I recently discovered a free & easy-to-use online tool for power analysis & sample size planning in confirmatory factor analysis (CFA) and structural equation modeling (SEM). It's called pwrSEM, and you can find it here:

https://yilinandrewang.shinyapps.io/pwrSEM/

Check out my Youtube tutorial on how to use this app:

https://www.youtube.com/watch?v=98d-Bt3aTgU

Reference

Article Power Analysis for Parameter Estimation in Structural Equati...