App Overview

Roastmaster icon

Roastmaster

Rainfrog, Inc. · Food & Drink

ACHIEVE THE PERFECT CUP – CONSISTENTLY

$9.99 · In-app purchases

PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
22 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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Build Kit

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

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What's included18 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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Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Roastmaster: map the core Food & Drink 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 create custom profiles and share them.

Assumption to check: Limited coffee profiles and customization options

Validate with people who use this workflow before building.

Hypothesis 2

Integrate social sharing options for tasting notes.

Assumption to check: No social sharing features

Validate with people who use this workflow before building.

Hypothesis 3

Provide analytics on user roasting and tasting patterns.

Assumption to check: Lack of robust analytics for coffee trends

Validate with people who use this workflow before building.

Hypothesis 4

Implement a guided onboarding tutorial for first-time users.

Assumption to check: Difficult navigation for new users

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

ACHIEVE THE PERFECT CUP – CONSISTENTLY Creative coffee roasting is an art. The key lies in leveraging both your triumphs and mistakes, and visualizing how all of your data works together to affect the final taste. Designed for specialty and prosumer roasters alike, Roastmaster paints the bigger picture. It enhances and speeds your workflow, compounding your achievements on your way to that consistently perfect cup! ROAST Learn from the past and build a future: Set a roadmap from any profile or roast with just a tap Track any number of reading or control curves with various scales, like temperature, pressure or humidity Target, inspect, and monitor data in the interactive analyzer Stay on course with delta curves, level indicators, and temperature projections Never miss a milestone with alarms, set-point alerts, and temperature trigger notifications Save any roast as a profile, and build a custom library tailored to style or bean View interactive roast log reports to compare metrics like drying time, development percent, moisture loss, and many others Create roaster maintenance schedules to be reminded when individual tasks are due, and log details like service time and costs BEANS Keep your green bean inventory in sync with your actual stock — automatically: Beans or blends – let Roastmaster do the bean counting for you! Set order reminders to alert you of low inventory Record details like country, trade, processing, and more Track lot details such as age, cost, moisture, Q Score, and more Audit inventory and lot shipments with advanced reporting BLENDS Get creative concocting, tasting, and perfecting your signature blends: Blend green beans or roasts by weight or percentage Create "snapshot" experiments and track your results Roasting a blend? Let Roastmaster calculate the green weights CUPPINGS Rate a morning pot of drip coffee, or score a professional cupping session: Record extraction time, brew ratio, grind settings, and more Score traditional attributes like aroma, body, and acidity with multiple cupping styles Enter scores easily with interactive spider graphs Visualize how cupping scores relate to all aspects of your workflow LINK TO THERMOCOUPLES (OPTIONAL) The Data Logging in-app purchase allows you to connect one or more thermocouples to automate your roasts. Roastmaster displays and records real-time temperature readings from each probe. When paired with Roastmaster’s other automation features, roasting becomes truly hands-free! MUCH, MUCH MORE Reports, labels, sharing – if it’s aimed at great tasting coffee, you can bet it’s in there or we’re working on it! For a complete guide and walkthrough, please visit: http://rainfroginc.com

Written user reviews are not shown here. Check current App Store reviews >

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
TypeScript
Supabase
Zustand
React Navigation
BUILD KIT DIFFICULTY
Intermediate

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.