Software602 Signer vs Sx3App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Software602 Signer
This premium tool facilitates electronic signatures, time stamps, and data mailbox management. It supports authorization of various document types and mobile photos with GPS data, utilizing qualified digital signatures and remote certificate storage.
- Electronic signature authorization
- Time stamping
- Data mailbox management
- Support for PDF, PDF/A, Office 365 documents
- XML form data authorization
- Mobile photo authorization with GPS
- Qualified digital signature creation
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Signer is a premium tool for handling electronic signatures, time stamps and data mailboxes. Uses selected qualified SecuSign services (https://www.602.cz/secusign/). Authorization of documents (PDF, PDF/A), XML form data (FormApps) and mobile photographs with GPS coordinates with an electronic signature and time stamp. Support for qualified digital signature creation according to eIDAS with certificates stored in remote signing service (HSM), validation of qualified certificates issued within the EU. Viewing received and sent data messages in your personal as well as company data mailbox and sending new data messages with direct creation of the document to be sent.
Sx3App
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SX3app is a dedicated real-time monitoring application for Solax X3 Hybrid G4 inverters. It provides a fast and clear overview of live performance, battery status and key system data — whether you are at home or on the go. KEY FEATURES • Live inverter data with near real-time updates • Battery status and energy flow overview • Spot price graphs • Automatic connection via local network or cloud • Quick device setup using QR code scanning • Spot energy price overview (where available) FAST AND SIMPLE CONNECTION SX3app can automatically detect the available connection method and choose the fastest way to access your inverter. This ensures reliable monitoring without complicated setup. WHO IS IT FOR The app is ideal for photovoltaic system owners, installers and advanced users who want detailed insight into their Solax X3 Hybrid G4 operation. PRIVACY AND SECURITY SX3app does not collect personal user data. Connections are made directly to your device or through the official cloud interface. Note: Some features may depend on inverter firmware version and the type of communication dongle used.
Screenshots
Verdict
The clearest difference is price: Software602 Signer at Free against Sx3App's $9.99. Sx3App's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement 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
Software602 Signer is free to download; Sx3App costs $9.99 up front. Software602 Signer sells 2 one-off in-app purchases. Sx3App asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on July 21, 2026 and September 12, 2026 respectively.
| Parameter | Software602 Signer | Sx3App |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 | 17.6 |
| Further details — not scored | ||
| Size | 60 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Software602 a.s. | Emtron s.r.o |
In-app purchases
Software602 Signer
- Next year of Signer usage$49.99
- Signer Licence + 1 year$129.99
Sx3App
No in-app purchases









