# Fonts Like Source Serif 4

12 open fonts whose letters are closest to Source Serif 4, ranked by a glyph comparison. All free for commercial use.

## Quick Answer

The closest open font to Source Serif 4 is Noto Serif JP (similarity 86), then Charis SIL and STIX Two Text. Noto Serif JP 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 | **Noto Serif JP** | 86 / 100 | OFL-1.1 | [/fonts/noto-serif-jp/](/fonts/noto-serif-jp.md) |
| #2 | **Charis SIL** | 81 / 100 | OFL-1.1 | [/fonts/charis-sil/](/fonts/charis-sil.md) |
| #3 | **STIX Two Text** | 79 / 100 | OFL-1.1 | [/fonts/stix-two-text/](/fonts/stix-two-text.md) |
| #4 | **Tienne** | 78 / 100 | OFL-1.1 | [/fonts/tienne/](/fonts/tienne.md) |
| #5 | **Brawler** | 78 / 100 | OFL-1.1 | [/fonts/brawler/](/fonts/brawler.md) |
| #6 | **Merriweather** | 78 / 100 | OFL-1.1 | [/fonts/merriweather/](/fonts/merriweather.md) |
| #7 | **IBM Plex Serif** | 77 / 100 | OFL-1.1 | [/fonts/ibm-plex-serif/](/fonts/ibm-plex-serif.md) |
| #8 | **Volkhov** | 76 / 100 | OFL-1.1 | [/fonts/volkhov/](/fonts/volkhov.md) |
| #9 | **Crimson Pro** | 76 / 100 | OFL-1.1 | [/fonts/crimson-pro/](/fonts/crimson-pro.md) |
| #10 | **Frank Ruhl Libre** | 75 / 100 | OFL-1.1 | [/fonts/frank-ruhl-libre/](/fonts/frank-ruhl-libre.md) |
| #11 | **Noto Serif** | 75 / 100 | OFL-1.1 | [/fonts/noto-serif/](/fonts/noto-serif.md) |
| #12 | **Roboto Serif** | 75 / 100 | OFL-1.1 | [/fonts/roboto-serif/](/fonts/roboto-serif.md) |

## Other Scripts With Similar Latin Letters

- **Cactus Classical Serif** (Hant): Similarity 86, licence OFL-1.1 - [/fonts/cactus-classical-serif/](/fonts/cactus-classical-serif.md)
- **Song Myung** (Kore): Similarity 86, licence OFL-1.1 - [/fonts/song-myung/](/fonts/song-myung.md)
- **Bpmf Zihi Kai Std** (Hant): Similarity 84, licence OFL-1.1 - [/fonts/bpmf-zihi-kai-std/](/fonts/bpmf-zihi-kai-std.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/source-serif-4.json](/api/fonts-like/source-serif-4.json).