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.
IntervalPro+ --> Your Personal Interval Training Coach
$0.99 · 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 intervalProPlus: 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: Lack of user engagement due to limited workout options.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user retention due to lack of tracking and stats.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited social features for motivation.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inadequate onboarding experience for new 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.
IntervalPro+ --> Your Personal Interval Training Coach Whether you're doing HIIT, Tabata, circuit training, or any custom interval routine, IntervalPro+ keeps you in the zone with precision timing, motivating voice cues, and a beautifully designed interface built for real workouts. POWERFUL CUSTOMIZATION Set exactly how you train — configure work time, rest time, repetitions per round, number of rounds, and rest between rounds. Save your favourite setup as a Preferred Workout and launch it instantly from the home screen with one tap. AI VOICE COACH Never glance at your screen again. IntervalPro+ calls out every phase transition, counts down the final seconds, and keeps you moving with real-time audio cues — so you can stay focused on your form. SOUND EFFECTS & HAPTICS Crisp audio signals and tactile haptic feedback mark every interval boundary. Know exactly when to push and when to recover — even with your phone face-down. STUNNING VISUAL THEMES Eight bold gradient themes transform the look of your entire app in one tap. From Electric Blue to Volcanic Red, find the vibe that matches your intensity. WORKOUT HISTORY Every session is automatically logged. Browse your full history, load a past training and export to CSV with a single tap — perfect for sharing with a coach or tracking progress in a spreadsheet. KEEP LISTEN TO YOUR MUSIC Interval Pro+’s AI coach automatically lowers the volume without pausing your track, so every instruction stays clear and easy to hear. DESIGNED FOR FOCUS Clean, distraction-free timer view. Large, readable numbers. Everything you need, nothing you don't. — Custom work / rest / round intervals — 8 different AI voices coaching with phase announcements — Sound effects + haptic feedback — 8 gradient colour themes — Preferred Workout quick launcher — Full session history with CSV export — Fireworks celebration on completion — No account required. No ads. Ever.
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.