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
PotoHEX - HEX File Editor
The PotoHEX is an application that is used to create, explore and modify arbitrary files on your iOS device.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.5
16 ratings · Top 50%
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 included17 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for PotoHEX - HEX File Editor: map the core Developer Tools 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
Competitive pricing with generous free tier
Assumption to check: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Focus on most-requested features first
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Optimize for 60fps, fast load times
Assumption to check: Poor performance
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
The PotoHEX is an application that is used to create, explore and modify arbitrary files on your iOS device. MAIN FEATURES: • Byte and Character level inspecting and editing • Select any from UTF-7/8/16/32/BE/LE or 100+ other encodings for character-level inspecting & editing • Use predefined encoding groups for simplifying the search for an encoding • Search for the desired encoding by name • Quick view of selected bytes/characters directly in the encoding selection table • Replace or Insert bytes and characters • Inspect and modify integer types at the cursor position • Select a byte or text region for the subsequent actions: • Convert text to another encoding. • Сalculate checksums: Adler-32, BSD checksum, CRC-8, CRC-16, CRC-32, CRC-64, CRC-8/CDMA2000, CRC-8/DARC, CRC-8/DVB-S2, CRC-8/EBU, CRC-8/I-CODE, CRC-8/ITU, CRC-8/MAXIM, CRC-8/ROHC, CRC-8/WCDMA, CRC-16/CCITT_FALSE, CRC-16/AUG_CCITT, CRC-16/BUYPASS, CRC-16/CDMA2000, CRC-16/DDS-110, CRC-16/DECT-R, CRC-16/DECT-X, CRC-16/DNP, CRC-16/EN-13757, CRC-16/GENIBUS, CRC-16/MAXIM, CRC-16/MCRF4XX, CRC-16/RIELLO, CRC-16/T10-DIF, CRC-16/TELEDISK, CRC-16/TMS37157, CRC-16/USB, CRC-A, CRC-16/KERMIT, CRC-16/MODBUS, CRC-16/X-25, CRC-16/XMODEM, CRC-32/BZIP2, CRC-32C, CRC-32D, CRC-32/MPEG-2, CRC-32/POSIX, CRC-32Q, CRC-32/JAMCRC, CRC-32/XFER, CRC-64/WE, and CRC-64/XZ. • Сalculate hashes: BLAKE/BLAKE2, MD2, MD4, MD5, MD6, SHA1, SHA2 (SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/256, SHA-512/224), SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128, SHAKE256, RIPEMD-128/160/256/320, Tiger/Tiger2, Whirlpool and STREEBOG (Стрибог, ГОСТ 34.11-2018) • Encode or Decode from or to Base16, Base32(RFC 4648, hex, Crockford's, and z-base-32 alphabets), Base58(BITCOIN, RIPPLE, FLICKR, and GMP alphabets), Base64, Ascii85, and Z85(ZeroMQ) encodings • Encrypt or Decrypt using AES 128/192/256, BLOWFISH, DES, 3DES, RC2, and RC4 algorithms • Compress or Extract by Deflate/Inflate, BZIP2, and LZMA/LZMA2 algorithms. • Export the selected region as a QR code. • Fill the region with a given multibyte pattern • Cut the region • Copy and Paste the region • Undo/Redo • Clone or delete files INTERFACE • Multi-tab interface • Tabs can be reordered or removed by long pressing on them and dragging • Change the width of an arbitrary column in the file data table • Jump to arbitrary file offset by tapping on the Offset column • Choose from Decimal or Hexadecimal formats for the file offset values by tapping on the Offset column header • The space occupied by the file data table and the property sheet (or their relative arrangement) can be tuned by dragging (or double-tapping) the delimiter handle between them • Zoom in/out almost every part of the user interface • Light and Dark themes depending on the device settings AUXILIARY • File renaming • Change the size of the file • Select the number of bytes in a row • Find & replace an arbitrary text or byte fragment with an arbitrary text or byte fragment • Access the App's Document folder through a Web Browser LIMITATIONS • Undo/Redo works for modifications up to 16Mb This app by default has restrictions on file content visibility. The visible content of any file is restricted by the first 256 bytes. To remove those restrictions you can start a monthly auto-renewable subscription or buy permanent full access. Privacy Policy: https://apotocki.github.io/potohex/privacy.pdf Terms of Use: https://apotocki.github.io/potohex/terms-of-use.pdf
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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
Supabase
RevenueCat
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.
