Open-source finance tools
Practical tools for finance teams inside billing, AR, and revenue ops.
A JustPaid toolbox for operators who need concrete outputs: collections copy, AR prioritization, runway planning, SaaS metrics, and AI finance playbooks.
Built as useful entry points into the JustPaid operating system for revenue work.
Each tool maps to a workflow finance teams already run manually in spreadsheets, inboxes, or billing systems.
Tools directory
Seven finance tools to speed up weekly revenue work
Built for finance folks who need usable outputs quickly, not another dashboard to babysit.
Accounts receivable
Dunning Email Generator
Generate a complete payment reminder sequence with tone, escalation timing, payment context, and copy-ready email drafts.
Use before sending overdue invoice follow-up.
Output
Collections operations
AR Aging Analyzer
Segment open invoices by age, balance size, customer risk, and next best action so finance can prioritize collection work.
Use when a controller needs a cleaner Monday collections queue.
Output
Cash planning
Cash Runway Calculator
Model cash runway from starting cash, burn, expected collections, payroll, vendor payments, and near-term obligations.
Use before founder, board, or finance standups.
Output
Revenue operations
DSO Calculator
Input revenue and AR balance, get Days Sales Outstanding with benchmarks by industry.
Use to track DSO and identify accounts receivable risk.
Output
Revenue analytics
SaaS Metrics Calculator
Calculate ARR, MRR, net revenue retention, gross churn, expansion, and invoice collection health in one finance view.
Use when updating investor metrics or monthly finance reporting.
Output
Billing operations
Invoice Dispute Response Generator
Create a professional response when a customer blocks payment because of a PO, contract, tax, or invoice issue.
Use when AP disputes an invoice and finance needs a clean next step.
Output
AI finance agents
Finance Skills Library
Open-source JustPaid playbooks for AI agents working on billing, reconciliation, usage billing, AR, and close workflows.
Use to standardize finance agent work across billing operations.
Output
Revenue operations
Revenue Leak Audit Tool
Find leakage from unbilled usage, failed payments, discounts, credits, and manual billing gaps before month-end.
Use before month-end close or weekly revenue operations review.
Output
Operating philosophy
Tools should finish finance work, not just visualize it.
Small tools that produce a usable finance artifact in minutes.
Open-source defaults so teams can inspect, adapt, and extend the workflow.
Designed around billing, collections, and revenue operations work JustPaid already automates.
Have a workflow request?
Tell us which finance spreadsheet you want to replace next.
We are turning repetitive revenue operations work into simple tools and open-source playbooks finance teams can adapt.