UX Design KPI

Mike's Notes

This list of KPIs comes from Vitaly Friedman's free Smashing Magazine workshop on Inclusive Design Patterns, which was held this morning on Zoom.

Resources

• https://smashingconf.com/online-workshops/workshops/inclusive-design-patterns-vitaly-friedman/

References

• Reference

Repository

• Home > Ajabbi Research > Library >
• Home > Handbook > 

Last Updated

18/05/2025

UX Design KPI

By: Vitaly Friedman

Smashing Magazine: 27/09/2024

Improve

• Accuracy of data ≈ 100%.

• Time to complete < 35s.

• Time to relevance < 30s.

• Frequency of errors < 3/v.

• Error recovery speed < 7s.

• Top tasks success > 80%.

• System Usability Scale > 70.

• WCAG AA coverage ≈ 100%.

• Core Web Vitals ≈ 100%.

Measure

• Sales/marketing costs < $15K/w.

Reduce

• Flesch reading ease score > 60.

• “Turn-around” score < 1 week.

• Service desk inquiries < 35/w.

• Search query iterations < 3/query.

• Time to release/update < 14 days.

• Non-content on a page < 25%.

• Environmental impact < 0.3g/p.

• Onboarding time < 15 sec.