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.
Echovo - Best TTS & Voice Cloning
$4.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Echovo - TTS & Voice Cloning: 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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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
Assumption to check: Limited voice options for TTS.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High subscription cost for advanced features.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent recording quality.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline functionality.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Echovo - Best TTS & Voice Cloning Echovo brings state-of-the-art text-to-speech right to your iPhone, powered by Qwen3-TTS running entirely on-device with Apple silicon acceleration. Your text never leaves your phone. ## Two Powerful Modes - **Text-to-Speech**: Type or paste any text and generate natural, expressive speech. Choose from multiple speakers, adjust quality settings, and control the speaking style with custom instructions. - **Voice Clone**: Record a short audio clip or upload a reference file, and Echovo will generate speech that matches the voice characteristics. Clone any voice in seconds. ## 11 Languages Supported Generate speech in English, Chinese, Japanese, Korean, German, French, Spanish, Russian, Portuguese, Italian — or let auto-detection handle it for you. ## Completely Private All processing happens on your device using Apple's MLX framework. No audio data, no text, and no voice samples are ever sent to external servers. Your conversations stay yours. ## Key Features - On-device AI inference — no internet required after model download - Two model variants: Base (TTS + voice cloning) and CustomVoice (instruction-based style control) - Real-time performance metrics: RTF, synthesis time, memory usage, token count, and thermal state - Adjustable quality presets: Fast, Balanced, and High - Generation history with built-in audio playback - Record reference audio directly or import from files - Save and manage reference audio library for quick reuse - Dark and Light theme with elegant, minimal interface - Share generated audio files ## How It Works 1. Download a model (~1.9 GB each, one-time) 2. Type your text and tap Generate 3. Listen, share, or save the result ## Requirements - iPhone with Apple Silicon (A17 Pro or later recommended for best performance) - ~2 GB free storage per model Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.notion.so/Echovo-App-Page-2fef5511043f80e19a78e09f2d7c9ce3
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.