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
NaturalReader - Text To Speech
Transform any text, PDF, document, cloud file, or webpage into high-quality audio with NaturalReader
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
8,962 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's included18 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 NaturalReader - Text To Speech: map the core Productivity 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 a wider variety of voices and accents.
Assumption to check: Limited voice options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a document import feature for easier text handling.
Assumption to check: Text input can be cumbersome for long passages
Validate with people who use this workflow before building.
Hypothesis 3
Standardize playback controls across all screens.
Assumption to check: Inconsistent playback controls
Validate with people who use this workflow before building.
Hypothesis 4
Provide more options for adjusting pitch and tone.
Assumption to check: Limited customization for speech settings
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
Transform any text, PDF, document, cloud file, or webpage into high-quality audio with NaturalReader. Trusted by over 1 million monthly users and backed by 15 years of AI technology experience, we are the ultimate tool for productivity and accessibility. GET STARTED INSTANTLY Start for Free: No account required to start listening. No Ads: Enjoy a completely ad-free experience so you can focus entirely on your content. EXPERIENCE NATURAL TEXT-TO-SPEECH Listen to Any Text: Seamlessly support for PDF, Cloud Files (Google Drive, Dropbox, OneDrive), MS Word (.doc & .docx), MS PowerPoint, Mac documents, RTF, TXT, DRM-free EPUB eBooks, and image files. OCR Camera Scanner: Snap a photo of a physical book, handout, or printed notes to convert them into spoken audio instantly. Download MP3: Save audio files in MP3 format for offline listening on any device. Cross-Platform Sync: Create a free account to sync your history across devices. Start listening on your mobile device and seamlessly switch to the NaturalReader Online Reader. NATURAL READING EXPERIENCE Customizable Tones & Delivery: Use a simple prompt to customize the tone and delivery of your narrator to perfectly match your content. 200+ High-Quality Voices: Access 200+ AI voices in 90+ languages. Find the perfect narrator for any type of document. Speaker Controls: Speed up playback (up to 5x) to save time, or slow down (0.5x) for deep comprehension. Adjust the number of speakers, pause duration, and sentence repetition, perfect for language learning. AI-POWERED PRODUCTIVITY AI Podcasts: Condense long readings into engaging AI Podcasts to consume content faster. AI Recap: Instantly generate concise summaries of your documents. Voice Cloning: Create a custom AI voice that sounds just like you. AI Quizzes: Study smarter by testing your knowledge with automatically generated quizzes. ACCESSIBILITY & READING TOOLS Dyslexia Friendly: Enhanced reading support with dyslexia-friendly fonts and customizable reading modes. Visual Aids: Follow along easily with synchronized word/sentence highlighting and closed captions. Annotations: Highlight important passages and add notes to organize key information effortlessly.
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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.
