Principle is exclusively available for macOS, which means designers using Windows or Linux cannot use the tool. Additionally, prototypes can only be previewed on a Mac or iPhone, making it impossible to share interactive prototypes with team members on other platforms without exporting to video.

Principle has no ability to create assets inside the application. Editing capabilities are limited to basics like scale, rotate, and position. Designers must create all visual assets in external tools like Figma or Sketch first, then import them, creating a fragmented workflow.

Unlike modern design tools like Figma, Principle has no collaboration features. Designers cannot work together on the same prototype simultaneously. Sharing requires exporting files or videos, which breaks the rapid iteration cycle that modern design teams expect.

Principle excels at simple animations and transitions but lacks the ability to create complex interactions involving variables, conditional logic, or real data. Designers needing sophisticated prototypes with state management must switch to tools like ProtoPie or Framer.

When importing Sketch artboards, certain properties are not recognized by Principle and result in layers being imported as flattened images. This includes paths, fills, borders, blur effects, masks, and text layers. Designers must do additional work to reconstruct their designs or flatten groups manually.

Principle doesn't export to any development formats like CSS, Framer, Xcode, Android Studio, or React Native. This means developers cannot use the animation specifications directly and must manually recreate animations, leading to inconsistencies between prototype and production.

To export your documented process to anyone, you need a Principle license that hasn't expired or is still covered by the free trial period. Additionally, even with a valid license, you cannot export animation values, which is crucial for collaborating with development teams.

Multiple reviewers note that updates take a very long time to be released. The tool hasn't evolved significantly in years compared to competitors like Figma and ProtoPie, suggesting limited ongoing development investment. Users worry about the long-term viability of the platform.

Users report difficulty in mastering the software and a lack of proprietary content for assistance in learning. While there's a one-minute contextual introduction video, achieving complex interactions using only default solutions and tools is quite difficult without extensive experimentation.

Prototypes can only be previewed on a Mac or on an iPhone using the Principle Mirror app. There's no Android preview option, which is problematic for designers working on cross-platform apps or teams where Android testing is required.

While Principle has some community resources, the ecosystem is small compared to Figma's extensive plugin marketplace, community files, and support resources. Finding templates, tutorials, and third-party integrations is more difficult.

While Principle is sold as a one-time $129 purchase, the license only includes new features released within a year of purchase. To access features released after that year, users must pay for a license renewal, creating an unexpected ongoing cost.