OpenUaExplorer v1.0.0 Beta 1
The first beta release of OpenUaExplorer, a cross-platform OPC UA client for browsing, inspecting, and monitoring OPC UA servers.





Highlights

• Discover server endpoints and connect using standard OPC UA security policies.
• Authenticate anonymously, with a username and password, or with an X.509 client certificate.
• Manage certificates and trust decisions using the built-in certificate store.
• Browse the OPC UA address space and inspect node attributes and references.
• Write attribute values and call methods.
• Create subscriptions and monitor data changes and events.
• Read data and event history.
• Plot subscribed values on live trend graphs.
• Save favorite servers and access recent connections.
• Save and restore sessions, including opening session files directly from the operating system.
• Follow client activity in the built-in log.
• Switch between light and dark themes.

Downloads
Choose the appropriate package from the assets below:

• Windows 10 or later (x64): installer
• macOS 15 or later (Apple silicon): DMG image
• Linux (x86-64): AppImage, DEB, or RPM package

Beta notice
This is a beta release. Some features and interface elements may change, and you may encounter bugs. We do not recommend relying on this build as the only diagnostic tool for critical production systems.

Please report bugs and suggestions through GitHub Issues. When reporting an issue, include your operating system, application version, and relevant log output whenever possible.

 

OpenUaExplorer 1.0.0-rc1

The first release candidate. Everything planned for 1.0 is in — from here on it's bug fixes only.



Connections and security

• Passwords can be remembered per profile, stored in the OS keychain — never in the session file.
• Certificate handling was reworked. The PKI manager derives the application URI from the client certificate, so mismatched-URI rejections — the most common and least explicable OPC UA failure — no longer happen silently.
• Errors say what went wrong: a rejected user token, a rejected certificate and an unreachable endpoint are now told apart, and retry loops stop flooding the log with the same warning.
• The connection dialog was redesigned — it no longer jumps around as you switch authentication modes.

Browsing and values

• Browsing is incremental. The tree fetches one node at a time and keeps going when a branch fails, so one refused node no longer stalls the rest — and large folders don't freeze the UI.
• Much broader type formatting, driven by the node's DataType: timestamps render as dates instead of 64-bit integers, short arrays are summarised inline, and encoded images open in a viewer instead of a wall of hex.
• The write dialog accepts hexadecimal byte input, which makes writing ByteStrings practical.
• Data Access moved to a tree view, and closed pages can be restored — close a tab by accident and it comes back. Long text is elided with a tooltip carrying the full value.

Trends

• Zoom and pan, with history re-read from the server for the visible range rather than reused from the buffer — so zooming out gives you real data, not a coarser version of what you already had.
• Hover shows a value plaque tracking the series under the cursor, and live series extend without the gaps at the leading edge that beta 2 had.
• Chartability is decided from DataType and ValueRank, so non-numeric nodes don't offer a trend that can't be drawn.

Everything else

• Optional debug logging with configurable depth; routine non-events demoted from warnings.
• Sessions carry a schema version, so files written now stay readable as the format evolves.
• Translations updated across German, Russian and Simplified Chinese, switchable live.
• Third-party licences now ship with the application.

Downloads
Choose the appropriate package from the assets below:

• Windows 10 or later (x64): installer
• macOS 15 or later (Apple silicon): DMG image
• Linux (x86-64): AppImage, DEB, or RPM package