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.
The U.S
Free
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.
Your first Build Kit is free with a verified email.
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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
The U.S. Army Survival manual ATP 3-50.21, the definitive military field guide to staying alive in any environment, now in your pocket. NOT A GOVERNMENT APP. This independent app is not affiliated with or endorsed by the U.S. Army, the Department of Defense, or any government entity. OFFICIAL PUBLIC DOMAIN SOURCES • ATP 3-50.21 (2018): https://armypubs.army.mil/ProductMaps/PubForm/Details.aspx?PUB_ID=1005316 • FM 3-05.70 (2002), also FM 21-76: https://armypubs.army.mil/ProductMaps/PubForm/Details.aspx?PUB_ID=78014 • TC 21-3 (2025): https://armypubs.army.mil/ProductMaps/PubForm/Details.aspx?PUB_ID=1032109 • TB MED 508 (2026): https://armypubs.army.mil/ProductMaps/PubForm/Details.aspx?PUB_ID=1032535 • NOAA tide predictions: https://tidesandcurrents.noaa.gov/ • USGS topographic maps: https://www.usgs.gov/programs/national-geospatial-program/national-map No other U.S. Government source is used. Built for soldiers, preppers, hikers, hunters, and anyone who takes preparedness seriously. The techniques come from the Army manuals listed above. The full manual is free to read. A single one-time purchase unlocks Army Survival Pro. FREE: THE COMPLETE MANUAL Every chapter, covering every survival situation: - Survival Planning: the SURVIVAL acronym and survival mindset - Water Procurement: finding, collecting, and purifying water - Food in the Wild: Universal Edibility Test, foraging, trapping - Medical: MARCH protocol, wound care, improvised medicine - Fire: starting fire in any condition with any materials - Shelter: building field expedient shelters for any climate - Navigation: land nav without GPS, using stars, sun, and terrain - Signaling: SOS methods, signal fires, mirror signaling - Desert, Arctic, Jungle, and Sea survival techniques - Dangerous Animals: venomous snakes, insects, and predators - Poisonous Plants: identification with photos of the deadliest species FREE: ILLUSTRATED PLANT AND SNAKE GUIDES 100 illustrated edible plant entries covering 84 species, with the original field manual photography, plus venomous snakes by region. The poisonous plants chapter shows clear photos of the world's most dangerous species, including Water Hemlock, Deadly Nightshade, Manchineel, and Monkshood. ARMY SURVIVAL PRO: ONE TIME PURCHASE OFFLINE MAPS THAT WORK WITH NO SIGNAL - Download map areas to your device before you lose service - Terrain with shaded relief and contour lines, so you can read the shape of the ground - USGS topographic maps across the United States - Satellite imagery where it is available - Waypoints, recorded tracks, and a compass that works without a data connection FIELD INTEL - Photo identification of 3,000 species, running entirely on your device with no signal: 2,000 plants and trees, plus 1,000 fungi and lichens - Wildlife map showing what lives where you are standing - Location aware survival intel for the ground around you STUDY AND REFERENCE - Study Guide with drills, flashcards, and mastery tracking - Full text search across every chapter and section - Bookmarks for one tap access from anywhere DESIGNED FOR THE FIELD - Works fully offline, with no signal and no Wi-Fi - Quick Reference panel for the most critical techniques - High contrast dark display, readable in low light and bright sun - No ads. No subscriptions. No account required. Be prepared. Stay alive.
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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.
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.
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.