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.
Featured in the Wall Street Journal as one of "The Best Apps for Learning to Play Music" and as the Apple App of the Week, Songsterr gives you free instant access to over a million high quality guitar, bass and drum t...
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.
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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 Songsterr Tabs & Chords: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Featured in the Wall Street Journal as one of "The Best Apps for Learning to Play Music" and as the Apple App of the Week, Songsterr gives you free instant access to over a million high quality guitar, bass and drum tabs & chords with FREE realistic playback. Songsterr Tabs & Chords is a subscription based app. The free version allows you to view and playback all the tabs. To get unlimited access to all the learning features like Speed Control, Loop, Solo, Mute, Pitch Shifting, etc., sign up for a $9.99 USD per month subscription (pricing may vary in countries other than the U.S.). This subscription gives you access on all supported platforms. FEATURES Tabs & Chords • Huge catalogue of over a million accurate tabs & chords with free full length playback. • High transcription quality. There is only one accurate version of a tab per song. • Legality. Music creators get paid. Tab Player • Realistic Guitar Engine. Learn and play along with Songsterr. • Original Audio. Play along with synchronized original audio. • Backing Tracks. Play along with synchronized original recordings of the rest of the band (with your part muted) for our most popular songs. • Multiple Instruments. Most songs have tabs for individual instruments (guitar, bass, drums, vocal, etc). • Mixer. Blend and adjust the volume of individual instruments to create your own custom mix. • Speed Control. Slow down tab playback up to 15% to learn difficult parts. • Loop. Play back selected measures over and over again. • Offline Mode. View and playback previously opened tabs offline. Cache size can be controlled via Settings app. • Solo. Hear only the instrument you are learning. • Mute. Play along with a backing track. • Pitch Shifting. Change the pitch of your tab and skip retuning your guitar. • Count In. Gives you time to prepare for playing after tapping Play. • Chromatic Tuner. Tune your guitar via mic or adaptors like iRig. • Background Audio Support. Play along using e.g. iRig and Amplitube (make sure that the "Background Audio" option is enabled in Amplitube) Navigation • Instrument Filter. Filter out songs that don't have a tab for your instrument. • History. Instantly access tabs you viewed recently. • Favorites. Quickly access your favorite tabs. • Favorites Syncing. Sign in with your Songsterr account to synchronize favorites with our website. Price • Pass-through Plus Subscription gives access on all supported platforms including Web. Your Songsterr subscription will automatically renew each month and your credit card will be charged through your Apple ID account. You can turn off auto-renew at any time from your Apple ID account settings. SUBSCRIBERS' AUTOMATIC-RENEWAL FEATURE: Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your iTunes account will automatically be charged at the same price for renewal within 24-hours prior to the end of the current monthly period, unless you change your subscription preferences in your account settings. You can manage your subscriptions through your Account Settings after purchase. No cancellation of the current subscription is allowed during the active subscription period. Please go to https://www.songsterr.com/privacy and https://www.songsterr.com/terms for more information.
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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 access for free users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Ads disrupt user experience
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some tabs/chords may be inaccurate
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited social sharing features
Validate with people who use this workflow before building.
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.