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.
Tired of all those chordfinder apps that just give you the standard results every app gives you? Fretter is the new kid on the block
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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 Fretter - Chordfinder: map the core Reference 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 chord selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No visual representation for finger placement
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of offline access
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social features to share chords
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.
Tired of all those chordfinder apps that just give you the standard results every app gives you? Fretter is the new kid on the block. And it's great. Ugly, but great! We didn't sit behind our computers typing in all those chord diagrams, no we spent our time better. We came up with a way to give you lots of great correct diagrams, without needing us to do boring stuff: Fretter teaches your iPhone basic musictheory and with that knowledge it has the power to give you every possible diagram there is. Want to see how to play Cmaj7/F# on a Guitar with a Dropped D tuning? Fretter knows how to search for it! (We didn't try, but if it's possible to play, it will definitely show up. Yes, we're lazy. :) ) Still, Fretter is great. And it does awesome stuff like reverse chord lookup (for the creative geniuses among you), and you can also strum the diagrams to hear how they sound. Easy if you want to find the perfect sounding Dmaj9 or whatever strange chord you need! So, what are you waiting for? Fretter! For a more formal description, please continue reading. Looking for ways to play all those chords on your guitar, banjo, ukulele or mandolin? Interested in a reverse lookup function? Fretter: the ultimate chordfinder! Fretter doesn't rely on a database with diagrams, instead it calculates all the possible diagrams for a given chord/instrument/tuning combination. It's algorithm is optimized to only present to you the chords that you can actually play as a human. Because Fretter is build this way, you can select any tuning and still have all the possible chords presented to you. You can easily select a basic or advanced chord, optionally with added bassnote, and go to the diagrams. Each diagram has extra information about the chordnotes and the intervals used. A very nice feature is the audio playback. You can hear how the chord variations sound so you can easily select which variant you like the most. Also included is a reverse lookup option. Nice if you are a bit adventurous and you are coming up with your own chords on your instrument, but don't know how they are called. Fretter can help you here by providing you with the correct naming. If you are looking for a chord reference app: this is what you need. "Where this app stands out though, is not in its vast reference of chords; it is in it’s reverse look up option." 4/5 stars on AppAdvice.com Feature list: * Support for Guitar, 4,5-string Banjo, Ukulele, Mandolin, Lute, Bouzouki, 4-string Bass, Pipa * 50+ chordtypes * Tunings: 75+ predefined and custom. * Added bassnote (C/D) * Audio Playback * Reverse lookup * Chord Intervals * Note Names Please contact us by email if you experience a bug!
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.