Comparison

TC Mobile I/O vs Calibration Keeper

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

Head to head

About

TC Mobile I/O

Control your TC MOBILE I/O X200 SMS relay with this application. It displays device status and sends commands, eliminating the need for manual SMS writing. Access datasheets and switch between German and English languages.

Highlights

Device status indication
Send switching commands
Eliminates manual SMS writing
Data sheet download
Multilingual support (German, English)

Features

Read full description

This app supports you in using the TC MOBILE I/O X200 SMS relay (firmware version 2.0 or later). It indicates the device status, and sends the switching commands – the manual writing of SMS is no longer necessary. Other functions and features: - Data sheet download - Languages: German, English

About

Calibration Keeper

Features

Read full description

Calibration Keeper is a product of Trihydro Corporation designed to help teams capture, store, and report data related to the calibration of equipment used in the field for Leak Detection and Repair.

Screenshots

TC Mobile I/O4 screens

Calibration Keeper4 screens

Verdict

The call

The clearest difference is iOS requirement: TC Mobile I/O at 11.0.0 against Calibration Keeper's 15.1. On price, update cadence, ads and in-app purchases 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

TC Mobile I/O ships an update every 28 months, Calibration Keeper every 16 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard1 real difference · 7 level

TC Mobile I/O versus Calibration Keeper: the parameters behind the verdict, then further details
Parameter	TC Mobile I/O	Calibration Keeper
Price	Free	Free
Positive reviews	100.0% of reviews	—
Update frequency	Every 28 months	Every 16 months — better
Ads	No	No
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	11.0.0 — better	15.1
Further details — not scored
Size	12 MB	22 MB
Age rating	4+	4+
Developer	Phoenix Contact GmbH & Co. KG	Trihydro Corporation

In-app purchases

None

TC Mobile I/O

No in-app purchases

None

Calibration Keeper

No in-app purchases

Questions

Is TC Mobile I/O free?

TC Mobile I/O is free to download, with no in-app purchases.

Is Calibration Keeper free?

Calibration Keeper is free to download, with no in-app purchases.

Do TC Mobile I/O or Calibration Keeper have ads?

Neither TC Mobile I/O nor Calibration Keeper shows ads.

Which is updated more often, TC Mobile I/O or Calibration Keeper?

TC Mobile I/O ships an update every 28 months, and Calibration Keeper every 16 months. Most recently, TC Mobile I/O was updated on October 24, 2026 and Calibration Keeper on October 26, 2026.