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
Principal®
Keep up with your financial goals on the go.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
221,522 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 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 Principal®: map the core Finance 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
Optimize data fetching with caching.
Assumption to check: The app can be slow to load data, especially on the dashboard.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create custom categories.
Assumption to check: Limited customization for budget categories.
Validate with people who use this workflow before building.
Hypothesis 3
Provide advanced analytics features for spending trends.
Assumption to check: Lack of detailed analytics and insights.
Validate with people who use this workflow before building.
Hypothesis 4
Streamline the bank linking process with better guidance.
Assumption to check: Difficulties in linking bank accounts.
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
Keep up with your financial goals on the go. The updated Principal® app makes it easy to keep on top of your retirement savings and gain insights to help you reach your financial goals. Download and use the app to: • Complete simple transactions and quick check-ins: view account balances, roll over funds, change contributions, adjust investments, and more • Discover financial education to help build your confidence and make progress in budgeting, saving, debt payoff, and more • Learn from tools like our personalized Retirement Wellness Score to see how you’re tracking toward your retirement goals • Find your insurance information The availability of information and functionality will vary depending on your plan type(s). To make changes not available on the app, visit principal.com. Some screens may contain more information than is illustrated in the samples. This document is intended to be educational in nature and is not intended to be taken as a recommendation. Insurance products and plan administrative services provided through Principal Life Insurance Co., a member of the Principal Financial Group®, Des Moines, IA 50392. Visit our online privacy policy at https://www.principal.com/privacy-policies © 2025 Principal Financial Services, Inc. 3729939-072024
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
Redux Toolkit
axios
react-navigation
react-native-chart-kit
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.
