Interface Essential

Computers Devices Electronics

Programming Apps Websites

Internet Networks Servers

Business Products

Work Office Companies

Money Payments Finance

Shopping Ecommerce

Shipping Delivery

Content

Design

Images Photography

Music Audio

Video Movies TV

Files Folders

Users

Emails

Phones Mobile Devices

Messages Chat Smileys

Social Medias Rewards Rating

Wayfinding

Food Drinks

Weather

Health Beauty

Science

Sports

Entertainment Events Hobbies

Transportation

Maps Navigation

Arrows Diagrams

Logos

Streamline 3.0

Ultimate

Core

Flex

Sharp

Plump

Micro

Freehand

Streamline Material

Nova

Cyber

Streamline Vault

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

Block – Free

Skull

Other UI

Outlined Line - Streamline Material Free

Social

Rounded Line - Streamline Material Free

Flex Gradient - Free

Skull 2

Sharp Solid - Free

Cyber Line - Free

Skull 1

Ultimate Light - Free

Plump Line - Free

Plump Remix - Free

Sharp Line - Streamline Material Free

Core Line

Edit

Core Flat

Core Gradient

Plump Solid

Cyber Duotone

Content Edition

Core Duo

Ultimate Colors

Delete

Micro Line

Kameleon Colors

Interface

Sharp Line

Micro Solid

Ultimate Duotone

Ultimate Regular

Ultimate Bold

Rounded Line - Streamline Material

Flex Remix

Cyber Line

Ultimate Light

Flex Remix - Free

Plump Remix

Plump Solid - Free

Core Flat - Free

Plump Gradient

Ultimate Regular - Free

Outlined Line - Streamline Material

Core Gradient - Free

Ultimate Bold - Free

Plump Neon

Core Duo - Free

Ultimate Colors - Free

Core Pop - Free

Core Line - Free

<p>[Free + Open-source] Ultimate is the world's largest icon family. The Bold Free version features strong, recognizable icon shapes. Licensed under the Creative Commons - CC BY 4.0</p>

<p>The world's largest icon family with encyclopedic coverage. Designed over twelve years, Ultimate offers every concept from common to rare icons. It's a neutral style and fits most use cases.&nbsp;</p>

### **one sentence positioning**

The safest default, with 16,500+ icons covering virtually every product category in a neutral rounded geometry designed to scale across teams and years.

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### **what it signals**

Reliability, professionalism, visual calm, adaptability, completeness.

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### **best fit when**

- maximum coverage and long-term system stability are the priority
- neutrality must fit across a wide range of product categories without imposing a visual identity
- minimising icon source mixing across large teams is a business requirement

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### **avoid when**

- strong brand personality or stylistic differentiation at the icon layer is needed
- hand-drawn warmth, highly playful consumer tone, or brutalist technical stance is required
- icons are meant to act as decorative or illustrative marketing elements

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### **core visual rules**

- geometry: smooth controlled curves, harmonious proportions, humanist rounded construction
- terminals: rounded throughout — no sharp or flat caps
- corner language: rounded, consistent across all sub-styles
- curves: mathematical arcs with soft, controlled construction
- detail density: low to medium
- silhouette: clear, readable, calibrated for dense UI comfort — never fragile
- emotional tension: low — the neutrality is the point

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### **variants and hierarchy**

Ultimate Light (1px)

- Refined editorial contexts, sparse UI, premium SaaS with generous spacing; the most delicate sub-style

Ultimate Regular (1.5px)

- Primary UI navigation and dashboards; the safest general-purpose choice across any product category

Ultimate Bold (solid)

- Mobile tab bars, active states, small-size legibility contexts, feature callouts

Ultimate Duotone

- Three-layer: colored stroke + tint fill + selective white; feature marketing and onboarding flows

Ultimate Colors

- Multi-color flat fills per element; consumer marketing and illustrative onboarding contexts

**line/solid pairing rule** Light and Regular handle inactive and standard states; Bold handles active, selected, and emphasis states. All three share the same shape vocabulary so hierarchy is expressed purely through weight, never through shape inconsistency.

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### **small-size behavior**

- recommended minimum size: 14px
- best range: 16–32px
- notes: Regular and Bold hold reliably across the range; Light approaches legibility limits below 16px on dark backgrounds and requires near-white color with sufficient contrast.

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### **motion behavior**

- strengths: stable scaling, clean opacity transitions, smooth line-to-solid weight morphs
- ideal motion contexts: tab bar transitions, loading states, hover feedback, onboarding step progressions, feature reveal animations

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### **typography pairing**

Neo-grotesque / Swiss-style neutrality

- Inter, Helvetica Neue, Neue Haas Grotesk, Univers, Graphik, Suisse Int'l, Aktiv Grotesk

Geometric sans (more branded but compatible)

- Montserrat, Poppins, DM Sans, Urbanist, Space Grotesk, Avenir, Proxima Nova

**type alignment rule** Pair with stable, neutral, UI-optimised typography — the Helvetica mindset applied to icon systems. The icons are designed to disappear into the interface; the type should support that intent rather than fight for attention.

**typefaces to avoid** Decorative display fonts, handwritten scripts, highly humanist serif faces, overly playful rounded fonts — any type with strong personality risks overriding the deliberate neutrality of the icon system.

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### **mixing guidance**

Recommended with

- Micro — use Micro as the density layer for tables and inline actions while Ultimate handles primary UI
- Nova — compatible neutral geometry; normalize by keeping one family per UI layer

Possible with normalization

- Core — both are neutral rounded families; separate by component or surface to avoid overlap
- Streamline 3.0 — similar rounded DNA; keep one family per product section

Avoid mixing with

- Freehand — hand-drawn organics contradict the calibrated precision of Ultimate
- Plump — inflated cartoon proportions create weight imbalance
- Kameleon — flat illustration containers have a categorically different visual register

**normalization rules when mixing**

- use Ultimate as the primary UI infrastructure layer across navigation, toolbars, and forms
- isolate secondary families to marketing surfaces, empty states, or onboarding
- never mix Ultimate and another family within the same navigation component

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### **primary use cases**

- SaaS dashboards and admin panels at any scale
- mobile app navigation and product interfaces
- design systems requiring comprehensive multi-category coverage
- enterprise software, settings panels, and navigation systems
- onboarding flows and feature navigation
- component libraries built to serve multiple product teams
- B2B and productivity applications

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### **secondary use cases**

- marketing websites and pitch decks
- product documentation and knowledge bases
- internal tooling and analytics interfaces

The encyclopedia of icons

Skull 1 icon - Ultimate Bold - Free Set

Download Skull 1 SVG vector or transparent PNG icon in Solid style(s) for Sketch and Figma. It belongs to Ultimate Bold - Free vectors SVG collection.