The index was published on Thursday and shared in the midst of a growing debate on the future of urban design for a post-pandemic era.
Helsinki and Zurich joined Singapore in the top three ranks of the best smart cities.
Researchers say that smart cities are more than about smart traffic cameras, car-sharing apps, pollution monitoring, and free wifi for all.
As cities around the world are racing to embrace technology, the real test was whether citizens felt the benefits.
"The world's 'smart' cities don't simply adopt new technology, they make sure it truly improves citizens' lives," said Arturo Bris of the Swiss-based International Institute for Management Development (IMD), which published the index.
The Smart City Index, now in its second year, surveyed more than 13,000 people in 109 cities, focusing on how they perceived the impact of technology in five areas: health and safety, mobility, activities, opportunities and governance.
Others in the top 10 included Auckland, Oslo, Copenhagen, Geneva, Taipei City, Amsterdam, New York, while Abuja, Nairobi and Lagos ranked bottom.
The index, a collaboration with the Singapore University for Technology and Design, showed that many countries are developing smart secondary cities beyond their capitals.