Accounting & Invoicing

Cloud accounting platform from Intuit covering invoicing, bank reconciliation, expense tracking, and financial reporting for small US businesses.

The US benchmark for solo-firm accounting -- bank feeds, 100+ integrations, and a REST API make it the safest default; budget for Plus ($115/mo) if you need per-project profitability tracking, since Simple Start ($38/mo) caps you at one user with no project reporting.

General-purpose time-tracking and invoicing tool, not architecture-specific, that many small firms use to bill clients and track project profitability.

Covers the invoicing half of practice accounting -- Harvest generates invoices from tracked time with Stripe and PayPal payment collection; it is not a full bookkeeping system and needs a QBO or Xero integration to produce tax-ready records.

Cloud accounting and invoicing platform for freelancers and service businesses, with built-in time tracking, retainer billing, and project profitability reports.

Purpose-built for freelance project billing -- built-in time tracking, retainer invoicing (Plus, $43/mo), and proposals map directly to the sole-prop A/E workflow; the 5-client cap on the $23/mo Lite plan forces an upgrade once your active client roster grows past a handful.

Cloud accounting platform with bank reconciliation, invoicing, multi-currency support, and 1,000+ marketplace integrations for small businesses worldwide.

Strong QBO alternative with a deeper API ecosystem and better multi-currency support -- the $20/mo Starter plan is capped at 20 invoices/month, making the $47/mo Standard plan the practical entry for any A/E sole prop billing more than a handful of projects at once.

Firm management software that combines project budgeting, time tracking, staff planning, and invoicing built specifically for architecture and engineering practices.

Built-in invoicing makes Monograph a light two-in-one -- fee and invoice management are native to the platform, so a solo architect can skip a separate accounting tool for basic project billing; it is not a substitute for full bookkeeping or tax-ready P&L reporting.

All-in-one freelancer business platform with contracts, invoicing, time tracking, expense management, and a CRM, with an MCP server for AI agent integration.

The best contract-to-invoice-to-expense bundle for a sole-prop A/E: Essentials ($25/mo) covers contracts with e-signatures, time-tracked invoicing, expense logging, and a client portal in one plan; the MCP server (beta) gives it the most credible agent-automation story of any tool in this category.

All-in-one platform for project accounting, billing, time tracking, and resource planning built by and for architecture and engineering firms.

A genuine practice accounting tool, not just billing -- BQE CORE handles project accounting, WIP tracking, and revenue recognition alongside time and invoicing; the depth is overkill for a solo firm with one or two active projects at any given time.

Free cloud accounting and invoicing platform for freelancers, owned by H&R Block since 2019, with automated bank reconciliation on the $19/mo Pro plan.

The zero-cost entry point for a solo architect setting up business finances -- free unlimited invoicing and expense tracking covers early-stage needs; upgrade to Pro ($19/mo) for automated bank reconciliation; plan to graduate to FreshBooks or QBO once billing complexity grows beyond basic invoicing.

Client management platform for service businesses with contracts, invoicing, CRM, scheduling, and client portal, with AI-assisted email drafts and meeting notes added in 2024.

Polished client portal and contract workflow for fixed-fee-only solo practices -- the February 2025 price jump to $36/mo Starter (up 89.5% from $19), no built-in time tracking, and a creative-business UX skew make it a poor value for an engineer billing hourly or a multi-project architect.