App Overview

Fretsmith icon

Fretsmith

Matthew Read · Reference

FRETSMITH — THE LUTHIER'S BENCH REFERENCE

$9.99

PRICE
$9.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

Screen plan

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.

Differentiate and validate

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Fretsmith: 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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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

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

Include an extensive library of chords and variations.

Assumption to check: Limited variety of chords may not satisfy advanced players

Validate with people who use this workflow before building.

Hypothesis 2

Introduce interactive lessons or quizzes.

Assumption to check: No interactive features for learning

Validate with people who use this workflow before building.

Hypothesis 3

Implement regular updates with new content.

Assumption to check: Static content may become stale

Validate with people who use this workflow before building.

Hypothesis 4

Add community features like forums or user-generated content.

Assumption to check: Lack of user engagement options

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

FRETSMITH — THE LUTHIER'S BENCH REFERENCE Built by a working luthier who got tired of guessing. 623 guitar and bass models across 47 brands. Every spec verified against manufacturer documentation, model by model. Where a maker doesn't publish a number, Fretsmith says so instead of making one up. One-time purchase — less than a set of strings. No subscription, no account, no ads. It works offline, in a shop with concrete walls and no signal. WHAT'S INSIDE • Brand Specs — 47 brands, 623 models. Scale lengths, nut widths, fretboard radii, truss-rod tools and access points, saddle-slot dimensions, nut materials, and the model-specific traps that cost you an afternoon. Vintage models included. • Setup Checklists — 12 job-aware checklists in working order: electric, acoustic, bass and classical, plus fret levels, refrets, nut jobs, Floyd Rose and neck resets. • String Tension Calculator — exact plain-steel math and published unit-weight data for wound strings, including phosphor bronze. Any gauge, any tuning, any scale. Balance a set and size total neck pull before you buy the strings. • Nut Slot & Intonation Calculators — file-target slot depth, and the exact saddle-compensation direction and distance. • Measured-Spec Comparison — enter your measured relief, action and nut-slot depths. Each is flagged against the model's published spec and the typical working range, so you know what's off before you pick up a tool. • Acoustic Diagnosis — identifies a neck reset before you file the saddle away chasing it. • Diagnostics — tuning-stability and buzz decision trees, plus a truss-rod quick lookup with direction and tool by brand. • Reference — magnet types and pickup heights, 32 tonewoods with tone tags and CITES status, nut and saddle materials, and an action/relief/nut table across 16 instrument types. • Chromatic Tuner — a native pitch-detection engine with an A=440 reference tone. No clip-on, no second app. • Printable Spec Sheets — hand the customer a professional record of the work and the measurements. FOR PROFESSIONALS Fretsmith is a reference tool for trained luthiers and technicians. The procedures it documents can permanently damage an instrument if performed incorrectly. Always verify on the actual instrument; when in doubt, consult a qualified professional.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
React Navigation
react-native-sound
Axios
Redux
BUILD KIT DIFFICULTY

Not assessed in a Build Kit yet.

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.