Comparison

My Solar Panel vs Keystone

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

Head to head
About

My Solar Panel

Design and analyze solar photovoltaic systems on your smartphone. Get electricity generation estimates, payback periods, and detailed financial analyses for rooftop or commercial installations. Optimize your system for maximum output and make informed investment decisions.

Highlights
  • Design solar projects on mobile
  • Estimate electricity generation
  • Calculate payback period
  • Generate PDF reports
  • 3D panel simulator
  • Shading analysis
  • Financial analysis tools
Features
Read full description

Professional Solar Tool for any Solar Professional, DIY Enthusiast, PV Installer, PV Owner or Home Owner. You don't need PVsyst anymore. Install My Solar Panel and create your Projects from your smart phone. Design and print your Projects with our PDF option with your Company Logo! Suitable for any solar installation, rooftop PV, commercial Solar Photovoltaic Power Plants with all types of tracking options. Get the electricity generation from your desired PV with just one click. Check the payback period of your PV investment. Optimize your PV System and get maximum output from it. Please find below short description and a user manual of this user-friendly app, which is a pocket PVSyst software for fast estimations. If you are planning to invest in a Photovoltaic solar installation for your home or any other commercial and non-commercial use, you have the right tool to advise you on the feasibility of your desired solar power system. You will be able to get the best performance results for any desired location and configuration. This app will help you in the process of decision making for installation of a PV System. With My Solar Panel you will gain enormous flexibility for designing your photovoltaic panels and all other PV equipment. You can make your configuration according to your needs and set your PV system on any desired location on the map. * All in one app My Solar Panel is your assistant which offers you a various palette of parameters for any desired location on the map. It provides: - Annual electricity generation - Monthly electricity generation - Generation of unlimited PDF Reports - Tracking options (field type): fixed tilted plane, single axis horizontal tracking, single axis vertical tracking, dual axis tracking - Live 3D Panel Simulator: your phone is simulating a solar panel, rotate it to get what will be the real output from your solar panels, depending on the orientation - Shading model for PV plants: check the shadow angle, shading losses from the arrays and make an advanced optimization of your PV solar plant - Satellite maps, measuring azimuth on field and on map - Optimal tilt angles - Optimal orientation - Total area of all panels - Detailed financial analysis with cumulative cashflows for the solar PV plant lifetime - NPV, ROI, amortization - Payback period in years for your desired system - Capacity factor of your PV system - Energy degradation in 25-years period - Avoided CO2 emissions - Levelized cost of electricity (LCOE) - Energy yield - Optimization module * Easy to use - Simple and user-friendly interface. - Three steps approach: choose a location, configure your system, analyze the results. * Configuring your solar power system The model requires several input parameters in order to run the simulations. - Installed power of your PV System (panel power and number of panels) - Tilt angle of the panels - Orientation of the panels - Average electricity price of your bill or average electricity sell price (market, PPA, etc.) - solar power system cost in USD(your currency) per installed kW, including solar panel cost, solar power inverter cost and all other solar installation cost - Degradation rate of the solar panels * Optimize your results - Find out the optimal tilt angle and orientation for your PV System - Minimize your electricity losses * Get more than an app - Our goal is not only to help you find the best output for your PV System, but also to help you explore the possibility of the solar power as an unlimited source of energy and to encourage you in making a very minor impact on the climate change. - Whenever you need help for designing your PV System or interpretation of the data, please do not hesitate to contact us at support@pvdeveloper.com. Read the terms and conditions here: https://sites.google.com/view/pvfterms Read the privacy policy here: https://sites.google.com/view/iosmsp

About

Keystone

Features
Read full description

Keystone gives your projects room to breathe. Keep every project, task, and plan in one calm place, then focus on what matters today. SEE THE WHOLE PICTURE Scan your active projects in a single list. Give each one an icon, priority, and phase. Open a project to work through its tasks, fold completed work away, or archive it when it's finished. PLAN TODAY AND THE WEEK Choose the projects that belong in today's plan and schedule tasks for the day. Move to Week to see each day at a glance, plan ahead, and set recurring work days for a project. A Home Screen widget keeps today's work nearby. CAPTURE WORK QUICKLY Use the command bar to add a task to a project, schedule it for today, tomorrow, or a weekday, and set project priority. You can also add directly from an expanded project. Copy open tasks or share them as a Markdown file when you need them elsewhere. YOUR DATA STAYS YOURS Keystone works offline and syncs through your private iCloud when it's available. Export and import a full data backup from Settings, or save a separate iCloud backup. There is no Keystone account, advertising, or tracking. Built for iPhone. Simple enough to open every day.

Screenshots

My Solar Panel4 screens
Keystone4 screens

Verdict

The call

The clearest difference is in-app purchases: Keystone at none against My Solar Panel's 2. Keystone also leads on ads (none vs shown) and update cadence (fortnightly vs every 2 months). My Solar Panel's advantage is device support (3 vs 1) and iOS requirement (13.2 vs 17.0). On price 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. My Solar Panel sells 2 in-app purchases, starting at $9.99 per month. Keystone asks for nothing beyond the download.

UpkeepUpdate frequency

My Solar Panel ships an update every 2 months, Keystone fortnightly. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

Scorecard5 real differences · 5 level
My Solar Panel versus Keystone: the parameters behind the verdict, then further details
ParameterMy Solar PanelKeystone
PriceFreeFree
Rating4.6 (108 ratings) — better—
Positive reviews42.9% of reviews—
Number of ratings108 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.2 — better17.0
Further details — not scored
Size12 MB4 MB
Age rating4+4+
DeveloperIgor IlijovskiIonut Mocanu

In-app purchases

2 purchases

My Solar Panel

Subscriptions2
  • Unlock all features$9.991 Month
  • Unlock all features$39.991 Year
None

Keystone

No in-app purchases

Questions

Is My Solar Panel free?
My Solar Panel is free to download, with in-app purchases available.
Is Keystone free?
Keystone is free to download, with no in-app purchases.
Do My Solar Panel or Keystone have ads?
My Solar Panel shows ads; Keystone does not.
Which is updated more often, My Solar Panel or Keystone?
My Solar Panel ships an update every 2 months, and Keystone fortnightly. Most recently, My Solar Panel was updated on October 11, 2026 and Keystone on October 7, 2026.

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