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Open Sans vs Source Sans Pro
Open Sans and Source Sans Pro are both freely available sans-serif fonts often used as alternatives to the same premium typefaces. Open Sans serves as a replacement for 23 premium fonts while Source Sans Pro covers 15. This comparison helps you pick between two strong open-source options.
Design DNA
Design overlap:50%
Open Sans
Source Sans Pro
Highlighted traits are shared between both fonts
Visual Comparison
Open Sans
FreeAa Bb Cc 123
The quick brown fox jumps over the lazy dog
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
0123456789 !@#$%^&*()
Source Sans Pro
FreeAa Bb Cc 123
The quick brown fox jumps over the lazy dog
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
0123456789 !@#$%^&*()
Feature Comparison
| Feature | Open Sans | Source Sans Pro |
|---|---|---|
| Type | Free | Free |
| Classification | sans-serif | sans-serif |
| Variable Font | Yes | Yes |
| Weights | Variable (100-900) | Variable (100-900) |
| Italics | Yes | Yes |
| License | Apache-2.0 | OFL-1.1 |
| Language Support | latin, latin-extended, cyrillic, cyrillic-extended, greek, greek-extended, vietnamese | latin, latin-extended, cyrillic, cyrillic-extended, greek, greek-extended, vietnamese |
| Source | Google Fonts | Google Fonts |
Best Use Cases
Typography optimized for user interfaces, design systems, and digital products. ...
Typography suited for magazines, newspapers, and long-form content. Editorial fo...
Fonts that establish strong brand identity with distinctive character and versat...
Typography for established businesses, enterprise software, and professional ser...
Typography for print and digital publishing, book design, and editorial producti...
Typography for business documents, reports, and professional communications. Doc...
Typography optimized for websites, landing pages, and web applications. Web font...
Typography for wayfinding, environmental graphics, and public signage. Signage f...
Typography for navigation systems, directional signage, and environmental graphi...
Typography for medical, wellness, and healthcare applications. Healthcare fonts ...
Weight & Style Coverage
Performance Comparison
| Metric | Open Sans | Source Sans Pro |
|---|---|---|
| Score | 54/100 | 69/100 |
| File Size | 706.8 KB | 181.1 KB |
| Weights | 9 (var) | 9 (var) |
| Italics | Yes | Yes |
| Variable Font | Yes (1 axes) | Yes (1 axes) |
| Language Groups | 7 | 7 |
| CDN Delivery | Yes | Yes |
| x-Height Ratio | 0.535 | 0.486 |
| Cap Height Ratio | 0.714 | 0.66 |
Source Sans Pro is 74% lighter for the standard weight set (400, 400i, 700).
Which Should You Choose?
Recommended: Open Sans
- Replaces 23 premium fonts
- clean, professional character
- Popular in healthcare-medical and enterprise-corporate
- Variable font with continuous weight range
- Free under Apache-2.0
Consider: Source Sans Pro
- Replaces 15 premium fonts
- professional, clean character
- Popular in enterprise-corporate and financial-services
- Variable font with continuous weight range
- Free under OFL-1.1
Premium Font Coverage
Both replace (7)
Only Open Sans (16)
Only Source Sans Pro (8)
Open Sans covers 23 premium fonts vs Source Sans Pro's 15