Echo is a location-based reminder app for tasks tied to a particular place. Choose a location and a radius, then configure a reminder to trigger when the device enters that area.
Why I built it
Some things are easy to remember at home and somehow disappear from your head when you get somewhere. I wanted a reminder app that worked around places instead of relying only on a clock. With Echo, you choose a location, attach a reminder, and let the phone handle the nudge when you arrive.
| Year | 2025 |
| Type | Mobile app |
| Client | Personal project |
| My role | Mobile engineering, background location |
| Platform | iOS & Android |
A reminder to buy something at a shop or complete a task on campus is more useful when it appears at the right place. Echo explores how geofencing and local notifications can support that experience without requiring a cloud account.
Echo Splash Screen
Echo Onboarding: Welcome
Echo Onboarding: Location Permission
Echo Onboarding: Location Permission Detail
Echo Onboarding: Notifications
Echo Onboarding: Notification Permission Detail
Echo Onboarding: Reminder Setup
Echo Onboarding: Reminder Setup Detail
Echo Onboarding: Get Started
Echo Onboarding: Ready
Echo Home
Echo Home Loading
Echo Empty Reminder State
Echo Current Location
Echo New Reminder
Echo New Reminder: Place Search
Echo New Reminder: Details
Echo Edit Reminder
Echo Saved Places Dropdown
Echo Saved Places
Echo Saved Place Expanded
Echo Map Search
Echo Map Location Selection
Echo Map Style
Echo No Place Selected
Echo No Search Results
Echo No Reminders Found
Echo Date Picker: Day
Echo Date Picker: Time
Echo Date Picker: Year
Echo Ringtone Picker
Echo Reminder Detail
Echo Reminder Detail: Map
Echo Reminder Detail: Expanded Map
Echo Reminder Search Results
Echo Delete Reminder
Echo Delete Reminder Confirmation
Echo Reminder Saved
Challenge
Background location behaviour varies across mobile operating systems. Battery restrictions, permissions, region limits, and background execution rules all affect when a location-triggered reminder can be delivered.
Action
Background location tasks and geofencing
I used expo-task-manager and location-region monitoring to handle background location events and trigger local notifications when supported operating-system conditions are met.
More efficient location lookup
I added caching and debouncing around forward and reverse geocoding to avoid unnecessary repeated requests when searching for and selecting places.
Result
Echo explores the engineering behind place-aware reminders, from background tasks to local notifications. It helped me understand the practical constraints of mobile location services and the importance of designing around them.