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.
Simple 12-string guitar tuner to tune up your 12-string guitar
$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.
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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 12-String Guitar Tuner Simple: 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 tuning modes for different instruments
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inaccurate pitch detection in noisy environments
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual feedback for tuning progress
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Basic user interface with minimal customization
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.
Simple 12-string guitar tuner to tune up your 12-string guitar. This is for the standard eEaAdDgGBBEE 12 String Guitar tuning. Tuning your guitar can be a difficult task for you if you are just beginning guitar. The good news is, the more you do it, the easier it becomes. A nicely tuned guitar can make your music sound a lot better and help you greatly while you're are just getting the hang of finger placement for notes. A 12 string guitar is split up into 6 pairs of 2 strings. The thicker string of the pair is tuned to the same note and octave as a regular 6 string guitar. The thinner string, on the pair of strings 3-6, is tuned one octave higher than it's pair. On the first and second pairs, the notes are the same octave and each string in the pair should sound exactly the same to it's other string in the pair. This is eEaAdDgGBBEE tuning. The lowercase letters means that it is one octave higher then it's counterpart. Touch the note for the string you want to tune and then turn the tuning pegs on your guitar and match it up with the note that is being played. Tip: Make several passes tuning each of the strings. For example you might have noticed that if you have tuned all the strings once, and then back to the first one you tuned, it might be off a little bit. This is because you are increasing or decreasing the tension on each of the strings as you tune it and the instrument's body might bend ever so slightly due to this difference in tension. This causes the other strings to slightly change in pitch. So make sure you keep on checking and tuning the strings until all are in tune, so make several passes. Also you can use this simple tuner for your standard 6-String Guitar, it is the same tuning, only the strings on the 6-String Guitar are EADGBBEE, which is right part of this 12-String Guitar Tuner. So use just right part of this tuner to tune up your 6-String Guitar. Any questions using the App? Write [email protected] and we we'll get back to you promptly. If you need to tune other music instruments simply have a look into our other applications: Violin Tuner Simple, Cello Tuner Simple, Banjo Tuner Simple, Mandolin Tuner Simple, Double Bass Tuner Simple, Viola Tuner Simple, Guitar Tuner Simple, Ukulele Tuner Simple, Bass Tuner Simple. Follow us on Twitter: @TuneInstrument Like us on Facebook: facebook.com/Tuneinstrument Follow us on Google+: Tuneinstrument Subscribe to YouTube channel: www.youtube.com/TuneInstrument Sign up for newsletter and or visit us: www.tuneinstrument.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.