App Overview

Checkpoint Clock icon

Checkpoint Clock

David Bireta · Sports

the richta rally checkpoint clock is an application designed as a timing device for use at checkpoints during time-speed-distance road rallys

$3.00 · In-app purchases

PRICE
$3.00
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.0
1 ratings · Top 30%

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.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

Screen plan

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.

Differentiate and validate

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 SYSTEM PROMPT
Rork plan preview for Checkpoint Clock: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

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

Implement advanced filtering and sorting options for past sessions.

Assumption to check: Limited session history management

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to create custom timers with labels and colors.

Assumption to check: Lack of customizable timers

Validate with people who use this workflow before building.

Hypothesis 3

Add audio feedback for lap saving and timer start/stop.

Assumption to check: No audio cues for lap recording

Validate with people who use this workflow before building.

Hypothesis 4

Enable users to share their session history with friends or on social media.

Assumption to check: No sharing functionality

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

the richta rally checkpoint clock is an application designed as a timing device for use at checkpoints during time-speed-distance road rallys. it can also be used as a time reference for class b or "seat of the pants" rally classes. when the "split" button is pressed the clock records the time of the split in a scrollable log area at the bottom of the display. an associated car number can optionally be recorded as well. log entries can be reviewed by scrolling the screen and individual log entries may be deleted. the clock can be dynamically changed to record in seconds, tenths of a second, or hundredths of a minute (decimal minutes). a facility is provided to adjust the time of day clock independently of the devices clock so that the app can be synchronized to an external time reference without changing the device's clock. *** note *** the accuracy of the clock over time, sometimes called drift, depends on the accuracy of the underlying hardware.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
react-navigation
expo-av
react-native-gesture-handler
BUILD KIT DIFFICULTY
Starter

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.