App Overview

Joist: Estimate Invoice Maker icon

Joist: Estimate Invoice Maker

Joist Software Inc. · Business

Win more jobs and get paid faster with Joist — the ultimate estimate, invoice & job management tool for contractors

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
14,484 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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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/
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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Joist: Estimate Invoice Maker: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Win more jobs and get paid faster with Joist — the ultimate estimate, invoice & job management tool for contractors. Manage your business entirely from your iPhone or iPad. Create professional quotes in seconds, schedule work, accept secure payments, and stay ahead of the competition with the industry's most trusted tool for builders. Whether you are estimating on-site, scheduling upcoming work, or sending professional bills from the office, Joist saves time, keeps you organized, and helps you stay on top of your workday. Note: Payments functionality is currently available in the US & Canada. ——— WHY CONTRACTORS LOVE JOIST • SAVES TIME – Complete administrative work at the jobsite or on-the-go. Stop spending evenings catching up on paperwork, paper notes & digital receipts. • STAY ORGANIZED – Keep every job organized in one place. Connect customer details, estimates, invoices, notes, and schedules so you always know where work stands without digging through texts or spreadsheets. • PLAN WITH CONFIDENCE – See upcoming work in a simple calendar view, avoid scheduling conflicts, and always know what’s coming next. • WIN MORE JOBS – Send your client an estimate before you leave. Be the first to create an estimate & give them the opportunity to say YES on the spot. • SPEED UP ESTIMATING & INVOICING – Build estimates & invoices quicker by selecting from your list of commonly used materials + labor rates. • ACCEPT PAYMENTS – Accept Credit Card & PayPal payments directly through Joist. No more driving around to pick up checks. • EASILY MANAGE CLIENTS – Create, organize & store valuable info to access your clients' data anytime, on the go. • LOOK PROFESSIONAL – Show clients you are the contractor they should trust with customized estimates & invoices. ——— KEY FEATURES • Create & organize jobs, keeping notes, photos, estimates & invoices connected • Schedule visits for every job & track workload in a simple calendar view • Customize estimates & invoices with company info & logo • Attach a client contract & collect a signature on the spot • Accept Credit Card & PayPal payments directly through the app • Build a list of commonly used items, services & materials • Attach photos to your estimates & invoices • Preview, print, or email estimates & invoices on the spot • Create personal messages & digital receipts for your clients • Convert estimates into invoices ASAP • Keep track of customer payments & bills • Export data into your accounting program to reduce costs • Access all your info from any device or the web — Joist is cloud-based. ——— USE CASES & VERSATILITY • On-Site Estimates: Walk through a job & create a quote before leaving the property. • Smart Scheduling: Plan your workday, set up job site visits, and stay on top of active work. • Job Organization: Keep estimates, invoices, client notes & photos grouped neatly under each job. • Instant Invoicing: Convert approved quotes into professional bills & send instantly. • Mobile Payments: Accept payments immediately upon job completion. • Project Tracking: Use the estimator for accurate material & labor margins. ——— WHO USES JOIST General contractors, handymen, electricians, plumbers, builders, landscapers, roofers, painters, HVAC, flooring, remodeling, construction & more! ——— WHAT OTHER CONTRACTORS ARE SAYING "Now I can do quotes on the fly! I don't have to walk through the job & write everything down; it's all programmed into my iPad right from material cost to cost per square foot! This app is so awesome." ——— JOIST SUBSCRIPTIONS You can subscribe to Joist Pro or Joist Elite (Monthly/Annual). Subscriptions automatically renew unless auto-renew is turned off 24 hrs prior to the end of the current period. Manage settings in App Store or iTunes. ——— Joist is FREE to Download & FREE to try! Available on iPhone, iPad & desktop. Get support FAST: [email protected] | www.joist.com | In-app live chat Terms: https://www.joist.com/terms/ Privacy: https://www.joist.com/privacy-policy/

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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

Offer extensive templates and customization features.

Assumption to check: Limited customization options for estimates/invoices

Validate with people who use this workflow before building.

Hypothesis 2

Implement better tracking and reminders for payments.

Assumption to check: Difficulty in tracking payment statuses

Validate with people who use this workflow before building.

Hypothesis 3

Add multi-user collaboration for shared estimates and invoices.

Assumption to check: Lack of collaboration features

Validate with people who use this workflow before building.

Hypothesis 4

Design a more minimalist interface with better organization.

Assumption to check: User interface can feel cluttered

Validate with people who use this workflow before building.

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
React Navigation
Axios
React Query
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.