SEO vs PPC

SEO vs PPC compares the two main ways to appear in search engines: earning unpaid organic rankings through search engine optimisation, or paying for ads through pay-per-click advertising such as Google Ads. Both target people who are actively searching, but they work very differently.

Written by Paul Hoda, SEO consultant since 2005. Last updated 8 November 2026.

How each one works

  • SEO improves your website so it ranks in the free, organic results. You do not pay for each click, but you invest time and money in content, technical work and links (see Organic Traffic).
  • PPC lets you bid on keywords so your ad appears above or below the organic results. You pay every time someone clicks, and the traffic stops as soon as the budget runs out.

SEO vs PPC: the main differences

  • Speed: PPC can bring traffic the same day. SEO usually takes months to build momentum.
  • Cost model: PPC costs rise with every click. SEO costs are mostly upfront and ongoing effort, while each extra click is free.
  • Longevity: PPC traffic ends when you stop paying. SEO results can last for years.
  • Trust: many searchers skip ads and prefer organic results.
  • Control: PPC gives precise control over messages, budgets and targeting. SEO depends on how Google ranks your page.
  • Space on the page: ads, AI Overviews and other SERP (Search Engine Results Page) features push organic results down, which can favour PPC for some commercial searches.

When PPC makes more sense

  • You need leads immediately, for example for a launch or a seasonal offer.
  • You are testing which keywords and messages convert before investing in SEO.
  • The search results for your main keywords are dominated by ads and shopping listings.
  • You are in a very competitive market where organic rankings will take a long time.

When SEO makes more sense

  • You want a sustainable source of leads without paying for every click.
  • Your customers research before buying, so helpful content can reach them early.
  • Click costs in your industry are high, as in legal, finance or healthcare.
  • You want to build brand authority and trust over time.

Using SEO and PPC together

The strongest approach for many businesses is a combination:

  1. Use PPC data to discover which keywords convert, then target them with SEO pages.
  2. Cover keywords with ads while organic rankings are still growing.
  3. Reduce ad spend on keywords where you already rank at the top organically.
  4. Use remarketing ads to bring back visitors who first found you through organic search.

How to compare the return

Compare the cost per lead or sale from each channel over at least 12 months, not one month. SEO usually looks expensive at first and cheap later, while PPC costs stay roughly constant. Set clear SEO KPIs and track conversions in Google Analytics 4 so you can judge both fairly. If you are weighing up the cost of SEO help, my guide to how much an SEO consultant costs gives typical UK prices.

Key Takeaways

  • PPC delivers immediate traffic; SEO builds lasting traffic.
  • PPC costs continue with every click; SEO costs are mostly upfront effort.
  • Use PPC for speed and testing, SEO for long-term value.
  • Combining both lets each channel inform the other.
  • Compare cost per lead over at least 12 months.

Related Terms

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