EVE remembers the small things you always forget, like your keys, your earphones, your charger, and reminds you at the moment you need them. It learns your routine on-device and nudges you when the moment fits, not at a fixed time. Built by a team of five at the Apple Developer Academy and submitted to RevenueCat Shipaton 2026 (Next Gen Award).
EVE is built for micro-reminders: small, easily forgotten actions whose value depends entirely on the right moment. Your keys as you walk out the door, your earphones before the gym, your charger before a long day, your medication after breakfast. Instead of firing a fixed daily alarm, EVE learns your routine from your calendar and the places you go, waits for the moment that actually fits, and nudges you then. The loop is always the same:
learn the routine → detect the right moment → deliver an adaptive nudge → learn from the response.
Fixed-time, repeating reminders fail exactly the people who need them most. If you struggle with prospective memory (remembering to do a thing later), a notification that arrives at 6:00 PM every day becomes noise you swipe away without reading.
We settled on people with ADHD and executive dysfunction as our primary audience, and that shaped everything after: one clear action per screen, tap-based feedback instead of typing, and a calm interface with little visual load.
- Learns from your calendar. During onboarding, EVE reads your calendar and uses Apple's on-device Foundation Models to learn patterns in your week, then asks a few yes/no questions about your own events.
- Prepares you for what's coming. For each calendar event, EVE writes a few concrete prep items (things to bring, prepare, or check) and schedules them an hour before. Today's reminders appear on Home, grouped by part of the day.
- Tells you what matters now. A suggestion bubble on Home shows the single most useful thing to do next, and refreshes when your location, reminders, or the time changes.
- Knows where you are. Pin reminders to saved places, triggered when you arrive or leave.
- Learns from your response. Notifications offer one-tap Done, Too Early, and Too Late, which shift when future reminders fire.
- Shows its work. The Insights screen lists what EVE believes about your routine, in plain sentences you can edit or delete.
Everything except the purchase flow runs on-device. We made a deliberate decision not to introduce any third-party model or cloud AI runtime, so that what we learned would be about Apple's frameworks rather than about someone's API.
| Framework | Role |
|---|---|
| Foundation Models | The reasoning core: reads context and produces structured output |
| Natural Language | Language detection, so non-English text stays out of prompts the model can't handle reliably |
| EventKit | Calendar, the passive timeline EVE learns from |
| CoreLocation + MapKit | Arrivals and departures, place search, travel-time estimates |
| UserNotifications | Delivery channel for nudges and one-tap feedback |
| SwiftData | Long-term memory. The model is stateless, so insights persist here |
| SwiftUI | The entire UI |
RevenueCat (purchases-ios-spm 5.90.2) |
EVE Plus: paywall, purchase, restore, entitlement, Customer Center |
| Mac | Xcode 26.3 or later (verified with Xcode 26.3, build 17C529, and Xcode 27.0, build 27A266a) |
| iPhone | iOS 26.2 or later. For the AI features, an iPhone that supports Apple Intelligence, with Apple Intelligence turned on in Settings |
| Accounts | A free Apple ID in Xcode to sign the app for your own device. No paid developer account, App Store Connect setup, or RevenueCat account needed |
Without Apple Intelligence the app still runs: onboarding explains what's missing and falls back to a fixed set of questions instead of AI-generated ones. The adaptive insights and prep lists need the on-device model.
- Clone the repo and open the project (it lives one folder down, in
eve/):Xcode resolves the RevenueCat Swift package automatically. The version is pinned by the committedgit clone https://github.com/cabbbbsss/EVE.git open EVE/eve/eve.xcodeproj
Package.resolved. - Select the eve target → Signing & Capabilities:
- set Team to your own (personal) team;
- change Bundle Identifier from
com.eve.ch4appto something unique, e.g.com.<yourname>.eve.
- Plug in your iPhone, select it as the run destination, and press Run (⌘R).
- Keep the default Debug configuration. The app ships with a RevenueCat Test Store key, and the RevenueCat SDK deliberately crashes a Release build that uses one, so don't use Archive or a Release scheme.
- First time on a device: enable Developer Mode (Settings → Privacy & Security), then trust your developer certificate (Settings → General → VPN & Device Management).
- In EVE, allow Calendar access during onboarding, and Location and Notifications when EVE asks later. EVE learns from your real calendar, so it has more to work with if the calendar has a few events this week.
cd EVE/eve
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer \
xcodebuild -project eve.xcodeproj -scheme eve \
-destination 'generic/platform=iOS' \
-derivedDataPath /tmp/dd-eve \
CODE_SIGNING_ALLOWED=NO buildSet DEVELOPER_DIR explicitly. If the active toolchain is CommandLineTools, it cannot
expand macros, and @Model / @Generable / @Observable will fail to compile. Point
-derivedDataPath outside the repo so you get a genuine clean build.
CODE_SIGNING_ALLOWED=NO lets the compile check run without the team's signing identity.
