Comparison

iSolergo vs sZephyr

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

Head to head
About

iSolergo

Features
Read full description

iSolergo lets you make the preliminary design of a photovoltaic system in a few minutes, with the energy analysis, the configuration of photovoltaic modules and inverters and evaluation of plant profitability. In preliminary inspection, the App uses the resources of the device to automatically determine location, orientation and inclination of the modules, in order to obtain a complete energy evaluation of the site, using the global database climate. So, you can proceed by selecting PV modules and their better coupling with the inverter you want. The application verifies all the conditions of consistency (voltage, current and power) between the inverter and string combinations proposed and used. Solergo can handle systems with inverter with more trackers connected to strings with different exposures. The software contains an extensive and multi-brand modules and inverters database, with all the technical characteristics necessary for the calculation of the production system, considering the losses due to thermal drift of the modules, mismatching, losses in DC and efficiency of the inverter. In few steps, choosing the installation situation, the method of connection and tariff iSolergo calculates the resulting revenues. Adding the typical costs for installation and management, with the overall economic analysis, you can evaluate the profitability of the system and the cash flows resulting. All the calculations are shown on charts and tables easy to understand, to provide the potential customer all the information clearly and complete. All project data are stored on a file standard Solergo (software for the complete design of photovoltaic systems), and can be sent directly or via e-mail to your office computer.

About

sZephyr

Features
Read full description

sZephyr stands out as one of the premium application which provides smart control over the AC to the user. It supports, one to many and many to one and many to many interface with the AC and provides the user the data based informed decision making for conserving energy.

Screenshots

iSolergo4 screens
sZephyr4 screens

Verdict

The call

The clearest difference is update cadence: sZephyr at every 5 weeks against iSolergo's every 9 months. iSolergo's advantage is iOS requirement (11.0 vs 14.0). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

iSolergo ships an update every 9 months, sZephyr every 5 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard2 real differences ยท 4 level
iSolergo versus sZephyr: the parameters behind the verdict, then further details
ParameteriSolergosZephyr
PriceFreeFree
Update frequencyEvery 9 monthsEvery 5 weeks โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPod
Requires iOS11.0 โ€” better14.0
Further details โ€” not scored
Size63 MB43 MB
Age rating4+4+
DeveloperElectro Graphics SrlIINVSYS Private LIMITED

In-app purchases

None

iSolergo

No in-app purchases

None

sZephyr

No in-app purchases

Questions

Is iSolergo free?
iSolergo is free to download, with no in-app purchases.
Is sZephyr free?
sZephyr is free to download, with no in-app purchases.
Do iSolergo or sZephyr have ads?
Neither iSolergo nor sZephyr shows ads.
Which is updated more often, iSolergo or sZephyr?
iSolergo ships an update every 9 months, and sZephyr every 5 weeks. Most recently, iSolergo was updated on November 1, 2026 and sZephyr on November 3, 2026.

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