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.
App Overview
Whisk
Whisk is a lightweight HTML and PHP editor with a live preview that updates as you type.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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 included16 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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Whisk: map the core Developer Tools 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
Focus on unique features like recipe sharing and community engagement.
Assumption to check: Limited features compared to more established developer tools.
Validate with people who use this workflow before building.
Hypothesis 2
Implement robust moderation and feedback mechanisms.
Assumption to check: Potential difficulties in managing user-generated content.
Validate with people who use this workflow before building.
Hypothesis 3
Create a simple onboarding flow with tooltips and guided tours.
Assumption to check: User onboarding can be overwhelming.
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
Whisk is a lightweight HTML and PHP editor with a live preview that updates as you type. *** Whisk’s free download includes 14-day fully functional trial and document viewer mode. An In-App Purchases is available to unlock the full edition, with discounts for previous owners. *** Whisk is an essential app in your toolkit for HTML, PHP, CSS, and Javascript programming. It is great for learning web development, testing snippets of code, or building entire web pages. Whisk’s integrated preview pane displays the web page live as you type. Whisk breaks the tedious cycle of writing HTML, saving the file, then reloading and viewing the page in the browser. Combining the writing phase with the viewing phase clarifies the effects of your changes and speeds up the overall process of making a web page. W3C-based validation will red-underline any mistakes. It uses the same rendering engine found in Safari, so it is not only standards compliant, but also very fast. =================== Whisk is the app previously known as HyperEdit! For a comprehensive list of what’s new, visit: https://tumult.com/whisk/whats-new/2.6/ Macworld rating (Nov 2004): 4.5 mice =================== Use Whisk For: • Crafting HTML to make sure it looks exactly as you want it • Testing and executing PHP code • Writing blog posts, forum entries, or rich emails • Interactively trying out CSS • Running and debugging JavaScript • And creating whole websites Main Features: • Preview pane quickly renders HTML and PHP as typed, using the same engine as Safari • Watched Files automatically (or manually) determine when files are changed and will reload the web preview (file access permissions required) • Live HTML W3C-based validation shows errors and highlights problem tags with a red underline • Preview to other browsers or the Hype Reflect app on iOS • Web inspector/console/dev tools access • Customizable syntax highlighting coloring • Reusable code snippets and color swatches • Scroll sync keeps can keep the editor and preview at similar spots • View HTML source code generated by the PHP engine • Attach Style Sheets for viewing how blog posts/markup will look with external styling Because We Love the Mac: • Written in Cocoa exclusively as a macOS app (supports 10.12 through macOS 14 Sonoma) • Adopts new macOS features and is gorgeous in Light and Dark modes • It runs natively as a Universal app on Intel and Apple Silicon Macs =================== Download Whisk now and start your free trial! Documentation is available on Whisk’s website.
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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.
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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.
