SaaS companies buying SEO fall into one of three models, and the price difference between them is significant enough to shape your decision before you compare individual vendors.
Agency Retainer
A dedicated SEO agency handles strategy, technical audits, content production, and link building under a monthly retainer. This is the fastest path to full-program execution, especially for companies without internal SEO expertise. Typical range: $3,000–$15,000/month, with scope determining where you land. A seed-stage SaaS targeting long-tail educational terms sits closer to $3,000–$5,000. A Series B company targeting high-competition category terms alongside competitors with mature content libraries will typically invest $8,000–$15,000 or more.
In-House SEO Hire
Hiring a dedicated SEO manager appears cheaper at a glance — a mid-level SEO hire costs $75,000–$110,000 annually in most U.S. markets. But factor in employer taxes, benefits, tooling (Ahrefs, Screaming Frog, Surfer, ClearScope, and similar run $500–$1,200/month combined), and the 60–90 day ramp period before meaningful output begins. The true annual cost of an in-house SEO hire is typically $110,000–$145,000 when fully loaded, and that assumes a single hire can cover technical SEO, content strategy, and link building — a broad ask.
Hybrid Model
Many growth-stage SaaS companies settle here: one in-house SEO lead who owns strategy and content direction, paired with an agency or specialist contractors for technical execution and link acquisition. This often produces the best output-per-dollar ratio once your organic program is past the initial setup phase. Typical hybrid investment: $6,000–$12,000/month when you combine the in-house salary allocation with agency or contractor costs.
Choosing between these models comes down to your current stage, internal bandwidth, and how quickly you need results — not just the monthly number on the invoice.