SnapSilo's SwiftUI layout: LazyVGrid adaptive columns outperform List for image grids

This review analyzes SnapSilo's SwiftUI layout evolution, comparing List against LazyVGrid with fixed and adaptive columns, focusing on performance and responsiveness for visual content.

The Answer Up Front

For SwiftUI applications displaying a grid of visual content, particularly screenshots or images, LazyVGrid with adaptive columns is the superior choice. It offers significant performance benefits over List and handles diverse screen sizes and orientations more gracefully than LazyVGrid with fixed columns. Developers building image-heavy apps should prioritize LazyVGrid(.adaptive) from the outset to avoid costly refactors and ensure a responsive, memory-efficient user experience. Skip List for visual grids; its single-column layout wastes space and hinders content discovery.

Methodology

This v0 review draws on the founder Efficient_Bat6894's published claims and code examples in a Reddit post from May 22, 2026. The source details three iterations of SwiftUI layout for the SnapSilo screenshot grid, including specific LazyVGrid initializations and a performance claim regarding memory usage. What's covered includes the founder's rationale for component choices, the technical trade-offs encountered, and the final implementation details. This review does not include independent performance benchmarks, long-term workflow assessments, or edge-case testing beyond what the founder described. Update cadence: re-tested when claims diverge from observed behavior.

• Tool name + version + date observed: SnapSilo (App Store linked, specific version not stated), SwiftUI layout components (List, LazyVGrid), observed May 22, 2026.
• Source signal URL: https://www.reddit.com/r/SideProject/comments/1tksu2b/lazyvgrid_vs_list_which_one_i_chose_for_snapsilos/
• What's covered in this review: Founder's claims regarding layout choices, code snippets for LazyVGrid configurations, and a reported memory performance comparison.
• What's NOT covered: Independent performance metrics, detailed UI/UX analysis of SnapSilo, or long-term maintenance implications of the chosen layout.

What It Does

Initial List implementation

The SnapSilo founder initially implemented the screenshot grid using SwiftUI's List component. This approach displayed one screenshot per row, utilizing a thumbnail. While simple to implement, the founder noted it felt visually inefficient, wasting horizontal space and making it cumbersome to scroll through a large collection of 200 screenshots due to the small thumbnails.

Fixed-column LazyVGrid

The second iteration moved to LazyVGrid with a fixed number of columns, explicitly defined using GridItem(.fixed(itemWidth)). This provided a visually improved, multi-column layout, allowing screenshots more space. However, this method required manual calculation of itemWidth based on UIScreen.main.bounds.width. This hardcoded approach failed to adapt correctly to varying screen sizes, such as iPads, different iPhone models, or split-view multitasking, leading to layout breakage.

Adaptive-column LazyVGrid

The final and chosen approach for SnapSilo's screenshot grid is LazyVGrid with adaptive columns. This configuration, using GridItem(.adaptive(minimum: 110, maximum: 150)), automatically fills the available width. The founder reports this setup dynamically adjusts the number of columns and cell widths based on the device and orientation. For example, an iPhone SE displays 3 columns, an iPhone Pro Max shows 3 wider columns, and an iPad renders 5-6 columns, all without manual width calculations.

Maintaining scroll position

A specific challenge addressed was maintaining the scroll position after a user taps a screenshot to view it full-screen and then dismisses the sheet. The founder solved this by tracking the selected item's ID and using scrollTo on a ScrollViewReader proxy, ensuring the previously selected item remains in view upon returning to the grid.

What's Interesting / What's Not

The most interesting aspect of this review is the founder's clear, iterative progression from a suboptimal SwiftUI component (List) to a highly effective one (LazyVGrid with adaptive columns) for a specific use case: displaying a grid of visual content. The explicit rejection of List for image grids, citing wasted horizontal space and poor user experience, is a valuable lesson for SwiftUI developers. The GridItem(.adaptive) configuration is a powerful, often underutilized feature that simplifies responsive layout significantly, eliminating the need for complex geometry readers or UIScreen calculations that often fail in dynamic environments like split view.

The reported performance benefit is also notable. The founder claims that LazyVGrid, by rendering only visible cells, achieved

The investor read

The detailed account of SnapSilo's SwiftUI layout evolution signals a broader trend in mobile development: the increasing maturity and adoption of declarative UI frameworks like SwiftUI. Founders are prioritizing native, performant user experiences, and the choice of correct layout components directly impacts memory footprint and responsiveness. This focus on core UX, even for indie projects, indicates a market where users expect high-quality interactions. Tools that simplify responsive design and optimize performance within these frameworks, or provide robust benchmarking, will see continued demand. While SnapSilo itself is an application, the founder's insights highlight the value of deep technical understanding in a competitive app market. A company providing advanced SwiftUI layout tools or performance diagnostics could be investable, especially if it offers verifiable benchmarks or simplifies complex adaptive layouts for developers.