Yes, both Hex.tech and Feynman offer a Free Trial.
Pricing for Hex.tech Starts at $36/month whereas for Feynman Starts at $24.99/month.
Hex.tech offers several advantages, including Assists within SQL and Python, Understands schemas and context, Auto-completes SQL joins, Generates complex date filters, Streamlines query writing and many more functionalities.
The cons of Hex.tech may include a Public beta: stability issues, Limited to SQL, Python, R. and No mention of mobile support