LRTK vs OPEN EX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LRTK
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Easily Handle High-Accuracy Survey Data on Your Smartphone This is the dedicated app for the "LRTK" centimeter-level GNSS device (*1). By connecting to the LRTK receiver and configuring Network RTK (NtripClient), you can achieve centimeter-level positioning accuracy. Through integration with the LRTK Cloud (*2), captured location data can be instantly synced and viewed via a web browser. Key Features & Use Cases: • Easy access to high-accuracy surveying. • Instantly share field survey data with office PCs. • Manage location data alongside site photos. • Easily acquire point cloud data. Note on Altitude Calculation: To obtain JGD2011 (Japan Geodetic Datum 2011) altitude, this app utilizes the calculation API provided by the Geospatial Information Authority of Japan (*3). (*1) https://www.lefixea.com/lrtk (*2) https://lconstruction.lefixea.jp/ (*3) https://vldb.gsi.go.jp/sokuchi/surveycalc/api_help.html
OPEN EX
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OPEN EX ビューワーとは OPEN EXシステムを通して、エクステリア工事の物件情報や様々なファイルを共有できるアプリです。 数が多くて整理の大変な図面や写真ファイルをクラウド上で一元管理することで、ミスやロスを削減しましょう! OPEN EX ビューワーがあれば、アプリからファイルを直接アップロードして共有することができます。 最新の図面や仕様書なども、クラウドでスムーズに最新の内容を共有する事ができます。 PDFや画像ファイルだけでなく、BIMxファイル(パースと図面が完全連動)も簡単に開く事ができ、施行着手までのスピードもUPします。
Screenshots
Verdict
The clearest difference is update cadence: LRTK at weekly against OPEN EX's every 5 weeks. OPEN EX's advantage is iOS requirement (15.0 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. Neither carries in-app purchases, so what you see is what you pay.
LRTK ships an update weekly, OPEN EX every 5 weeks. The most recent releases landed on October 30, 2026 and October 27, 2026 respectively.
| Parameter | LRTK | OPEN EX |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 880 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | レフィクシア株式会社 | RIK Corporation |
In-app purchases
LRTK
No in-app purchases
OPEN EX
No in-app purchases







