Best free alternatives to

Aileron

Dot Colon released Aileron in 2014, a neo-grotesque by Sora Sagano that the foundry describes as looking like Helvetica while following the family logic of Univers. It is dedicated to the public domain under CC0, so it can be modified, redistributed and used in logos without asking anyone. Version 0.102 runs to eight weights from UltraLight to Black with italics, and small departures mark it out: a curved tail on the lowercase l, round dots, slightly loose spacing meant for text and softened clothoid-style curves. It is not on Google Fonts, but these free grotesques cover the same ground and load straight from a CDN.

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

Display + body that work together

Headlines that read at a glance
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 Arimo + Source Serif 4
Quiet type that does the work
Body type does the heavy lifting. Get it right and the reader never thinks about it; get it wrong and they feel it before they can name what is off.
Editorial · Modern Playfair Display + Arimo
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FAQ

Common questions about Aileron alternatives

Is Aileron free?
Yes — Aileron is a free typeface from Dot Colon. Aileron is dedicated to the public domain under CC0 1.0 and can be downloaded free from Dot Colon, Font Squirrel or Fontsource. If you need a similar font you can load from a CDN, the closest is Arimo, available on Google Fonts.
What font is similar to Aileron?
Arimo is the closest free match. A Helvetica and Arial metric-compatible grotesque from Steve Matteson, so it occupies the exact same space Aileron aims at. It keeps the stiffer Arial-style terminals and standard spacing where Aileron rounds its dots, curves the lowercase l and opens the fit for text.
Can I use Arimo in commercial projects?
Yes — Arimo 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.