Comparison

LRTK vs OPEN EX

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

LRTK

Features
Read full description

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

About

OPEN EX

Features
Read full description

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

LRTK4 screens
OPEN EX4 screens

Verdict

The call

The clearest difference is update cadence: LRTK at weekly against OPEN EX's monthly. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

LRTK ships an update weekly, OPEN EX monthly. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

Scorecard2 real differences · 4 level
LRTK versus OPEN EX: the parameters behind the verdict, then further details
ParameterLRTKOPEN EX
PriceFreeFree
Update frequencyWeekly — betterMonthly
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size730 MB44 MB
Age rating4+4+
Developerレフィクシア株式会社RIK Corporation

In-app purchases

None

LRTK

No in-app purchases

None

OPEN EX

No in-app purchases

Questions

Is LRTK free?
LRTK is free to download, with no in-app purchases.
Is OPEN EX free?
OPEN EX is free to download, with no in-app purchases.
Do LRTK or OPEN EX have ads?
Neither LRTK nor OPEN EX shows ads.
Which is updated more often, LRTK or OPEN EX?
LRTK ships an update weekly, and OPEN EX monthly. Most recently, LRTK was updated on September 23, 2026 and OPEN EX on October 1, 2026.

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