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
Portell
Portell is a daily journal, beautifully simple: one entry per day, up to 100 characters — about one sentence
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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 Portell: map the core Lifestyle 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 a wider range of activities and customizable options.
Assumption to check: Limited variety of activities may not engage users.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear descriptions and benefits of premium features.
Assumption to check: In-app purchases may confuse users without clear value.
Validate with people who use this workflow before building.
Hypothesis 3
Create an interactive onboarding experience to demonstrate app features.
Assumption to check: User onboarding process may not be engaging.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate sharing options to allow users to share activities with friends.
Assumption to check: Lack of social sharing features may limit user engagement.
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
Portell is a daily journal, beautifully simple: one entry per day, up to 100 characters — about one sentence. That's the whole idea. No pages to fill. No blank-page guilt. One honest line before the day ends. WRITE • One line a day, 100 characters — focused writing, done in a moment • Attach photos to remember a day by • Edit today's line until the day ends; past days stay exactly as you wrote them REMEMBER • Streaks: current, best, and all-time • "On this day" brings back what you wrote in years past • Search every line, or browse by month KEEP • A daily reminder, set to the time you choose • Lock your journal with Face ID • iCloud keeps it backed up — and in sync with Portell on Mac, sold separately • A Home and Lock Screen widget shows your streak • Export to a real spreadsheet (.xlsx) or a PDF, photos inline Private by design: no accounts, no tracking, no data collected. Your journal lives on your iPhone and in your own private iCloud — never on our servers. One line a day. That's the whole practice.
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
@react-native-async-storage/async-storage
axios
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.
