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
Free Tone - Calling & Texting
UNLIMITED TEXTING AND CALLING WITH YOUR OWN PERSONAL PHONE NUMBER
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
62,760 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 Free Tone - Calling & Texting: map the core Social Networking 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
Implement better audio compression and error handling.
Assumption to check: Poor call quality in low bandwidth situations
Validate with people who use this workflow before building.
Hypothesis 2
Expand calling options to include more countries.
Assumption to check: Limited international calling options
Validate with people who use this workflow before building.
Hypothesis 3
Ensure real-time messaging updates with WebSocket integration.
Assumption to check: Inconsistent messaging notifications
Validate with people who use this workflow before building.
Hypothesis 4
Streamline account recovery process with better UX and support.
Assumption to check: Difficulties with user account recovery
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
UNLIMITED TEXTING AND CALLING WITH YOUR OWN PERSONAL PHONE NUMBER FREE TONE THE MOST POPULAR FREE CALLING APP ON THE STORE IS NOW AVAILABLE WITHOUT ADS FOR 1 WEEK With this version of Free Tone you will enjoy one week without ads when you create a new account* • Unlimited TEXT and PICTURE messaging to any phone in US & CANADA* • Unlimited Calling to ANY NUMBER IN THE US & CANADA* • Get a REAL phone number* • Receive phone calls on your number and enjoy Free Voicemail • Enjoy group texting features with text, photos and videos • Share your location in one click • Enjoy a wide sample of Stickers • Transform your IPAD into a real wifi phone No Catch, No Hidden cost! Free Tone is an easy to use messaging application that allows you to send unlimited text, voice, pics, video messages to any mobile phone number in United States and Canada. You can also Call any number in the US and Canada too ! Also, if your friends install the app as well, you will be able to do a lot more with them! So pick a Number and share it with your friends and start texting, calling! * Important: - For outbound calls to the US and Canada, calling is free with FreeTone - Hawaii, Alaska and some other territories are not supported in the free bundle - For inbound calls to your personal number, the first five hundred minutes are complimentary, with the ability to receive calls to your FreeTone number for a minimal extension fee - Free calls to numbers in the US & Canada from some locations are subject to some limitations - Access to the free US/Canada number and calling is limited to US and Canada residents - If Push notification is not enabled, you may not receive messages and calls - Only one free phone number per account - Removal of Ads for one week is only available to users having downloaded the paid version of Free Tone and creating a new account, for users updating the app or using their existing account you will keep experiencing your current Free Tone experience - After the week of usage without Ads you will start to see ads in the App Help us improve FreeTone: http://support.free-tone.com In-App Subscription Details: - Payment will be charged to your iTunes account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of your current period - Account will be charged for renewal within 24-hours prior to the end of the current period, at the purchase price listed in the "Manage Subscriptions" section of your iTunes account - You may manage your subscriptions and turn off auto-renewal by going to your iTunes Account Settings and then “Manage Subscriptions” - No cancellation of the current subscription is allowed during active subscription - Also see Terms & Conditions (http://go-text.me/assets/tc) and Privacy Policy (http://go-text.me/assets/pp) Terms of Use: https://api.textme-app.com/api/support/terms-conditions/ios/
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.
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BUILD KIT DIFFICULTY
Expert
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.
