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.
App Overview
Commonplace — Classic Books
Commonplace is a reading app for the classics, made the way good books are made: carefully, and to last.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
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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.
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A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
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- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Commonplace is a reading app for the classics, made the way good books are made: carefully, and to last. EDITIONS MADE WITH CARE More than 600 classics — fiction, poetry, drama, philosophy, history, science and scripture — in Commonplace’s own editions: real quotation marks and dashes, verse that keeps its lines, chapters you can move between, and footnotes that open where you are reading. Every text is checked word for word against its source. Open “About this edition” on any Commonplace edition to see where its text came from and every correction made to it. When an edition is improved, you can take the new issue and keep your notes, bookmarks and place. A PASSAGE WORTH KEEPING At noon and at midnight, Commonplace offers a new passage from the whole breadth of the catalogue. Keep it, write a note on it, or step from the passage into the book at the exact place it comes from. Home Screen widgets bring you the day’s passage and take you back to the book you are reading, and the Apple Watch app keeps the passage on your wrist. A PAGE FOR EVERY BOOK Before you open a book, its page tells you what it is, how it moves and where to begin, without giving anything away. Its Voices and Threads — the people in the book and the arguments it carries — arrive as you reach them. Each book’s page, its Voices and its Threads are AI analysis of the edition’s own text. YOUR LIBRARY, ON YOUR DEVICE Your library, notes, saved passages and reading places stay on your phone. There are no ads, no analytics and no accounts. Search your whole library, including the full text of every book, without anything leaving your device. SYNC, IF YOU WANT IT Turn on Sync with Google to keep your notes, saved passages and reading places the same on each of your devices. They are kept in a private folder of your own Google Drive that only Commonplace can use. Nothing is sent to Commonplace. MORE TO READ You can also import your own EPUB, plain text, HTML, Markdown, RTF, Word and FictionBook files, and DRM-free MOBI files. One purchase, the whole catalogue. No subscriptions, no in-app purchases, no ads.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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.
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
