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.
FlexCheck is a dead-simple budgeting app built for one thing: making sure you have enough in your account when every bill hits — especially when you're living paycheck to paycheck.
$9.99 · 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.
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Combine features and design from your favorite apps.
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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 FlexCheck: 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: Users find it difficult to track expenses accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Users desire better visual representation of financial data.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Users experience difficulty in managing multiple accounts.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Users feel overwhelmed by complex settings.
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.
FlexCheck is a dead-simple budgeting app built for one thing: making sure you have enough in your account when every bill hits — especially when you're living paycheck to paycheck. No bank logins. No syncing. No spreadsheets. Just your bills, your paychecks, and a clear answer to the only question that matters: "Will I make it to the next paycheck?" HOW IT WORKS • Set up your recurring income and bills once as a Template. Every new month is pre-filled automatically — no re-entering the same items. • As money moves, tap to clear each item. FlexCheck keeps a running total of exactly how much still needs to be in your account. • One "Needed in Account" number tells you, at a glance, whether you're covered. BALANCE EACH PAYCHECK Add your paychecks with their deposit dates and FlexCheck splits your bills by which check pays them — with a subtotal and a "left over" amount for each one. Instantly see if too many bills are stacked on a single check, so you can rebalance before you overdraft. This is the part most budgeting apps miss, and it's the heart of living check to check. FEATURES • Pay-period view — bills grouped by paycheck, each with its own subtotal and leftover • Bill reminders — get notified a few days before a payment, at a time you choose • Multiple templates — keep separate setups (a normal month vs. a holiday month) • Starting balance — enter what's in your account and see your projected balance after all bills • Autopay & due dates — flag autopaid bills and sort everything by the day it's due • Compare months — chart income vs. expenses over time and spot trends • Deposit dates — know exactly when each paycheck lands PRIVATE BY DESIGN Everything stays on your device. FlexCheck has no account, makes no network requests, and contains zero analytics, ads, or trackers. Your financial information never leaves your phone — because there's nowhere for it to go. MADE FOR Anyone on a tight, check-to-check budget who wants a fast, honest picture of their money without connecting their bank or logging every coffee. Download it and know, today, exactly what to keep in your account.
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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.