Comparison

FieldBus Toolkit vs Modbus TCP FieldKit

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

Head to head
About

FieldBus Toolkit

Features
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FieldBus Toolkit is the essential utility for embedded engineers and PLC programmers. Debug Modbus TCP, MQTT, HTTP, and socket communications directly from your mobile device. [Key Features] 1. Multi-Protocol Support - Modbus TCP Client - MQTT Client (Publish/Subscribe) - HTTP REST Client (GET, POST, PUT, DELETE) - TCP/UDP Client & Server (Echo/Broadcast) 2. Data Visualization - Send and receive data in ASCII or HEX format. - Real-time communication logs. 3. Efficiency Tools - Save frequently used commands as Macros for quick access. - One-touch data transmission. 4. Developer Friendly - Perfect for testing Arduino, ESP32, Raspberry Pi, and industrial PLCs.

About

Modbus TCP FieldKit

Features
Read full description

Modbus TCP FieldKit puts a professional Modbus TCP toolkit in your pocket. Commission equipment in the field, validate setups in the lab, or troubleshoot home automation — all from your iPhone. â€ĸ Connect to any Modbus TCP device — read coils and registers, monitor data blocks in real time â€ĸ Save device profiles for one-tap reconnection to frequently used endpoints â€ĸ Write with confidence — every write operation requires your explicit confirmation â€ĸ Built-in foreground simulator — run editable coils and holding registers for testing â€ĸ Track active connections and review bounded local logs kept on your device â€ĸ All data stays local — logs and exports are sanitized by default Requires Local Network access for device communication. Default server port is 1502. Background server operation and port 502 support pending device validation.

Screenshots

FieldBus Toolkit4 screens
Modbus TCP FieldKit4 screens

Verdict

The call

The clearest difference is price: FieldBus Toolkit at Free against Modbus TCP FieldKit's $4.99. FieldBus Toolkit also leads on iOS requirement (13.0 vs 18.0). Modbus TCP FieldKit's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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

FieldBus Toolkit is free to download; Modbus TCP FieldKit costs $4.99 up front. FieldBus Toolkit sells 1 one-off in-app purchase. Modbus TCP FieldKit asks for nothing beyond the download.

UpkeepUpdate frequency

FieldBus Toolkit ships an update every 2 months, Modbus TCP FieldKit every 3 weeks. The most recent releases landed on September 8, 2026 and September 17, 2026 respectively.

Scorecard5 real differences ¡ 1 level
FieldBus Toolkit versus Modbus TCP FieldKit: the parameters behind the verdict, then further details
ParameterFieldBus ToolkitModbus TCP FieldKit
PriceFree — better$4.99
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better18.0
Further details — not scored
Size29 MB11 MB
Age rating4+4+
DeveloperDONGSOO LEEVladimir Chemeris

In-app purchases

1 purchases

FieldBus Toolkit

One-time1
  • Remove Ads$1.99
None

Modbus TCP FieldKit

No in-app purchases

Questions

Is FieldBus Toolkit free?
FieldBus Toolkit is free to download, with in-app purchases available.
Is Modbus TCP FieldKit free?
Modbus TCP FieldKit costs $4.99, with no in-app purchases.
Do FieldBus Toolkit or Modbus TCP FieldKit have ads?
FieldBus Toolkit shows ads; Modbus TCP FieldKit does not.
Which is updated more often, FieldBus Toolkit or Modbus TCP FieldKit?
FieldBus Toolkit ships an update every 2 months, and Modbus TCP FieldKit every 3 weeks. Most recently, FieldBus Toolkit was updated on September 8, 2026 and Modbus TCP FieldKit on September 17, 2026.

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