Fastio | Intermittent Fasting Tracker With Streak Charts, Challenges and Subscriptions - SwiftUI

Fastio – Intermittent Fasting Tracker (SwiftUI Template)

Fastio is a complete, App Store ready intermittent fasting tracker built with SwiftUI and SwiftData. It ships as full Xcode source code with a modern dark design, a fasting timer with progress ring, streak statistics, weekly bar charts, challenges and achievements, local notifications, iCloud sync and a complete StoreKit 2 subscription paywall.

Demo Instructions

Fastio is a 100% offline app template. There is NO login and NO demo credentials are required – just build and run in Xcode and the app starts with a 3-page onboarding, then you land on the fasting timer.

Note on In-App Purchases: the subscription paywall uses StoreKit 2 with the product IDs fzen_y, fzen_3m and fzen_m. Without your own App Store Connect products the paywall shows placeholder prices – everything else works without any configuration.

Everything the App Does

• 3-page onboarding flow with notification permission request
• Fasting timer with animated progress ring (fasting phase in green gradient)
• Automatic transition from fasting phase to eating window phase
• Start / Stop confirmation alerts with clear messaging
• 5 built-in fasting protocols: 13:11, 16:8, 18:6, 20:4 and 23:1 (OMAD)
• Custom 24h, 48h and 72h plan builders with hour wheel pickers (premium)
• Free tier limits: 4 fasts maximum, paywall triggered after that
• History screen with current streak, longest streak and longest fast cards
• Last 7 days fasting bar chart with color coded completed / failed / in-progress days
• Monthly overview with total hours, average and success rate
• Full history list grouped by month with Show More / Show Less
• Progress screen with 30+ challenges and achievements in 7 categories
• Progress bars per challenge, completion states and progression sorting
• StoreKit 2 subscription paywall: yearly, 3 months and monthly with free trial toggle
• Save percentage badge, restore purchases and subscription management links
• Local notifications: fast ending soon, fast complete and eating window reminders
• Notification permission status section in Settings with Enable shortcut
• Settings: plan grid, custom plans, subscription section, rate app, contact, terms and privacy
• State recovery: active fasts survive app restarts and are restored automatically
• CloudKit sync via SwiftData (falls back to local storage automatically)
• Automatic rating prompt after 10 sessions (SKStoreReviewController)
• Dark and light mode support with adaptive asset catalog colors
• Duplicate challenge cleanup and CloudKit sync loading screen on launch

Technology

• Language: Swift 5, SwiftUI
• Data: SwiftData with CloudKit sync (iOS 17+)
• Minimum iOS: 17.0
• Monetization: StoreKit 2 auto-renewable subscriptions
• Notifications: UserNotifications framework
• Charts: Custom SwiftUI bar chart
• Third-party dependencies: none – 100% native code
• Xcode: 16 or later recommended

What the Buyer Gets

• Complete Xcode project source code (Swift files, asset catalog, entitlements, Info.plist)
• App icon (1024×1024) included in the asset catalog
• documentation.html – step-by-step setup and customization guide with screenshots
• screenshots/ folder with all app screens shown in the preview
• Free lifetime updates to this template

Development Disclosure

Portions of this template’s source code were developed with AI-assisted tools. All code has been reviewed, tested and builds successfully with Xcode.

Please Note

This is a source code template, not a compiled app. You need Xcode and basic knowledge of iOS development to build, customize and publish it to the App Store. App Store submission requires your own Apple Developer account.