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.
Join 3.5 million customers using Flex
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Flex - Split Your Rent in 2: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Join 3.5 million customers using Flex. Split your rent into 2 payments—the first when it's due, the second on a date you choose during the month. When unexpected expenses hit, Flex gives you breathing room, whether you're paid weekly, biweekly, or have variable income. Your landlord or property gets paid upfront. Help build your credit history with on-time payments. Still have money left over on the 1st. HOW IT WORKS 1. Apply for Flex. If approved, set up your address and choose your payment schedule. 2. Your rent gets paid in full to your landlord or property. 3. You split rent payments in 2: half when rent is due, half before the end of the month. BUILD CREDIT FOR PAYING RENT Your on-time payments are reported to all major credit bureaus at no extra cost, so the rent you already pay can help to build credit history. SEE, SPLIT AND PAY YOUR BILLS IN ONE APP Flex is the app to split and pay your bills. Split your rent, car payment and everyday bills into smaller payments on dates that work for you. TRANSPARENT PRICING, BUILT TO GET YOU AHEAD What it costs: up to $5.99/month for the Flex membership, a 0.5% processing fee on the total bill amount, and a split fee of up to 3% of what you borrow (no reduction with early repayment). Debit card: no added charge. Credit card: 2.5% surcharge. FAQs - Can I pay rent, or my bills, in installments? Yes. One payment when your rent is due, a second later in the month, on a schedule you choose. - Is Flex a loan? No. Flex provides a line of credit through its bank partners, not a loan. - Does Flex report to credit bureaus? When turned on, on-time payments are reported to TransUnion, Experian, and Equifax, which helps build your credit history, included free with your Flex membership. *The #1 rent splitting app based on app store reviews, 2026. Disclosure Flexible Finance, Inc., together with its subsidiaries ("Flex"), is a financial technology company, not a bank. All loans, lines of credit , banking services, loan disbursements, and payment transmissions are offered by Lead Bank or Column N.A., Members FDIC. An application and credit assessment are required for approval. Availability of Flex services is subject to landlord and biller eligibility. Flex Rent users may pay a recurring monthly membership fee of $5.99; membership automatically renews until canceled. Flex Rent and Flex Bills users must pay a processing fee of 0.5% of your total rent or bill amount when paying your rent or bills through Flex services (an additional 2.5% surcharge applies when using a credit card). A split fee of up to 3% for each line of credit, based on how much you borrow each month, is also charged and cannot be reduced with early repayment. Flex Pay in Full users who are not extended a line of credit, are also subject to the 0.5% processing fee of their total rent amount (an additional 2.5% surcharge fee applies when using a credit card). Flex Pay in Full users who are not extended a line of credit are not subject to a recurring monthly membership fee. Other third party fees may apply. See your offer for more details. Positive rent payment history and information about your loan may be reported to one or more national credit bureaus. Your Flex payment history may impact your access to additional Flex services. All loan amounts vary based on eligibility. Any graphics are for illustrative purposes only. Terms and conditions apply. Neither Flex nor any of its subsidiaries disburse loan proceeds or engage in the movement of consumer funds. Brokering activities are performed by Flexible Finance Brokering, Inc. Servicing and collection activities are performed by Flexible Finance Servicing, Inc. Licenses Flexible Finance Brokering, Inc., Nationwide Multistate Licensing System ("NMLS") ID #2599800 Flexible Finance Servicing, Inc., NMLS ID #2256673 Please refer to NMLS Consumer Access for information on our licenses.
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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
Assumption to check: Users find it difficult to manage multiple payment schedules.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited payment methods available.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Users report bugs with notification reminders.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of personalized budgeting features.
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.