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.
Adaptivity is an invaluable tool for developers and designers
$7.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Adaptivity (A): map the core Developer Tools workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited customization options for layouts
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Steep learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Occasional lag during complex layout edits
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase confusion among users
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Adaptivity is an invaluable tool for developers and designers. Use it to visualize how Size Classes and margins for layout, readable content and the safe area look on real devices and how they change with respect to orientation, iPad multitasking and Dynamic Type size changes. A comprehensive System Images browser shows the different SF Symbols data sets across iOS versions with availability, localization and name change information. There are also views for visualizing Dynamic Type styles, System Colors, System Fonts and System Materials. TESTIMONIALS • “Adaptivity is not just highly recommended – it’s essential” — Paul Hudson, Hacking With Swift article “8 essential apps for iOS developers”, 30th March 2020. • “It's a very, very good tool as a reference for both developers and designers” — Gui Rambo, Stacktrace podcast episode #77, 1st April 2020. • “I'm not trying to spend your money, but to me this is a no-brainer” — Sean Allen YouTube video “Indie Dev Apps”, 12th April 2020. MAIN FEATURES • Visualize sizes for full view, layout margins, readable content guide and safe area layout guide. • Sizes displayed in points or pixels. • Regular or large navigation bar titles. • Toggle status bar and navigation bar/toolbar/tab bar visibility. • Activity View Controller support for sharing a snapshot image of each view. • iPad multitasking and multiple window support (see note). • Dark appearance support (requires iOS/iPadOS 13 or later). • Setting to force right-to-left layout. • Keyboard shortcuts. • Keyboard navigation (requires iPadOS 15 or later). • Handoff actions from Adaptivity (A), (B) or (C) on one device to Adaptivity (A) on another. • External display support. OTHER VIEWS • Popover, Form/Page Sheet, Full Screen and Automatic modal presentations. • Customise Sheet Presentations on iOS/iPadOS 15 or later. • Tab Bar Controller. • Table View Controller. • Classic style Split View Controller. • Double and triple column style Split View Controllers (requires iOS/iPadOS 14 or later). • Keyboard Dodging and Custom Keyboard. • Dynamic Type styles for the current Content Size Category. • Explore Pointer Interactions (requires iPadOS 13.4 or later and a trackpad or mouse). • Explore System Colors. • Explore System Fonts. • Explore System Images (requires iOS/iPadOS 13 or later). Choose which SF Symbols data set to view, configure rendering modes and much more. • Explore System Materials (requires iOS/iPadOS 13 or later). EXTENSION TARGETS • Siri shortcut with custom response UI (requires iOS 12 or later). • Pre- and post-iOS 14 style Widgets to show layout. • iOS 14 style Widgets to show random System Images. • iOS 14 style Widgets to show Dynamic Type text styles. • iOS 16 lock screen Widgets to show layout. • iOS 16 lock screen Widgets to show random System Images. • Notification Content Extension. • Watch App (requires watchOS 4 or later). • iMessage App. Note: Adaptivity (A) supports multiple windows on iPadOS 13 or later. On earlier iOS versions, Adaptivity (B) must also be downloaded to run Adaptivity twice using Split View or Slide Over iPad multitasking. Adaptivity (A) is a universal purchase and includes a Mac Catalyst version of the app. Buying one allows the other to be downloaded at no extra cost using the same Apple ID. Adaptivity (C) has the same reduced features as Adaptivity (B) but only supports iPhone. Use it to visualize how an iPhone‑only app appears on iPad. For more information see https://hacknicity.com/adaptivity
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.