# How to Vibe Code Your Own PocketSmith (and Stop Paying for It) > Know where your money is going - Site: https://pocketsmith.com - Category: Personal Finance & Budgeting SaaS - Verdict: **Solid side project** (68/100 vibecodeable) - Estimated effort: 2-3 weeks part-time ## Verdict Build a personal subset with manual CSV imports and a custom projection engine, but keep paying if you rely on live automated bank feeds across thousands of global institutions. PocketSmith's primary commercial moat is its vast web of upstream bank aggregator integrations and 17 years of hardened edge-case handling around multi-currency ledger math. However, for a personal clone, you can entirely bypass aggregator licensing headaches by building a robust manual CSV import pipeline and an event-sourcing projection engine. The hardest part for an AI coding agent will be writing the temporal math engine that computes future daily balances over decades of recurring income and mortgage events without hitting memory or performance walls. If you only want a local, private financial simulator that you feed manually via bank exports, vibecoding this is a rewarding 2-week project. ### What you can't replicate - Direct automated bank feeds across 14,000+ global financial institutions without paying commercial aggregator fees - The exact regulatory compliance and multi-jurisdiction data privacy infrastructure of a 17-year fintech company ## What it does A comprehensive, calendar-centric personal finance and budgeting software featuring long-term cash flow forecasting, multi-currency support, and customizable dashboards. ### Core features - Manual transaction logging and CSV/OFX import - Temporal cash-flow projection engine (recurring events, compounding interest up to decades) - Interactive budget calendar interface for scheduling bills and paychecks - Multi-currency support with automated daily exchange rate conversions - Net worth tracking including assets, properties, and liabilities - Custom dashboards and category-based reporting ## The business ### Pricing - Basic: Free - Foundation: $9.99/mo - Flourish: $16.66/mo - Fortune: $26.66/mo Founded 2008. Team size: ~25 employees. ## The hard parts - Building a temporal ledger projection engine that calculates daily balances across 10-60 years without performance bottlenecks - Handling multi-currency valuation adjustments using historical and live exchange rates without floating-point inaccuracies - Designing an intuitive drag-and-drop or grid-based calendar UI for recurring financial events ## How to vibe code PocketSmith ### Prerequisites - Node.js (free): Required runtime for building and running the Next.js full-stack application. - GitHub (free): Code repository hosting and deployment integration. ### Recommended AI tools - Claude Code: Best-in-class agentic coding tool for scaffolding the full-stack database schema, ledger math engine, and calendar UI. - Cursor: Ideal for fine-tuning complex React calendar components and charting dashboards with inline visual feedback. ### Stack - Frontend: Next.js with Tailwind CSS and React FullCalendar components - Backend: Next.js Server Actions and API Routes - Database: Turso (SQLite at the edge for lightning-fast local ledger queries) - Auth: better-auth - Payments: none - Other: Vercel AI SDK for natural language transaction categorization prompts, Decimal.js for precise financial arithmetic avoiding floating-point rounding errors ### Hosting - Cloudflare (Hosting the Next.js frontend and Turso edge SQLite database with zero ongoing server costs.): $0/mo ### Build guide 1. **Project Scaffolding & Database Schema** — Initialize the Next.js application with Tailwind CSS, configure Turso SQLite via Drizzle ORM, and set up better-auth for secure single-user local access. ``` Scramble up a new Next.js project with TypeScript, Tailwind CSS, and Drizzle ORM configured for Turso SQLite. Create database schemas for users, accounts (with currency fields), categories, transactions (amount stored as integer cents using Decimal.js logic), and recurring budget scenarios (frequency: daily, weekly, monthly, yearly, start_date, end_date). Implement better-auth for secure local authentication with email/password and session handling. Ensure all monetary values use integer arithmetic or strict decimal handling to prevent rounding errors. Write automated migration scripts and verify the schema builds cleanly without errors. ``` 2. **Transaction Management & CSV Importer** — Build a flexible CSV import pipeline that maps columns from major bank exports (CSV/OFX) into the transaction ledger, with category assignment and search. ``` Build a robust CSV transaction import feature in Next.js. Create a multi-step UI wizard where users upload a bank CSV export, map columns (date, description, amount, account), preview parsed rows, and bulk-insert them into the database. Implement server-side duplicate detection based on date, amount, and description hash. Build a transaction list view with multi-column filtering, search, category assignment, and inline editing. Use Server Actions for all database mutations and validate payloads with Zod. ``` 3. **Temporal Cash Flow Forecasting Engine** — Develop the core financial projection algorithm that simulates daily account balances years into the future based on recurring rules and current balances. ``` Implement the core cash-flow forecasting engine. Create a backend calculation service that takes an account's current balance, historical transactions, and active recurring budget events (paychecks, rent, subscriptions) to project daily balances over a user-defined horizon (up to 30 years). Handle recurrence rules (daily, weekly, monthly, custom intervals) efficiently using date-fns. Optimize the calculation loop to execute in-memory or via SQL recursive CTEs so projections for 10 years of daily points render in under 500ms. Expose an API endpoint returning daily projected balance arrays for charting. ``` 4. **Interactive Budget Calendar UI** — Build an interactive calendar view displaying scheduled bills, income events, and daily projected closing balances. ``` Build an interactive budget calendar view in React using Tailwind CSS and FullCalendar or a custom grid. The calendar must display historical transactions on past days and projected recurring income/expenses on future days, showing the running daily bank balance at the bottom of each calendar cell. Allow users to click any day to inspect cash flow details, add ad-hoc budget adjustments, or toggle what-if scenarios on and off to see their impact on future balances. ``` 5. **Multi-Currency & Exchange Rate Handling** — Add support for multi-currency accounts with automated daily exchange rate fetching and net worth aggregation. ``` Extend the account and transaction models to support multi-currency assets and liabilities. Integrate a free daily exchange rate API (or fallback mock rates) via a scheduled server action to update currency conversion rates. Build a Net Worth dashboard widget that aggregates balances across different foreign currency accounts into a single base currency using latest historical exchange rates. Ensure all multi-currency rollups calculate accurately and display clear conversion indicators in the UI. ``` 6. **Custom Dashboards & Reporting** — Assemble customizable reporting dashboards with income/expense breakdowns, net worth charts, and cash flow statements. ``` Build a flexible dashboard and reporting module. Create responsive charts using Recharts for Income vs Expense statements, Net Worth trajectory over time, and Cash Flow monthly summaries. Allow users to create custom dashboard widgets grouping specific accounts and budget categories together. Add polish with loading skeletons, error boundaries, and dark mode support across all views. ``` ### Cost vs paying **Starting costs (one-time):** - AI Coding Assistant (Claude Pro / Cursor): $20.00 - Total: $20.00 one-time **Ongoing costs (monthly):** - Cloudflare / Turso Edge Hosting: $0.00 - Total: $0.00/mo - Paying for the SaaS instead: $16.66/mo (Flourish Plan) - Build time: 25-35 hours - AI tool credits: $20 (one month of Claude Pro / Cursor) - Break-even: 1 month ## Sources - [PocketSmith Official Website & Features](https://pocketsmith.com) - [PocketSmith Security & Feed Architecture](https://pocketsmith.com/security) - [PricingSaaS Intelligence Platform – PocketSmith Pricing](https://pocketsmith.com/pricing)