# Fonts Like Instrument Serif

12 open fonts whose letters are closest to Instrument Serif, ranked by a glyph comparison. All free for commercial use.

## Quick Answer

The closest open font to Instrument Serif is Libre Caslon Condensed (similarity 75), then Oranienbaum and PT Sans Narrow. Libre Caslon Condensed is released under the SIL Open Font License 1.1 and is free for commercial use.

## Ranked Open Lookalikes (12 Fonts)

| Rank | Font | Similarity Score | Licence | Details |
| :--- | :--- | :--- | :--- | :--- |
| #1 | **Libre Caslon Condensed** | 75 / 100 | OFL-1.1 | [/fonts/libre-caslon-condensed/](/fonts/libre-caslon-condensed.md) |
| #2 | **Oranienbaum** | 63 / 100 | OFL-1.1 | [/fonts/oranienbaum/](/fonts/oranienbaum.md) |
| #3 | **PT Sans Narrow** | 59 / 100 | OFL-1.1 | [/fonts/pt-sans-narrow/](/fonts/pt-sans-narrow.md) |
| #4 | **Oswald** | 58 / 100 | OFL-1.1 | [/fonts/oswald/](/fonts/oswald.md) |
| #5 | **Special Gothic Condensed One** | 57 / 100 | OFL-1.1 | [/fonts/special-gothic-condensed-one/](/fonts/special-gothic-condensed-one.md) |
| #6 | **Sofia Sans Condensed** | 57 / 100 | OFL-1.1 | [/fonts/sofia-sans-condensed/](/fonts/sofia-sans-condensed.md) |
| #7 | **Cossette Titre** | 56 / 100 | OFL-1.1 | [/fonts/cossette-titre/](/fonts/cossette-titre.md) |
| #8 | **Asap Condensed** | 55 / 100 | OFL-1.1 | [/fonts/asap-condensed/](/fonts/asap-condensed.md) |
| #9 | **Barlow Condensed** | 55 / 100 | OFL-1.1 | [/fonts/barlow-condensed/](/fonts/barlow-condensed.md) |
| #10 | **Share** | 55 / 100 | OFL-1.1 | [/fonts/share/](/fonts/share.md) |
| #11 | **Ubuntu Condensed** | 54 / 100 | UFL-1.0 | [/fonts/ubuntu-condensed/](/fonts/ubuntu-condensed.md) |
| #12 | **Fira Sans Extra Condensed** | 54 / 100 | OFL-1.1 | [/fonts/fira-sans-extra-condensed/](/fonts/fira-sans-extra-condensed.md) |

## Other Scripts With Similar Latin Letters

- **BIZ UDMincho** (Jpan): Similarity 66, licence OFL-1.1 - [/fonts/biz-udmincho/](/fonts/biz-udmincho.md)
- **BIZ UDGothic** (Jpan): Similarity 54, licence OFL-1.1 - [/fonts/biz-udgothic/](/fonts/biz-udgothic.md)

## Scoring Method

62 letters and digits (A-Z a-z 0-9) rendered at 160px cap height on a 32x32 grid with 3px gaussian blur, combined with edge-orientation texture (15% weight). Scores are normalized so that 0 represents an average pair of fonts across the 1571 compared fonts, and 100 represents identical letter shapes. Computed on 2026-10-22 using glyph-shape + edge-texture v2.

## Machine API

JSON representation available at [/api/fonts-like/instrument-serif.json](/api/fonts-like/instrument-serif.json).