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
Crumbl
Discover everything Crumbl all in one place with the Crumbl App! Need a sweet treat? Whether you prefer pickup, delivery, or catering, we’ve got you covered! Download now and start earning Crumbl Rewards!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
5,670,115 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Crumbl: 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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Continue in Rork >
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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
Offer customizable cookie options or rotating flavors.
Assumption to check: Limited cookie variety compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a subscription for free delivery.
Assumption to check: High delivery fees
Validate with people who use this workflow before building.
Hypothesis 3
Provide real-time order tracking with updates.
Assumption to check: Long wait times for orders
Validate with people who use this workflow before building.
Hypothesis 4
Include more payment methods like digital wallets.
Assumption to check: Limited payment options
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
Discover everything Crumbl all in one place with the Crumbl App! Need a sweet treat? Whether you prefer pickup, delivery, or catering, we’ve got you covered! Download now and start earning Crumbl Rewards! Collect Rewards Earn points with every order—pickup, delivery, or catering. The more treats you enjoy, the more Rewards you earn! Pickup Order from your phone and skip the line! Your desserts will be ready and waiting. Prefer curbside pickup? Stay comfortable in your car—we’ll bring them right to you. Delivery Order fresh, delicious desserts without ever leaving your couch. Perfect for a cozy night in—order from the app and we’ll deliver right to your door. Catering Planning an event? Make it unforgettable with Crumbl. Whether it’s a wedding, office party, graduation, or casual get-together, select your flavors and quantities, and we’ll take care of the rest. Flavors may vary by location. Gifting Delight friends and family with a box of delicious treats or a Crumbl Gift Card. Never Miss a Thing Stay in the loop with notifications on promos and weekly menu updates. You’ll always be the first to know what’s baking! Manage Your Account Easily update your account details, from preferred payment methods to delivery addresses—all in one convenient place. Download the Crumbl App today and make every moment a little sweeter!
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
Axios
React Navigation
Expo Location
BUILD KIT DIFFICULTY
Advanced
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.
