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.
Your photos already know where you've been
$2.99
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.
Your photos already know where you've been. Contrail reads their dates and locations, groups them into trips automatically, and turns your camera roll into a map — entirely on your phone. No tagging. No logging. No account. If you have any feedback, ideas, or requests, please just reach out through our support channel! We are a very small team and we want to continue making this product even better for you. WHAT YOU GET • A world map with every country you've visited filled in • Your trips, found automatically — grouped, titled and dated • Real stats: countries visited, % of the world, days away, photos taken abroad, etc. • A pin on every trip, and the route you actually travelled • Where to next — ideas for your next trip EVERYTHING STAYS ON YOUR PHONE Contrail has no servers, no account, and no analytics — your map is built entirely on your device. Your photos and your trips stay on your phone unless you choose to share them yourself. BUILT TO BE HONEST Every number Contrail shows is computed from your own library. Nothing is estimated. YOU KNOW BEST Automatic trip detection is very good, but not perfect. A stray photo someone sent you can land in the wrong place. So every trip is editable: rename it, fix its countries, add or remove photos, or delete it outright. And when you come back from somewhere new, one tap adds just the new photos without touching anything you've already corrected. REQUIREMENTS Contrail needs access to your photo library to read photo dates and locations. Photos without location data are simply skipped. Screenshots are ignored, so a screenshotted map doesn't turn into a country you never visited. Works fully offline. 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.