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
Instant Save+ for photos video
Instant Save+ is the fastest, easiest and free app to help you with photo, multi-photos, videos, reels and TV videos.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
643 ratings · Top 30%
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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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 Instant Save+ for photos video: map the core Social Networking 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
Offer support for more media types like GIFs and Stories.
Assumption to check: Limited media types supported for saving
Validate with people who use this workflow before building.
Hypothesis 2
Implement better media compression techniques.
Assumption to check: Inconsistent performance with large files
Validate with people who use this workflow before building.
Hypothesis 3
Create detailed FAQs and user guides.
Assumption to check: Lacks a robust help section
Validate with people who use this workflow before building.
Hypothesis 4
Add options to share saved media directly to social networks.
Assumption to check: No social sharing features
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
Instant Save+ is the fastest, easiest and free app to help you with photo, multi-photos, videos, reels and TV videos. • 100% Free App • No Login required • No In-App Purchase or Subscription required to use any feature. • Beautiful, minimal design. • Dark Mode Support. • View History of recent posts. SALIANT FEATURES: • Full resolution photos, multi-photo, reels and videos. • View original post and user profile. • View most recent posts that you've seen (i.e. View History) • Show/hide attribution mark from settings on sidebar menu. • The caption is automatically copied to clipboard for you to paste while reposting. STEPS TO REPOST: 1. Open the IG app or website in safari browser on your iPhone. 2. Copy link from the post (...) or address bar. 3. Return to the app and wait for the post to appear automatically. 4. Swipe side-to-side on multi-photo post. If you like the app, please don't forget to leave us a fantastic rating and review. That helps a lot! Disclaimer: This app is not endorsed, sponsored by or affiliated with IG.
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
Supabase
Zustand
React Navigation
react-native-image-picker
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.
