TZAppify

Indie App Studio — Building Productivity & Lifestyle Apps in SwiftUI

Overview

TZAppify is my one-person indie studio focused on crafting beautiful, data-driven mobile experiences that solve everyday problems. Since January 2024, I have solo-ideated, designed, coded, and shipped 8 SwiftUI apps to the App Store—three of which broke into their category’s top-200 within 10 days of launch.


Fast Facts

Metric Value
Apps shipped (100 % SwiftUI) 8
Flagship ranking #18 Productivity (DoneTodo)
7-day retention lift +23 % after analytics-driven onboarding tweaks
CI / CD pipeline 1-click Fastlane → TestFlight → notarization


Key Achievements

  • Repeatable Product–Market Fit — After DoneTodo’s success (#18 Productivity), follow-up titles SparkDays (#112 Lifestyle) and WayLater (#169 Lifestyle) proved the studio’s ability to spot gaps, prototype fast, and attract users organically.
  • Modular Codebase — Built a set of Swift packages (Core Data + iCloud sync, analytics helpers, undo/redo engine) that cut release effort by ~80 % across new apps.
  • Data-Driven Growth — Instrumented Firebase Analytics + custom events; iterated on onboarding to raise D7 retention by 23 %.
  • End-to-End Ownership — Handle everything from Figma mock-ups and SwiftUI animations to App Store metadata, ASO, and promo videos.


App Portfolio

App Category Highlight
DoneTodo Productivity Grid-based time painter; undo/redo; retention analytics
SparkDays Lifestyle Habit tracker with coin-and-reward gamification
WayLater Lifestyle Time-capsule letters that unlock on a future date
3Calc Utilities Triple calculator with independent histories
Flipperly Education Flashcard SRS app with swipe-to-grade UX
FontMate Dev Tools iOS font explorer + SwiftUI snippet generator
+ 2 internal prototypes — Soft-launched; details coming soon


Technology Stack

  • Languages: Swift & SwiftUI (100 % native)
  • Architecture: MVVM + Combine, reusable Swift package modules
  • Persistence: Core Data + iCloud / UserDefaults JSON
  • Analytics: Firebase + custom event wrappers
  • CI/CD: Fastlane ▸ GitHub Actions ▸ TestFlight ▸ notarization
  • Design: Figma, SF Symbols, custom Lottie animations
  • ASO & Launch: App Store Connect, Apple Search Ads experiments, localized screenshots in 2 languages


Workflow

  1. Ideate — Identify a pain-point, sketch user journeys in Figma.
  2. Prototype — Build a proof-of-concept in SwiftUI within 48 h.
  3. Iterate — Ship TestFlight builds, gather analytics & qualitative feedback.
  4. Polish & Launch — Tighten animations, localize, submit to App Store.
  5. Grow — Track retention & funnel metrics, release weekly updates.


What’s Next

I’m expanding TZAppify’s toolkit—exploring Swift Data, Swift Concurrency diagnostics, and watchOS companions—while keeping the same obsession with delightful UX and measurable impact. If you’re interested in collaborations, feature ideas, or simply want to chat indie development, let’s connect!


Additional Resources