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.
Put the routine you are learning next to yourself, and dance.
$1.99
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.
Put the routine you are learning next to yourself, and dance. StepMirror shows a reference video and your front camera on one screen at the same time. Drag the dividing line to change how much space each one gets. Push it all the way to the edge and the other one becomes a small floating window you can move anywhere. There are no layout menus - one line does it all. Line up several clips at once. The eight-count drill, the chorus, the full run - pick them all and they play in order. Leave it looping the one part you keep getting wrong, or loop the whole set and just keep going. On iPad it opens up properly: the playlist stays on the left, the reference and you sit side by side at close to full size, and every speed is one tap away. Stand it on the floor and dance. Slow the reference down to a quarter speed without the music dropping in pitch. Flip the reference left-to-right when you learned the steps facing your teacher. Flip yourself, or don't - your camera is mirrored by default, like a studio wall. Record what you see. Not a separate export, not a different crop - exactly the screen you were looking at, with the reference audio on it. Watch it back later, step through it frame by frame, and save it to Photos if you want to keep it. Everything stays on your device. No account, no upload, no ads, no subscription. You bring your own reference videos from your library or files - the app never sends them anywhere. - Reference video and front camera together, on one screen - Drag the divider: side by side, stacked, or picture-in-picture - Queue up several clips and play them back to back - Loop one clip, loop the whole list, or don't loop at all - Built for iPad: playlist always visible, both videos stay big - 0.25x / 0.5x / 0.75x / 1x, with pitch-corrected audio - Mirror the reference and yourself independently - Record the composed screen with the reference audio - A-B loop on the hard eight counts, per clip - Camera-only takes when you just want to check yourself - Frame-by-frame review of everything you recorded - Works without camera permission (playback still does everything) - One purchase. No subscription.
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.