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
Text to Speech Pro
Bring your text to life with Text to Speech! Text to speech produces natural sounding synthesised text from the words that you have entered in
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
33 ratings · Top 50%
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 Text to Speech Pro: 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 more diverse and natural-sounding voice options.
Assumption to check: Limited voice options in text-to-speech apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement better performance and UI for long text processing.
Assumption to check: Poor handling of long texts
Validate with people who use this workflow before building.
Hypothesis 3
Provide better controls for playback speed and pausing.
Assumption to check: Inconsistent playback control features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize voice parameters like pitch and volume.
Assumption to check: Lack of customization for users
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
Bring your text to life with Text to Speech! Text to speech produces natural sounding synthesised text from the words that you have entered in. With 178 different voices to choose from and the ability to adjust the rate and pitch, there are countless ways in which the synthesised voice can be adjusted. Features ------------------------- - 178 Different voices to choose from - Voices are available in 63 different accents & languages - No internet required - The ability to adjust the pitch and rate - Speak as you type - Highlight spoken text - Star your favourite phrases - Group starred phrases into folders - Export speech into audio files - Mix speech into your phone calls - Supports personal voices (requires iOS 17) Voices ------------------------- Arabic (World) Basque (Spain) Bengali (India) Bhojpuri (India) Bulgarian (Bulgaria) Catalan (Spain) Chinese (China mainland) Chinese (Hong Kong) Chinese (Liaoning, Mainland China) Chinese (Shaanxi, Mainland China) Chinese (Sichuan, Mainland China) Chinese (Taiwan) Croatian (Croatia) Czech (Czechia) Danish (Denmark) Dutch (Belgium) Dutch (Netherlands) English (Australia) English (India) English (Ireland) English (Scotland, UK) English (South Africa) English (United Kingdom) English (United States) Finnish (Finland) French (Belgium) French (Canada) French (France) Galician (Spain) German (Germany) Greek (Greece) Hebrew (Israel) Hindi (India) Hungarian (Hungary) Indonesian (Indonesia) Italian (Italy) Japanese (Japan) Kannada (India) Korean (South Korea) Malay (Malaysia) Marathi (India) Norwegian Bokmål (Norway) Persian (Iran) Polish (Poland) Portuguese (Brazil) Portuguese (Portugal) Romanian (Romania) Russian (Russia) Shanghainese (China mainland) Slovak (Slovakia) Slovenian (Slovenia) Spanish (Argentina) Spanish (Chile) Spanish (Colombia) Spanish (Mexico) Spanish (Spain) Swedish (Sweden) Tamil (India) Telugu (India) Thai (Thailand) Turkish (Turkey) Ukrainian (Ukraine) Vietnamese (Vietnam) Notes ------------------------- - More voices are available in system settings Go Settings -> Accessibility -> Spoken Content -> Voices
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
Supabase
expo-speech
Zustand
BUILD KIT DIFFICULTY
Starter
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.
