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.
App Overview
On The Grind Coffee
The long-awaited, highly requested On The Grind App is finally here! Enhance your OTG experience with contactless pay, integrated OTG Rewards, and more!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
18 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for On The Grind Coffee: 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
Expand shop partnerships for more local options.
Assumption to check: Limited coffee shop options in some areas
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time tracking and ETA updates.
Assumption to check: Inconsistent delivery times
Validate with people who use this workflow before building.
Hypothesis 3
Streamline payment methods and provide clearer instructions.
Assumption to check: Difficulties with payment processing
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a review system for better transparency.
Assumption to check: Lack of user reviews for shops
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 long-awaited, highly requested On The Grind App is finally here! Enhance your OTG experience with contactless pay, integrated OTG Rewards, and more! Pay Through the App: Charge Up your digital OTG Card to pay and earn points with a simple QR code scan at any location. OTG Points will automatically be added to your loyalty account to earn rewards with every purchase! OTG Rewards: Sign up from the App or swing by any location and we will be more than happy to get you signed up! It’s free and only takes a few seconds! Browse The Menu: Take a look at our existing drink and snack menu to find the perfect taste to fit your vibe! Stay in the Loop: Keep an eye out for specials, promos, and updates. Make sure to check back often so you don’t miss any of the action! Find a Location Near You: Whether you’re going to your favorite location, or you’re in a new area you can find the nearest On The Grind to you! Can’t remember what you ordered last time? No worries - the Last Visit tab will tell you exactly what you ordered last time, including any customizations and modifications for an easy re-order experience! Have a go to order or find a new favorite? With a simple heart on the drink you can favorite it for next time! Stylize Your App: Update your name and photo, customize your background, change your privacy settings, and more from the Profile Tab.
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
Zustand
React Navigation
Axios
Firebase
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.
