Comparison

SmartESS vs KOSTAL Solar App

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

Head to head
About

SmartESS

Monitor your energy storage machine's status in real-time with this mobile application. It offers easy-to-understand data visualization, historical data access from anywhere, and displays information in multiple dimensions. The app is designed for efficient data transfer with minimal internet traffic usage.

Highlights
  • Real-time energy storage machine monitoring
  • Intelligent data visualization
  • Simple and easy-to-understand charts
  • Access historical data anytime, anywhere
  • Multi-dimensional data display
  • Low internet traffic usage
Features
Read full description

Optical storage treasure is a mobile terminal application software for intelligent monitoring energy storage machine, which enables users to monitor the energy storage machine status information in real time more easily and quickly. intelligent Data visualization, the chart is simple and easy to understand More wise Show real-time and historical data over the web anytime, anywhere rich Display real-time and historical data in multiple dimensions save The traffic generated by the Internet is small, fast, and does not occupy large traffic charges.

About

KOSTAL Solar App

Monitor your photovoltaic system remotely with this free app. View generation and consumption data, access historical information, and utilize a virtual battery feature for forecasting. Requires access to the KOSTAL solar portal and an inverter.

Highlights
  • Remote photovoltaic system monitoring
  • View generation and consumption data
  • Access historical system data
  • 3-day generation and consumption forecast
  • Virtual battery simulation
  • Graphical data display
Features
Read full description

Professional monitoring for your photovoltaic system. Important: The KOSTAL Solar App now obtains data from the new KOSTAL Solar portal. Data and information from the PIKO Solar Portal are no longer displayed in the app. To enable you to use the KOSTAL Solar App with your existing solar portal account, KOSTAL will send you a welcome e-mail in the the next few days, asking you to re-enter your password. If you do not want to wait for the welcome e-mail, you can use the "Reset password" function on the KOSTAL Solar Portal website for your existing account. KOSTAL Solar App The free KOSTAL Solar App offers professional monitoring of your photovoltaic system. You can conveniently and easily retrieve all functions from your smartphone or tablet at any time. To set up and use the app, you need access to the KOSTAL solar portal and an inverter installed there. For the login of the app the same access data as for the solar portal are needed. General information With the KOSTAL Solar App, you can now conveniently monitor your solar systems while you are on the move or from your couch, and display relevant system data. You have the opportunity to access the consumption and generation data over different periods such as day, week, month and year, as well as access to the historical data of your plant. With this app, you are always up to date. Download the free KOSTAL Solar App now and take advantage of the new and enhanced features. Start page On the start page, the current home consumption is shown graphically as well as percentage. You can immediately see from the diagram how your own home consumption is covered by PV, a battery or the public grid. A new feature shows you a 3-day forecast for generation and home consumption. With a simple swipe action with your finger to "right" or "left" on the individual tiles, you can view more areas. By clicking on the drop-down arrows, you can display extended dates or periods. Last data Under the "Last Data" the last live values of the last transfer to your installation are displayed to the KOSTAL Solar Portal. The new diagram shows the home consumption [W], the feed in [W], the generation [W], as well as values relating to a battery. If you do not have a own battery yet, you can use the KOSTAL Solar App to activate a virtual battery and see the resulting savings. Try it for yourself and see what the Virtual Battery calculates. History Under "History" you can graphically display the historical data of your plant. Here you can switch between the daily, monthly, annual and total values of domestic consumption and production. You can switch these views of house consumption and generation again with a "swipe action". The highlight of the KOSTAL Solar App is the virtual battery, in which you can select a desired capacity and calculate an individual forecast. In the lower area you will see an overview of your respective values (home consumption / production). The data from the last available periods are compared in weekly, monthly or annual sections. Thus, you can immediately see if your income has increased or decreased compared to previous years.

Screenshots

SmartESS4 screens
KOSTAL Solar App4 screens

Verdict

The call

The clearest difference is rating: SmartESS at 2.7 against KOSTAL Solar App's 2.0. SmartESS also leads on ratings volume (127 vs 6). KOSTAL Solar App's advantage is review sentiment (56% vs 20%). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SmartESS holds the better App Store score, 2.7 against 2.0. That said, the two scores are not equally well evidenced: SmartESS has 127 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 20% of SmartESS's written reviews are positive against 56% of KOSTAL Solar App's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

SmartESS ships an update monthly, KOSTAL Solar App every 3 weeks. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

Scorecard3 real differences · 7 level
SmartESS versus KOSTAL Solar App: the parameters behind the verdict, then further details
ParameterSmartESSKOSTAL Solar App
PriceFreeFree
Rating2.7 (127 ratings) — better2.0 (6 ratings)
Positive reviews19.7% of reviews56.4% of reviews — better
Number of ratings127 — better6
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.5
Further details — not scored
Size198 MB68 MB
Age rating4+4+
Developer祥梯 孟KOSTAL Solar Electric GmbH

Customer experience

SmartESS

All ratings125 ratings
Positive33.6%
Neutral11.2%
Negative55.2%
Written reviews468 reviews
Positive19.7%
Neutral11.3%
Negative69.0%

KOSTAL Solar App

All ratings6 ratings
Positive16.7%
Neutral16.7%
Negative66.7%
Written reviews55 reviews
Positive56.4%
Neutral18.2%
Negative25.5%

In-app purchases

None

SmartESS

No in-app purchases

None

KOSTAL Solar App

No in-app purchases

Questions

Is SmartESS free?
SmartESS is free to download, with no in-app purchases.
Is KOSTAL Solar App free?
KOSTAL Solar App is free to download, with no in-app purchases.
Which has better reviews, SmartESS or KOSTAL Solar App?
SmartESS is rated higher. SmartESS averages 2.7 out of 5 from 127 ratings, while KOSTAL Solar App averages 2.0 from 6 ratings.
Do SmartESS or KOSTAL Solar App have ads?
Neither SmartESS nor KOSTAL Solar App shows ads.
Which is updated more often, SmartESS or KOSTAL Solar App?
SmartESS ships an update monthly, and KOSTAL Solar App every 3 weeks. Most recently, SmartESS was updated on October 23, 2026 and KOSTAL Solar App on October 26, 2026.

Other comparisons