Comparison

RF Engineer's Calc vs My Solar

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

Head to head
About

RF Engineer's Calc

Features
Read full description

A simple RF Engineer's Calculator. Convert Watts to dBm, calculate dBm power changes, convert Return Loss to VSWR, etc...

About

My Solar

Access real-time statistics for your home solar installation, including power generation, battery, and grid usage. View data via widgets, notifications, and Siri. Control charge/discharge settings and sync inverter time.

Highlights
  • Real-time solar generation stats
  • Home and lock screen widgets
  • Apple Watch complications
  • Siri integration
  • Battery and grid usage monitoring
  • Inverter charge/discharge control
  • Inverter clock synchronization
Features
Read full description

My Solar provides quick and easy access to up-to-date statistics for your home solar installation on iPhone and Apple Watch. Todays latest statistics are available direct in the app, via home and lock screen widgets, through notifications and also with Siri. My Solar currently supports installations with Solis inverters. Data is retrieved via the Solis Cloud API (freely available from Solis on request) or by using the open-source Solis Cloud Scraper project. Details for both are available in the app. Future versions will support different manufacturers inverters. The My Solar app presents current power generation statistics, showing you details for solar yield, electricity consumption and both battery and grid usage. In addition it also presents the same statistics for the day so-far. My Solar gives you at-a-glance access to your data by exposing information through widgets that can be directly installed on your iPhone home and lock screens or complications to use on your Apple Watch face. A variety of widgets are available to show individual or combined statistics, including current solar yield, current battery charge, electricity distribution, inverter temperature and a daily summary. Widgets refresh automatically to show the latest data. My Solar can also give you both a current and daily summary via Siri on all devices. Just ask "Hey Siri, display current stats from My Solar" for the current data or "Hey Siri, display todays stats from My Solar" for a summary of today so far. My Solar can notify you when your home battery discharges to a certain percentage, e.g when it reaches its minimum discharge level. It can also notify you when your home battery reaches a certain charge, e.g when you're approaching a full battery. You're also able to set an inverter temperature threshold to be notified about. With My Solar you can control the charge and discharge settings of your inverter. This is ideal if you have a cheaper overnight tariff and want to charge your batteries ready for the next day, or discharge batteries via a feed-in tariff. It's accessible right from the front screen and is simple and easy to use. You'll need to contact Solis for access to the appropriate API, but that is very straightforward and details are included in the app. My Solar will verify you have the correct API access before it allows you to purchase this upgrade, so you can have confidence your setup is correct. My Solar can even remind you to update these settings on a daily basis. My Solar will also synchronise your inverter timer with your iPhone. No more fiddly setting via the inverter, simply tap the button in My Solar and your inverter clock will be synchronised with your iPhone. You can also schedule a weekly background sync, so you never have to check again. The My Solar app presents clear current and daily statistics on both iPhone and Apple Watch. The iPhone app is where you configure your Solis Cloud API or Solis Cloud Scraper login details.

Screenshots

RF Engineer's Calc3 screens
My Solar4 screens

Verdict

The call

The clearest difference is price: RF Engineer's Calc at Free against My Solar's $2.99. RF Engineer's Calc also leads on in-app purchases (none vs 1). My Solar's advantage is update cadence (every 6 weeks vs every 10 months). On ads, device support and iOS requirement 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

RF Engineer's Calc is free to download; My Solar costs $2.99 up front. My Solar sells 1 one-off in-app purchase. RF Engineer's Calc asks for nothing beyond the download.

UpkeepUpdate frequency

RF Engineer's Calc ships an update every 10 months, My Solar every 6 weeks. The most recent releases landed on September 5, 2026 and September 7, 2026 respectively.

Scorecard3 real differences ยท 5 level
RF Engineer's Calc versus My Solar: the parameters behind the verdict, then further details
ParameterRF Engineer's CalcMy Solar
PriceFree โ€” better$2.99
Positive reviewsโ€”87.5% of reviews
Update frequencyEvery 10 monthsEvery 6 weeks โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
Monetizationโ€”Free with in-app purchases
DevicesiPhoneiPhone, Apple Watch โ€” better
Requires iOS16.116.0 โ€” better
Further details โ€” not scored
Size43 MB10 MB
Age rating4+4+
DeveloperGRAHAM JOHN SMITHRichard Levy

In-app purchases

None

RF Engineer's Calc

No in-app purchases

1 purchases

My Solar

One-time1
  • Inverter Charge/Discharge$2.99

Questions

Is RF Engineer's Calc free?
RF Engineer's Calc is free to download, with no in-app purchases.
Is My Solar free?
My Solar costs $2.99, and also offers in-app purchases.
Do RF Engineer's Calc or My Solar have ads?
Neither RF Engineer's Calc nor My Solar shows ads.
Which is updated more often, RF Engineer's Calc or My Solar?
RF Engineer's Calc ships an update every 10 months, and My Solar every 6 weeks. Most recently, RF Engineer's Calc was updated on September 5, 2026 and My Solar on September 7, 2026.

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