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Not trying to break your party, but GrayLog2 solves all those problems. Most businesses/startups do not need well marketed DataDog or Logtail.

Free, fast, versatile, adaptable to almost every case

http://graylog2.org/ takes me to graylog.org whose pricing is not free and not cheap.

Your company?

Anyway - not a "competitor" to the genuinely free and open-source Swatchdog.

You may want to look a bit deeper than pricing page. And no, it's not my company.

Not sure what "genuinely free" means.