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
Wavelength
Hot or cold
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
59,902 ratings · Top 5%
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 Wavelength: map the core Games 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 a robust friend discovery feature with invitations.
Assumption to check: Difficulty in finding friends to play with
Validate with people who use this workflow before building.
Hypothesis 2
Add more diverse game modes to enhance replay value.
Assumption to check: Limited game modes
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free premium experience for a smoother play.
Assumption to check: Ads can disrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 4
Create a guided tutorial for first-time players.
Assumption to check: Onboarding can be confusing for new 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
Hot or cold. Soft or hard. Wizard or…not a wizard? Work together to decide where your clue falls on the spectrum – and win by reading your friends’ minds. Free to play, no ads, 2 to 10+ players, in the same room or across the world. “One of the best party games we’ve ever played” -Polygon “The best party game since Codenames” -Dicebreaker Apple Editors’ Choice & Game of the Day An evolution of the hit boardgame — with real-time dial movements, emoji reactions, and hundreds of new spectrums made just for the app. PLAY TOGETHER, ANYWHERE Wavelength can be played with 2-10+ players and can be played remotely or in person. CROSS-PLATFORM Available on most mobile devices so everyone can play together. ALWAYS FRESH A huge library of unique prompts, including 390 that you won't find in the physical box, plus occasional new themed packs. NO ADS, EVER Just the game. Play as much as you want, free. 100% COOPERATIVE Work together with your friends, react in real-time with synchronous dial movements, and express yourself with emoji reactions. FIND YOUR LEWK We created beautiful and customizable avatars with over FOUR MILLION unique combinations to find your best you. EARN ACHIEVEMENTS As a team you work together to try to beat your high score, and individuals can be rewarded with personalized achievements. Have questions or feedback? Talk to us! https://www.wavelength.zone/contact
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
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React Native Gesture Handler
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.
