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
Fileso: File Manager|unzip|rar
Fileso: The Ultimate App for Efficient File Management! Supports importing, viewing, compressing, editing, and converting multiple file formats, including images, videos, audio, documents, and code
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
71 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.
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 Fileso: File Manager|unzip|rar: 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
Implement tagging and advanced filtering options to improve organization.
Assumption to check: Lack of advanced organization features such as tags or search filters.
Validate with people who use this workflow before building.
Hypothesis 2
Design a more user-friendly onboarding process with tutorials.
Assumption to check: Confusing interface for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Expand file format support for better usability.
Assumption to check: Limited file format support for unzipping.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize file handling and performance for large files.
Assumption to check: Inconsistent performance with large files.
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
Fileso: The Ultimate App for Efficient File Management! Supports importing, viewing, compressing, editing, and converting multiple file formats, including images, videos, audio, documents, and code. Effortlessly handle WebDAV and Wi-Fi files with robust editing and preview features to meet all file management needs. Download now to boost your efficiency! ## File Import & Management * Mount folders to the app's workspace * Import images and videos from the photo library * Import from files * Batch scan documents with the camera * Upload and download files via Wi-Fi browser * Manage WebDAV files ## File Viewing * Supports popular image formats, live photos, HDR, PAM, AVIF, and WEBP * Syntax highlighting for HTML, XML, JSON, Ruby, JavaScript, Rust, Golang, and dozens of other code formats * Video support: MP4, MOV, MKV, AVI, WMV, FLV, RMVB, ASF, OGV, and more * Audio support: MP3, WAV, WMA, FLAC, APE, etc. * Document viewing: Word, Excel, PowerPoint, Numbers, Keynote, Pages, RTF, CSV * eBook formats: EPUB, MOBI * Design and animation files: Sketch, PSD, AI, AVIFS, SVGA, Lottie * Font file previews: TTF, OTF, TTC, DFONT * JSON and Markdown previews * 3D file support: DAE, FBX, OBJ, SCN, MD3, ZGL, XGL, WRL, STL, SMD, RAW, Q3S, Q3O, PLY, MESH, OFF, NFF, M3SD, MD5ANIM, MD5MESH, MD2, IRR, IFC, DXF, COB, BVH, B3D, BLEND, HMP, 3DS, 3D, MS3D, MDL, ASE, GLTF, MTL, 3MF * HEX view for any file * eBook support: MOBI, EPUB * MHT, MHTML * CHM preview with search and index support * Diff tool for comparing two text files * XMind previews * SVG, SVGA * Telegram animated stickers (TGS format) * URL, NFO, RTF, CRX ## File Compression & Decompression * Extract files (with password support, multi-volume): CAB, ARJ, LZH, TAR, GZ & TAR.GZ, BZ2 & TAR.BZ2, UUE, JAR, 7Z, XZ, Z (Unix compress), CRX * ZIP compression (with password support) * Compress image and video file sizes * Live photo support ## File Editing * HTML, XML, JSON, Plist, Ruby, JavaScript, Perl, and other script editing * Image editing * Batch renaming with replace, insert, and regex support ## File Conversion * Image format conversion: TIFF, GIF, WEBP, PNG, JPG, BMP, etc. * Video conversion: MP4, MOV, M4V, 3GP, AVI, MKV, MPG, VOB, with resolution adjustments (480P, 720P, 1080P) * Audio conversion: M4A, WAV, MP3, CAF, FLAC * XLSX to CSV * Telegram animated sticker (TGS) to GIF * Text encoding conversion: GBK, UTF-8, UTF-32, UTF-16, GB2312, BIG5, etc. * Markdown to HTML * JSON to XML, XML to JSON * JSON to YAML, YAML to JSON * HTML to Text * SVG to PDF, SVG to JPEG * Image to PDF with multi-image merging into one PDF * PDF splitting and merging * MHT, MHTML to HTML conversion * Live photo to GIF, video conversion Privacy Policy: https://www.joyk.com/en/doc/fileso-privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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
Zustand
react-navigation
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.
