App Overview

Natural 20 icon

Natural 20

Jonathan Lord · Entertainment

Ideal for board games, war games and RPG's like Dungeons & Dragons

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.5
57 ratings · Top 15%

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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A product spec, screen plans, and build steps for your coding agent.

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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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Natural 20: map the core Entertainment 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

Allow users to customize abilities and stats more freely.

Assumption to check: Limited customization options for character sheets

Validate with people who use this workflow before building.

Hypothesis 2

Implement a more unified rolling experience with better animations.

Assumption to check: Inconsistent rolling experience across different dice types

Validate with people who use this workflow before building.

Hypothesis 3

Create a more intuitive interface for viewing and switching between characters.

Assumption to check: Difficulties in managing multiple characters

Validate with people who use this workflow before building.

Hypothesis 4

Integrate social sharing options or community forums for users to connect.

Assumption to check: Lack of community features

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

Ideal for board games, war games and RPG's like Dungeons & Dragons. Natural 20 is a dice rolling app which handles single and multiple dice rolls, and much more. Its comfortable to use, saves time, and its easier than carrying a box of dice to each game! ***************** Feature Summary ***************** - Handles single and multiple dice rolls. - Default dice are D2, D4, D6, D8, D10, D12, D20 and D100. - More dice can be added, with different colours and sides. - Multiple Dice can be easily filtered and rerolled. - Range Die gives you a random number in any range. - Custom Die lets you choose the faces of the dice. - Direction Die points you in a random direction. - My Dice allows you to store custom sets of dice. - Offers a Dice Calculator, Word Dice, Teachers Dice, and more! - Stores a history of all your rolls. - Custom probability distribution plots. - iPad, iPhone and Apple Watch support. - Voice Over support - Dark mode support - Cheaper than buying lots of dice! *************** Feature Descriptions *************** Natural 20 has fifteen screens of features, to help you manage your dice. Here's a brief description of them. ~ Quick Roll Simply pick your dice, and you have an instant result. Ideal for Dungeons & Dragons, Quick Roll offers the following eight dice; D2, D4, D6, D8, D10, D12, D20 and D100. ~ Multiple Dice In multiple dice mode you can mix your dice together as you please. This mode has been designed with Warhammer in mind, and you can easily filter the dice at the touch of a button. The remaining dice can be rolled again to find out how many enemies you wound. Stats, such as average and the sum, are displayed for each roll saving you counting on screen. Buttons are provided to remove the highest or lowest rolls, as well as any range in between. ~ Calculator Great for large numbers of dice, or combinations with a modifier. ~ Roll History Natural 20 keeps track of all your rolls, so you can prove you actually rolled that 20! The dice stored in your history can be easily re-rolled and filtered. You can move the dice around the screen, and it will remember your order. ~ Custom Die Custom Die lets you choose the sides of the dice, by separating them with commas. Natural 20 will pick a single item, or order them randomly into a list. ~ Range Die Pick any range, and receive a random number. Your three most rolled ranges are available at the press of a button. ~ Teachers Die Handy for the classroom, this die will be helpful for Maths and English. You can use it to randomly pick letters, numbers and mathematical operators. When picking letters you can specify if they are upper or lowercase, and also pick between vowels and consonants. ~ Colour Die This will give you a random colour, just run your finger across the screen like a paintbrush. Some basic information is displayed, such as the colour’s hex number, HSB, and RGB values. ~ Direction Die This will point you in a totally random direction with each spin. Swipe the screen to spin it, however you can only influence which way it spins, not the outcome! ~ Success Die Repeatedly rolls D6’s, discarding when they fail to meet a certain value. The total successes are displayed. ~ Word Die Keep collections of words, to randomise at a touch. Ideal for selecting locations and enemies randomly. You can even randomise your words as a whole list. ~ My Dice My Dice allows you to save your own collections of dice, along with a description and optional modifier. These can be easily searched through, and rolled from a single tap. ~ Dice Builder Chose how many sides your dice have, and their colours! ~ Distribution Distribution allows you to create probability distribution plots for specified dice. These will show you the percentage chance of rolling a particular face value, and you can compare actual rolls against theoretical results. However, large numbers of dice can take a long time to calculate for theoretical plots.

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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.

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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.