S7 Link vs Modbus TCP Station
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
S7 Link
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A NEW APP, THE FUNCTIONS YOU KNOW β’ All the functions and tabs of previous versions are kept: pushbutton panel, manual commands, variables, alarms, point tables, PLC links, CPU status, date and time, backup and sharing β’ Updating keeps your connections, tables, options and purchases; backups made with iS7 can be restored SUPPORTED PLCS CPUs of the S7-300, S7-400, S7-1200 and S7-1500 families and LOGO!, reachable on the network through ISO on TCP (RFC 1006). S7-1200 and S7-1500 need PUT/GET access enabled and DBs without optimized access. IN-APP PURCHASE Alarm management on real PLCs is available as an in-app purchase. Whoever has already bought it keeps it. SAFETY S7 Link can write to PLCs and act on machinery in operation. Use it with care and at your own risk, and do not rely on it for safety functions. In the background, iOS decides when alarms are checked, and it can be hours apart. Requires iOS 26 or later. Siemens, SIMATIC and S7 are trademarks of Siemens AG. S7 Link is an independent product, not affiliated with or endorsed by Siemens.
Modbus TCP Station
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Turn your smartphone into a powerful Modbus TCP Master tool! Designed for PLC engineers, system integrators, and DIY enthusiasts, Modbus TCP Station allows you to communicate with, monitor, and control any Modbus TCP-enabled device (PLC, HMI, SCADA, ESP32, Raspberry Pi, etc.) with ease. Whether you are debugging a smart factory system or testing a home automation project, this app provides a professional interface to visualize and manipulate data in real-time. Key Features: β’ Complete Connectivity: Connect to any Modbus TCP Server (Slave) via IP and Port. β’ Comprehensive Function Codes: Supports FC01 (Coil), FC02 (Discrete Input), FC03 (Holding Register), and FC04 (Input Register). β’ Flexible Data Formats: View data in Binary, Unsigned/Signed Integer, Hex, Float, and Double. β’ Advanced Byte Swapping: Supports Inverse/Swap options for handling complex Word orders (Big Endian/Little Endian). β’ Real-time Monitoring: Watch your data change instantly with efficient polling. β’ Write Capabilities: Easily write values to Coils and Registers for device control. Pro Features: β’ Profile Management: Save and load unlimited connection profiles and register setups. β’ Ad-Free Experience: Focus on your work without distractions. β’ Unlimited Views: Create as many data blocks as you need. Multi-Language Support: β’ English β’ German (Deutsch) β’ Korean (νκ΅μ΄) β’ Japanese (ζ₯ζ¬θͺ) β’ Traditional Chinese (ηΉι«δΈζ - TW/HK) β’ Simplified Chinese (δΈζ) Why choose Modbus TCP Station? Stop carrying heavy laptops for simple checks. With a clean UI and robust performance, this is the essential pocket tool for every automation engineer. Download now and master your Modbus network!
Screenshots
Verdict
The clearest difference is price: Modbus TCP Station at Free against S7 Link's $14.99. Modbus TCP Station also leads on update cadence (every 10 days vs every 4 months) and iOS requirement (15.0 vs 26.0). S7 Link's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Modbus TCP Station is free to download; S7 Link costs $14.99 up front. S7 Link sells 3 one-off in-app purchases and Modbus TCP Station sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
S7 Link ships an update every 4 months, Modbus TCP Station every 10 days. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.
| Parameter | S7 Link | Modbus TCP Station |
|---|---|---|
| Price | $14.99 | Free β better |
| Update frequency | Every 4 months | Every 10 days β better |
| Ads | No β better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod β better |
| Requires iOS | 26.0 | 15.0 β better |
| Further details β not scored | ||
| Size | 10 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlo Trotti | DONGSOO LEE |
In-app purchases
S7 Link
- Alarms$2.99
- Charts$2.99
- OPC Client$4.99
Modbus TCP Station
- 1-Month Premium Pass$0.99
- Premium Upgrade$9.99
Questions
Is S7 Link free?
Is Modbus TCP Station free?
Do S7 Link or Modbus TCP Station have ads?
Which is updated more often, S7 Link or Modbus TCP Station?
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