Chordia | Song Repertoire and Tuner - Flutter App Template

The Ultimate Mobile Stage Toolkit and Repertoire Workspace for Musicians, Bands and Audio Engineers

Chordia is an ultra-premium, offline-first Flutter application template engineered specifically for gigging musicians, acoustic performers, bandleaders, and studio engineers. Built with the cutting-edge Flutter 3.2+ framework and Riverpod 2.x State Management, Chordia combines a high-speed Song Library and Key Transposer, a collaborative Setlist Builder with offline P2P Stage QR AirSync, and a powerhouse workbench of 50+ Pro Stage and Studio Tools into a single, breathtaking mobile experience.

Designed with a luxurious Dark Charcoal and Glowing Metallic Gold (#121212 / #F1C40F) aesthetic, Chordia guarantees rock-solid reliability on dark stages without blinding performers. It operates entirely offline utilizing a lightning-fast Drift SQLite Local Database, while offering instant Cloud Drive backup via JSON vaults. Furthermore, Chordia is pre-configured with complete monetization features—including Google AdMob (App Open with 2-hour cooldown, Adaptive Banners, Interstitials, Native Ads), European UMP GDPR Consent Compliance, and plug-and-play in-App Purchase (IAP) to maximize your revenue as an app publisher!

100% Full Source Code Included in Regular License Guarantee!

License Confirmation: Every single feature mentioned in this template including the 50+ Pro Stage and Studio Tools Workbench, Smart Key Transposer, AirSync Stage QR Broadcast, Multi-Language Localization, and Drift SQLite Database—along with its complete, unminified Dart source code is 100% included with the Regular License. We do not restrict code access or lock any source modules based on license tiers. The in-App Purchase (IAP) paywall logic in the template is provided purely as a pre-built monetization structure for you (the app developer) to charge end-users on Google Play or the Apple AppStore.

Killer Selling Point: Includes 50+ Pro Stage and Studio Tools Workbench

Unlike standard chord book apps, Chordia gives musicians an entire utility belt of over 50 professional stage, acoustic, and audio engineering calculators and simulators right out of the box:

• Chromatic Guitar Tuner: Real-time high-precision pitch gauge with frequency cent indicator (E4, A4, D4).
• ⏱️ Stage Metronome and Tap Tempo: Accurate BPM calculator with visual stage strobe flash.
• ️ Acoustic SPL Decibel Meter: Real-time microphone sound check meter with stage feedback alerts (45 dB Cafe to 115 dB Drum Max).
• ️ Smart Capo Calculator: Instant key transposer and fret position finder for target keys.
• ⭕ Circle of Fifths Interactive Wheel: Harmonic key finder, relative minor/major mapping, and diatonic chord chart.
• Smart Chord Copilot: “AI-inspired” harmonic progression predictor and songwriting assistant. (Note: This feature is fully offline and algorithm-based. It does NOT use any external AI APIs and incurs NO usage costs for the end user).
• ️ Rig and Pedalboard Architect: Design virtual signal chains, check pedal buffer health, and calculate power consumption (mA).
• ️ Studio Delay Calculator: Calculate precise millisecond (ms) and frequency (Hz) delay times directly from song BPM.
• Gig Logbook and Performance Archive: Track show dates, venue earnings, setlists, and stage evaluation notes.
• Guitar Maintenance and Wood Humidity Tracker: Log string age corrosion schedules and acoustic wood relative humidity (RH 40-60%).
• Plus 40+ Additional Specialized Tools: Fretboard Note Finder, String Tension Calculator, Barre and Jazz Voicing Finder, Setlist Energy Pacing Analyzer, Stage Plot Input List Generator, Tour Gas and Travel Budgeter, EPK Readiness Checklist, Performance Contract and Rider Builder, Merch Profit Margin Calculator, Streaming Royalty Estimator, Studio Room Mode Calculator, Preamp Gain Staging Meter, Reverb Decay RT60 Estimator, Audio File Storage Size Calculator, and much more!

Key Core Capabilities

• True Offline-First Architecture (Drift SQLite): High-speed local database supporting thousands of songs, tags, setlists, and band rosters without requiring an active internet connection.
• Instant Key Transposer (# / b): Transpose entire chord sheets with sharps or flats instantly. Original keys are preserved while stage transpositions compute dynamically.
• Setlist Builder and AirSync Stage QR Broadcast: Assemble gig timelines, add intermission break markers, and generate an offline P2P QR code that bandmates can scan right on stage to copy charts in seconds!
• Complete Google AdMob and European UMP GDPR Consent: Pre-configured UmpConsentManager checks EEA/UK privacy options on initial startup (SplashScreen) and provides a persistent management button in SettingsScreen to ensure 100% compliance with Google Play and AdMob guidelines.
• Secure Zero-Asset API Key Management: Built following strict enterprise security standards using compile-time --dart-define and String.fromEnvironment() without insecure environment asset files that can be extracted from APKs.
• Multi-Language and Global Localization: Comes pre-loaded with 6 complete native dictionaries: English, Bahasa Indonesia, Español, 日本語 (Japanese), Deutsch (German), and Français (French).
• Ready Android Build Configuration: Configured for minSdk 23, targetSdk 36, and compileSdk 36 with ProGuard/R8 code optimization enabled and secure signingConfigs in build.gradle.kts guarded by a protective GradleException.

What You Will Get in the Download Package

• Full Flutter Source Code (Dart) for Android and iOS (100% included under Regular License).
• Comprehensive, Step-by-Step Technical Documentation (documentation.html) with embedded Vector UI Mockups and Schema Migration Guides.
• Official Flutter SDK Installation links and instructions for complete beginners (https://docs.flutter.dev/get-started/install).
• Pre-configured Riverpod 2.x State Management, Drift SQLite Database, and AdMob/UMP integration architecture.

Important Warning Regarding External Services

Please Note: This source code integrates with external third-party services. You are required to create and configure your own separate accounts and provide your own ID’s for Google AdMob and Google Play / Apple App Store Billing.

Cost Disclaimer: Buyers are solely responsible for any potential usage costs, developer account fees, or billing associated with publishing on external app stores. Please review their respective pricing tiers before deploying your app to production.

7 Top Highlighted Selling Points

1. 50+ Pro Stage and Studio Tools Workbench (Tuner, Metronome, SPL Meter, Circle of Fifths, Rig Architect, etc.).
2. Offline-First Song Browser and Smart Key Transposer (# / b and Capo calculator).
3. Setlist Builder with Offline P2P AirSync Stage QR Code Broadcast.
4. Complete Google AdMob + European UMP GDPR Consent Management (UmpConsentManager).
5. Native 6-Language Localization (English, Indonesian, Spanish, Japanese, German, French).
6. Drift SQLite Database with safe backward-compatible model parsing and schema migration flexibility.
7. Buyer-Ready Release Pipeline with minSdk 23 / targetSdk 36 and secure --dart-define API obfuscation.