What is the best app for drawing perspective?

There are several apps available for drawing perspective, each with its own unique features and benefits. Some of the popular ones include:

SketchUp: 

SketchUp is a powerful 3D modeling app that includes tools for drawing perspective. Its features include the ability to draw in 2D or 3D, create precise measurements, and import and export files in a variety of formats. SketchUp offers a free version as well as a pro version, which costs $299 per year.

Procreate: 

Procreate is a digital painting app that includes a perspective grid tool, making it ideal for artists and designers. Its features include customizable brushes, layers, and the ability to export files in a variety of formats. Procreate is only available for iOS devices and costs $9.99 to purchase.

Adobe Illustrator: 

Adobe Illustrator is a vector graphics editor that includes tools for drawing perspective. Its features include customizable grids, the ability to create precise measurements, and the ability to export files in a variety of formats. Adobe Illustrator is available as part of the Adobe Creative Cloud subscription service, which costs $20.99 per month.

Concepts: 

Concepts is a vector-based sketching app that includes a perspective guide tool, making it ideal for creating architectural and technical drawings. Its features include customizable brushes, layers, and the ability to export files in a variety of formats. Concepts offer a free version as well as a pro version, which costs $8.99 per month or $59.99 per year.

The exact workings of each app will vary depending on the specific features and tools it offers. In general, perspective drawing apps will include tools for creating grids, measuring angles and distances, and adjusting the placement of objects in a 3D space.

The cost of purchasing these apps or software online will also vary depending on the specific product and licensing model. Some apps offer a one-time purchase fee, while others require a subscription or ongoing licensing fee. It's important to research and compares different options to determine which one best suits your needs and budget.