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
Friday AI Email Writer
Enhance your writing with our E-mail assistant
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
9,708 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 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 Friday AI Email Writer: 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
Add more formatting and template options.
Assumption to check: Limited email customization options
Validate with people who use this workflow before building.
Hypothesis 2
Improve AI accuracy and offer user feedback.
Assumption to check: AI generation can be inaccurate
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription tiers and clarify benefits.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline access for generated emails.
Assumption to check: No offline functionality
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
Enhance your writing with our E-mail assistant. The ultimate app was created for anyone looking to improve their writing skills. Powered by AI, our app provides personalized suggestions and story tellings to help you write better, faster, and more efficiently. The app can assist with everything from creating a letter to proofreading and providing suggestions for improving your writing! Whether you want to write to your partner, friend, or colleague, get advice, or find new connections, Friday has it covered. Whether you're a student, a professional, or someone who wants to improve their writing, Friday is here to help. With its powerful AI technology, the app can assist with everything from proofreading and grammar checking to suggestions for improving your writing. Open the app, type or paste your text or just record your voice request, and let Friday do the rest. In just a few seconds, you'll have a beautifully polished, error-free document ready to be shared with the world. With our free trial, you can enjoy a 3-day free period with unlimited access to all features, including composing emails, replying to messages, using prompts, and personalizing your emails with your social profile. So why wait? Download Friday today and start writing like a Pro! Privacy Policy: https://telegra.ph/Friday-AI-E-mail-Assistants-Privacy-Policy-07-24 Terms of Use: https://telegra.ph/Terms--Conditions-07-26
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
@react-navigation/native
@supabase/supabase-js
react-native-paper
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.
