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.
WhoIsThis is your own private caller ID, a phone-book notepad, that lives entirely on your iPhone, kept completely separate from your real Contacts.
$0.99
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.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
WhoIsThis is your own private caller ID, a phone-book notepad, that lives entirely on your iPhone, kept completely separate from your real Contacts. Save the people who matter with a category, notes, photos and a unique ID. When one of them calls, iOS shows Category, Name, Notes, right on the incoming-call screen — so you know who it is and why they're calling, before you answer. Never guess who "the plumber," "the recruiter," or "that seller from last week" is again. Tag them once, and the context comes to you on every call. WHAT YOU CAN DO • Keep a private phonebook, not an address book — everything stays in WhoIsThis and never touches your iPhone Contacts. • See who's calling your way — your category, name, note and ID appear on the native call screen before you pick up. • Organize by purpose — group contacts into categories like Plumbers, Recruiters or Buyers. • Add notes and photos — the call screen even flags when a contact has images to review. • Give everyone an ID — look any contact up instantly from the IDs tab. • Add an emoji to a name to make it stand out on the call screen. • Pin and unpin — choose exactly which contacts show up as caller ID. PRIVATE BY DESIGN WhoIsThis works completely offline. No account, no sign-up, and your data is never sent to the cloud or shared with other apps. Back up and restore any time from Settings — the file stays with you. GET STARTED 1. Add a category and a few contacts. 2. Open Settings > Phone > Call Blocking & Identification and turn on WhoIsThis. 3. Saved numbers now show your label when they call. WhoIsThis shows caller ID only for the numbers you save. It doesn't identify unknown or spam callers, and it never reads or uploads your phone's contacts or call history.
Written user reviews are not shown here. Check current App Store reviews >
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.