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.
Invoice in seconds
$0.99 · 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 Simply Invoice: Invoice Maker: 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: Complex, confusing interface
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Slow bank connections
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Security concerns
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.
Invoice in seconds. Pay once, keep it forever. Simply Invoices is the cleanest, fastest invoicing app for freelancers and small businesses on iPhone, iPad, and Mac. One small payment unlocks everything — no subscription, no tiers, no per-invoice fees. Everything included, nothing held back There is no Pro plan, no upgrade prompt, and no renewal date. Every feature below is in the app from the moment you buy it, on iPhone, iPad, and Mac. Buy it once and it stays yours. Built for freelancers, contractors, and small businesses Whether you're a designer billing clients, a consultant tracking retainers, a tradesperson writing up jobs, or a sole trader who just needs to get paid — Simply Invoices handles it cleanly. Your business details prefill automatically on every new invoice so you never retype your name, email, or contact info. Create an invoice in under a minute • Add line items with quantities and unit prices • Automatic tax calculation — set your rate once, Simply Invoices does the maths • VAT, GST, and any tax rate supported — just enter the percentage • Bank transfer and cash payment methods built in • Currency shown in your local format automatically — no setup needed Always know where you stand Outstanding and collected totals are always visible on the main screen. Track every invoice from Draft through Sent, Paid, and Overdue. Archive old invoices to keep a clean list without losing the record. Your data, your way Export all your invoices to a backup file and save it to Google Drive, iCloud, Dropbox, or anywhere you store things. Import it on any other device — your data travels with you. Sort, search, and filter everything Find any invoice instantly. Filter by client, status, date range, or amount. Sort by newest, due date, or value. Nothing slips through the cracks. Cleaner than FreshBooks. Simpler than QuickBooks. Simply Invoices was designed from scratch to cut out the noise. No dashboards you don't need. No menus buried three levels deep. No plan you have to upgrade to. Just your invoices, right in front of you. One payment. Every platform. Yours to keep. Works natively on iPhone, iPad, and Mac including Apple Silicon — one purchase covers all three. Your invoices stay privately on your device. No account required to keep them, no renewal to forget, and no data held hostage behind a lapsed plan. Simply Invoices. Send it. Get paid.
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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.