# Fonts Like Spline Sans Mono

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

## Quick Answer

The closest open font to Spline Sans Mono is IBM Plex Mono (similarity 84), then Google Sans Code and iA Writer Mono. IBM Plex Mono 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 | **IBM Plex Mono** | 84 / 100 | OFL-1.1 | [/fonts/ibm-plex-mono/](/fonts/ibm-plex-mono.md) |
| #2 | **Google Sans Code** | 82 / 100 | OFL-1.1 | [/fonts/google-sans-code/](/fonts/google-sans-code.md) |
| #3 | **iA Writer Mono** | 82 / 100 | OFL-1.1 | [/fonts/ia-writer-mono/](/fonts/ia-writer-mono.md) |
| #4 | **Roboto Mono** | 81 / 100 | OFL-1.1 | [/fonts/roboto-mono/](/fonts/roboto-mono.md) |
| #5 | **Chivo Mono** | 81 / 100 | OFL-1.1 | [/fonts/chivo-mono/](/fonts/chivo-mono.md) |
| #6 | **Fira Code** | 81 / 100 | OFL-1.1 | [/fonts/fira-code/](/fonts/fira-code.md) |
| #7 | **Commit Mono** | 81 / 100 | OFL-1.1 | [/fonts/commit-mono/](/fonts/commit-mono.md) |
| #8 | **Geist Mono** | 80 / 100 | OFL-1.1 | [/fonts/geist-mono/](/fonts/geist-mono.md) |
| #9 | **Martian Mono** | 80 / 100 | OFL-1.1 | [/fonts/martian-mono/](/fonts/martian-mono.md) |
| #10 | **Monaspace Neon** | 79 / 100 | OFL-1.1 | [/fonts/monaspace-neon/](/fonts/monaspace-neon.md) |
| #11 | **DejaVu Mono** | 78 / 100 | OFL-1.1 | [/fonts/dejavu-mono/](/fonts/dejavu-mono.md) |
| #12 | **Noto Sans Mono** | 78 / 100 | OFL-1.1 | [/fonts/noto-sans-mono/](/fonts/noto-sans-mono.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/spline-sans-mono.json](/api/fonts-like/spline-sans-mono.json).