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.
Change the BPM of your music! Perfect for Runners, Cyclists, DJs, Music Instructors and Dance Instructors or anyone who wants to move to their own beat.
$5.99 · 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 Tempo Magic: map the core Music 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 tempo and pitch adjustment range
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface is not visually appealing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Crashes during audio playback
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase process is confusing
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.
Change the BPM of your music! Perfect for Runners, Cyclists, DJs, Music Instructors and Dance Instructors or anyone who wants to move to their own beat. Accolades: • Featured by Apple as a Fitness Essential • Featured by Weight Watchers • Featured as a Top Shape-Up App by Health Magazine • Featured by Self Magazine • Featured as one of Eight Great Diet and Fitness Apps by CNN.com • Featured by IDEA as an essential app for Group Fitness Instructors The best fitness app just got even better. Tempo Magic lets you speed up or slow down the BPM (Beats Per Minute) of any song on your iPod without messing with the pitch. We won't ruin your favorite songs with high-pitched chipmunk lyrics or slowed down zombie vocals. Tempo Magic adjusts the music straight from your iPod app - no lengthy uploads or importing required. Just pick your playlist and go. Continuous play? No problem. Tempo Magic Pro features Gapless Playback for gapless albums and playlists so the beat never stops. Skip to any point in your playlist without stopping the music. Conceived and co-created by international fitness industry leader Petra Kolber and Yes! Fitness Music, the fastest growing fitness music company in the world. Features: • Change the BPM without touching the pitch • Plays all unprotected audiofiles straight from your iPod Library • Change tempo at any time • BPM Lock Mode allows you to take a playlist with multiple tempos and play it at the BPM of your choice! • Gapless Playback • Hifi Mode for slowing or speeding up by 50% • BPM Tapper to fine tune the analyzed BPMs of your tracks • Jump to any point in the track • Jump to any track in your playlist • Shuffle mode • Supports multitasking: Plays perfectly in the background • Compatible with Nike+ and Bluetooth Audio • Yes! Fitness Music Cloud Account Sync TURN ANY WORKOUT INTO THE PERFECT WORKOUT The key to the perfect workout is the perfect music. The right song with a high-energy beat can turn a grueling workout into a great one. But you don't just want any fast music, you want your favorite music. With just a slide of your finger, you can change the BPM (Beats Per Minute) of your favorite songs to perfectly match your feet on the road, your pedal stroke on your bike, the movements of your Group X Class, or anything else you can think of. KEEP THE PARTY HOPPING With BPM Lock Mode, you can make sure your party playlist never runs out of energy. Sprinkle on a little Tempo Magic, and you won't need to worry about a slower song clearing out the dance floor. ENJOY YOUR MUSIC, YOUR WAY Whether you want to match the music to your mood, or just play around with your favorite songs, Tempo Magic gives you control. Change the BPM of any song on your iPod with just a slide of your finger. You can even throw it into Ultra Shift if you really want to have some fun. System Requirements: Works with iPhone 3GS, 4, 4S, and 5, and iPad 2 or greater. We support iOS version 5.0 or better
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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.