How to Verify an SEO Agency's Track Record
Case studies and testimonials are marketing materials, not evidence. Here's a practical process for independently verifying whether an SEO agency actually delivers results.
Every SEO agency has case studies. Every agency has testimonials. Most are hand-picked. And none can be checked on their own from the agency's website. To verify SEO agency track record claims, start by reading them with care. A case study showing "300% traffic increase" tells you almost nothing. What traffic? Over what period? From what baseline? And did that traffic turn into anything commercially useful?
Verifying an agency's record means going past their marketing. Here is a process that actually works.
Step one: ask for specific, verifiable client references
Ask the agency for two or three clients you can speak with directly. Current or former both work. Ideally pick ones in a similar industry or market to yours. Any real agency can do this. If they stall, or offer written quotes instead of a live call, that is a serious warning sign.
When you speak to references, ask three things. How long have you worked with them? What metrics moved? And what do they do that you could not do yourself?
Ask the reference if results were tied to revenue, not just traffic. Traffic gains mean little without business outcomes.
Ask if they had to clean up technical or link issues caused by the agency. This question often surfaces problems that polished case studies leave out.
Step two: independently audit their own organic presence
An agency that cannot rank its own website is a real red flag. Use the free tools from Ahrefs, SEMrush, or Moz to check the agency's own domain. What is their estimated organic traffic? How many keywords do they rank for? What does their backlink profile look like? An agency with thin organic presence, low domain authority, or a spammy link profile should not manage yours.
This test is not foolproof. A B2B agency may win leads through relationships, not search. But it still shows whether they practice what they sell. Most strong agencies rank well for their own target terms.
Step three: request real data, not screenshot PDFs
Ask the agency to share real Google Search Console or Analytics data, with client permission. Use a comparable client engagement. Screenshots can be edited. Live read-only access, or a shared export, is much harder to fake. Look at:
Impression and click trends over 12+ months, not a single peak period.
Which keywords drove movement. Were they meaningful commercial terms or high-volume vanity terms?
Whether ranking gains held, or spiked and dropped. A spike and drop often points to manipulative tactics.
The most reliable check is a client reference call. The client describes a problem that got solved. That beats a marketing quote about how great the agency is.
Step four: check for red flags in their own marketing
How an agency markets itself tells you a lot about how it works. Watch for these. Guarantees of specific rankings or traffic numbers, which no ethical provider makes. Vague process descriptions that could mean anything. Language fixed on activity, like "we publish X articles" or "we build X links," instead of outcomes. And case studies with no client names or industries.
Also read how to avoid scam SEO agencies for specific red flags beyond the track-record question, and should you trust SEO companies that guarantee rankings for a direct look at that specific tactic. See also: how to choose an SEO agency.
Step five: look at their client retention
Ask the agency how long their average client engagement lasts. An agency whose clients leave after three or four months is telling you something. Either expectations are not being met, or the work is not getting results. Agencies with genuine records tend to keep clients for years. SEO compounds, and clients who see results keep investing.
What if an agency won't share references or data?
Walk away. Results here are objectively measurable in Google Search Console data. Any client can export and share it. So refusal to show evidence of outcomes is the clearest possible sign that outcomes do not exist.
How do I evaluate a new agency with limited track record?
Look at the individual practitioners. Check their years of experience. Check their public writing. Do they have published work on Moz, Search Engine Land, or elsewhere that shows real expertise? And note how specific they get in your strategy talk. A new agency built by experienced people is a different risk than one built by people new to SEO.
Sources
Ahrefs - tools for auditing agency and client domain authority. ahrefs.com
Moz - on evaluating SEO providers and avoiding bad actors. moz.com
Search Engine Land - industry standards for SEO transparency and reporting. searchengineland.com
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Book a free Brand and Tech Assessment to see exactly how we would grow your organic visibility.
The Through The Glass Creatives Difference
There is a reason brands choose Through The Glass Creatives for work like this. It is led by Ravve Jay Prevendido, the creative director behind OWWA, Nuvia, and 100+ brands. Mherie Vic Palomo-Prevendido leads growth and brand strategy. TTGC builds a managed system that compounds. It is not a one-off project or a ticket queue. When the outcome genuinely matters, the TTGC team is built to be trusted with it. Book your free Brand and Growth Assessment.
