Comparison

Logly is a high-performance logging library with a Rust-native engine. It provides a clean Python API with built-in levels, flexible sinks, rotation, compression, structured output, and framework integrations.

Feature Matrix

Capability	Logly	Other Python API	structlog	stdlib logging
Engine	Rust (PyO3)	Pure Python	Pure Python	Pure Python
10 built-in levels	Yes	Partial	No	No
Custom levels	Yes	Yes	No	Manual
Multiple sinks	Yes	Yes	No	Yes
JSON serialization	Yes	Yes	Yes	Formatter dependent
Pretty JSON	Yes	Custom formatter	Yes	Formatter dependent
Custom format strings	Yes	Yes	No	Formatter dependent
Callable formatting	Yes	Yes	Processor based	Formatter based
Level filtering	Yes	Yes	No	Yes
Callable filtering	Yes	Yes	Processor based	Filter based
Context binding	Yes	Yes	Yes	Adapter based
Scoped context	Yes	Yes	Contextvars processors	No
Record patching	Yes	Yes	Processor based	No
Exception catching	Yes	Yes	No	No
File rotation	Yes	Yes	No	Handler dependent
Retention	Yes	Yes	No	Handler dependent
Compression	Yes	Yes	No	Handler dependent
Background workers	Yes	Yes	No	QueueHandler
HTTP logging	Yes	Custom sink	No	No
TCP/UDP logging	Yes	Custom sink	No	SocketHandler
Syslog	Yes	Custom sink	No	SysLogHandler
FastAPI integration	Yes	Community/manual	No	No
Django integration	Yes	Community/manual	No	DictConfig
Flask integration	Yes	Community/manual	No	Manual
Rich console	Yes	Yes	No	Manual
OpenTelemetry	Yes	Custom sink	Processor based	Manual
Prometheus	Yes	Custom sink	No	Manual
Pydantic config	Yes	No	No	No
Type stubs	Yes	Partial	Yes	No
Zero unsafe Rust	Yes	N/A	N/A	N/A

Migration Pattern

Start by configuring sinks explicitly at startup, then pass logger or independent Logger() instances into the components that need logging.

Migrating From Other Logging Libraries

Most day-to-day calls are intentionally familiar:

from logly import logger

logger.add("app.log", rotation="10 MB", retention="7 days", compression="gzip")
logger.bind(request_id="req-123").info("request accepted")

Use Logger() for independent sink sets:

from logly import Logger

api_logger = Logger()
worker_logger = Logger()

api_logger.add("api.log")
worker_logger.add("worker.log")