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.
RoundBlitz is the boxing interval timer designed for serious fighters
$5.99 · 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.
Rork plan preview for RoundBlitz - Boxing Timer: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
RoundBlitz is the boxing interval timer designed for serious fighters. No clutter. No ads. No subscriptions. Just massive, easy-to-read countdown digits and the sound of the bell. Whether you're shadowboxing at home, hitting pads with your coach, or sparring at the gym — RoundBlitz keeps your rounds tight and your rest honest. ONE PRICE. EVERYTHING INCLUDED. Buy RoundBlitz once and the whole app is yours forever. No subscription, no in-app purchases, no locked features, no ads. HANDS-FREE GESTURE CONTROL - Start, stop, restart, or skip a round with a hand sign to the front camera - Works with your gloves on, mid-combination, without breaking rhythm - Assign the signs you want: open palm, peace, fist, thumbs up, or pointing - Runs entirely on your device — camera frames are never recorded, saved, or sent anywhere TRAIN YOUR WAY - Set round duration, rest time, number of rounds, warning alerts, and prep countdown - Start from ready-made presets: Boxing Standard (12x3:00), Muay Thai (5x5:00), or Tabata (8x0:20) - Save unlimited custom presets for different training sessions DESIGNED FOR THE GYM - Giant timer digits visible from across the room — no squinting mid-round - Landscape mode turns your phone into a wall-mounted gym clock - Works in the background so you can play your own music while training - Haptic feedback for round changes when your phone is in your pocket SOUND LIKE FIGHT NIGHT - Six round alerts: authentic boxing bell, buzzer, whistle, air horn, vintage bell, and crowd claps - Warning alert before the bell so you know when to push harder - Spoken-clear countdown into the final seconds of every rest ON YOUR WRIST - Apple Watch companion app: start, pause, skip, and reset from your wrist - Wrist haptics and alerts on every round change - Keeps the watch screen awake through the workout and logs the session to Health AFTER THE BELL - Round-by-round workout summary with total work time, rest time, and estimated calories - Repeat the session with one tap PRIVATE BY DESIGN - No account, no sign-up, no trackers, no analytics - Everything stays on your device and the whole app works offline Privacy Policy: https://roundblitz.com/privacy.html BUILT FOR FIGHTERS RoundBlitz was designed by people who actually train. Every decision — from the oversized digits to the one-tap start — was made to keep you focused on your workout, not your phone. Compatible with iPhone, iPad, and Apple Watch.
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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.
Hypothesis 1
Assumption to check: Inaccurate tracking
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Generic workout plans
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social features
Validate with people who use this workflow before building.
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.