Building a Consistent Icon System for a Product Suite

smplkit has fifteen products. Each one needs an icon that works at every size: the navigation flyout, the product page header, the sidebar in the developer console, marketing materials, and eventually mobile app icons and favicons.

When you have one product, you can hand-craft an icon and move on. When you have fifteen, you need a system.

Why Systems Matter

Imagine browsing a developer platform’s product catalog and each product icon is a different style — one is a filled glyph, another is a thin outline, a third is a detailed illustration, and a fourth is a photograph. The visual noise would undermine the impression of a cohesive platform.

Developer platforms that feel premium — Stripe, Linear, Vercel — share a characteristic: visual consistency at every level of detail. Their icons, their typography, their spacing, their color usage all follow a system. This isn’t about aesthetics for aesthetics’ sake. It’s a trust signal. Consistency implies deliberate design, which implies engineering quality. Inconsistency implies ad hoc decisions, which implies the product might be ad hoc too.

The smplkit Icon Conventions

Every smplkit product icon follows these rules:

Monochrome line icons. No fills, no gradients, no multiple colors. Each icon is a set of strokes on a transparent background. This keeps them legible at small sizes and allows CSS to control the color contextually — the same icon can be white on a dark background, orange when hovered, or gray when disabled, all without swapping assets.

Thin rounded square container. Every icon sits inside an identical rounded-square boundary. This creates a uniform silhouette in grid layouts (the navigation flyout, the product catalog) and ensures no icon is visually larger or heavier than its neighbors.

SVG format. SVGs scale infinitely, have tiny file sizes, and can be styled with CSS. There is no reason to use raster images for UI icons in 2026. A PNG icon that looks sharp at 32px looks blurry at 64px on a Retina display. An SVG looks perfect at any size.

Shared geometry rules. All icons use the same stroke width, corner radius, and padding within the container. This means you can place any two icons side by side and they look like they belong together, even if the subjects are completely different (a bell for Alerts, a key for Secrets, a gear for Config).

Designing for Fifteen Products

The hardest part of an icon system isn’t making one good icon. It’s making fifteen icons that are all visually distinct while following the same rules.

Each icon needs to communicate what the product does at a glance. Smpl Config gets a gear with adjustment lines. Smpl Flags gets a flag. Smpl Secrets gets a key. These are familiar metaphors that don’t require explanation.

Some products are harder. What does “Smpl Events” look like? A lightning bolt (implies speed, not events). A calendar (implies scheduling, not event bus). A branching arrow (implies routing — close enough). “Smpl Tenants” is even harder — we went with a building silhouette, which maps to “multi-tenant” in the SaaS context without being too literal.

The constraint of monochrome line art actually helps here. When you can’t rely on color or fills to differentiate icons, you’re forced to make the subject and geometry do the work. This produces clearer icons because the essential form has to carry the meaning.

Small-Size Legibility

Icons in a navigation flyout render at about 20px. At that size, detail vanishes. Lines that are too close together merge. Curves that are too subtle become straight lines. Negative space that works at 64px collapses at 20px.

This is why the design rules exist. A consistent stroke width means no icon has lines that are too thin to see at small sizes. A minimum spacing between elements means no icon becomes an indistinct blob. The rounded-square container means every icon occupies the same footprint even when the subject varies in visual density.

We tested every icon at 20px, 32px, and 64px. If it wasn’t clear at 20px, we simplified until it was. The 64px version doesn’t need to be identical to the 20px version — it’s fine for larger renderings to include more detail — but the 20px version needs to be instantly recognizable.

CSS Color Control

Because the icons are SVG strokes with no hardcoded colors, we control their appearance entirely through CSS. This means one icon asset per product, not one-per-product-per-theme.

In the dark-themed navigation, icons are white. On hover, they pick up the orange accent color. In a hypothetical light theme, they’d be dark gray. Disabled products in the flyout get a muted color. All of this is CSS — the SVG file never changes.

This also future-proofs the icons for contexts we haven’t designed yet. If we add a mobile app with a different color scheme, or a partner integrations page with a specific visual treatment, the icons adapt without new assets.

The Investment

Designing an icon system for fifteen products took a few days. Each individual icon within the system took maybe an hour once the rules were established. Without the system, each icon would take longer because every one requires design decisions that the system already answers.

The system pays for itself almost immediately. When the sixteenth product ships, its icon takes an hour to design and fits perfectly alongside the others with zero visual integration work.

Each smplkit product icon follows a unified design system. Explore the full product suite at smplkit.com.