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
Keka
Keka is a full featured file archiver, as easy as it can be.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
161 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 included18 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.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Keka: 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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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
Expand formats to include more options like 7z or RAR.
Assumption to check: Limited file format support for compression
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature to preview content before extraction.
Assumption to check: No preview options for compressed files
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set custom compression levels and formats.
Assumption to check: Lack of customization for compression settings
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud storage support for easier file management.
Assumption to check: No cloud integration
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
Keka is a full featured file archiver, as easy as it can be. With Keka you can compress as many files as you want in a bunch of formats. You can also encrypt them to store and share securely and with privacy. Keka can also browse and extract lots of compressed files, from ZIP and 7Z to RAR archives. Whether they are encrypted or encoded in with old charsets this is not a problem for Keka. Compression formats supported: 7Z, ZIP, TAR, ZSTD, GZIP, BZIP2 and AppleArchive (AAR) Extraction formats supported: 7Z, ZIP, RAR, TAR, GZIP, BZIP2, AAR, XZ, ZSTD, ISO, LZMA, EXE, CAB, MSI, PAX, JAR, APK, APPX, XPI, IPA, CPGZ, CPIO, XIP, CPT and many more Terms of Use: https://www.keka.io/termsofuse
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.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
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BUILD KIT DIFFICULTY
Advanced
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.
