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
nPOP
"npop" is an iphone app developed to display those mails currently in the mail server(pop3).
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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/
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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.
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 nPOP: map the core Business 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
Include customizable categories and tags for better organization.
Assumption to check: Limited features for task categorization
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner layout with better spacing and grouping.
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 3
Add customizable reminders and push notifications for tasks.
Assumption to check: Lack of reminders and notifications
Validate with people who use this workflow before building.
Hypothesis 4
Clarify the benefits of in-app purchases and simplify the purchase process.
Assumption to check: In-app purchase confusion
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
"npop" is an iphone app developed to display those mails currently in the mail server(pop3). function of "npop" is simple. it constantly synchronizes with the mail server to maintain the list of [existing] mails. thus, once a mail is deleted from the mail server, it will also be deleted from the list of mails in "npop". "npop" is for those who do not want to manage mails on an iphone. [functions] - manage multiple accounts. - receive mails (pop3 only). - delete selected mails from the mail server. - display list of mails. - display mail contents. - display attached file (images, html, pdf, etc). - search mail. - sort list of mails. - set read or unread collectively. - set maximum number of mails to receive or lines to receive per mail. - login using ssl or apop. - send mail. [how to set up] gmail - host name: pop.gmail.com - port number: 995 - apop: off - ssl: on - ssl type: auto hotmail - host name: pop3.live.com - port number: 995 - apop: off - ssl: on - ssl type: auto
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.
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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.