EVE's free tier keeps the core benefit (adaptive reminders, local privacy, feedback) because the people EVE is for shouldn't hit a wall before it helps them. EVE Plus is for people who want EVE more deeply in their life.
| Entitlement | EVE Plus (the app gates on the entitlement, never on a product ID) |
| Unlimited places | Free accounts keep 1 saved place; EVE Plus is unlimited. Tapping + on the Locations screen at the limit opens the paywall, and the add flow resumes after purchase |
| Personalized prep | Each event's prep list draws on what EVE has learned about you: confirmed answers, insights, and what you did before similar events |
| Contextual learning | Before an upcoming event, EVE deduces what you might need ("Gym coming up. Should I remind you to bring your gloves?") and asks |
| Paywall | RevenueCat-hosted PaywallView, laid out from the dashboard's current offering (Annual and Quarterly) |
| Manage | Settings → EVE Plus: membership status, Upgrade, Restore Purchases, and RevenueCat Customer Center for subscribers |
| Where | SubscriptionService.swift is the only file that talks to Purchases; PaywallSheets.swift holds the paywall and Customer Center |
Entitlement changes arrive through RevenueCat's customer-info stream, and every Plus feature reads the entitlement when it runs, so a purchase unlocks Plus immediately with no relaunch.
No promo code is needed. The build is wired to RevenueCat's
Test Store with a
public test_… SDK key, so purchases are simulated and no money moves:
- Run the app from Xcode (Debug) as described above.
- Open Settings → EVE Plus → Upgrade to EVE Plus, or tap + on the Locations screen after saving one place.
- Pick a package on the paywall. RevenueCat shows a Test Store dialog. Choose Test valid purchase.
- The
EVE Plusentitlement activates immediately: Settings shows your membership, the PLUS badge appears on Home, and you can save unlimited places.
The same dialog also lets you simulate a failed or cancelled purchase.
Test Store purchases belong to the anonymous RevenueCat user of this install. To start over as a free user, delete the app and run it again. For the same reason, Restore Purchases only re-reads the current user's entitlement under Test Store; it can't bring back a purchase made on a previous install (a real App Store build restores through StoreKit).
Why a public SDK key in an open-source repo is fine: RevenueCat's public SDK keys can only read offerings and start purchases for this app. The secret key that can change subscriber data never leaves the RevenueCat dashboard.
- Calendar events, locations, learned routines, and reminder history are stored on the device in SwiftData.
- All AI reasoning runs on-device through Apple's Foundation Models. EVE sends none of your calendar or location data to any server.
- The only network traffic is RevenueCat's (offerings, purchases, entitlement status), keyed to an anonymous RevenueCat user ID.
- Model output is grounded: prep items and suggestions that name something absent from the context they were built from are dropped before you see them.
- Calendar text comes from other people, so it's marked as data (not instructions) on its way into a prompt, and those markers are stripped from everything the model returns.
- AI insights need an Apple Intelligence iPhone with the model downloaded. Other devices get the non-AI fallback described above.
- Location-based nudges use iOS region triggers, so they can arrive a little after you actually arrive or leave.
- The build uses RevenueCat's Test Store; it isn't configured for App Store purchases.
- Designed and tested on iPhone; the UI and the AI features are English only.
The Xcode project is eve/eve.xcodeproj; all app source lives in eve/eve/.
eve/eve/
├── eveApp.swift @main entry. Owns the SwiftData ModelContainer + Schema.
├── ContentView.swift Root router: onboarding vs. HomeView.
├── Models/ SwiftData @Model classes and the types they own.
├── Views/ SwiftUI screens and sheets.
├── ViewModels/ Per-screen @Observable state.
├── Managers/ Cross-cutting orchestration across several services.
├── Services/ One external capability each (EventKit, CoreLocation, RevenueCat, …).
└── AI/ Foundation Models prompting and context assembly.
| Who | GitHub | Built |
|---|---|---|
| Caca, Sabrina Salsabila Saleh | @cabbbbsss | AI backend architecture: SwiftData models and services, FoundationModelService, ReminderContextBuilder, AssistantManager, the onboarding questionnaire and learning pass, personalised insights. Wrote the tech report. |
| Nanda, Ketut Agus Cahyadi Nanda | @Gusnand | Initial app scaffold and Xcode project, PermissionManager and the Calendar/Location permission flow, base Location and Calendar screens, colour assets and dark mode, InsightView and its Foundation Models prompt, app icon. |
| Dani, Dani Muhammad | @codeby-dani | Calendar screen (swipe paging, live now-line, AI-generated event reminders), Locations screen (filter chips, inline and map-based add, AI routing), History timeline, Settings revamp, per-category notification preferences, migration to the asset-catalog colour system. |
| Amanda, Amanda Dorotea Susanto | @Amanda-ds96 | HomeView, WelcomeView, PermissionView, the streaming AILearningView redesign, UI colour fixes. |
| Keiko, Keiko Serah | — | Design and research. |
Tech Report - Eve.md is the full challenge write-up: what
we explored, what we built and threw away, the limits we hit with on-device Foundation
Models, and how we arrived at this app.
MIT © 2026 Sabrina Salsabila Saleh, Ketut Agus Cahyadi Nanda, Dani Muhammad, Amanda Dorotea Susanto, Keiko Serah.