SolidInvoice vs WorkflowMAX

SolidInvoice is invoicing software for creating recurring invoices, accepting online payments, sending payment reminders, and billing in multiple currencies. It runs on the web, Linux, and macOS. The hosted Solo plan is $9 a month and includes 10 active clients, unlimited invoices, one seat, online payments, recurring invoices, and multi-currency support. Pro is $19 a month, with unlimited clients and invoices, three seats, automated reminders, custom branding, and REST API and MCP Server access. Business costs $39 a month and includes 10 team seats, invoice and quote templates, a custom domain, and dedicated support. A self-hosted plan is listed at free, under the MIT license, for running on your own server with no per-client limits. The pricing note lists a free plan, paid plans from $9/mo, and a 14-day trial. SolidInvoice’s maker was founded in 2013.

WorkflowMAX is a job profitability operating system for professional services firms. It covers quoting, job management, scheduling, time tracking, work-in-progress management, and invoicing. A job record can contain tasks, costs, time, and documents, while timesheets record time against jobs and tasks through eight entry methods. The service supports recurring invoices, online payments, and multi-currency invoicing. Integrations include Xero, QuickBooks, HubSpot, Zapier, Airwallex, and Google Calendar, with MCP connections described for Claude, ChatGPT, Gemini, and Microsoft Copilot. Dedicated iOS and Android apps support job management, time entry, and task viewing; web and API access are also listed. Essentials costs $8.33 a month, billed monthly, for 3–25 users. Pro costs $15 a month from five users, and Advanced costs $25 a month from ten users. Annual rates are listed as 7.50, 13.50, and $22.50 per user per month respectively. All plans include a 14-day trial with full selected-plan access and no credit card. Anyone who signs in needs a licence.