If you want a tool to help you understand your code's time complexity and optimize its performance, Figstack is a great option. It's got a specific feature to estimate code performance using Big O notation that'll help you optimize your code for better performance. Figstack also has tools to explain code in natural language, translate code from one programming language to another, and create detailed documentation for your functions.
Another powerful option is TimeComplexity.ai. The tool uses AI technology to analyze the runtime complexity of your program, giving you a better idea of how well it'll perform as input sizes grow. It supports several programming languages and has a variety of pricing tiers, including a free option with 20 queries per day. The tool can handle incomplete code, too, so it's good for a wide range of coding situations.
For a full-fledged developer tool, check out Kodezi. It's got general code correction, debugging and optimization abilities, but it also can optimize code in more than 30 programming languages. The tool can help you work more efficiently by keeping your code professional and explaining what's going on when you're debugging.
If you're more focused on database performance, EverSQL might be for you. It's designed to optimize PostgreSQL and MySQL database performance by constantly monitoring and optimizing SQL queries in real time. The tool can save you a lot of time trying to optimize your database manually, so your database runs more smoothly.