Salesforce Cosmos is the first theme available in Salesforce Lightning Design System 2 (SLDS 2). Salesforce Cosmos was released as beta in Winter ’25 with the temporary name Enhanced Lightning User Interface (UI). It's a new design that makes Salesforce simpler to use with circular patterns, easy-to-understand icons, new colors, and better typography. Salesforce Cosmos is the default theme of Salesforce Lightning Design System 2.
| Available in: Lightning Experience |
| Availability varies by edition |
SLDS 2
SLDS 2 is the latest design system for Lightning Platform products. It combines the Salesforce Cosmos theme with an enhanced design architecture and updated tools. SLDS 2 provides customization options for admins, developers, and designers to bring brands to life.
Benefits of SLDS 2 For Admins
As an admin, SLDS 2 provides themes and branding features to customize your users’ experience.
- Access no-code customization themes in Setup in Themes and Branding
- Enable the Salesforce Cosmos theme or create your own custom theme
To get started, follow the steps in Personalize Your Org with Themes and Branding.
SLDS 2 Benefits For Developers and Designers
SLDS 2 offers your team of developers and designers more granular control over your org’s user interface (UI).
- Build custom experiences with Lightning base components
- Future-proof your Salesforce org with global styling hooks
- Design and build with updated developer tools, pattern libraries, and style guidelines
- Create consistent, accessible UI features and flows
To get started, see Explore the Salesforce Cosmos theme.
SLDS 2 Features
In addition to Salesforce Cosmos in Themes and Branding, SLDS 2 includes different features. Refer to this table to learn more about individual features within SLDS 2.
| SLDS 2 Feature | Description |
|---|---|
| Themes and Branding | Pre-built themes plus the ability to build your own, all grounded in an expanded color palette, give you more granular customization options. |
| Salesforce Cosmos theme | Available within Themes and Branding, Salesforce Cosmos is a modern, intuitive visual design with circular motifs, refreshed colors, and improved typography. |
| Advanced Figma kits | SLDS 2 Figma kits guide your developers and designers on the use of pre-built components with refreshed styling and 1:1 code mapping. |
| Developer tools | New rule sets, inline guidance, and bulk reporting tools offer developers greater control, specificity, and efficiency. |
| Dark mode |
As of Winter ’26, admins can enable dark mode for any SLDS 2 theme, giving their users the ability to toggle between light and dark modes. Not all Salesforce apps and features are fully optimized for dark mode yet, including:
|
| Display density, including comfy and compact modes | Spacing and layout controls of interface elements within a given screen area lead to greater personalization of your UI. |
| SLDS 2 architecture |
|
| Visualforce pages | Visualforce pages are the top-level container for custom apps built with Visualforce. As of Winter ’26, SLDS 2 is available on Visualforce pages. |
SLDS 2 and Salesforce Cosmos Availability by Salesforce Product and Feature
As of Winter ’26, SLDS 2 features are generally available (GA) in all Salesforce editions. SLDS 2 and Salesforce Cosmos are available for all new orgs and are turned on by default for these editions. They are also available for all existing orgs as an opt-in through Themes and Branding for the same editions.
- Developer
- Enterprise
- Pro Suite
- Professional
- Starter Suite
- Unlimited
Products Not Currently Supported to Use SLDS 2
Currently, we don't have plans to support Salesforce Cosmos or SLDS 2 in some Salesforce products and add-ons.
- Salesforce mobile app
- Builders, such as Flow Builder and Lightning App Builder
- Lightning Out
- Experience Cloud
SLDS 2 Limitations
Although SLDS 2 is generally available, some of its features are available as beta features.
- The default Salesforce Cosmos theme and SLDS 2 are generally available (GA), but some related features are beta or are available in a limited capacity. Beta features can have limitations, which can impact user experiences.
- Enabling Salesforce Cosmos doesn’t automatically enable SLDS 2 features, such as dark mode. Specific SLDS 2 features are enabled separately.
- Some Salesforce products are built on platforms other than Lightning. If Salesforce Cosmos isn't available, users continue to see the default UI that they’re used to.