Choosing fonts for SaaS — three rules that survive

Variable fonts, system stacks, custom families. The choice matters less than the consistency. Three rules.

Choosing fonts for SaaS — three rules that survive

Variable fonts, system stacks, custom families. Designers argue endlessly. The choice matters less than the consistency.

Sans, serif and monospace samples
Sans, serif, mono — pick two for a SaaS UI.

Three rules that survive trends:

  • One sans, one mono. Sans for body and UI. Mono for code, numbers, monospaced data. Serif optional for editorial.
  • System stacks first. -apple-system, BlinkMacSystemFont, Segoe UI, Inter. Custom font only if it carries brand.
  • Variable fonts beat multiple weights. One file, every weight from 100 to 900, smooth transitions.

For Russian and English: Inter Tight, Geist, IBM Plex Sans all support Cyrillic well. Avoid display fonts that drop Cyrillic — looks broken.