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
Session - Private Messenger
Session is a new breed of private messenger, built on a unique network of user-operated servers spread all over the world
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
4,990 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 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 Session - Private Messenger: 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 WebSocket for instant message delivery and notifications.
Assumption to check: Users often face issues with notifications not being real-time.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to personalize chat backgrounds and themes.
Assumption to check: Limited customization options for chat backgrounds.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce message threading for better organization.
Assumption to check: Messages can be difficult to manage in large groups.
Validate with people who use this workflow before building.
Hypothesis 4
Implement end-to-end encryption and clearly communicate privacy policies.
Assumption to check: Privacy concerns about data storage.
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
Session is a new breed of private messenger, built on a unique network of user-operated servers spread all over the world. With no central servers, Session can’t leak or sell your data. And with Session’s private routing protocols, your messages are completely safe. No trackers, no leaks — send messages, not metadata. • Fully private account creation: No phone number or email needed to create an Account ID • Decentralized server network: No data breaches, no central point of failure • No metadata logging: Session doesn't store, track, or log your messaging metadata • IP address protection: Device IP addresses are never exposed to the person you're talking to or the servers holding your data • Closed groups: Private, end-to-end encrypted group chats for up to 100 people • Secure attachments: Share voice snippets, photos, and files with Session's secure encryption and privacy protections • Free and open-source: Don’t take our word for it — check Session's code yourself Session is free as in free speech and free as in free of ads and trackers. It is stewarded by the Session Foundation, a Swiss-based foundation dedicated to advancing digital rights and innovation. Take back your online privacy today — download Session. Want to build from source, report a bug, or just take a look at our code? Check out Session on GitHub: https://github.com/session-foundation/session-ios
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.
