Intervelio – Precision Interval Timer (SwiftUI + SwiftData)

Intervelio is a premium, 100% offline interval timer for HIIT, Tabata, boxing, running and Pomodoro sessions. It ships as a complete, production-ready Xcode project with a sleek dark UI, phase-colored countdown ring, voice announcements, haptics, Apple Health sync and automatic workout history – ready to reskin and publish as your own App Store product.

Demo Instructions

The app is 100% offline – no login and no demo credentials are required.
Open the project in Xcode 15 or newer and press Run on any iOS 17+ simulator or device.
Five preset timers (Tabata, HIIT, Boxing, Pomodoro, Stretch) are seeded automatically on first launch.
All data is stored locally with SwiftData. There are no servers, accounts or API keys.

Everything the App Does

[x] 3-page animated onboarding flow with skip option
[x] Custom splash screen with pulsing logo animation
[x] Home dashboard with workout stats (workouts done, total minutes trained)
[x] Live search across all saved timers
[x] Filter tabs: All / Presets / Favorites
[x] Five built-in presets: Classic Tabata, HIIT Cardio Blast, Boxing / Martial Arts, Pomodoro Study Session, Daily Stretch and Mobility
[x] Create and edit fully custom timers: prep, warm-up, work, rest, rounds, cool-down
[x] Live proportional workout timeline preview with color-coded phases
[x] 8 accent colors and 10 SF Symbols icons per timer
[x] Favorite, duplicate, edit and delete timers (context menu + buttons)
[x] Full-screen running session with animated circular countdown ring
[x] Distinct color per phase: prep, warm-up, work, rest, cool-down, completed
[x] Pause / resume, skip next segment and restart previous segment controls
[x] Overall workout progress bar and total remaining time
[x] End-workout confirmation alert
[x] Animated workout completion screen with trophy, total time and rounds
[x] Automatic workout history (SwiftData) with summary cards and per-log details
[x] Delete single history logs or clear all history
[x] Apple Health / HealthKit integration – saves completed workouts with estimated active energy
[x] Local notifications keep phases on track when the app is in the background
[x] Sound cues: countdown beeps, transition tones and completion chime
[x] Voice announcements of every phase using on-device speech synthesis
[x] Haptic feedback (light, heavy and success patterns) on transitions and actions
[x] Settings: toggle sounds, haptics and voice announcements
[x] Settings: authorize HealthKit, restore default presets, replay onboarding
[x] Rate app (StoreKit review prompt), share sheet, privacy policy and terms sheets
[x] Empty states for timers list, search results, favorites and history
[x] Forced dark theme with a modern neon-on-black design
[x] Full accessibility labels on interactive controls

Technology

Language: Swift 5, SwiftUI only (no storyboards)
Persistence: SwiftData (offline, no backend)
Minimum deployment target: iOS 17.0
Frameworks: SwiftUI, SwiftData, AVFoundation, AudioToolbox, UserNotifications, HealthKit, StoreKit
Third-party dependencies: none – pure native
Architecture: MV-style separation – Models / Views / Services / Theme

What the Buyer Gets

Complete Xcode project (source code, no dependencies to install)
App icon (1024×1024 PNG) and asset catalog
Illustrated documentation (HTML) with setup, reskin and publishing guides
Full screenshot set of every app screen
Free future updates of the template

Development Disclosure

Portions of this template’s source code were developed with AI-assisted tools and were reviewed, tested and finalized by the seller. The codebase is clean, commented and production-ready.

Please Note

This item is source code (a template), not a published app. Basic Xcode knowledge is required to change the bundle ID, rename the app, replace the icon and submit to the App Store. Step-by-step instructions are included in the documentation.

Intervelio | HIIT Interval Timer With Voice Announcements, Haptics and Health Sync - SwiftUI