Comparison

KOSTAL InverterApp vs Fronius Solar.start

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

Head to head
About

KOSTAL InverterApp

Access and manage KOSTAL drive controllers with Bluetooth via your smartphone or tablet. Perform diagnostics, commissioning, and parameter settings remotely. Data records are compatible with PC software for seamless workflow.

Highlights
  • Bluetooth connectivity
  • Wizard-guided commissioning
  • Save and copy device settings
  • Send data records via email
  • Parameter settings in plain text
  • Control drive controller
  • Access process variables
  • Error analysis and history
Features
Read full description

The KOSTAL INVERTER app can be used to very simply access all KOSTAL drive controllers in the INVEOR family with Bluetooth via your smartphone or tablet. Convenient and rapid diagnosis and commissioning is therefore possible at any time and from anywhere. The following functions are available: • Wizard-guided commissioning • Save and copy device settings to other drive controllers • Send data records by e-mail • Stored support e-mail address • Parameter settings in plain text • Control mode, control the drive controller via your mobile end device • Access to all process variables • Device information • Error analysis, error history • Demo mode • Data records compatible with KOSTAL INVERTERpc software The app’s demo mode also allows it to be fully tested even without a drive controller. The data records are fully compatible with the familiar INVERTERpc PC software allowing data records to be produced with ease on the PC and loaded onto drive controllers using the app. Vice versa, the app can be used to read data records in the field, send them by e-mail and analyse them on the PC. If you have any questions, suggestions or comments, don’t hesitate to e-mail us at Drives@KOSTAL.com KOSTAL Industrie Elektrik GmbH

About

Fronius Solar.start

This app simplifies the setup of Fronius inverters and related devices through a guided, step-by-step process. It allows for quick commissioning, firmware updates, and integration with the Fronius Solar.web monitoring platform directly from a mobile device.

Highlights
  • QR-code scanning for device setup
  • Step-by-step commissioning guide
  • Inverter firmware updates
  • Network and product configuration
  • Integration with Fronius Solar.web
  • Quick access to web interface
  • How-to videos
Read full description

The Fronius Solar.start app helps the installer to quickly and easily set up our Fronius devices, i.e. GEN24, Verto and Tauro inverters, Smart Meter IP, Reserva, Reserva Pro or Ohmpilot by a simple QR-code scan. The device can be commissioned directly from your phone or tablet by following the step-by-step guide. Set up your Fronius inverter in just a few minutes: - Inverter firmware update of GEN24, Verto and Tauro for initial commissionings - Quick and easy commissioning in just three steps 1) Network settings 2) Product configuration 3) Integration into the Fronius Solar.web monitoring platform - Quick access to the web interface for additional settings and functions - Quick action function "Scan to connect" for a faster connection to the device - Full warranty coverage when you register the inverter on Fronius Solar.web - Useful step by step installation and setup videos for Fronius products - Useful manuals for installation, operation and maintenance about Fronius products - Link to useful platforms such as Fronius Solar.web and Fronius Solar.SOS

Screenshots

KOSTAL InverterApp4 screens
Fronius Solar.start4 screens

Verdict

The call

The clearest difference is review sentiment: KOSTAL InverterApp at 50% against Fronius Solar.start's 22%. KOSTAL InverterApp also leads on iOS requirement (13.0 vs 16.0). 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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
KOSTAL InverterApp versus Fronius Solar.start: the parameters behind the verdict, then further details
ParameterKOSTAL InverterAppFronius Solar.start
PriceFreeFree
Rating—3.0 (5 ratings) — better
Positive reviews50.0% of reviews — better21.8% of reviews
Number of ratings—5 — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size78 MB202 MB
Age rating4+17+
DeveloperKOSTAL Industrie Elektrik GmbHFronius International GmbH

Customer experience

KOSTAL InverterApp

Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Fronius Solar.start

All ratings5 ratings
Positive40.0%
Neutral20.0%
Negative40.0%
Written reviews55 reviews
Positive21.8%
Neutral5.5%
Negative72.7%

In-app purchases

None

KOSTAL InverterApp

No in-app purchases

None

Fronius Solar.start

No in-app purchases

Questions

Is KOSTAL InverterApp free?
KOSTAL InverterApp is free to download, with no in-app purchases.
Is Fronius Solar.start free?
Fronius Solar.start is free to download, with no in-app purchases.
Do KOSTAL InverterApp or Fronius Solar.start have ads?
Neither KOSTAL InverterApp nor Fronius Solar.start shows ads.
Which is updated more often, KOSTAL InverterApp or Fronius Solar.start?
KOSTAL InverterApp ships an update every 2 months, and Fronius Solar.start every 2 months. Most recently, KOSTAL InverterApp was updated on October 11, 2026 and Fronius Solar.start on October 24, 2026.

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