Ignition is a client engagement and proposals platform for accountants, bookkeepers, marketing agencies, and consultants who want to send branded proposals, automate engagement letters, collect signatures, and convert proposals into recurring billing. Marketed as proposal and engagement software for professional services, Ignition combines drag-and-drop proposal builders, e-signature collection, automatic recurring invoicing via Stripe, integrated payment collection, client portals, and accounting integrations with Xero, QuickBooks Online, and HubSpot. Ignition is a strong fit for accounting firms scaling client onboarding, marketing consultants productizing retainer engagements, and freelancers replacing manual contracts plus invoicing with a single proposal-to-payment flow.