Before looking at any number, it helps to understand what you're actually buying. SEO isn't a single deliverable — it's a combination of technical infrastructure work, content production, and authority building (link acquisition). Each of those has its own cost driver.
Technical SEO
This covers site architecture, crawlability, Core Web Vitals, schema markup, and indexation hygiene. For most early-stage startups on modern stacks (Webflow, Next.js, or similar), the foundational work is a one-time investment that gets maintained over time. Expect this to front-load cost in months one through three.
Content Production
This is usually the largest ongoing cost. For SaaS and B2B tech startups, content means bottom-of-funnel comparison pages, integration pages, use-case landing pages, and supporting blog content. Quality matters more than volume here. A single well-researched, conversion-optimized article on a high-intent keyword is worth more than ten thin posts.
Link Acquisition
Domain authority doesn't build itself. In competitive SaaS categories — project management, CRM, fintech, developer tools — the established players have years of compounding backlinks. Closing that gap requires consistent, editorial-quality link building. This is often where low-budget engagements fall short: they skip link acquisition entirely and wonder why rankings stall.
The mix of these three activities shifts by stage. Early on, technical and foundational content dominate. By Series A, content volume and link acquisition take over. At growth stage, you're optimizing an existing engine rather than building from scratch.
One more factor: your competitive set. A B2B niche with low search competition (say, a vertical SaaS for funeral homes) requires a fraction of the budget needed to compete for terms like "project management software" or "payroll platform." Before benchmarking against any pricing guide, map your actual keyword competition first.