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
Pump Log® - Track Breast Milk
Pump Log® is built for exclusive pumping
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
5,850 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.
First kit free with a verified email
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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 Pump Log® - Track Breast Milk: map the core Medical workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Pump Log® is built for exclusive pumping This is NOT the all-in-one baby tracker with 20 features you don't use. Pump Log is the most trusted app for exclusive pumping. Track every session, manage your milk stash, and stay on schedule, all in one place. Exclusively pumping is hard. Pump Log makes it manageable. With a built-in timer, smart reminders, and detailed stats, you'll always know where you stand and what to do next. KEY FEATURES - Countdown Calculator Set your feeding goal and see exactly how many more days you need to pump. The most motivating feature in your exclusive pumping toolkit. - In-Depth Stats & Trends Track your breast milk output over time. Spot what's helping your supply, catch dips early, and pump with confidence. - Apple Watch App Log sessions and check your next pumping reminder right from your wrist. Perfect when your hands are full (are they ever not anymore??). - Reminders, Timer & Widgets Custom pumping reminders, a built-in session timer, and Home Screen + Lock Screen widgets keep you on track 24/7. - Detailed Session Logging Track time, volume, side, and notes. Everything you need to understand and grow your milk supply. - Stash Monitoring Build your freezer stash with confidence. Know exactly what you have banked and how long it'll last. Pump Log has helped tens of thousands of exclusive pumpers reach their goals — backed by 5,000+ five-star reviews from real EP moms. Download free and start your first session today!
Written user reviews are not shown here. Check current App Store reviews >
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 more customizable charts for user insights.
Assumption to check: Limited data visualization options
Validate with people who use this workflow before building.
Hypothesis 2
Add customizable reminders for different schedules.
Assumption to check: Inconsistent reminders
Validate with people who use this workflow before building.
Hypothesis 3
Enable multiple user accounts for families.
Assumption to check: No support for multiple users
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to export data for personal records.
Assumption to check: Lack of data export options
Validate with people who use this workflow before building.
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
Victory Native
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.
