Best free alternatives to

SF Mono

Apple introduced SF Mono at WWDC 2016 as the monospaced member of the San Francisco family, the sibling of SF Pro built for Xcode, Terminal and Console. It carries the same neo-grotesque skeleton as SF Pro, with the letters forced onto a single fixed width, and ships in six weights with matching italics across Latin, Greek and Cyrillic. It is a free download from Apple's developer site, but the license limits it to registered developers designing and building for Apple platforms, so it cannot go into a website or product. These free monospaced typefaces give you the same clean, neutral coding register with no such restriction.

The closest font to SF Mono
The quick brown fox jumps over the lazy dog
More fonts similar to SF Mono
The quick brown fox jumps over the lazy dog
Pairings

Display + body that work together

Letters that hold their nerve
The display sets the register; the body follows through. When both halves of a pair pull in the same direction, the design disappears and the words come forward.
Mono · Editorial Geist Mono + Source Serif 4
Headlines that read at a glance
Two thousand years of letterforms boil down to a handful of decisions — width, weight, proportion. Pick a pair you trust, and let the rest take care of itself.
Mono · Editorial Geist Mono + Lora
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FAQ

Common questions about SF Mono alternatives

Is SF Mono free?
No — SF Mono is a commercial typeface from Apple Inc.. Downloadable from Apple's developer site, but licensed only to registered Apple developers for designing and developing software for Apple platforms; it may not be embedded, redistributed or used elsewhere. The closest free alternative is Geist Mono, available on Google Fonts.
What font is similar to SF Mono?
Geist Mono is the closest free match. Vercel's open monospaced face shares SF Mono's neo-grotesque, system-font neutrality and tight, even texture, which is why it reads so naturally in developer tooling. It is available on Google Fonts under the SIL Open Font License, so it can go into websites and products where SF Mono's Apple-only license forbids it.
Can I use Geist Mono in commercial projects?
Yes — Geist Mono is published under a free license on Google Fonts and can be used in commercial work. Confirm the license text at the source before shipping.