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.
Explore the outdoors the way you want, all while staying safe with OS Maps
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for OS Maps: Walk, Hike, Run, Bike: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited offline functionality for maps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of integration with fitness tracking
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Explore the outdoors the way you want, all while staying safe with OS Maps. Whether you want to hike, bike or run, OS Maps will guide you through amazing trails across the USA. Want to find new places in your local neighborhood? Or plan that next thru-hiking adventure? From breathtaking National Parks to easy walks along the coast, experience the thrill of finding a brand new trail that you never even knew existed with OS Maps. Why you’ll love using OS Maps: EXPLORE NEW PLACES, CREATE NEW ADVENTURES Plan unlimited trails with detailed, up to date maps across the country & discover that next great trail! Whether you love to hike, bike or run, there are multiple map layers to suit any place, any activity. TRAILS AT YOUR FINGERTIPS Search for the best trails in an area as rated by fellow outdoor enthusiasts or plot your own trail to follow, share & record. Use OS Maps as your go-to trail finder, fitness tracker & outdoor guide. VIEW & DOWNLOAD MAPS OFFLINE No cell reception? No problem. Download your favorite areas to save & view offline, so you can view your maps & chosen routes even without cell reception. Plus, you can export your favorite trails & routes to your GPX device. TRAIL MAPS TO SUIT ANY ACTIVITY Choose from multiple map layers, plan activities & find trails with detailed topographic mapping; or explore the landscape in stunning detail with aerial view. You can even see the world in 3D with 3D map layers. RECORD, REVIEW & RELIVE ACTIVITIES Use the activity tracking feature & activity history dashboard to track each & every adventure. Look back on past activities & review your stats. STAY SAFE ON THE TRAIL Stay the course with live GPS location tracking & never miss a turn with off-course alerts to keep you on track. Download trails, routes & maps & share with others, whether they’re joining you or want to make sure you stay safe. STAY INFORMED WITH COMMUNITY ALERTS Get real-time updates from other OS Maps users with Community Alerts. Whether it’s a trail closure or tricky terrain; you’ll stay in the know thanks to insights from the outdoor community. It’s like having thousands of trail buddies helping you plan smarter and stay safer. USE ON EVERY DEVICE Go from laptop to hilltop with ease! View, create & sync your routes & activities with a single account across multiple devices. Plan on desktop, follow & record your activities on mobile and Apple Watch. PLANNING MADE EASY Use OS Maps as your off-road GPS tracker with automatic ‘snap-to-path’ making route planning easy with the shortest distance between your waypoints plotted automatically. UNLIMITED PRINTING Print copies of trails & maps to take with you so you always have a backup to hand. USEFUL INFO $4.99 for monthly subscriptions & $28.99 for annual subscriptions. Battery life can be dramatically decreased by using GPS constantly. We release updates to all of our apps as we improve them, making them even more stable & adding extra features. Along the way, your feedback & comments about those apps are really important to us. If there’s an issue or something you’d like us to know, head to https://www.ordnancesurvey.co.uk/contact-us OS Maps offers either auto-renewing monthly or annual subscriptions to provide you with premium access to OS Maps while you maintain an active subscription. If you choose to purchase a premium subscription, your payment will be processed by Apple. Subscriptions may be managed through the App Store App after purchase. Subscriptions on the App Store are renewed automatically unless you unsubscribe at least 24-hours before the end of the current period. Your Apple account will be charged for renewal no more than 24 hours before the end of the current period. You may cancel a subscription at any time before the end of the applicable billing period by going to your Subscriptions list within iOS settings. Terms & conditions: http://os.uk/termsosmaps Privacy policy: http://os.uk/privacy
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.