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.
The Blues Licks app from JustinGuitar.com brings together over a year's worth of content from Justin's weekly Blues Licks series into a single, easy to use app
$2.99 · 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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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 Blues Licks: 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 free content leads to frustration for new users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Navigation can be confusing with multiple layers
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features to share licks
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access to licks
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.
The Blues Licks app from JustinGuitar.com brings together over a year's worth of content from Justin's weekly Blues Licks series into a single, easy to use app. Playing blues is a LOT about learning licks and how to use them, so as a blues guitarist you need to be constantly on the look out for new material. This app contains fifty six of the finest blues licks showcasing the styles of famous blues players like B.B.King, Eric Clapton, Stevie Ray Vaughan and more. Justin breaks down each lick in detail in a high quality video describing not only how to play it but also when to use it most effectively. Each lick video includes a performance by Justin at normal and slow speed, followed by a detailed note by note explanation of the notes and techniques used. The final section of each video includes tips from Justin on how the licks work musically and the concepts behind them. There is music score and TAB for each lick which follows along as the lick is performed. An animated fretboard is also available that clearly shows fingering on a virtual fretboard in real time as Justin performs the lick on video (for both left or right handed players). You can also loop the video playback using the app's controls to target a specific part of the lick when practicing. Learning to play blues is one of the most fun things you can do on guitar and it's a solid foundation for other styles too. The Blues Licks app from JustinGuitar.com is the perfect way to further your blues education with one of the most popular guitar teachers on the planet! The Blues Licks app includes: - 56 blues licks in the styles of the most famous blues players - High quality video for each lick including performance and detailed explanation of the notes and techniques - Follow along TAB and fretboard diagrams - Loop controls to target specific parts of the lick during practice - Links to the popular JustinGuitar.com Blues Lead Guitar course at JustinGuitar.com JustinGuitar.com is one of the most popular sites on the web for learning guitar with over 1,000 free guitar lessons. Created and run by Justin Sandercoe the site attracts more than 30,000 unique visitors a day and Justin's lesson videos have received over 266 million views on YouTube (as of July 2016). The lessons on the site are free and there are plans for thousands more, all supported by voluntary donations from students. For more information visit www.JustinGuitar.com
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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.