This app offers a free "digital travel assistant" experience, using GPS to provide audio tours and local secrets as you walk through the city. OASA - App Store - Apple
This is the most popular taxi app in Greece. It allows you to see a fare estimate before you book and pay automatically via a connected card, ensuring a transparent experience.
This is the official app for Athens public transport. It is critical for bus navigation because it shows the real-time GPS position of every bus in the city, providing accurate arrival times even when printed schedules are unreliable.