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.
instruments is the best interactive sound picture book featuring 55 musical instruments:
$1.99 · 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 Instruments: map the core Education 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 content variety
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of community engagement
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent progress tracking
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Missing gamification elements
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.
instruments is the best interactive sound picture book featuring 55 musical instruments: tap the image to hear the instrument and see its name in your chosen language (78 languages). large images, real sounds, spoken names. who is it for? ages 1–5 for the picture-book experience. ages 3–15 for language learning and instrument vocabulary. how it works the interface lets a child, alone or with an adult, discover each instrument and its sound. images can advance automatically like a slideshow (adjustable speed) or manually by swiping the screen. the display order is configurable (random or sequential). a long-press on the instrument name lets you choose another display/spoken language. multilingual (78 languages) spoken names and interface available in your language of choice, to build vocabulary and train the ear from an early age. tip: in your device settings, download apple’s premium voices (higher-quality voices provided by ios). why you’ll love instruments? clear, reassuring musical discovery for young children. natural pronunciations and authentic sounds. multilingual (78) to support early learning, vocabulary, and listening. works anywhere works offline and in airplane mode: all images and sounds are stored on device no connection required. orientation portrait and landscape on iphone and ipad. parents and schools – parental gate (settings protected by a random math question). – schools reminder: 50% off via apple school manager. privacy – no ads – no in-app purchases – no tracking – no data collection – no analytics – privacy nutrition label: “no data collected” contact us [email protected] instruments accordion, acoustic guitar, bagpipes, balalaika, bandoneon, banjo, barrel organ, bass drum, bass guitar, bassoon, bugle, castanets, cello, clarinet, claves, congas, crash cymbal, didgeridoo, djembe, double bass, drum kit, duduk, electric guitar, flute, french horn, gong, grand piano, handbell, harmonica, harp, harpsichord, lute, mandolin, maracas, oboe, pan flute, piccolo, pipe organ, recorder, saxophone, sitar, snare drum, synthesizer, tambourine, tenor drum, timpani, triangle, trombone, trumpet, ukulele, upright piano, viola, violin, xylophone supported languages (displayed and spoken) afrikaans, albanian, german, amharic, english, arabic, armenian, azerbaijani, basque, bengali, belarusian, burmese, bosnian, bulgarian, catalan, simplified chinese, traditional chinese, korean, croatian, danish, spanish, estonian, filipino/tagalog, finnish, french, galician, welsh, georgian, greek, gujarati, hausa, hebrew, hindi, hungarian, indonesian, irish, icelandic, italian, japanese, kannada, kazakh, khmer, lao, latvian, lithuanian, macedonian, malay, malayalam, maltese, marathi, dutch, norwegian bokmål, norwegian nynorsk, uzbek, persian/farsi, polish, portuguese (brazil), portuguese (portugal), punjabi, romanian, russian, serbian (cyrillic), serbian (latin), sinhala, slovak, slovenian, swedish, swahili, tamil, czech, telugu, thai, turkish, ukrainian, urdu, vietnamese, yoruba, zulu
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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.