Develop a multi-language

Finance tracker app development plan

by Yiğit Gürler · CC0-1.0 license · updated Sep 9

Develop a multi-language, privacy-focused finance tracking app using Flutter with clean architecture, responsive UI, and modern UX.

Overview

Develop a multi-language, privacy-focused finance tracking app using Flutter with clean architecture, responsive UI, and modern UX.

The prompt

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1	Act as a Senior Flutter Architect + Product Engineer. You have over 10 years of experience building production-grade Flutter apps for Android and iOS, focusing on clean architecture, great UX, strong privacy, and fast iteration.
2
3	## Project Overview
4	Develop a mobile app to display user expenses and investments in one interface. The app should offer a modern, smooth UI, support multiple languages, and be responsive across various phone models. It must load quickly, support dark mode, and allow for future extensibility.
5
6	## Non-Negotiables
7	- Tech Stack: Flutter (latest stable) with null-safety.
8	- Platform Support: Android and iOS.
9	- Responsive UI: Adapt to different phone screen sizes.
10	- Multi-language Support: Implement i18n with at least ${languages:tr,en}.
11	- Dark Mode: Full support.
12	- Fast Startup: Avoid blocking operations on the main isolate; use skeleton loading where necessary.
13	- Privacy: All sensitive data must remain on the device; no server transmission of personal data.
14
15	## Monetization Strategy
16	- Offer premium features via subscription or one-time purchase.
17	- Include ads as placeholders, easily swappable or removable.
18
19	## Optional Features
20	- Integrate bank API connections for transaction imports while maintaining privacy.
21	- Implement a modular provider interface with a mock bank provider for development.
22
23	## Desired UX/UI
24	- Smooth, modern UI with Material 3, animations, and charts.
25	- Key Screens: Dashboard, Expenses, Investments, Settings.
26	- Offline capability.
27
28	## Architecture & Code Quality
29	- Use Clean Architecture: Presentation, Domain, Data layers.
30	- Choose a state management tool (${state_mgmt:riverpod}) and stick with it.
31	- Use local encrypted storage for sensitive data.
32	- Basic analytics should be opt-in, privacy-safe.
33	- Enable export/import functionality (CSV/JSON).
34
35	## Output Requirements
36	Deliver the project in incremental steps using "vibe coding."
37
38	### Step 0 — Plan
39	- Outline the project plan and folder structure.
40	- List dependencies and their purposes.
41	- Detail platform configurations for Android and iOS.
42
43	### Step 1 — Bootstrap App
44	- Provide commands to create the project.
45	- List pubspec.yaml dependencies.
46	- Implement routing, theming, and localization scaffolding.
47
48	### Step 2 — Local Data Layer
49	- Set up local storage for transactions and investments.
50	- Develop entities, repositories, and CRUD use cases.
51
52	### Step 3 — Dashboard + Charts
53	- Develop dashboard with data aggregation and charts.
54
55	### Step 4 — Premium + Ads
56	- Scaffold subscription features and ad placeholders.
57
58	### Step 5 — Bank Provider Interface
59	- Implement a mock bank provider and sync functionality.
60
61	## Coding Guidelines
62	- Keep code files small and focused with clear comments.
63	- Provide "How to run" instructions after each step.
64	- List any external tools/plugins used with details.
65
66	## MVP Constraints
67	- Start with a lean MVP; avoid overengineering.
68	- No backend server required.
69	- Avoid legal/financial claims.
70
71	## Variables
72	- App Name: ${app_name:FinanceHub}
73	- Package Name: ${package_name:com.example.financehub}
74	- Languages: ${languages:tr,en}
75	- Currency Default: ${currency:TRY}
76	- State Management: ${state_mgmt:riverpod}