Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
Tarsi - Your Personal Finance Companion
$4.99 · In-app purchases
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Tarsi - Budget Tracker: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Assumption to check: Difficulty in linking bank accounts securely
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited budget tracking features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inadequate transaction categorization
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No reminders for bill payments
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tarsi - Your Personal Finance Companion A simple yet powerful finance app that helps you track everything in one place, from daily expenses to long-term goals. Whether you’re just starting or already managing multiple accounts, Tarsi keeps things clear, organized, and easy to use. SEE YOUR MONEY CLEARLY Track your expenses and income in seconds. Monitor balances across cash, bank accounts, credit cards, and investments, all in one place. See your net worth in a single screen and understand exactly where your money goes with clean, simple breakdowns. You can also create investment accounts for US stocks and crypto, with access to the latest market data so your portfolio stays up to date without manual tracking. Tarsi supports light and dark mode, so you can use it comfortably anytime, anywhere. TALK TO TARSI (YES, EVEN OFFLINE!) Just say it. Tarsi handles the rest. Log expenses, transfers, and income by typing or using your voice. You can say things like “Starbucks 250”, “Salary 30k”, or “Paid credit card 5k last week” and Tarsi will understand and record it instantly. It works offline, so your data never needs to leave your device. You can also attach images or scan receipts using OCR, so your transactions are not just recorded but documented. PLAN AHEAD WITH CONFIDENCE Forecast your cashflow, track recurring bills, installments, and subscriptions, and view upcoming payments alongside expected income in one timeline. You can quickly tell if you can afford something before spending. STAY ON TOP OF YOUR FINANCES Set budgets with categories and subcategories and track your progress visually. Manage savings goals, monitor debts, and keep track of money owed to you. Tarsi includes ready-made bank account templates, so you can quickly add your accounts with just a few taps and start tracking right away. SIMPLE FOR BEGINNERS. POWERFUL FOR ADVANCED USERS Tarsi is easy to start with, even if you’ve never used a finance app before. As you grow, Tarsi grows with you. From budgets and goals to cashflow forecasting, debt tracking, installment tracking, and detailed insights, everything you need is already built in. CREATE MULTIPLE PROFILES Tarsi allows you to create multiple profiles, whether for personal use, family, or separate business accounts with built-in tools. GET FEEDBACK AND GROW YOUR MONEY Tarsi doesn’t just track. It helps you improve. Every time you log an expense or income, Tarsi gives you simple, helpful feedback so you understand how that decision affects your finances. Over time, it learns your patterns and gives you tips and insights to help you spend smarter, save better, and stay consistent. QUICK NOTES AND DAILY SUMMARY Use quick notes to list upcoming expenses, reminders, or anything you don’t want to forget. Tarsi also gives you a daily summary of your income and expenses so you can quickly review how your money moved without digging through your history. BACKUP, EXPORT, AND FULL CONTROL Your data is always yours. Tarsi automatically saves daily backups on your device so you don’t lose your data. You can export everything anytime as CSV or JSON, making it easy to move, review, or keep your own records. You can also generate income and expense statements for a selected period whenever you need them. PRIVATE BY DEFAULT Your financial data stays with you. Tarsi does not require an account, does not track you, and does not send your financial data to the cloud. Everything runs locally on your device. WHY TARSI? Tarsi is inspired by the Philippine tarsier, a small endangered animal known for its large, watchful eyes. Just like the tarsier, Tarsi helps you see your finances clearly. It gives you a full, honest view of your money so you can make better decisions every day, while also raising awareness about this unique animal and the importance of protecting it. Start tracking your money the right way. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.