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.
GrappleBell is a simple, no-nonsense timer and scoreboard built for training and competition, especially Jiu-Jitsu and wrestling
$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.
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.
GrappleBell is a simple, no-nonsense timer and scoreboard built for training and competition, especially Jiu-Jitsu and wrestling. Set your rounds and go. TRAINING TIMER • Choose rounds, round length and rest, or load a Quick Start with one tap • Full-screen, color-coded display you can read from across the mat: orange to get ready, green rolling, amber near the end, red for rest • Landscape mode with a giant time and the controls on the side, perfect for mirroring to a TV or propping up across the room • A real ring-bell sound to start and end every round, a warning clapper before the round ends, and countdown beeps for the last seconds of rest • Pick your alert sound (Classic Ring Bell, Deep Bell, Air Horn, Buzzer, Chime), with a volume slider and test button • Pause, stop or skip at any time • Save your own Quick Starts: Positional Sparring, Open Mat Rolls, Comp Prep, Shark Tank, Drilling, or anything you make • Tap any time to dial it in with a scroll wheel COMPETITION TIMER FOR EVERY STYLE • Choose your rules: IBJJF, ADCC, JJWL, NAGA No-Gi, Fuji BJJ, UFC BJJ, Freestyle Wrestling, Folkstyle Wrestling, or a simple +1 / -1 scoreboard for local and regional tournaments • Each ruleset has its own score buttons, match lengths, periods and breaks: belt times for BJJ, USA Wrestling age-division periods, NAGA division times, ADCC qualifier and final formats • ADCC: scoreless first half, minus points for penalties, and overtime • Wrestling: takedowns, reversals, escapes, near falls and exposure, penalty points for your opponent, and technical superiority • Two-athlete scoreboard with editable names, plus advantages, penalties and wins by submission or pin • Optional IBJJF penalty rules: the 2nd penalty gives your opponent an advantage, the 3rd gives them 2 points, and the 4th is a disqualification • Corrections and undo at any time • Landscape layout puts both scores and the clock on screen at once Rules differ by event and year, so always check your event's rulebook. BUILT FOR THE GYM • Keeps the screen awake while a timer is running • Round alerts still fire if your phone locks or the app goes to the background • Louder sounds, with sound and vibration switches in Settings • Dark, high-contrast design • No account, no ads, no tracking
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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.