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
Bionic Tape
Unfold, pick a tape, fold, listen.
$2.99
PRICE
$2.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.0
1 ratings · Below Average
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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A product spec, screen plans, and build steps for your coding agent.
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What's included
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Unfold, pick a tape, fold, listen. Bionic Tape turns your iPhone into a cassette deck. Unfolded, your playlists and albums sit on the shelf as cassettes, each in its case with cover art. Tap, and the tape slides into the deck. Fold the phone, and the tape rolls on the cover screen: reels spin, the tape hisses, the keys click. WHAT'S INSIDE • Fold instead of tap: the hinge decides whether you pick tapes or listen. Folding starts playback. • Keys you can press: real 3D keys with travel, click and haptics. PLAY latches while the tape is running. • Volume you can feel: a knob with an LED ring, a thumb wheel or a touch pad, depending on device and skin. 16 detents, each one clicks. • SHUFFLE: a slide switch plays your tapes in random order. • OUT: send the music to smart speakers, Bluetooth speakers or headphones. • Window: look through the window at the cassette with its handwritten label and the current song. The tape pack shows how much of the tape is left. • Tent mode: stand your iPhone up as a tent and the cassette becomes the show, with your playlist's cover art as the label. Tap to play/pause, swipe for the next track. • Full screen: tap the cassette and only the tape remains. • Seven skins: Translucent in see-through turquoise, 1983 in the style of 80s office computers, Sport in bold 80s yellow, Classic retro blue, Bionic OS, Cyberpunk and HMZ.swiss. • TAPE FX: hiss and clicks can be switched off. MUSIC • Apple Music: your playlists and albums as cassettes. Requires an Apple Music subscription. • Your own music: MP3, FLAC, AAC, ALAC, WAV and AIFF from the Files app, every album a cassette. Plays offline and in the background, with lock screen controls. • Demo tapes: work right away, no account needed. • Spotify and more services follow as free updates. BUILT FOR THE IPHONE DUO Made for unfolding and folding. On iPhones without a hinge, a button switches between shelf and player. NO TRACKING No ads, no analytics, no account with us. Buy once, no subscription. A project from the HMZ workshop, Zurich. Feedback welcome: hmz.swiss/en/walkman
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
