Best free alternatives to

Dia

Schick Toikka released Dia in 2014, designed by Florian Schick and Lauri Toikka. It draws on the irregular Grotesk sans serifs of the mid-1800s, but instead of smoothing them into a neutral family it keeps their oddities: the light weight is condensed, the black is extended, and each of the four weights follows a different historical model while sharing vertical proportions so they can sit in one paragraph. Typographica's review called it weird but personably legible, with incised stems and bowls and a lowercase a that pitches into its own counter. These free typefaces work the same early-grotesque register without the license fee.

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

Display + body that work together

The shape of a working week
A pairing is a relationship: one voice speaks first, the other answers, and the contrast between them sets the tone for the whole page.
Modern · Editorial Work Sans + Crimson Pro
Headlines that read at a glance
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.
Editorial · Modern Fraunces + Work Sans
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FAQ

Common questions about Dia alternatives

Is Dia free?
No — Dia is a commercial typeface from Schick Toikka. Dia is a commercial typeface sold by Schick Toikka under the foundry's own license; a PDF specimen is free but the fonts are not. The closest free alternative is Work Sans, available on Google Fonts.
What font is similar to Dia?
Work Sans is the closest free match. Loosely based on early grotesques such as Stephenson Blake's, the same nineteenth-century British stock that Dia and Founders Grotesk mine. Its heavier weights carry similar bluntness and slightly uneven rhythm, but Work Sans keeps one consistent width across the family rather than Dia's condensed-to-extended spread.
Can I use Work Sans in commercial projects?
Yes — Work Sans 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.