Smart Protractor vs MarinCompass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart Protractor
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A simple and accurate tool for measuring angles right on your iPhone. With camera support and image import, you can easily overlay a virtual protractor on real-world objects or photos. Zoom, rotate, and pan with intuitive gestures to get the exact view you need. Whether you’re tackling DIY projects, woodworking, or academic tasks, this app helps you find precise angles quickly and easily. Features: - Import and overlay images for easy angle measurement - Multi-touch controls for zoom, rotation, and panning - Clean, user-friendly interface designed for quick use on the go Perfect for anyone who needs reliable and precise angle measurement anytime, anywhere.
MarinCompass
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MarinCompassは、iPhoneの磁気センサーによる磁気方位を大きく見やすく表示するシンプルなコンパスアプリです。 端末を船首方向へ正しく固定して使用すると、現在の向きに応じた方位角と方位記号を確認できます。文字盤は滑らかに回転し、縦向き・横向きの画面に対応しています。 主な機能 ・0〜359°の磁気方位表示 ・N、NE、E、SE、S、SW、W、NWの方位表示 ・縦向き・横向き対応 ・方位センサーが利用できない場合の「No signal」表示 ・位置情報の許可状態と方位精度の表示 ・画面表示中のスリープ抑制 ご注意 このアプリはiPhoneの磁気センサーによる方位を表示します。GPSの進行方向(COG)は使用しません。 船体の金属、電源ケーブル、モーター、スピーカー、無線機などの近くでは磁気方位が乱れる場合があります。 本アプリは航海用機器ではなく、航行の安全や方位の正確性を保証するものではありません。
Screenshots
Verdict
The clearest difference is in-app purchases: MarinCompass at none against Smart Protractor's 2. MarinCompass also leads on update cadence (weekly vs every 2 weeks). 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. Smart Protractor sells 1 one-off in-app purchase. MarinCompass asks for nothing beyond the download.
Smart Protractor ships an update every 2 weeks, MarinCompass weekly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | Smart Protractor | MarinCompass |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.2 | 17.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 1 MB |
| Age rating | +4 | 4+ |
| Developer | Jun Yamabe | YOSHIKAZU OHORI |
In-app purchases
Smart Protractor
- Remove Ads2 variants$2.99
MarinCompass
No in-app purchases
Questions
Is Smart Protractor free?
Is MarinCompass free?
Do Smart Protractor or MarinCompass have ads?
Which is updated more often, Smart Protractor or MarinCompass?
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