Cohortagency

Retainer-based creative and marketing agencies often coordinate sales, agreements, requests, delivery, time context and billing across separate systems. The supplied research confirms a large professional-services automation category, recent investment and upmarket movement among enterprise-oriented vendors, and generic project tools without a first-class retainer ledger. It suggests an opening for agencies with roughly five to fifty people, but it does not prove the proposed flat-fee model, the cited segment boundary or a durable absence of competitors. One referenced interface was unverified.

A retainer is not a bucket of interchangeable hours. Agreements can define recurring capacity, deliverables, service categories, rollover, expiration, priority, exclusions, response expectations and approval rules. A client request is not accepted scope; an estimate is not consumed value; time is evidence, not necessarily the billing unit. A scope decision, delivered artifact, client approval, invoice draft, issued invoice, payment and revenue recognition are separate. Amendments must preserve the contract version that governed each decision.

Lead, client, agreement, agreement version, retainer period, entitlement, request, scope assessment, estimate, approval, allocation, work item, time observation, deliverable, acceptance, rollover, overage candidate, change order, invoice draft, issued invoice, payment event, correction and close are distinct. Cohortagency should give agency leaders a trustworthy retainer ledger while preserving client approval, accounting authority and delivery judgment.

An owner, operations leader or finance lead at a five-to-fifty-person creative, marketing or branding agency whose recurring client work is governed by retainers and scope rather than pure time-and-materials billing.