Viable Fit - Measure and improve your product market fit
Start on Android by Google - Developer program to optimize your app before you launch
Product Fit - Measure product/market fit in app with your users.
Visage - Visage is a new platform that enables non-designers to easily create beautiful, on-brand visual content such as data visualization, reports & much more
Product/Market Fit Survey - Check how close your product is to Product/Market fit
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.