When comparing Splunk vs Appenlight, the Slant community recommends Splunk for most people. In the question“What are the best log management, aggregation & monitoring tools?” Splunk is ranked 8th while Appenlight is ranked 22nd. The most important reason people chose Splunk is:
It's human readable, intuitive, fast and with auto-complete to boot. And if you need more advanced functionality out of your queries, [120+ page search manual](http://docs.splunk.com/index.php?title=Documentation:Splunk:Search:Whatsinthismanual:6.0beta&action=pdfbook) will give you an insight in how much is actually possible.
Ranked in these QuestionsQuestion Ranking
Pro Easy to use, powerful search
It's human readable, intuitive, fast and with auto-complete to boot. And if you need more advanced functionality out of your queries, 120+ page search manual will give you an insight in how much is actually possible.
Pro Widely used
De facto standard for log aggregation, monitoring, analysis and reporting.
Pro Scales effortlessly
It is built for enterprise use, meaning it scales easily.
Pro Real-time graphs
You can create visualizations that update in real time.
OS X, Linux & Windows are supported. You can also access Splunk from iOS and Android devices.
Pro Free version
With restrictions on log size and devices a free version is available.
Splunk can turn searches into alerts.
Pro Understands data in any format or language
Pro Extendable via a large selection of apps
Additional functionality can be added with over 500 apps.
Pro Log events system
It's possible to trigger events on certain logs. For example log.error happens, or failed password text is found in logs
Pro Error reporting
Pro Scales for Enterprises
Multi-node elasticsearch and scalable architecture easily supports 10000s+ of events/min
Pro Custom log Dashboards
Plot any type of graphs and aggregation with an easy to use composer.
Splunk is pretty expensive compared to other solutions.
The interface and service are very antiquated
Con Seriously SLOW ingest
Their docs and sales say it will ingest up to 20k EPS, but reality is more like 1k eps per server.