Comparison

Energy Meter vs GemRed Instruments

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

Head to head
About

Energy Meter

Monitor your SMA solar plant and identify energy wasters with real-time data. Connect locally to your PV system for instant insights into power grid performance and individual device readings.

Highlights
  • Monitor SMA Energy Meter real-time data
  • Supports SMA inverters via MODBUS
  • Automatic local network device detection
  • Energy flow display
  • Consumption measurement
  • Individual phase view
  • Collect values into charts
Features
Read full description

Monitor and discover real-time data of your SMA solar photovoltaic plant or locate secret power wasters in your home. Individual SMA sensors or inverters can be examined directly (see below list of supported devices). The app communicates locally with the solar system without a cloud. This means that real-time measured data are available at lightning speed and changes of power values are detected immediately. Discover and explore your photovoltaic system and keep track of your power grid! Connect your iPhone or iPad to the same network (WiFi) as your PV plant and get a deep insight of your power grid. The app works best with self-consumption plants (plants with Sunny Home Manager devices). The focus of the app is to monitor real-time data values. Long-term recordings are currently not possible (apart from the grid consumption measurements). ** Features ** * Monitor SMA Energy Meter real-time data * Supports SMA inverters (via MODBUS protocol only!) * Automatically finds and detects SMA devices and sensors on the local network * Energy flow display of your solar plant (self-consumption plant) at the grid connection point * Measurement of consumption values (grid consumption measurement) * Separate view of individual phases (L1, L2, L3) via Energy Meter sensors * Collecting values into charts * Detailed measured value view for each individual SMA device/sensor * Use the app to detect und jump onto the web interface of the inverter device ** Supported SMA Sensors and Inverters ** * SMA Energy Meter 1.0 + 2.0 (via Speedwire protocol) * SMA Sunny Home Manager 2.0 (supports only the build-in Energy Meter!) * SMA Sunny Boy Storage 3.7, 3.8, 5.0, 6.0 (via MODBUS) * SMA Sunny Island Storage 3.0, 4.4, 6.0, 8.0 (via MODBUS) * SMA Sunny Tripower 8.0 - 10.0 (via MODBUS) * SMA Sunny Tripower Smart Energy (Hybrid, via MODBUS) ** NOT supported devices ** * SMA Sunny Home Manager 1.0 (HM-10) Hint: Manual activation of the MODBUS protocol is required for communication with SMA inverters in the device settings. For this you need installer rights of your inverters! We are looking forward to your feedback or questions to feedback@heiko-pruessing.de! P.S.: If you like this app, please support us with a short review in the App Store or write us via App contact from within the app! SMA and Sunny Boy are registered Trademarks of SMA Solar Technology AG. Modbus is a registered Trademark of SCHNEIDER ELECTRIC USA, INC.

About

GemRed Instruments

Features
Read full description

Connect with various GemRed measuring instruments and tools. Supports synchronizing and saving measurement data to the APP, generating data tables, enabling rapid data collection, and improving work efficiency. The APP allows parameter distribution to measuring tools, making tool configuration simple and convenient.

Screenshots

Energy Meter4 screens
GemRed Instruments4 screens

Verdict

The call

The clearest difference is price: GemRed Instruments at Free against Energy Meter's $3.99. GemRed Instruments also leads on update cadence (every 10 days vs every 6 months) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

GemRed Instruments is free to download; Energy Meter costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Energy Meter ships an update every 6 months, GemRed Instruments every 10 days. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

Scorecard3 real differences ยท 5 level
Energy Meter versus GemRed Instruments: the parameters behind the verdict, then further details
ParameterEnergy MeterGemRed Instruments
Price$3.99Free โ€” better
Positive reviews86.3% of reviewsโ€”
Update frequencyEvery 6 monthsEvery 10 days โ€” better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidโ€”
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPod
Requires iOS15.012.0 โ€” better
Further details โ€” not scored
Size7 MB34 MB
Age rating4+4+
DeveloperHeiko PruessingGemRed

In-app purchases

None

Energy Meter

No in-app purchases

None

GemRed Instruments

No in-app purchases

Questions

Is Energy Meter free?
Energy Meter costs $3.99, with no in-app purchases.
Is GemRed Instruments free?
GemRed Instruments is free to download, with no in-app purchases.
Do Energy Meter or GemRed Instruments have ads?
Neither Energy Meter nor GemRed Instruments shows ads.
Which is updated more often, Energy Meter or GemRed Instruments?
Energy Meter ships an update every 6 months, and GemRed Instruments every 10 days. Most recently, Energy Meter was updated on November 1, 2026 and GemRed Instruments on October 25, 2026.

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