KOSTAL InverterApp vs Fronius Solar.start
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- 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
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.
| Parameter | KOSTAL InverterApp | Fronius Solar.start |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (5 ratings) — better |
| Positive reviews | 50.0% of reviews — better | 21.8% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 78 MB | 202 MB |
| Age rating | 4+ | 17+ |
| Developer | KOSTAL Industrie Elektrik GmbH | Fronius International GmbH |
Customer experience
KOSTAL InverterApp
Fronius Solar.start
In-app purchases
KOSTAL InverterApp
No in-app purchases
Fronius Solar.start
No in-app purchases
Questions
Is KOSTAL InverterApp free?
Is Fronius Solar.start free?
Do KOSTAL InverterApp or Fronius Solar.start have ads?
Which is updated more often, KOSTAL InverterApp or Fronius Solar.start?
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