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
FastConvert: All File Tool
File Converter is a professional file and media format conversion tool that supports multiple functions including file conversion, video conversion, audio conversion, and image conversion.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.7
71 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 FastConvert: All File Tool: 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
Expand the range of supported file formats.
Assumption to check: Limited file format support compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Optimize conversion algorithms for better performance.
Assumption to check: Slow conversion speeds for larger files
Validate with people who use this workflow before building.
Hypothesis 3
Introduce user-defined presets for conversions.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Add support for cloud services like Google Drive or Dropbox.
Assumption to check: Missing cloud integration for file access
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
File Converter is a professional file and media format conversion tool that supports multiple functions including file conversion, video conversion, audio conversion, and image conversion. It allows for easy conversion between various formats with simple operations, and also provides practical tools such as file compression, merging, cropping, and speed adjustment to help you quickly process various files and media content. Whether it's file processing for work or study, or video, audio, and image editing for daily life, it can handle it all with ease. Core Functions: File Format Conversion: Supports conversion between multiple file formats, making file use across different devices and platforms more convenient. Video Format Conversion: Supports conversion between multiple video formats, and also provides video cropping and video speed adjustment functions. Audio Format Conversion: Easily convert audio formats and supports adjusting audio playback speed. Image Format Conversion: Supports conversion between common image formats, maintaining high-definition image quality. Practical Tools: File Compression: Quickly reduce file size File Merging and Stitching: Integrate multiple files Video Cropping: Easily trim video clips Video Speed Adjustment: Freely control playback speed Batch Processing: Improve work efficiency Simple and intuitive interface, easy operation, one-click conversion. Suitable for office work, study, content creation, and daily document processing. -Payment will be charged to iTunes Account at confirmation of purchase. -Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. -Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. -Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. Privacy Policy: http://saxdev.com/file/privacy.html Terms of User:http://saxdev.com/file/terms.html If you have any questions, feel free to contact us at [email protected]
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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
expo-file-system
json-server
expo-sharing
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.
