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
Nintype
Nintype, as used by over 150k people!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
167 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.
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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 included16 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 Nintype: map the core Productivity 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 create and customize their own typing exercises.
Assumption to check: Limited customization of exercises
Validate with people who use this workflow before building.
Hypothesis 2
Add social features to compete with friends or share progress.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Provide real-time feedback on typing errors and suggestions for improvement.
Assumption to check: No feedback on typing errors
Validate with people who use this workflow before building.
Hypothesis 4
Implement a one-time purchase option alongside subscriptions.
Assumption to check: Subscription model may deter 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
Nintype, as used by over 150k people! ----------------------- Transform your iPhone or iPad into a highly productive device where you can actually type relatively quickly with it - so writing emails, reports and articles are much nicer, because you can type faster on the iPad/iPhone than most people can on a desktop keyboard! This notes app comes with a 3rd party keyboard, which is most probably what you're after. Keyboard Features: - Two-Handed Sliding Keyboard - construct words with slides and taps - A top bar to correct previous words quickly - Slide left/right at the spacebar to move the cursor quickly - Backspace slide to quickly erase words - Edge slide shortcuts to quickly add punctuations - Quickpaste menu (press-hold caps) - Height / layout adjustment. Can split, align right, left, etc. - Flick autocomplete - Number pad layout quick access (slide right from the 123 button, at the bottom left) - Calculator which actually counts things - numbers ready to be inserted - Customizable theme - with a lot of presets - Autospace Mode (Automatically flushes in adjustable time, dynamic timing, new and improved! recommended for expert users) - Emojis! Press hold the topleft button at the topbar! - Emojify - type any english word (e.g happy), slide down from X, and select the emoji you want! Supported Languages: Priority Support - English Secondary Support - Danish, Dutch, French, German, Indonesian, Italian, Norwegian, Polish, Portuguese, Romanian, Spanish, Swedish Nintype App (A note-taking app) features: - Subfolders, unlimited depth too - Shortcuts System - Recent Notes History system - A Robust Archive system. - Quick Share Shortcuts
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
Victory Native
React Navigation
Async Storage
Axios
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.
