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
CalcKit: Tip, Convert & Utils
Have you ever had these awkward moments?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
85 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 CalcKit: Tip, Convert & Utils: 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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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
Allow users to customize settings for different currencies and tax rates.
Assumption to check: Limited customization options for calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to save and track past calculations.
Assumption to check: No history of previous calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify UI with a more streamlined design layout.
Assumption to check: User interface can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more user-friendly approach to monetization.
Assumption to check: In-app purchase prompts can be intrusive.
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
Have you ever had these awkward moments? You want to measure a table but can’t find a tape measure? You need to scan a document urgently but don’t have a scanner nearby? You see a foreign-language menu and have no idea how to read it? **CalcKit: Tip, Convert & Utils** puts more than 50 practical tools in your pocket. Whether for daily life, work, study, or outdoor travel, one phone is all it takes to solve all your troubles instantly. ### Core Features #### Smart Measurement & Location - **AR Distance Meter**: Uses augmented reality technology to accurately measure the length, height and area of objects, more convenient than a traditional tape measure. - **Level Meter**: A must-have for hanging pictures and installing furniture, with 0.1° high-precision calibration for a more refined life. - **Compass & Latitude-Longitude**: Identifies directions for outdoor adventures and locates your current position in real time. #### Document Scanning & OCR - **Text Extraction**: Recognizes text in images by taking a photo, supports Chinese, English and many other languages for easy copying. - **Network Speed Test**: Checks upload and download speeds to see if someone is stealing your network. #### Professional Calculation & Conversion - **All-Purpose Calculator**: Includes mortgage calculation, personal income tax calculation and salary calculation to meet various scenario needs. - **Unit Converter**: Covers exchange rates, length, area, weight, volume and more than 20 unit types, with fast conversion and clear results. #### Daily Life Assistant - **Floating Scrolling Text**: Turns your phone into a cool LED scrolling screen for airport pickups, fan support and events. - **Decision Maker**: Solves your indecision and takes the stress out of choosing. - **Image Conversion**: Converts photos to any format without restrictions. -Payment will be charged to iTunes Account at confirmation of purchase. -Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. -Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Privacy Policy: https://aelaus.com/toolie/privacy.html Terms of User: https://aelaus.com/toolie/terms.html
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
Zustand
React Navigation
TypeScript
Firebase
BUILD KIT DIFFICULTY
Intermediate
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.
