Comparison

KOSTAL Solar App vs Deye Cloud

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

Head to head
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.

About

Deye Cloud

This app facilitates the establishment, monitoring, and maintenance of new energy power stations. It offers transparent management through a big data platform, supporting various power station and equipment types for efficient operation and troubleshooting.

Highlights
  • Power station establishment
  • Real-time data monitoring
  • Operation and maintenance services
  • After-sales support
  • Transparent power station management
  • Accurate alarm positioning
  • Intelligent data analysis
Features
Read full description

"Supporting the establishment, data acquisition, data monitoring, one-stop operation maintenance and after-sales service of all new energy power stations. Through the Deye Cloud big data platform, all types of power stations with transparent management which improves the value of power stations comprehensively. 【Rich Types of Power Stations】 Power stations can be built everywhere. Deye Cloud big data will help you to build your own photovoltaic power station in the shortest time. 【Rich Equipment Types】 breaking the traditional limitation, it can comprehensively monitor the operation of the system composed of photovoltaic, battery, fan, power grid, micro inverter, diesel generator, load, ups and smartload 【Rich Functions and Applications】 accurate alarm positioning and efficient troubleshooting;Intelligent data analysis reduces troubleshooting time;The energy flow map can grasp the direction of energy quickly; Multiple working modes to realize diversified power station management. 【Cooperate with the Merchant Version】 With power station authorization function, you can authorize the power station you created to the merchant and working together to ensure the safety and stability of the power station. Meanwhile, you can also recieve the power station from merchant which saves the operation of power station build and equipment configuration. "

Screenshots

KOSTAL Solar App4 screens
Deye Cloud4 screens

Verdict

The call

The clearest difference is rating: Deye Cloud at 4.8 against KOSTAL Solar App's 2.0. Deye Cloud also leads on ratings volume (280 vs 6) and review sentiment (69% vs 56%). 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

Deye Cloud holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: Deye Cloud has 280 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 56% of KOSTAL Solar App's written reviews are positive against 69% of Deye Cloud's.

UpkeepUpdate frequency

KOSTAL Solar App ships an update every 3 weeks, Deye Cloud every 2 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard3 real differences · 7 level
KOSTAL Solar App versus Deye Cloud: the parameters behind the verdict, then further details
ParameterKOSTAL Solar AppDeye Cloud
PriceFreeFree
Rating2.0 (6 ratings)4.8 (280 ratings) — better
Positive reviews56.4% of reviews69.1% of reviews — better
Number of ratings6280 — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS14.5 — better15.1
Further details — not scored
Size68 MB221 MB
Age rating4+4+
DeveloperKOSTAL Solar Electric GmbH萃绩科技(上海)有限公司

Customer experience

KOSTAL Solar App

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

Deye Cloud

All ratings280 ratings
Positive94.3%
Neutral1.4%
Negative4.3%
Written reviews81 reviews
Positive69.1%
Neutral1.2%
Negative29.6%

Bugs and requests

KOSTAL Solar App

Not enough reviews yet to summarise bugs or requests.

Deye Cloud

Reported bugs

21 issues
  • Data from inverter isn’t live
  • Push notifications not working
  • No push notifications alerts
  • Copilot ended up costing us £150 extra every month
  • App isn’t working on IOS
Show 16 more
  • Data is not realtime
  • App does not display true total capacity
  • Disconnected from the grid it sends me push notifications every minute
  • Internal feedback form doesn’t work
  • Localization to Ukrainian language is poor
  • Data polling time is really high at 5-6 mins
  • Inexplicably long periods of no data logging/indication if being offline
  • Always offline from 0600hrs to 1900 hrs
  • Can’t log in for the past 2 weeks!
  • Account does not exist, email does not exist!
  • App is logging me out and i cant sign in for few days already!
  • If i try to recover password, says email does no exist!
  • Region switching is gone
  • Unable to log-in, login info has changed
  • APP not receiving data after last update
  • Network unavailable

Requested features

8 requests
  • Add total yield
  • Suggest a third option: Force Sell Mode
  • Still see load usage when selling first
  • Build more servers around the world
  • Dedicated app server centre in Australia
Show 3 more
  • Add Ukrainian language
  • Include data from an EV charger
  • Settings to control where power goes first

In-app purchases

None

KOSTAL Solar App

No in-app purchases

None

Deye Cloud

No in-app purchases

Questions

Is KOSTAL Solar App free?
KOSTAL Solar App is free to download, with no in-app purchases.
Is Deye Cloud free?
Deye Cloud is free to download, with no in-app purchases.
Which has better reviews, KOSTAL Solar App or Deye Cloud?
Deye Cloud is rated higher. KOSTAL Solar App averages 2.0 out of 5 from 6 ratings, while Deye Cloud averages 4.8 from 280 ratings.
Do KOSTAL Solar App or Deye Cloud have ads?
Neither KOSTAL Solar App nor Deye Cloud shows ads.
Which is updated more often, KOSTAL Solar App or Deye Cloud?
KOSTAL Solar App ships an update every 3 weeks, and Deye Cloud every 2 weeks. Most recently, KOSTAL Solar App was updated on October 26, 2026 and Deye Cloud on October 27, 2026.

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