Short answer first, then details: Roboto for UI text, YouTube Sans for branding, and what creators usually mean when they search "YouTube Sans font."
YouTube uses Roboto for most interface text and YouTube Sans for logo and brand-led type treatments. In other words: Roboto is the product UI workhorse, while YouTube Sans is the branded voice you see in identity-focused surfaces.
| Where | Typeface | Notes |
|---|---|---|
| YouTube app and web UI | Roboto | Primary typeface for navigation, labels, metadata, and controls |
| Logo and core brand moments | YouTube Sans | Brand-led display voice, not the general interface default |
| Creator meme overlays | Varies | Usually editor-added caption fonts, not YouTube product typography |
| Design lookalikes | Inter, Manrope, Montserrat | Useful when you need a similar clean sans style quickly |
Roboto is optimized for dense UI and metadata readability, which is why it appears across most day-to-day YouTube experiences. YouTube Sans is a brand-forward family used where visual identity needs more personality and distinction.