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
brrrrr
Count anything
$7.99 · In-app purchases
PRICE
$7.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for brrrrr: map the core Productivity 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 a minimalistic design with clear categorization of tasks.
Assumption to check: Users often find task management apps cluttered and hard to navigate.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce natural language processing for quick task additions.
Assumption to check: Many apps lack quick entry options for tasks.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate a robust project management feature with task associations.
Assumption to check: Users desire better organization of tasks across projects.
Validate with people who use this workflow before building.
Hypothesis 4
Offer more customizable settings for notifications and themes.
Assumption to check: Limited customization in settings.
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
Count anything. Track everything. brrrrr is the friendly little app for life's small counts: cups of coffee, days since the gym, the next d20 roll, whose turn it is to do the dishes. Four trackers, infinite uses. TALLIES — One tap, one count. Press and hold to fly through hundreds. DICE — Roll d2 through d100. Perfect for game night, decision-making, or breaking a tie. LISTS — Shuffle for tonight's dinner. Advance through a chore rota. Pick a name out of the hat. DATE-SINCE — Days since you started, quit, ran, called. Watch the streak compound. SCHEDULES — Tallies and lists can advance, reset, or shuffle on their own, daily or weekly. Set it once and forget the upkeep. ICLOUD SYNC — Sync trackers and values across iPhone, iPad, and Apple Watch. WIDGETS & SHORTCUTS — Glance, tap, count from your Home Screen, Lock Screen, or Spotlight.
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
Supabase
Zustand
react-native-reanimated
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.
