.49
- HTML Pocket Premium Lifetime$29.99
モーター回転数計
- モーター回転数計 Pro$4.99









