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.
Fast
$4.99 · In-app purchases
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.
Fast. Plunge. Sauna. Breathe. One app, one price: no subscription, no ads, no account. Pick your stack, read the safety screen, and your first timer is running in under a minute. PBros is a set of timers for people who run a daily protocol. FAST • Live fasting timer with your exact end time • Presets: 16:8, 18:6, 20:4, OMAD, 24h, plus custom • Short phase notes for where you are in your fast (educational, not lab readings) • Forgiving streaks: one free rest day a week ("Rest day used, streak safe") • History saved on your iPhone COLD PLUNGE AND SAUNA • Plunge: 1–15 minute countdown in 30-second steps, with up to 5 rounds • Sauna: dry or infrared, 5–30 minutes, up to 5 rounds • Times logged to the second, plus a quick log for water or room temperature (°F/°C) and a note • Big, glanceable dry-side timers, also on Apple Watch CONTRAST • Auto sauna → plunge → rest rounds with loud cues at every switch • One-tap plans and built-in safety caps BREATH • Power Rounds: paced power breaths with a recovery hold. Sit or lie down on dry land, never in or near water. • Box, Long exhale and Sigh, with audio cues • Bedtime: slow, steady box breathing to wind down, with a dimmed screen and soft tones RECOVERY (optional Apple Health) • An on-device Recovery Score from HRV, resting heart rate and sleep, with a daily Push / Contrast / Rest suggestion • No Health access? A 10-second check-in works too • Log workouts and save sessions to Apple Health if you choose STACK • Morning, afternoon and evening reminders for the stack you choose (names only, no dosing advice) EVERYWHERE YOU LOOK • Live Activities and Dynamic Island for running timers • Home Screen widget with your live fasting time • Apple Watch app for Fast, Plunge, Sauna and Contrast YOUR DATA STAYS YOURS No account, no ads, no tracking. Your data stays on your device. One-time purchase. Every feature is included. No in-app purchases and no subscription. Important: Keep your iPhone and iPad dry. Don't take them into water, ice baths or saunas. Use Apple Watch if you want a timer close by. Do breath-hold rounds only sitting or lying down, never in or near water or while driving. PBros is not medical advice. Talk with a clinician before fasting or heat/cold practices if you're pregnant, breastfeeding, under medical care, or have been told not to fast. Intended for adults 18+.
Written user reviews are not shown here. Check current App Store reviews >
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.