App Overview

K4 Control for Elecraft K4 icon

K4 Control for Elecraft K4

Marcus Roskosch · Utilities

K4 Control for Elecraft K4 is an innovative Software Defined Radio (SDR) client designed specifically for iPad users, allowing comprehensive control and operation of the Elecraft K4 transceiver

$89.99 · In-app purchases

PRICE
$89.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
4 ratings · Top 5%

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

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What's included19 files

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 K4 Control for Elecraft K4: map the core Utilities 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

Offer customizable settings and features for expert users.

Assumption to check: Limited functionality for advanced users

Validate with people who use this workflow before building.

Hypothesis 2

Introduce a tiered subscription model for different user needs.

Assumption to check: High price point for casual users

Validate with people who use this workflow before building.

Hypothesis 3

Implement better connection management and troubleshooting guides.

Assumption to check: Connectivity issues reported

Validate with people who use this workflow before building.

Hypothesis 4

Enhance help section with tutorials and a contact form.

Assumption to check: Lack of user support 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

K4 Control for Elecraft K4 is an innovative Software Defined Radio (SDR) client designed specifically for iPad users, allowing comprehensive control and operation of the Elecraft K4 transceiver. Developed to maximize the capabilities of the K4, this app is your gateway to operating your transceiver seamlessly, both locally and remotely via the internet. KEY FEATURES ■ Full Control Anywhere: Operate your K4 transceiver locally at home or from anywhere in the world with an internet connection. ■ Integrated Digital Modes: Use built-in tools for FT8, FT4, CW, Weather FAX and SSTV (NEW!) without the need for external software. ■ Logging: Maintain a comprehensive logbook with automatic logging, ADIF import/export. ■ Dual VFO and Waterfalls: Manage dual VFO settings and view real-time dual waterfall displays for detailed frequency insights (dependent on transceiver capabilities). ■ DX-Cluster and Alerts: Stay updated with DX-Cluster integration and personalized alerts for desired callsigns, DXCCs, States or others. ■ Visual and Interactive Features: View radio spots in the waterfall display, check band limits, and see callsigns on a map complete with directional data. ■ CW Operation: Offers unique CW capabilities including remote CW transmission via keyboard or a hardware paddle connected via CTR2/MIDI Controller. WHAT YOU NEED: - An Elecraft K4 Transceiver - The Transceiver needs to be connected to your local Network - No USB cable needed or supported - An iPad which runs at least iOS 18 LEARN MORE: Discover all features here: https://ham-radio-apps.com Access the full Manual: https://ham-radio-apps.com/manuals Note: K4-Control for Elecraft is independently developed and is not affiliated with or endorsed by Elecraft.

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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
Zustand
Axios
React Navigation
Firebase
BUILD KIT DIFFICULTY
Advanced

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.