# Fonts Like iA Writer Duo

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

## Quick Answer

The closest open font to iA Writer Duo is iA Writer Quattro (similarity 93), then iA Writer Mono and IBM Plex Mono. 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** | 93 / 100 | OFL-1.1 | [/fonts/ia-writer-quattro/](/fonts/ia-writer-quattro.md) |
| #2 | **iA Writer Mono** | 89 / 100 | OFL-1.1 | [/fonts/ia-writer-mono/](/fonts/ia-writer-mono.md) |
| #3 | **IBM Plex Mono** | 86 / 100 | OFL-1.1 | [/fonts/ibm-plex-mono/](/fonts/ibm-plex-mono.md) |
| #4 | **IBM Plex Sans** | 80 / 100 | OFL-1.1 | [/fonts/ibm-plex-sans/](/fonts/ibm-plex-sans.md) |
| #5 | **Trispace** | 78 / 100 | OFL-1.1 | [/fonts/trispace/](/fonts/trispace.md) |
| #6 | **Clear Sans** | 74 / 100 | Apache-2.0 | [/fonts/clear-sans/](/fonts/clear-sans.md) |
| #7 | **SUSE Mono** | 74 / 100 | OFL-1.1 | [/fonts/suse-mono/](/fonts/suse-mono.md) |
| #8 | **Recursive** | 73 / 100 | OFL-1.1 | [/fonts/recursive/](/fonts/recursive.md) |
| #9 | **Fragment Mono** | 72 / 100 | OFL-1.1 | [/fonts/fragment-mono/](/fonts/fragment-mono.md) |
| #10 | **Noto Sans Mono** | 72 / 100 | OFL-1.1 | [/fonts/noto-sans-mono/](/fonts/noto-sans-mono.md) |
| #11 | **Monaspace Neon** | 72 / 100 | OFL-1.1 | [/fonts/monaspace-neon/](/fonts/monaspace-neon.md) |
| #12 | **Roboto Mono** | 72 / 100 | OFL-1.1 | [/fonts/roboto-mono/](/fonts/roboto-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/ia-writer-duo.json](/api/fonts-like/ia-writer-duo.json).