It's not too hard to verify my central claim here which is that we're giving away what they charge money for. Their serialization format is secret, proprietary. Ours, CSTML, is open: https://docs.bablr.org/guides/cstml. Their free product make you re-parse the entire project with every code change you make. Ours is built with copy-on-write immutable data structures so that you can always build new things without losing old ones. Our way you can compose fragments of trees together with new code into new trees like you're playing with lego bricks.