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.
ComicFlow converts CBR and CBZ comic archives to PDF, reads them directly, and organizes your collection — 100% offline and private
$2.99 · 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 ComicFlow - CBR & CBZ to PDF: map the core Utilities 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 file format support (only CBR/CBZ)
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No cloud storage integration
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of advanced editing features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance on larger files
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.
ComicFlow converts CBR and CBZ comic archives to PDF, reads them directly, and organizes your collection — 100% offline and private. No ads, no account, no subscription. CONVERT CBR/CBZ TO PDF Convert comic book archives to PDF with one tap. ComicFlow extracts every page from your CBR, CBZ, RAR, and ZIP files and builds a clean, correctly ordered PDF in seconds. - Three quality settings: Low for sharing, Medium for everyday reading, High for collectors - Batch conversion: queue multiple files and watch per-file progress CBZ EXPORT — FREE FOR EVERYONE Turn any comic into a standard CBZ that opens natively on Kobo, Boox, PocketBook, KOReader, and practically every comic reader app. No re-encoding, no quality loss. Included in the base app — no purchase needed. READ COMICS DIRECTLY — NO CONVERSION NEEDED Open CBR, CBZ, and PDF files instantly in the built-in reader, optimized for high-resolution comic pages. - Double-tap or pinch to zoom into artwork - Tap zones for one-handed page turns - Reading position saved automatically for every file - Bookmark pages and jump back anytime ORGANIZE YOUR COLLECTION - Custom collections for series or genres - 5-star ratings, personal notes, and tags - Reading status: unread, reading, completed - Instant search; filter by publisher, year, genre, rating, or status - ComicInfo.xml metadata read automatically FLEXIBLE READING MODES - Single page, double-page spread, or vertical scroll for webtoons - Right-to-left page order for manga - Thumbnail grid for quick navigation - Full iPad keyboard control: arrow keys, Space, T for thumbnails, B for bookmarks, and more iCLOUD SYNC Reading progress, bookmarks, ratings, and notes sync across your Apple devices. Optional, no account needed — and it never uploads your comic files. COMICFLOW PRO — OPTIONAL, ONE-TIME UPGRADE The base app is complete and stays that way. Pro is a single in-app purchase — pay once, keep it forever, no subscription — that adds: - Face ID-locked collections: keep private comics behind Face ID, Touch ID, or your passcode - Reader presets: save your manga, western, and webtoon setups and switch in one tap - EPUB export for e-readers: fixed-layout EPUB3 tuned for Kobo, Boox, reMarkable, and PocketBook, with a .kepub option for Kobo - E-ink image optimization: auto-crop, contrast and sharpening tuned per device, grayscale palettes, double-page splitting for manga, webtoon strip splitting An honest note on Kindle: Kindle devices don't open sideloaded EPUB files. ComicFlow's EPUB export works together with the free Calibre desktop app to get comics onto a Kindle — the app explains the exact steps instead of pretending it's one tap. 100% OFFLINE AND PRIVATE No internet required. No account. No tracking. No ads. Your comics stay on your device, and your reading habits are nobody's business but yours. FAIR PRICING You pay for the app once and get the full converter, reader, and library. Pro is optional and also a one-time purchase. Nothing renews, expires, or nags you. SUPPORTED FORMATS CBR, CBZ, RAR, ZIP, and PDF — opened from the Files app, email, cloud storage, or any sharing app. IN 18 LANGUAGES English, German, Spanish, French, Italian, Japanese, Korean, Portuguese (Brazil), Simplified Chinese, Traditional Chinese, Turkish, Polish, Dutch, Indonesian, Thai, Vietnamese, Ukrainian, and Swedish.
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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.