Graylog vs. Splunk

Graylog is ranked 6th in Log Management with 7 reviews vs Splunk which is ranked 1st in Log Management with 55 reviews. The top reviewer of Graylog writes "Provides the ability to write custom alerts, which are key to information security and compliance". The top reviewer of Splunk writes "Monitors all machine logins and actions taken on those machines under each user". Graylog is most compared with ELK Logstash, Splunk and AlienVault. Splunk is most compared with IBM QRadar, LogRhythm NextGen SIEM and ArcSight. See our Graylog vs. Splunk report.
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JasonCrow
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Quotes From Members Comparing Graylog vs. Splunk

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
Pros
Real-time UDP/GELF logging and full text-based searching.UDP is a fast and lightweight protocol, perfect for sending large volumes of logs with minimal overhead.Storing logs in Elasticsearch means log retrieval is extremely fast, and full text search is available by default.We run a containerized microservices environment. Being able to set up streams and search for errors and anomalies across hundreds of containers is why a log aggregation platform like Graylog is valuable to us.Allowing us to set up alerts and integrate with platforms we already use, such as Slack and OpsGenie to alert users of these errors proactively, is also a very useful feature.It is used as a log manager/SIEM. It provides visibility into the infrastructure and security related events.The build is stable and requires little maintenance, even compared to some extremely expensive products.We have scaled from a single machine installation (a VM with a Graylog + ES + MongoDB) to (2 Graylog + 2 ES + 3 MongoDB). This was done smoothly with a minimal impact on logging.

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It provides logs in one place, so they are easy to find. It collects the logs from multiple places, then you have just one place where you see the whole flow from the front-end to the back-end.It has a big user base, so the community is useful.The stock analysts and security people use one single dashboard (one single location) to check our logs.It scales better in the cloud than on-premise.It has helped us look at modern technology, as well as penetrate our legacy systems, to see where the bottlenecks are.The product is adept at log mining.The client site login is pretty extensible and probably cost-effective.It is very stable. We have not had any problems.

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Cons
More complex visualizations and the ability to execute custom Elasticsearch queries would be great.With technical support, you are on your own without an enterprise license.Elasticsearch recommendations for tuning could be better. Graylog doesn't have direct support for running the system inside of Kubernetes, so it can be challenging to fill in the gaps and set up containers in a way that is both performant and stable.We ran into problems with Elasticsearch throwing a circuit-breaking exception due to field data size being too large. It turned out that the heap size directly impacted this size in a high-throughput environment, causing unexplained instability in Graylog. We were able to troubleshoot on the Elasticsearch size, but we should have been able to reference some minimum requirements for Graylog to know that our settings weren't sufficient.Since container orchestration systems are popular and Graylog fits the niche well, perhaps they could officially support running in docker containers on Kubernetes as a StatefulSet as a use case. That way, the declarative nature of Kubernetes config files would document their best case deployment scenario-Dashboards, stream alerts and parsing could be improved.Over six months, I had two similar issues where searches were performed on field "messages". It exhausted all the memory of the ES node causing an ES crash and a Graylog halt.There should be some user groups and an auto sign-in feature.​

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The search could be improved. Now, it is a bit difficult to write search queries because they become quite long, then maintaining those long search queries is a quite challenging.The integration with all our tool sets felt like we were reinventing the wheel, which was a pain point for us.We would like more integrations with other cloud products, not just AWS, e.g., Azure.There are new services which are coming up. If Splunk can catch up with the speed of Amazon, and with the integration, instead of us waiting for another year or so, that would be good.If it could be made available as a service, this would be much better than as a product.I would like some additional AI capabilities to provide additional information about things going wrong and things going well.I would like to see ability to master management. In terms of clustering, how it manages clustering needs improvement.We had an instance when Splunk failed and it took us a couple of days to recover.

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Pricing and Cost Advice
​You get a lot out-of-the-box with the non-enterprise version, so give it a try first.Consider Enterprise support if you have atypical needs or setup requirements.​If you want something that works and do not have the money for Splunk or QRadar, take Graylog.​​I am using a community edition. I have not looked at the enterprise offering from Graylog.Having paid official support is wise for projects.

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It would be nice if the pricing were cheaper. However, we did purchase it.Splunk is not free.We have seen ROI and improvements as we have continued to use the product, but they are more reactive.I assume that the pricing is reasonable, because if it was too costly, there are other alternatives.I have no opinion on pricing.It is possible to use a developer's license, which is up to 10GB per day of volume traffic, which is usually enough for most use cases.Free Splunk license for PoCs on personal machines and the ability to scale the PoC to an enterprise level app.It can be expensive, especially the licensing costs. However, there is added value in what it can do, not just log aggregation.

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8.4
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In Log Management
Top Comparisons
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Compared 29% of the time.
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Overview

Splunk software has been around since 2006 and the company has since grown to become an industry leader. Splunk's vision is to make machine data accessible, usable and valuable to everybody. The company offers a wide range of products to turn machine data into valuable information by monitoring and analyzing all activities. This is known as Operational Intelligence and is the unique value proposition of Splunk.

Splunk is well-known for its Log Management capabilities and also for its Security Information and Event Management (SIEM) solutions.

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Sample Customers
Blue Cross Blue Shield, eBay, Cisco, LinkedIn, SAP, King.com, Twilio, Deutsche Presse-AgenturSplunk has more than 7,000 customers spread across over 90 countries. These customers include Telenor, UniCredit, ideeli, McKenney's, Tesco, and SurveyMonkey.
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