# Aspect Ratio Pro > Aspect Ratio Pro, or the Rule of Thirds, is a well-crafted tool for calculating screen sizes of various aspect ratios across different pixel canvas sizes. Canonical page: https://nested.blog/awesome/apps/aspect-ratio-pro Content type: software profile Creator: App ahead GmbH Category: Graphics & Design Platforms: macOS, iOS, iPadOS Pricing: one_time Editorial grade: Great (84/100) Added: 2026-04-26T19:53:59.157Z This is the agent-readable representation of the application profile on The Shortlist. ## Why nested.blog recommends it Official website: https://apps.apple.com/us/app/aspect-ratio-pro/id6747417099 ## Related Shortlist guides - [Small, but Indispensable](https://nested.blog/agents/small-but-indispensable.txt): Small tools that solve real problems so well that working without them soon feels strangely inefficient. Shared context: [agent context](https://nested.blog/agents/context.txt) ยท [component semantics](https://nested.blog/agents/components.txt)