Interface Essential

Business

Images Photography

Money Shopping

Programming

Computer Devices

Phone

Mail

Map Travel

Food Drink

Nature Ecology

Entertainment

Shipping

Culture

Health

Work Education

Artificial Intelligence

Arrows

Streamline 3.0

Ultimate

Core

Flex

Sharp

Plump

Micro

Freehand

Streamline Material

Nova

Cyber

Streamline Vault

Logos

Pixel

Google Material

Tabler

Remix

Feather

Iconoir

Carbon

Solar

Lucide

Brand Logos

Bootstrap

Atlas

Unicons

Ionic Icons

Phosphor

MingCute

Font Awesome

Majesticons

Mynaui

Radix

Heroicons

Flagpack

Guidance – Free

Smiley

Interface

Cyber Duotone - Free

Smiley Frown

Mail Chat Smiley

Core Duo

Smiley Emoticon Sad

Plump Line

Smiley Grumpy

Plump Flat

Smiley Excited

Smiley Emoticon Smile

Freehand Duotone

Smiley Lol

Smiley Cheeky

Plump Gradient

Smiley Blessed

Plump Solid

Smiley Sick

Smiley Sparks

Plump Neon

Smiley Happy

Smiley Smirk

Smiley Rich

Flex Solid

Smiley Worried

Ultimate Bold

Smileys

Ultimate Duotone

Smiley Unhappy

Ultimate Regular

Smiley Dizzy

Plump Flat - Free

Smiley Indiferent

Core Remix

Smiley Content

Core Pop

Smiley Calm

Core Line

Smiley Crying 1

Flex Remix

Smiley Cool

Sharp Remix

Smiley Wink

Sharp Solid

Sharp Line

Smiley Frustrated

Core Solid

Smiley Thrilled

Smiley Laughing 2

Smiley Pin 2

Pins

Smiley Decode

Core Remix - Free

Core Flat - Free

Smiley Drool

Core Solid - Free

Smiley Nauseas

Smiley Trouble

Sharp Solid - Free

Smiley Shocked

Ultimate Light - Free

Laptop Smiley 1

Computers Devices Electronics

Smiley Very Happy 1

Smiley Drop

<p>Flex is all about the curves. Its smooth curves brings fluidity and dynamism to your designs with a modern appeal.&nbsp;The Flat style is easy to integrate into projects that need icons with a more illustrative purpose, working best at larger sizes. All Flex Flat icons are designed on a 14px grid with two customizable colors.</p>

Flex Flat

**Summary**: Flex's illustrative sub-style — solid flat two-tone blue fills on fluid organic silhouettes, producing a more contemporary and natural-feeling flat illustration register than geometric flat sets. Fluid organic edges soften the flat fill quality, making this register warmer and more natural than Sharp Flat or Core Flat at equivalent blue tonal palette. The tone signals organic illustration: "we illustrate nature's geometry." Best for onboarding and product tour illustrations at display sizes, feature explainer content in modern consumer products, and marketing where organic silhouettes feel more contemporary than geometric flat alternatives.

**Last updated**: 2026-04-23

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## Fit & Recommendation

### Primary use cases

- Onboarding and product tour illustrations at display sizes
- Feature explainer and help content visuals
- Modern consumer product marketing where organic silhouettes feel more contemporary than geometric flats

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## Brand & Cultural Identity

### What it communicates

> "We illustrate nature's geometry."

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## Visual & Technical Specs

### Visual properties

| Property | Value |
|----------|-------|
| Stroke weight | None |
| Fill | Solid flat fills, two-tone |
| Corner treatment | Fluid organic silhouettes |
| Color | Dark blue + light blue tonal |

### Emotional Scores

Flex Flat is somewhat warm — the blue tonal system is cool, but organic silhouettes add warmth that geometric flat sets lack. It is one of the friendlier sub-styles in the catalog — flat fills on organic silhouettes produce flowing shape edges that soften the fill. It is one of the friendlier sub-styles in the catalog — the two-tone blue in organic shapes reads as modern and considered, with mild approachability. It is somewhat warm on playfulness — organic flat illustration reads as contemporary and considered rather than playful or severe. On its human↔mechanical character, it is one of the more human-feeling sub-styles in the catalog — fluid organic silhouettes read as natural forms, not diagrams.

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## Pairing & Compatibility

### Typography pairing

- **Primary**: Outfit — modern humanist, appropriate for the illustrative flat icon context
- **Alternative**: Plus Jakarta Sans — warm humanist, works in illustrative contexts
- **Body**: Inter Regular or DM Sans
- **Avoid**: Cold geometric or monospace fonts


<p>Flex is a fluid icon family inspired by nature’s curves. It favors smooth, flowing forms. More organic than Core and subtler than the chunky Plump. Read about the <a href="https://blog.streamlinehq.com/flex/" rel="noopener noreferrer" target="_blank">design process</a>.</p>

Fluid icons

Smiley Sick icon - Flex Flat Set

Download Smiley Sick SVG vector or transparent PNG icon in Flat style(s) for Sketch and Figma. It belongs to Flex Flat vectors SVG collection.