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
Change Video Speed for Safari
Easily control the playback speed of HTML5 videos and audio across websites in Safari
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 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 Change Video Speed for Safari: 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
Support additional formats and provide user feedback.
Assumption to check: Limited video format support
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to save presets for different videos.
Assumption to check: No ability to save multiple speed settings
Validate with people who use this workflow before building.
Hypothesis 3
Include onboarding and help sections.
Assumption to check: Lack of user support/tutorials
Validate with people who use this workflow before building.
Hypothesis 4
Enable speed adjustment across various platforms.
Assumption to check: No integration with other video apps
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
Easily control the playback speed of HTML5 videos and audio across websites in Safari. This Safari extension offers quick controls, rich customization options, and convenient keyboard shortcuts. Key Features: • Quick Popup Controls – Adjust speed instantly with a slider, plus +/- buttons and customizable preset buttons. • Precision Slider – Define your own minimum, maximum, and step values for fine-tuned control (0.1x–16x). • Initial Speed Options – Choose to automatically apply the last used speed, a custom default speed, or start at normal speed. • Keyboard Shortcuts (macOS only) – Assign custom keys to increase or decrease speed by a chosen amount, or jump directly to a specific speed. Both the speed values and key bindings are fully customizable. Limitations: • Works only with HTML5 media. • Some websites may block speed control or restrict playback speeds (e.g., limit to 2x). • Embedded videos may require opening the original source page. • Due to the wide variety of websites, compatibility with every site cannot be guaranteed. If needed, you can contact us to check whether this extension works on a specific site before installing. For feature requests, questions, or bug reports, please visit our support page: https://www.wide-apps.com
Written user reviews are not shown here. Check current App Store reviews >
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
Redux
React Native Reanimated
BUILD KIT DIFFICULTY
Intermediate
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.
