App Overview

G-Bowl icon

G-Bowl

Takahiro Ike · Navigation

G-Bowl is a training and analysis tool designed to improve driving skills, whether for comfortable driving, circuit racing, or drift driving.

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
1 ratings · Top 5%

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 included16 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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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.

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Rork plan preview for G-Bowl: map the core Navigation 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 offline maps and cached searches.

Assumption to check: Limited offline functionality

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to customize favorites and profiles.

Assumption to check: Lack of user personalization options

Validate with people who use this workflow before building.

Hypothesis 3

Add social sharing for alleys and user reviews.

Assumption to check: No integration with social features

Validate with people who use this workflow before building.

Hypothesis 4

Enhance onboarding to clarify premium features.

Assumption to check: In-app purchases not clearly explained

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

G-Bowl is a training and analysis tool designed to improve driving skills, whether for comfortable driving, circuit racing, or drift driving. With features that provide audio cues and warning sounds based on G-force intensity, it is also highly effective for professional driver training, including skills testing for bus and taxi drivers. In addition to recording G-forces experienced during driving, G-Bowl also logs GPS location data, speed, yaw rate, and jerk, making it a powerful data logger for driving analysis. Furthermore, the app offers various features such as diagnostic and warning functions, driving data editing, and data sharing options (email, Excel export, etc.). For more detailed product information, please visit the official webs: https://en.ifulsoft.com/ MAIN FUCTIONS - Data logger function with G-force measurement and GPS information for circuit use - Display of G-force trajectory, G-meter, and real-time graph - Overlay display of speed, yaw rate, jerk, and raw G-force data - Easy mode available for anyone to use with a single button - G-force strength indicated by sound pitch (know the G-force without looking at the screen while driving!) - Warning sound when G-force or jerk exceeds the limit - Cornering G-force scoring function - Record, playback, analyze, cut-edit, and compare two driving logs - Auto-pause (automatically pauses and resumes log recording at traffic lights) - GPS map display, driving line, drift angle, and ghost car display - Share driving logs (via AirDrop, email, cloud, etc.) - Export in CSV format compatible with PC (Excel, etc.) - Supports Bluetooth external GPS units USER SUPPORT Please contact us via the Help button or the "Support" on the official website. We also welcome inquiries before purchase. EASY MODE USAGE INSTRUCTION This is a simple warning mode that can be used with one button. Press the [MODE] button at the bottom right of the screen to switch to "Red Card Mode." Then, just set your smartphone in the holder and press the button to select your car model. Drive while listening to the G-force strength and try to avoid triggering the warning sound. This mode is recommended for those who are not good with machines or who want a quick way to train for the second type of certification. HOW TO USE NORMAL MODE 1.Preparation Place your smartphone in the direction of the car's movement (it can be upright for better visibility). The most important thing is to choose a location with minimal vibration. It is recommended to place it on a stable surface like the floor or center console. (The dashboard or smartphone stand is not recommended due to high vibration.) 2.Level Set Park the car on a level surface and press the [Calibrate] button to record the level position. 3.Driving & Recording Once preparation and level set are complete, press the [Start Driving] button to begin driving. After finishing the drive, press the [Stop] button to save the data. 4.Log List Press the [Log List] button at the top right of the screen to display a list of saved driving logs. You can touch a log to play, share, or delete it. 5.Log Playback In the log playback screen, you have options for playback, comparing two data sets, editing, and display options. You can touch the graph to play/pause, and pinch/drag to change the scale. Important: If the graph appears jagged even when driving on a smooth paved road, it means your smartphone is picking up vibrations from the car. Please place your smartphone in a stable location to capture a clean graph. (You can also adjust the "Noise Filter Level" from the [Settings].) SETTINGS Press the [Settings] button in the App to open the settings screen. There are over 50 settings available. For more details, please refer to the [Help] button or visit the official website . https://en.ifulsoft.com/

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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

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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.

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BUILD KIT DIFFICULTY
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From the Build Kit assessment.

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