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.
ENVELOPE BUDGETING & RETIREMENT PLANNING
$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 By Envelope: 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 often find it difficult to manage multiple envelopes effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Budget tracking may lack automation.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Users feel overwhelmed with data entry.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited linked account options.
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.
ENVELOPE BUDGETING & RETIREMENT PLANNING. COMPLETELY PRIVATE. (Budgeting) By Envelope pairs two financial tools in one calm app: classic envelope budgeting to give every dollar a job, and an honest retirement projection to answer one question — will the money last? Everything is computed and stored on your own devices. No accounts, no servers, no tracking. GIVE EVERY DOLLAR A JOB Split your income into envelopes — housing, groceries, retirement, a vacation fund — and bring your unallocated buffer to $0. • Drag a row's bar to re-allocate an envelope in real time • Live income, allocated and buffer at the top, with an over-allocated warning • Sort by name, category or amount — or arrange by hand • Track one person or a couple, side by side CHARTS THAT MATCH THE NUMBERS • A donut groups your envelopes by category, with the live share of income and dollars in the center • Tap any slice to focus it • A bar view ranks envelopes and breaks them down per person for couples WILL THE MONEY LAST? Set your assumptions once, then compare claiming Social Security at 62, 65, 67 and 70 — each its own balance curve with a clear depletion age. • Investment return, inflation, taxes, ages, balances and benefits — every rate has a field and a slider • A year-by-year table shows the balance every December 31 • Overlay all four scenarios on one chart and scrub to read any balance • Plans that survive the full horizon show ∞ BUILT FOR COUPLES Switch to two-person mode and enter each person's income and amounts. Charts and totals break down by person. Switch back any time — Person 2's amounts simply hide, nothing is lost. PRIVATE BY DESIGN • 100% on-device computation — your money never reaches us • No account, no sign-up, no email, no password • No analytics, no ads, no third-party tracking SDKs • Optional iCloud sync through YOUR own private database — we never see it • Works fully offline CALM BY DEFAULT • Light "Paper" and dark "Ink" themes • Comfortable or compact density • Built-in categories — Expenses, Mortgage, Protected Goals, Retirement, Income Taxes, Safe-to-Spend and more — plus your own • No onboarding wizard; start budgeting in minutes ONE PLAN, EVERY SCREEN iPhone, iPad and Mac. A floating tab bar on iPhone, a sidebar on iPad and Mac — the same budget and projections everywhere, kept in sync privately through iCloud. WHO IT'S FOR • First-time budgeters who want to see where the money goes • Couples planning one shared budget • Near-retirees comparing Social Security claiming ages • Privacy-conscious people who won't hand their finances to a server • Anyone tired of subscriptions NO SUBSCRIPTIONS. NO ADS. NO CLOUD BACKEND. A one-time purchase that works across every Apple device you own. --- DISCLAIMER: By Envelope is a budgeting and planning tool, not financial advice. Retirement projections are scenarios built entirely from the assumptions you enter and are meant for comparison only. Past performance does not guarantee future results. Always conduct your own due diligence before making financial decisions. Requires iOS 17.0 or later.
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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.