AI Invoicing App Builder for Software Agencies
Stop rebuilding the same invoice in a document every week. Tell Mythex how your software agency charges and it builds an invoicing app with clients, line items, totals, tax and a paid/unpaid list.
Who it's for
Owners of software agencies who want invoices numbered, stored and searchable without paying per month for accounting software.
What you can build
- Clients with billing details and payment terms
- Invoices with line items for custom builds and staff augmentation, tax and totals
- A PDF you can download or email to the client
- A paid / unpaid / overdue list with what is due this week
- Quotes that turn into an invoice once accepted
How software agencies work
A software agency sells engineering time and outcomes: discovery workshops, fixed-scope builds, sprint-based development, maintenance retainers and developers placed inside client teams. Work comes from referrals, past clients and partnerships, and utilization is the number that makes or breaks the month. Most agencies juggle an issue tracker, time tracking, a proposal tool, spreadsheets for resourcing and a weekly status email. Software helps when clients can see progress without a meeting and the agency can see who is booked, what is billable and which projects are drifting.
What invoicing app for Software Agencies has to handle
- Invoices should support fixed-price milestones, time and materials, and monthly retainers.
- Time and materials invoices need hours by person or role with the agreed rates.
- Change requests should be billed as separate lines that reference the approved request.
- Purchase order numbers are often required by larger clients before an invoice is paid.
A tip for software agencies
Tie milestone invoices to objective deliverables, like a feature accepted in staging, rather than a date. Milestones based on dates cause disputes when the client is late with feedback; acceptance criteria make it clear when the invoice is due.
A prompt to start from
Build an invoicing app for a software agency. Keep a list of clients with client name, project and sprint. Create invoices with a number, date, due date, line items for custom builds, staff augmentation and maintenance retainers, quantity, rate, tax and total. Generate a printable PDF, mark invoices paid or overdue, and show a dashboard of outstanding money. Add quotes that can be converted into an invoice, and store everything in a database.
Questions
Can invoices include a client's purchase order number?
Yes. Ask for a PO number on each project, printed on every invoice, and the app can warn you if a project has none.
Can it produce a PDF?
Yes. Ask for a printable invoice and Mythex builds a clean PDF layout with your details, logo and numbering, which you can download or attach to an email.
Does it handle tax?
Say which tax applies and at what rate and it is calculated per line and shown in the total. If you bill in more than one currency, say that too.
Do I need to know how to code?
No. You describe what you want in plain language and Mythex writes the code, shows a live preview, and lets you change things by chatting. The code editor and terminal are there if you ever want them.
Do I have to explain my business every time?
No. Mythex remembers who you are and how you work across every project, and follows the standing notes you set for a project, so you are not re-briefing it in each new chat. You can read, edit or switch all of it off.
How much does it cost?
There is a Free plan with daily credits, enough to build and publish a first version. Pro is $25/month and adds full code editing, GitHub export, custom domains, and credit top-ups.
Templates to start from
- Agency Portfolio Template — Pricing calculator with booking
- Mortgage Calculator Template — Live amortization with PMI
- Finance Dashboard Template — Board-ready finance reporting
- Fintech Payments Site Template — Tiered pricing, blog, animations
- Plumbing Business Site Template — Quote calculator with lead dashboard
- Invoice Generator Template — Canvas invoicing with PDF export
- Expense Claims App Template — Receipt uploads with policy checks
- Sales ROI Calculator Template — Three-scenario models and branded PDFs
Guide
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