# Fonts Like IBM Plex Sans

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

## Quick Answer

The closest open font to IBM Plex Sans is iA Writer Quattro (similarity 85), then Clear Sans and Gothic A1. iA Writer Quattro 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 Quattro** | 85 / 100 | OFL-1.1 | [/fonts/ia-writer-quattro/](/fonts/ia-writer-quattro.md) |
| #2 | **Clear Sans** | 84 / 100 | Apache-2.0 | [/fonts/clear-sans/](/fonts/clear-sans.md) |
| #3 | **Gothic A1** | 84 / 100 | OFL-1.1 | [/fonts/gothic-a1/](/fonts/gothic-a1.md) |
| #4 | **Roboto** | 83 / 100 | OFL-1.1 | [/fonts/roboto/](/fonts/roboto.md) |
| #5 | **Pretendard** | 83 / 100 | OFL-1.1 | [/fonts/pretendard/](/fonts/pretendard.md) |
| #6 | **Varta** | 83 / 100 | OFL-1.1 | [/fonts/varta/](/fonts/varta.md) |
| #7 | **Radio Canada** | 82 / 100 | OFL-1.1 | [/fonts/radio-canada/](/fonts/radio-canada.md) |
| #8 | **Noto Sans JP** | 82 / 100 | OFL-1.1 | [/fonts/noto-sans-jp/](/fonts/noto-sans-jp.md) |
| #9 | **Funnel Sans** | 82 / 100 | OFL-1.1 | [/fonts/funnel-sans/](/fonts/funnel-sans.md) |
| #10 | **Inter** | 82 / 100 | OFL-1.1 | [/fonts/inter/](/fonts/inter.md) |
| #11 | **Spline Sans** | 82 / 100 | OFL-1.1 | [/fonts/spline-sans/](/fonts/spline-sans.md) |
| #12 | **Source Sans 3** | 82 / 100 | OFL-1.1 | [/fonts/source-sans-3/](/fonts/source-sans-3.md) |

## Other Scripts With Similar Latin Letters

- **Asta Sans** (Kore): Similarity 83, licence OFL-1.1 - [/fonts/asta-sans/](/fonts/asta-sans.md)
- **Narnoor** (Gong): Similarity 83, licence OFL-1.1 - [/fonts/narnoor/](/fonts/narnoor.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-sans.json](/api/fonts-like/ibm-plex-sans.json).