# Fonts Like IBM Plex Mono

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

## Quick Answer

The closest open font to IBM Plex Mono is iA Writer Mono (similarity 97), then iA Writer Duo and SUSE Mono. iA Writer 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 | **iA Writer Mono** | 97 / 100 | OFL-1.1 | [/fonts/ia-writer-mono/](/fonts/ia-writer-mono.md) |
| #2 | **iA Writer Duo** | 86 / 100 | OFL-1.1 | [/fonts/ia-writer-duo/](/fonts/ia-writer-duo.md) |
| #3 | **SUSE Mono** | 85 / 100 | OFL-1.1 | [/fonts/suse-mono/](/fonts/suse-mono.md) |
| #4 | **Spline Sans Mono** | 84 / 100 | OFL-1.1 | [/fonts/spline-sans-mono/](/fonts/spline-sans-mono.md) |
| #5 | **Noto Sans Mono** | 82 / 100 | OFL-1.1 | [/fonts/noto-sans-mono/](/fonts/noto-sans-mono.md) |
| #6 | **Geist Mono** | 81 / 100 | OFL-1.1 | [/fonts/geist-mono/](/fonts/geist-mono.md) |
| #7 | **Noto Mono** | 81 / 100 | OFL-1.1 | [/fonts/noto-mono/](/fonts/noto-mono.md) |
| #8 | **Source Code Pro** | 81 / 100 | OFL-1.1 | [/fonts/source-code-pro/](/fonts/source-code-pro.md) |
| #9 | **DejaVu Mono** | 80 / 100 | OFL-1.1 | [/fonts/dejavu-mono/](/fonts/dejavu-mono.md) |
| #10 | **Chivo Mono** | 80 / 100 | OFL-1.1 | [/fonts/chivo-mono/](/fonts/chivo-mono.md) |
| #11 | **Roboto Mono** | 80 / 100 | OFL-1.1 | [/fonts/roboto-mono/](/fonts/roboto-mono.md) |
| #12 | **Commit Mono** | 80 / 100 | OFL-1.1 | [/fonts/commit-mono/](/fonts/commit-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/ibm-plex-mono.json](/api/fonts-like/ibm-plex-mono.json).