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.
Canter
$4.99 · 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.
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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 Canter: Run Walk Training: map the core Health & Fitness 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: Users struggle with data accuracy in tracking activities.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited social features for motivation and accountability.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalized workout recommendations.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase model may confuse users.
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.
Canter. Run-Walk Interval Timer Build endurance the way coaches recommend: alternate running and walking, with audible cues at every transition. Whether you're going from zero to your first 5K, training for a marathon, or coming back from injury, Canter keeps the rhythm so you can keep your phone in your pocket. THE ESSENTIALS - 6 time-based presets (20 sec to 5 min) and custom intervals from 10 seconds to 30 minutes - 6 distance presets, with custom values up to 5 km / 3 miles - Voice announcements ("Run!", "Walk!"), bell sounds, and haptic feedback - Works with the screen locked - Home Screen widget for one-tap starts, plus a Control Center button on iOS 18 or newer - Optional daily training reminder - Dark theme that's easy on outdoor eyes - Pay once, yours forever. No subscription, no account, no ads, no tracking ZERO TO 5K TRAINING PLANS - Two guided plans: the standard 10 weeks, or a gentler 13-week progression - Three sessions a week, each one scripted for you: warm-up, run/walk intervals, cool-down - A week-by-week ladder that tracks every completed session - The finale is a real 5K, measured by distance, not time - A short questionnaire helps you pick the plan that fits - Start sessions from iPhone or Apple Watch; progress stays in sync PAY ONCE. YOURS FOREVER. Most running apps charge $40 to $80 per year. Canter is a single purchase. Every feature included, forever. Less than one month of a typical subscription. METRIC OR IMPERIAL, YOUR CALL Pick the units you train in, or follow your iPhone's locale. Distances, pace, and milestones update automatically. - Metric: 100 m, 200 m, 400 m, 500 m, 800 m, 1 km - Imperial: 300 ft, 600 ft, 0.25 mi, 0.50 mi, 0.75 mi, 1 mile - Custom up to 5 km / 3 miles - Voice countdowns and bell + haptic at every interval boundary APPLE WATCH, STANDALONE Run from your wrist alone, no iPhone required. Same warm voice coaching as the iPhone app. Distinct haptics for run vs. walk transitions. Live heart rate display with the 5-zone system Apple Workout uses. Workouts count toward your Activity Rings automatically, and finished watch workouts sync to the iPhone app on their own. MILE MARKERS Cross a mile and know it: a voice cue for the distance and a card on screen with your split, plus a haptic tap on Apple Watch. Works on iPhone and Apple Watch, in miles or kilometers. GPS & ROUTE TRACKING - Live map shows your route as you run - Pace calculated from distance and time - "GPS signal lost" / "GPS signal found" voice cues at the Full voice coaching level, so you know your route is being tracked - Route maps saved with workout history STATISTICS & PROGRESS - Workout streaks - Weekly chart - All-time totals - Progress over time SIRI & SHORTCUTS - "Hey Siri, start a run walk workout with Canter" - Custom Shortcuts automations supported DESIGNED FOR RUNNERS Large, easy-to-read display. Works with screen locked. Dark theme reduces glare outdoors. Haptic feedback for silent alerts. No account required. No ads, no tracking.
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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.