Atc.LogViewer is a free open source program to receive and view log messages.
Atc.LogViewer for Windows has a live messages view.
- It can tail files.
- It has helpful color highlighting.
- It has useful message filtering on:
- term/phrases,
- start/end time.
- Log messages are displayed in real-time (Tail-files)
- File format support:
- log4net
- NLog
- Serilog
- Multi sources (files and folders)
- Drag and drop files and folders from Windows-Explore
- Customizable color highlighting
- Lightweight and very fast
- Run as a Windows application
- Support dark mode
- Auto scroll
| Light-Mode | Dark-Mode |
|---|---|
List mode  |
List mode  |
Graph: Log Level Distribution  |
Graph: Log Level Distribution  |
Graph: Timeline Distribution  |
Graph: Timeline Distribution  |
| LogLevel | Value | Method | Description |
|---|---|---|---|
| Trace | 0 | LogTrace | Contain the most detailed messages. These messages may contain sensitive app data. These messages are disabled by default and should not be enabled in production. |
| Debug | 1 | LogDebug | For debugging and development. Use with caution in production due to the high volume. |
| Information | 2 | LogInformation | Tracks the general flow of the app. May have long-term value. |
| Warning | 3 | LogWarning | For abnormal or unexpected events. Typically includes errors or conditions that don't cause the app to fail. |
| Error | 4 | LogError | For errors and exceptions that cannot be handled. These messages indicate a failure in the current operation or request, not an app-wide failure. |
| Critical | 5 | LogCritical | For failures that require immediate attention. Examples: data loss scenarios, out of disk space. |
| None | 6 | Specifies that no messages should be written. |
layout = "%date [%thread] %-5level %logger - %message%newline%exception"2024-02-16 09:15:01,123 [8] INFO Root - Application Start
2024-02-16 09:15:03,456 [8] DEBUG ModuleLoader - Loading modules
2024-02-16 09:15:04,789 [8] INFO ModuleA - Module A initialized
2024-02-16 09:15:05,012 [8] DEBUG ModuleB - Module B initialization started
2024-02-16 09:15:05,234 [8] INFO ModuleB - Module B initialized
2024-02-16 09:15:06,345 [8] WARN ModuleC - Module C is deprecated
2024-02-16 09:15:07,456 [8] INFO ModuleC - Module C initialized anyway
2024-02-16 09:15:08,567 [8] DEBUG DatabaseConnection - Attempting connection to database
2024-02-16 09:15:09,678 [8] ERROR DatabaseConnection - Database connection failed due to timeout
2024-02-16 09:15:10,789 [8] INFO DatabaseRetry - Retrying database connection
2024-02-16 09:15:11,890 [8] DEBUG DatabaseConnection - Database connection attempt 2
2024-02-16 09:15:12,901 [8] INFO Database - Database connected
2024-02-16 09:15:13,012 [8] WARN SystemCheck - Low disk space
2024-02-16 09:15:14,123 [8] ERROR FileSave - Failed to save file due to disk quota exceeded
2024-02-16 09:15:15,234 [8] INFO UserAuth - User login attempt
2024-02-16 09:15:16,345 [8] INFO UserAuth - User logged in successfully
2024-02-16 09:15:17,456 [8] DEBUG SessionManager - Session started for user: User123
2024-02-16 09:15:18,567 [8] WARN SessionManager - User session already active
2024-02-16 09:15:19,678 [8] INFO HealthCheck - Application health check OK
2024-02-16 09:15:20,789 [8] INFO Root - Application End
layout = "${longdate} ${uppercase:${level}} ${message:withexception=true}"2024-02-16 09:15:01.1231 INFO Application Start
2024-02-16 09:15:03.4562 DEBUG Loading modules
2024-02-16 09:15:04.7893 INFO Module A initialized
2024-02-16 09:15:05.0124 DEBUG Module B initialization started
2024-02-16 09:15:05.2345 INFO Module B initialized
2024-02-16 09:15:06.3456 WARN Module C is deprecated
2024-02-16 09:15:07.4567 INFO Module C initialized anyway
2024-02-16 09:15:08.5678 DEBUG Attempting connection to database
2024-02-16 09:15:09.6789 ERROR Database connection failed
2024-02-16 09:15:10.7891 INFO Retrying database connection
2024-02-16 09:15:11.8902 DEBUG Database connection attempt 2
2024-02-16 09:15:12.9013 INFO Database connected
2024-02-16 09:15:13.0124 WARN Low disk space
2024-02-16 09:15:14.1235 ERROR Failed to save file
2024-02-16 09:15:15.2346 INFO User login attempt
2024-02-16 09:15:16.3457 INFO User logged in successfully
2024-02-16 09:15:17.4568 DEBUG Session started for user
2024-02-16 09:15:18.5679 WARN User session already active
2024-02-16 09:15:19.6781 INFO Application health check OK
2024-02-16 09:15:20.7892 INFO Application End
layout = "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message}{NewLine}{Exception}"2024-02-16 09:15:01.123 [INF] Application Start
2024-02-16 09:15:03.456 [DBG] Loading modules
2024-02-16 09:15:04.789 [INF] Module A initialized
2024-02-16 09:15:05.012 [DBG] Module B initialization started
2024-02-16 09:15:05.234 [INF] Module B initialized
2024-02-16 09:15:06.345 [WRN] Module C is deprecated
2024-02-16 09:15:07.456 [INF] Module C initialized anyway
2024-02-16 09:15:08.567 [DBG] Attempting connection to database
2024-02-16 09:15:09.678 [ERR] Database connection failed: "Connection timeout"
2024-02-16 09:15:10.789 [INF] Retrying database connection
2024-02-16 09:15:11.890 [DBG] Database connection attempt 2
2024-02-16 09:15:12.901 [INF] Database connected
2024-02-16 09:15:13.012 [WRN] Low disk space
2024-02-16 09:15:14.123 [ERR] Failed to save file: "Disk quota exceeded"
2024-02-16 09:15:15.234 [INF] User login attempt
2024-02-16 09:15:16.345 [INF] User logged in successfully
2024-02-16 09:15:17.456 [DBG] Session started for user: "User123"
2024-02-16 09:15:18.567 [WRN] User session already active
2024-02-16 09:15:19.678 [INF] Application health check OK
2024-02-16 09:15:20.789 [INF] Application End
| Ilogger | Serilog |
|---|---|
| Trace | Verbose |
| Debug | Debug |
| Information | Information |
| Warning | Warning |
| Error | Error |
| Critical | Fatal |
| None | None |
Note: Log-level
TracevsVerboseandCriticalvsFatal.