TC Mobile I/O vs whatwatt
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Device status indication
- Send switching commands
- Eliminates manual SMS writing
- Data sheet download
- Multilingual support (German, English)
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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
whatwatt
This utility app is preparing for future enhancements. Developers are working on new functionalities that will be revealed soon.
- Future feature groundwork
- Upcoming enhancements
- Developer updates
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The app that allows you to install whatwatt Go on a compatible smart meter, receive smart meter data in real time and connect your smart meter to services. Made for Switzerland.
Screenshots
Verdict
The clearest difference is update cadence: whatwatt at every 2 weeks against TC Mobile I/O's every 28 months. TC Mobile I/O's advantage is iOS requirement (11.0.0 vs 17.0). On price, review sentiment, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
TC Mobile I/O ships an update every 28 months, whatwatt every 2 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.
| Parameter | TC Mobile I/O | whatwatt |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 28 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 11.0.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Phoenix Contact GmbH & Co. KG | whatwatt AG |
Customer experience
TC Mobile I/O
whatwatt
In-app purchases
TC Mobile I/O
No in-app purchases
whatwatt
No in-app purchases
