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
Tozzle
-- 2-year-old Madeleine: "Again!"
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
42 ratings · Top 30%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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.
JavaScript is required to complete mailbox verification.
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 Tozzle: map the core Education workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 user-generated puzzles and regular updates.
Assumption to check: Limited puzzle variety
Validate with people who use this workflow before building.
Hypothesis 2
Optimize app performance for a wider range of devices.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Implement features for sharing achievements and competing with friends.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Provide immediate feedback and hints for wrong placements.
Assumption to check: No feedback for incorrect moves
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
-- 2-year-old Madeleine: "Again!" ******* MORE THAN 40 PUZZLES AND CUTE ANIMATIONS! ******* Tozzle supports English, German, French and Spanish! You can choose from more than 40 different shape puzzles, all including cute sound effects and animations. Tozzle is more than your traditional jigsaw puzzle App! Built for children from 1 - 99, Tozzle keeps your toddler entertained while they learn to improve their shape recognition skills and motor activity. Tozzle does not contain any In-App Purchases! It's really easy and fun to play. Just let your toddler pick one out of more than 40 colorful, child friendly puzzles and let them solve it by drag & drop. Once a puzzle is solved your kid can play around with the sound effects and animations by tapping on the figures. An exit button on the bottom left brings you back to the puzzle selection menu. Our team of toddlers tested Tozzle thoroughly and we took their suggestions seriously to create an entertaining but educational App specifically for them. If a child can't find the right place for a piece, a helping arrow guides them to the right slot, so every child can solve every puzzle. Look forward to relaxed car rides and restaurant visits. You can concentrate on your tasks while your child is having fun with Tozzle! If you want to see Tozzle in action please download our free App "Tozzle Lite" from the AppStore. To change the language, select "Settings -> Tozzle -> Language" Follow us on twitter: twitter.com/nodeflexion
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
Zustand
React Navigation
React Native Reanimated
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.
