I've never used this but upon online research, their services are paid but they don't offer their price listing online. I guess that's so they can provide you with a personal offer based on your situation. It's not an uncommon practice - other companies do it too. I guess you can email them for an offer with the specific needs you have and they'll reach out to you and offer you the prices of their services. I find that a little inconvenient but I guess that's their strategy. If you're looking specifically for a free Oracle solution, by the way, then their LogMiner tool is your answer.
No, it's not free but you can benefit from a free trial, though. There's an option to try their platform for a limited amount of time, so that may be useful to help you decide if you want to continue with them, or not. Additionally, they provide a demo, based on the specifics of your case, which is also convenient. I'm not sure what the price of their services is at the moment, as I don't work at an organization that uses them anymore, but after the demo and/or free trial, you can contact them for further information and I'm sure they'll respond with details.
You'd want to use the Equalium Oracle Binary Log Parser because it's just better than the LogMiner. Sure, LogMiner is made by Oracle and probably the team knows some insight to make it efficient that outside companies and tools don't, but in reality, it's got its issues. LogMiner wasn't built to analyze massive amounts of changes, and when Oracle introduced its version 19c, things just got complicated. Like literally, the load increased, LogMiner slowed, and we can speak of overload for sure. The solution that Equalum provided fixes the problems that Oracle created for itself, and it does it in a very good way. That's why you should consider it over the native tool of the database, in my humble opinion.
Basically, if you want to make your life easier, you'd use Equalum and not Logminer. And what's more, you could use Logminer if you wanted to through Equalum. What happens is you're given a tool that integrates seamlessly through all Oracle databases and it works very fast for data replication while providing good results. The Equalum tool gives you different features and handles larger workloads of databases than Logminer or competitors. That's a good reason on its own, but you can also replicate data using this tool through Logminer, except that by using Equalum be avoiding the 19c issues of Oracle.