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
Simply North
Simply North is a powerful compass with a gorgeous design that feels like a work of art.
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
50 ratings · Top 30%
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 included16 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 Simply North: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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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
Provide a clean and straightforward interface focused on essential features.
Assumption to check: Users find navigation apps cluttered and complicated.
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time traffic overlay for better route planning.
Assumption to check: Real-time traffic updates are often lacking.
Validate with people who use this workflow before building.
Hypothesis 3
Include an offline maps feature for areas with poor connectivity.
Assumption to check: Limited offline functionality.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance voice navigation with clearer TTS and lane guidance.
Assumption to check: Voice navigation can be unclear.
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
Simply North is a powerful compass with a gorgeous design that feels like a work of art. Besides pointing to the true or magnetic north, Simply North also displays your current location, altitude and speed. This makes it the perfect companion for passionate hikers! With the last update we have enriched the app with an elegant new flat look, which keeps the user interface absolutely clean and intuitive. We have worked so many nights to make it pixel perfect and we hope that you love the result! More features: - simple user interface - haptic feedback - no ads or banners - tap on the coordinates to copy location + course to clipboard - built with love, like the original Apple compass - a universal app for both iPad and iPhone - dark / light mode with 3 different skins - and last but not least: retina graphics for all devices! ATTENTION: Does not work on iPod touch What press is saying: "Simply North is an outstandingly simple app and is incredibly gorgeous to look at." [beautifulpixels] "Simply North is ideal for anyone who is frequently outdoors." [Appadvice] Thanks to Apple for creating the canvas for this little artwork. Like or Follow us: http://facebook.com/simplynorthapp http://twitter.com/busybytes http://youtube.com/busybytes Help and support: [email protected]
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
react-navigation
axios
react-native-maps
expo-location
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.
