App Overview

Cleave for EPUB icon

Cleave for EPUB

Samuel Painter · Books

Cleave is an on-device EPUB metadata editor for iPhone and iPad

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
2 ratings · Top 5%

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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Cleave for EPUB: map the core Books 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

Include support for additional file formats like PDF.

Assumption to check: Limited file format support

Validate with people who use this workflow before building.

Hypothesis 2

Add features like text highlighting, annotations, and bookmarks.

Assumption to check: Lack of advanced reading features

Validate with people who use this workflow before building.

Hypothesis 3

Implement a cloud storage option for syncing EPUB files across devices.

Assumption to check: No cloud sync capabilities

Validate with people who use this workflow before building.

Hypothesis 4

Provide more themes and font options for a personalized reading experience.

Assumption to check: Minimal customization options

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

Cleave is an on-device EPUB metadata editor for iPhone and iPad. Drop a book in, and it cleans up the messy title, author, and publisher fields in seconds — no account, no uploads, no tracking. Designed for readers who sideload books onto a Kindle, a Boox, a Palma, a Kobo, or into KOReader and Calibre. If you've ever had a library full of files named "The_Book_(z-lib.org)_(1).epub" with title "The Book (z-lib.org) - Copy", Cleave fixes them. FEATURES • Auto-clean on load Strips source-site watermarks from title, author, and publisher. Normalizes author-name order ("Austen, Jane" → "Jane Austen" or vice versa). Cleans file junk like "(1)", " - copy", " final". All rules are configurable. • Web enrichment Fills missing description, publisher, date, ISBN, series, and subjects from Apple Books, Open Library, and optionally Google Books. Anonymous queries — no account, no identifier sent. • Cover picker Fetches candidate covers from Apple Books and Open Library in one tap. Pick one, revert anytime, or use your own image from Photos. • Source-watermark page stripping Detects and removes the one-page "downloaded from" ad pages that some redistributors inject. • Rename by template Rebuild filenames from {author}, {title}, {series}, {seriesIndex}, {year}. Presets: Default, Calibre, Year-suffix, Series-first, Title-only. • Directory structure Save directly into a Calibre-style Author/ subfolder if your reader expects it. • Share sheet integration Share any EPUB from Files, Safari, Mail, or another app — Cleave picks it up, cleans it, and hands it back for saving. • Batch support Drop a bunch of files at once. Cleave walks you through them one by one with a running counter. PRIVACY Cleave does not collect any personal data. There is no account, no backend, no analytics, and no advertising SDK. The only network requests are anonymous metadata/cover queries to three public APIs (Apple Books, Open Library, Google Books) — none of which receive any user identifier. File processing happens entirely on your device. Your books never leave your iPhone or iPad. For power users: a diagnostics screen shows the share-extension log, the App Group inbox, and all settings. Everything is editable. SUPPORT Questions, bug reports, feature requests: cleave-whidbey.vercel.app/support Privacy policy: cleave-whidbey.vercel.app/privacy Cleave is designed by a small team who sideload books every week. If it saves you ten minutes a month, it's doing its job.

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.

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BUILD KIT DIFFICULTY
Intermediate

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.