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
Braintoss
Braintoss captures a thought in seconds—type, speak, or photograph it—and sends it to your email or webhook destinations in one flow.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
49 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/
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 Braintoss: map the core Productivity 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
Allow users to customize note backgrounds and fonts.
Assumption to check: Limited customization options for notes
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud sync to access notes from multiple devices.
Assumption to check: No syncing across devices
Validate with people who use this workflow before building.
Hypothesis 3
Support multiple audio formats and better playback controls.
Assumption to check: Recording feature has limited format support
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI and improve navigation for better user flow.
Assumption to check: User experience can feel cluttered
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
Braintoss captures a thought in seconds—type, speak, or photograph it—and sends it to your email or webhook destinations in one flow. WHAT YOU USE IT FOR • Voice notes transcribed and emailed • Photos of whiteboards, receipts, documents, or business cards—sent with a useful subject • Quick typed reminders and to-dos • Share from Safari, Mail, Photos, and other apps into Braintoss, then send where you want VERSION 10 Braintoss 10 is rebuilt as a native iOS app with a modern capture screen, clearer Settings, and steadier delivery and retries. Long-press Send (or Edit in History) to choose destination, subject, and optional message body before sending. Share extension and Apple Watch work with Quick or Advanced modes. Dark mode on the main screen. Optional on-device speech and image analysis for captions; sending uses secure connections to Braintoss’s delivery service. PRIVACY, LOCAL-FIRST Your captures go to the destinations you configure. App Store builds ship with optional usage telemetry turned off by default. Optional Help & Support Debug Mode can add context to emails you choose to send to support; logs stay on your device unless you share them. Learn more: braintoss.app/support — Privacy: braintoss.app/privacy
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
Zustand
Supabase
expo-av
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.
