Bulgaria's capital and largest city, Sofia sits at the foot of Vitosha mountain and generates roughly a third of the national economy. Its most visible smart-city move is in mobility: the municipal Urban Mobility Centre scrapped paper-heavy fare collection in 2021 for the Sofia Ticketing System, an account-based, open-loop platform that lets riders tap any contactless bank card, phone wallet or QR mobile ticket across metro, bus, tram and trolleybus. A daily fare cap and worldwide card acceptance made the network unusually easy to use for residents and visitors alike.

The atlas documents 1 project in Sofia: 1 still running without a verdict. The entry carries an evidence grade — the strongest here is official (1 entry) — and links its sources.

All 1 project in Sofia

✔ Every published entry is checked against the public sources it cites before publication.

Outcome: 1 ongoing — Evidence: 1 official

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Official strategy and sources

📎 Cite this city

1001 Smart Cities (2026). “Smart-city projects in Sofia, Bulgaria.” The Smart City Atlas. https://1001smartcities.org/cities/sofia/ (last verified 2026-07-19). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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