Comparison

WattGuru vs Solar Panel Layout

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

Head to head
About

WattGuru

Features
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WattGuru turns your iPhone, iPad and Mac into a practical toolbox for electricity and energy. Calculate values, document meter readings and save calculation cases clearly – without a WattGuru account, advertising or tracking. ELECTRICAL TOOLS - Ohm's law from any two known values - Power and current for DC, single-phase AC and three-phase AC - Cable cross-section, voltage drop and maximum cable length - Energy, runtime, battery charging and consumption costs - Series and parallel resistor networks plus voltage dividers - Conversion of electrical units METERS AND COSTS Record household, sub, appliance, generation and storage meters. Log standard and off-peak readings, follow consumption and costs in charts, and exchange your own data using CSV when needed. PROJECTS AND REFERENCE Save calculator results together with inputs and assumptions in projects. The built-in reference explains voltage, current, power, energy, cables, protective measures and safe measurement in clear language. PRIVATE AND AVAILABLE ACROSS DEVICES Your data stays on your device by default. Optional iCloud sync keeps meters, tariffs and projects in step across your own Apple devices. cgNetsphere does not receive this content. WattGuru includes no advertising, tracking or analytics services. WattGuru is a calculation, planning and documentation aid. Work on electrical installations must be carried out by qualified people. Applicable standards, protective measures and manufacturer instructions always take precedence.

About

Solar Panel Layout

Read full description

Solar Roof Layout helps you quickly estimate the solar potential of a roof. Measure a roof surface, run a solar panel layout, and get a clear estimate of how many PV modules can fit. The app focuses on the essentials: roof area, available surface, solar panels, PV layout, and quick estimation. Features: • Roof measurement • Available surface calculation • Solar panel layout • Estimated number of PV modules • Simple result visualization • Mobile tool for solar projects Solar Roof Layout helps you prepare a solar project, compare roof areas, and quickly estimate how many photovoltaic modules can fit on a roof. Designed for residential and professional solar projects, the app gives you a simple way to work on roof layout without complex software. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://azimutis.app/en/privacy.html

Screenshots

WattGuru4 screens
Solar Panel Layout4 screens

Verdict

The call

The clearest difference is iOS requirement: Solar Panel Layout at 15.0 against WattGuru's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. WattGuru sells 1 one-off in-app purchase and Solar Panel Layout sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

WattGuru ships an update fortnightly, Solar Panel Layout weekly. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

Scorecard1 real difference Ā· 5 level
WattGuru versus Solar Panel Layout: the parameters behind the verdict, then further details
ParameterWattGuruSolar Panel Layout
PriceFreeFree
Update frequencyFortnightlyWeekly — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.615.0 — better
Further details — not scored
Size9 MB27 MB
Age rating4+4+
DeveloperMichael CaklecFrederic Billon

In-app purchases

1 purchases

WattGuru

One-time1
  • WattGuru Full Version$3.99
2 purchases

Solar Panel Layout

Subscriptions2
  • Pro7 Days trial$2.991 Month
  • Pro7 Days trial$17.991 Year

Questions

Is WattGuru free?
WattGuru is free to download, with in-app purchases available.
Is Solar Panel Layout free?
Solar Panel Layout is free to download, with in-app purchases available.
Do WattGuru or Solar Panel Layout have ads?
Neither WattGuru nor Solar Panel Layout shows ads.
Which is updated more often, WattGuru or Solar Panel Layout?
WattGuru ships an update fortnightly, and Solar Panel Layout weekly. Most recently, WattGuru was updated on October 25, 2026 and Solar Panel Layout on October 10, 2026.

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