If you want a sandbox to try out different pool shapes and sizes, Pool Planner AI is a good choice. The system, which uses artificial intelligence to let people visualize their dream pool, offers more than 70 high-resolution pool designs in different shapes and sizes, including rectangles, rounds and freeform designs. After uploading a high-resolution photo of your yard, you can get a realistic visualization of different pool designs in less than an hour. That can give you the confidence to make decisions and avoid costly do-overs.
Another tool worth a look is Neighborbrite. It's geared more toward landscape design, but it uses AI to come up with design ideas based on a few prompts. It's not specifically designed for pool design, but it's free and easy to use for exploring different outdoor areas, and maybe it'll spark an idea for the right combination for your yard.
For a more general design exploration, Maket offers generative design software that automates the creation and customization of residential floorplans. It's not just for pools, but Maket gives you design freedom and regulatory peace of mind with zoning code compliance. The tool lets you quickly and easily explore different design options, which could lead you to a pool design that fits in well with your outdoor space.