Open-Source Observability · SergiusTheBest

plog

Plog is a lightweight, header-only C++ logging library designed for simplicity and cross-platform compatibility. It provides multiple output targets (files, console, Android, Windows Event Log) and formatters (TXT, CSV) with minimal code footprint and zero external dependencies.

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Source: GitHub — github.com/SergiusTheBest/plog

2.6k

GitHub stars

406

Forks

C++

Primary language

MIT

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	SergiusTheBest/plog
Owner	SergiusTheBest
Primary language	C++
License	MIT — OSI-approved
Stars	2.6k
Forks	406
Open issues	56
Latest release	1.1.11 (2025-08-10)
Last updated	2026-01-20
Source	https://github.com/SergiusTheBest/plog

What plog is

A ~1000 LOC header-only C++ logging library supporting thread-safe logging, lazy stream evaluation, multiple appenders and formatters, and optional UTF-8 conversion. No C++11 requirement; compiles on Windows, Linux, macOS, Android, FreeBSD, and embedded platforms (RTEMS, FreeRTOS).

Quickstart

Get the plog source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/SergiusTheBest/plog.git2cd plog3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Embedded and Resource-Constrained Systems

Header-only, minimal footprint (~1000 LOC), no dependencies, and support for RTEMS/FreeRTOS make it ideal for firmware and embedded C++ applications where code size and simplicity matter.

Cross-Platform Desktop and Server Applications

Native support for Windows Event Log, colored console output, rolling file appenders, and proven compilation on MSVC, GCC, Clang across Windows, Linux, and macOS simplify multi-platform deployments.

Legacy C++ Codebases and Pre-C++11 Projects

Explicitly does not require C++11, making adoption straightforward in older codebases where upgrading the language standard is infeasible or undesirable.

Implementation considerations

Header-only integration: simply add `plog/include` to your include path; no separate build or linking step required. CMake `add_subdirectory` and FetchContent are also well-documented.
Initialization is mandatory before logging (Step 2 in docs); forgetting to call `plog::init()` will result in silent or no-op log statements.
Thread safety is claimed but not backed by detailed documentation or test examples; verify under your target concurrency model and load profile.
Macro-based logging (`PLOGD`, `LOG_DEBUG`) can conflict with macros from other libraries; namespace collision potential is acknowledged in docs with mitigation notes.
No built-in async appenders; all appending is synchronous and blocking. High-frequency logging may stall the calling thread.

When to avoid it — and what to weigh

High-Volume, Ultra-Low-Latency Logging — No documented performance benchmarks provided. If sub-microsecond latency or handling millions of messages/sec is required, evaluate competitors with published performance data and async-only appenders.
Structured Logging and Complex Observability — Plog focuses on human-readable formats (TXT, CSV). Modern structured logging (JSON fields, trace IDs, baggage) and deep integration with centralized log aggregation platforms are not evident in the feature set.
Runtime Sink/Appender Discovery or Plugin Architecture — While custom appenders are extensible, dynamic appender registration at runtime appears limited. Projects requiring plugin-loaded sinks or hot-swappable backends should review the DynamicAppender implementation first.
Non-C++ Ecosystems or Polyglot Services — Plog is C++-only; there is no native binding or SDKs for Python, Go, Java, or other languages. If your stack is polyglot, a dedicated log aggregation service (e.g., ELK, Datadog) is more pragmatic.

License & commercial use

Licensed under MIT (MIT License), a permissive OSI-approved license. Permits modification, distribution, and private/commercial use with no warranty. Requires only preservation of license and copyright notices.

MIT is a permissive OSI license explicitly permitting commercial use, modification, and redistribution. No commercial license key, registration, or vendor permission required. Suitable for proprietary and closed-source commercial products. However, always consult legal counsel for your specific jurisdiction and use case to confirm compliance with license obligations.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Strong
License clarity	Clear
Deployment complexity	Low
DEV.co fit	Strong
Assessment confidence	High

Security considerations

No explicit security audit, vulnerability disclosure policy, or security-focused documentation provided. Standard logging considerations apply: ensure log output does not leak sensitive data (passwords, tokens, PII); if logging untrusted input, verify format strings and buffer handling to avoid injection. Header-only design allows static analysis and code review of the full implementation. No external dependencies reduce supply-chain risk. Recommend code review before use in security-critical or high-assurance applications.

Alternatives to consider

spdlog

Modern C++11-based async logging library with better performance benchmarks, structured logging support, and broader ecosystem integration. Heavier footprint; not suitable for pre-C++11 or ultra-constrained embedded systems.

Boost.Log

Part of Boost; mature and feature-rich with advanced filtering, record attributes, and sink chaining. Requires Boost dependency and C++11. Steeper learning curve; overkill for simple use cases.

Log4cplus

Long-standing C++ port of Log4j; hierarchical logging, configuration files, and broad appender support. Standalone library (not header-only); requires compilation and linking. More heavyweight than plog but proven in large enterprises.

Software development agency

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plog FAQ

Is plog thread-safe?

Documentation claims thread safety, but detailed guarantees (lock granularity, atomic operations, lock-free characteristics) are not documented. Recommended: test under your target concurrency model and review source code if targeting high-contention scenarios.

Can I use plog in a shared library (DLL/SO)?

Yes. README explicitly covers 'Share log instances across modules (exe, dll, so, dylib)' in advanced usage. Consult that section for correct initialization and linker setup.

Does plog support async logging?

Not built-in. All appending is synchronous and blocking. If sub-millisecond latency is critical, consider async wrappers or competing libraries like spdlog with async_factory.

What C++ standards does plog support?

Explicitly supports pre-C++11 standards. No modern C++ features (lambdas, move semantics, etc.) required. Compiles on older toolchains (MSVC 6.0, legacy GCC) but also works with modern C++17/20 compilers.

Software development & web development with DEV.co

From first prototype to production, DEV.co delivers software development services around tools like plog. Our software development agency staffs experienced software developers and web developers for custom software development, web development, integrations, and ongoing support across open-source observability and beyond.

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