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
BiP - Messenger, Video Call
What is BiP?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
10,883 ratings · Top 15%
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/
Preview a sample Build Kit No email needed
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 BiP - Messenger, Video Call: 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
Implement real-time updates using WebSocket for instant messaging.
Assumption to check: Users experience delays in message delivery
Validate with people who use this workflow before building.
Hypothesis 2
Provide customizable themes and chat backgrounds.
Assumption to check: Limited customization options for chat themes
Validate with people who use this workflow before building.
Hypothesis 3
Optimize video streaming with adaptive bitrate technology.
Assumption to check: Inconsistent video call quality
Validate with people who use this workflow before building.
Hypothesis 4
Enhance notification settings for better user control.
Assumption to check: Poor notification management
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
What is BiP? BiP is developed by Turkish engineers and being used by millions worldwide, BiP is a reliable and easy-to-use communication app. From rich messaging options to crystal-clear voice and video calls, BiP helps you stay connected with your friends and groups anytime. Do I Need to Pay to Use BiP? BiP is offered free of charge in app stores, and you don’t need to pay any subscription fee to use it. Moreover, thanks to certain operator agreements, you can message, make voice and video calls on BiP without using your mobile data—meaning you can continue communicating seamlessly even if you don’t have a mobile data plan. You can find details of the operators and tariffs that allow you to use BiP without consuming your data at www.bip.com. Discover BiP’s Features! The latest version of BiP offers many practical and fun features designed for seamless, real-time communication. Secure communication: Privacy comes first on BiP: neither BiP nor anyone else can access your chats or calls. All communications are encrypted with the highest international standards, and your data is never saved or passed on to third parties HD-quality calls: Stay connected with high-quality one-on-one and group voice & video calls. Rich messaging features: Enjoy instant messaging with disappearing messages, live location sharing, money transfers, instant translations in over 100 languages, instant video, voice recordings, stickers, and many more fun and useful features. Group chats: You can chat with your friends, family, and communities, and create polls. Reminders: Set one-time or recurring reminders on messages you send to yourself, and BiP will notify you when the time comes. Channels: Discover hundreds of channels that make life easier and offer content tailored to your interests. Status: Share moments from your life with photos and videos. Emergency: In case of an emergency, add your trusted contacts and share with one tap that you’re safe or in need of help, including your location details. If you want to reach us: https://bip.com/tr/ https://www.instagram.com/bip/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
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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.
