THIS ARTICLE IS FOR: All ListKit customers and anyone running cold email
Stage: Optimization
Owner: CS
Last updated: Aug 2026
TL;DR
Social proof is often the single biggest factor in whether a stranger decides to trust you
The strongest evidence reveals who the client is and states a specific, quantifiable result you got them
Most people who have great client results never collect them as proof simply because they never asked
If you do not have client case studies yet, you can still build credibility by documenting everything you know about your process in one place
There is no such thing as having too much evidence, every case study you add increases your close rate
Why this matters / When you'd use this
Your claim and your guarantee (see the previous two articles in this series) only get a prospect to consider you. Evidence is what actually convinces them you can deliver. Of the three things a prospect processes in a cold email, claim, guarantee, evidence, evidence is consistently the one that does the most work in closing the deal.
This article covers what makes evidence actually persuasive and what to do if you do not have much of it yet.
What makes evidence convincing
Not all social proof carries equal weight. The strongest evidence does two specific things:
Reveals who the client is: a named business or a real, identifiable person, not an anonymous quote
States a direct, quantifiable result: an actual number tied to what changed for them
Ranked roughly from most to least convincing:
An interview where the client reveals their business and the specific result they got working with you
A video testimonial where the client explains their business and outcome directly
A screenshot of the actual result, a dashboard, a message, a report
Vague, anonymous praise ("great to work with, highly recommend") does very little compared to a specific number attached to a named business.
You almost certainly have more evidence than you are using
Most people who deliver genuinely strong results for clients never turn those results into proof, not because clients refuse, but because they never ask. In most cases, when you ask a happy client for a quick case study or testimonial, they say yes.
A simple way to ask: explain that you are trying to gather a few case studies and ask if they would be open to a short conversation about the results you delivered for them.
If a specific client is not willing to do this, you do not need to abandon the case study entirely. You can still document the result yourself, describe what was done and what happened, using whatever data you do have, and turn that into a short presentation or video, without needing the client's direct participation.
If you do not have case studies yet
Early on, before you have enough client results to lean on, you can still build credibility a different way: by documenting everything you know about your process, your reasoning, and your approach in as much depth as possible.
The idea is straightforward, if you clearly demonstrate genuine depth of knowledge about a topic, most people will assume you know what you are doing, even before you have a long track record to point to.
To do this well:
Include real examples, even ones from your research rather than your own direct work, clearly labeled as such
Use visuals or diagrams wherever they make something easier to understand
Answer the obvious follow-up questions a reader would have at each point, rather than leaving gaps
Treat it as something you keep adding to over time, not a document you finish once
This will never fully replace real client evidence, but it buys you credibility while you are still building up your first results.
There is no such thing as too much evidence
Every additional case study, every additional testimonial, incrementally increases how many prospects convert. This does not level off the way most other efforts do, there is no point where you have "enough" proof. If collecting and publishing results is not already a standing part of how you run your business, it is worth making it one.
Expected outcome
Consistently asking for and publishing evidence, even just screenshots or short client interviews, should visibly increase how many cold prospects convert into calls and how many calls convert into clients. If you do not yet have that evidence, a well-documented breakdown of your own process and thinking can carry some of that weight in the meantime.
Frequently asked questions
What if my results are not impressive enough to be a case study yet?
Even a modest, honestly reported result is more persuasive than no evidence at all. A specific small number is still more convincing than a vague claim with nothing behind it.
How often should I be asking clients for case studies?
Any time you deliver a result worth mentioning. It should be a routine part of wrapping up work with a client, not something you do occasionally when you remember.
Can I use evidence from before I had a formal business, or from a different offer?
Yes, as long as it is honestly labeled for what it is. Relevant proof of competence still counts even if it came from a different context, as long as you are not misrepresenting where it came from.