Sass is the stylesheet language; SCSS is one of its two syntaxes. SCSS uses braces and semicolons and looks much like CSS. Sass’s other, indented syntax uses .sass files, indentation and newlines. Both syntaxes support the same Sass features and compile to CSS.
What Sass and SCSS mean
Sass is the language used to write stylesheets with features such as variables and nested rules. It offers two ways to write that language: SCSS, usually saved with the .scss extension, and the indented syntax, usually saved as .sass. The Sass project describes SCSS as a near-superset of CSS and its most popular syntax, but the two formats have the same Sass feature set.
SCSS vs. indented Sass syntax
| Feature | SCSS | Indented syntax |
|---|---|---|
| Typical file extension | .scss |
.sass |
| How blocks and nesting are marked | Curly braces | Indentation |
| How statements are separated | Semicolons; the final semicolon in a block is optional | Newlines; indentation defines blocks |
| Appearance compared with CSS | Near-superset of CSS, with some parsing exceptions | Different visual form from CSS |
| Sass feature support | Full Sass feature set | Same Sass feature set |
| Project characterization | Most popular syntax, according to the Sass project | Original Sass syntax; less commonly used, according to the Sass project |
The comparison describes how you write Sass, not what the browser receives. Sass compiles either source format into CSS.
How the same rule looks in each syntax
Here is a small example written as SCSS:
$accent: rebeccapurple;
.notice {
color: $accent;
&:hover {
color: darkblue;
}
}The same idea in indented syntax:
$accent: rebeccapurple
.notice
color: $accent
&:hover
color: darkblueIn the SCSS version, braces enclose blocks and semicolons separate declarations. In the indented version, indentation shows which declarations belong inside each rule, and each statement ends with a newline.
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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How Sass files become CSS
Sass source files are authored inputs, not stylesheets that browsers use directly. The Sass getting-started guide shows a command-line compilation such as sass input.scss output.css; the resulting CSS is what you include in a web page. Sass also documents watch mode for rebuilding output as source files change. See the Sass getting-started guide.
Which syntax should you choose?
- Choose SCSS for CSS familiarity. Its braces and semicolons make it look close to ordinary CSS, which can help when adding Sass to an existing CSS workflow.
- Choose indented syntax if your team prefers it. It keeps structure in indentation and uses fewer punctuation marks, but the team should agree on conventions for
.sassfiles. - For an existing project, follow its established format. Consistency is usually more useful than changing syntax when both formats provide the same features.
The Sass project leaves the choice to users and teams. Its syntax documentation also says the two syntaxes can load one another. Nothing in the cited official documentation establishes that one syntax is categorically faster or more powerful.
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Details that can cause confusion
Comments in indented syntax
Both syntaxes support silent // comments and CSS-style /* */ comments. In indented syntax, indentation affects which following lines belong to a comment, so check the Sass comments documentation when formatting multiline comments.
@use and @import are not syntax choices
These are Sass module-loading constructs, not names for SCSS or indented syntax. Dart Sass deprecated @import in version 1.80.0 in favor of the module system, including @use. That change concerns Sass’s module system, not a difference between .scss and .sass files. See the Sass @import migration documentation.
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“Near-superset of CSS” has a parsing caveat
SCSS is designed to be highly compatible with CSS, but that does not mean every invalid CSS construct is accepted the same way. Sass documents that SCSS can report parse errors where a CSS parser may recover from an error. See Sass syntax parsing.
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