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

Core Flat - Free

Crutch

Core Gradient - Free

Core Line - Free

Core Neon - Free

Core Duo - Free

Core Solid - Free

Core Pop - Free

Core Remix - Free

Guidance – Free

Accessibility

Sharp Flat - Free

Core Flat

Disability

Core Line

Sharp Line - Streamline Material

Social

Outlined Line - Streamline Material

Micro Solid

Micro Line

Plump Line

Rounded Line - Streamline Material

Core Solid

Core Neon

Core Duo

Core Gradient

Core Pop

Core Remix

Cyber Line

Crutch 1

Cyber Duotone

Crutch 2

Sharp Pop - Free

Sharp Flat

Sharp Duo - Free

Sharp Remix

Sharp Neon

Sharp Pop

Sharp Duo

Sharp Gradient

Sharp Remix - Free

Sharp Solid

Sharp Line - Free

Sharp Gradient- Free

Sharp Solid - Free

Sharp Line

Sharp Neon - Free

Plump Neon

Plump Solid

Plump Gradient

Plump Remix

Plump Duo

Plump Flat

Plump Pop

<p>Flex is a fluid icon family inspired by nature's curves. It replaces rigid geometry with smooth, flowing forms. The Line variant features elegant strokes with organic curves.</p>

Flex Line

**Summary**: Flex's most refined sub-style — 1px continuously curving organic stroke on a 14px grid, the most visually elegant line icon available, suited to consumer and lifestyle products where icons should feel modern and naturally fluid. Flowing nature-inspired paths communicate organic forms rather than systematic grids. The tone signals refined motion: "we are in flow." Best for health, wellness, and lifestyle apps where organic visual language mirrors product values; personal finance and fintech wanting a human register; and creative tools where visual craft matters; best deployed at 24px+ where the organic curve quality is fully visible.

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

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## Fit & Recommendation

### Primary use cases

- Consumer products where the visual language should feel modern and naturally elegant
- Health, wellness, and lifestyle apps where organic visual language mirrors product values
- Personal finance and fintech products that want to feel human and approachable
- Creative and design-adjacent tools where visual craft matters
- Products with generous spacing and large icon display sizes (24px+)
- Navigation where icons should complement illustration or photography, not compete

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## Brand & Cultural Identity

### What it communicates

> "We are refined and in motion."

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## Visual & Technical Specs

### Visual properties

| Property | Value |
|----------|-------|
| Stroke weight | 1px |
| Fill | None |
| Corner treatment | Smooth fluid curves throughout — no geometric corners anywhere |
| Color | Monochrome |

### Emotional Scores

Flex Line is one of the warmer sub-styles in the catalog — organic flowing curves create warmth, though the 1px weight and cool monochrome colour slightly offset this. It is among the softest sub-styles in the catalog — the 1px stroke with continuously flowing curves is among the softest line constructions possible. It is one of the friendlier sub-styles in the catalog — organic curves lean friendly, with the refined thinness of the stroke pulling slightly toward elegance. It is one of the more playful sub-styles in the catalog in a considered way — flowing organic curves are fluid and refined rather than casual, sitting on the friendlier side of the midpoint. On its human↔mechanical character, it is one of the most human-feeling sub-styles in the catalog — nature-inspired curves communicate flowing organic forms, not systematic grids.

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## Pairing & Compatibility

### Typography pairing

- **Primary**: Plus Jakarta Sans — humanist warmth with subtle stroke contrast; shares the organic flowing quality
- **Alternative**: Outfit — clean humanist, modern; flowing curves sit naturally alongside
- **Editorial**: Libre Baskerville Light — for lifestyle contexts, serif stroke contrast echoes organic curve variation
- **Body**: Inter Regular — universal readable body, steps back to let Flex Line lead
- **Avoid**: IBM Plex Sans, Neue Haas Grotesk, cold monolinear grotesque — perfectly constructed geometric letters fight the organic language


<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

Crutch icon - Flex Line Set

Download Crutch SVG vector or transparent PNG icon in Line, Stroke style(s) for Sketch and Figma. It belongs to Flex Line vectors SVG collection.