If you already run an ongoing content and SEO programme and you want case studies quietly folded into it, a broad agency is a sensible call. Animalz, Brafton, Siege Media and The Blogsmith are genuinely good at content. But if the one job you actually need done is proof, and you want it done brilliantly rather than adequately, that’s a different shopping trip. What sets Best Case Studio apart here is focus. Proof is all we do. At an agency, your case study is one line on a very long menu.
I run Best Case Studio, so you should know where my bias sits before you read another word. Everything I say about the agencies below comes from their own websites and from what’s publicly known about how they price and work. Where I’m estimating (agency pricing mostly isn’t published), I’ll flag it as an estimate. I’m not going to pretend these are bad companies, because they’re not.
Best Case Studio vs a content agency, side by side
| Best Case Studio | Broad content / SEO agency | |
|---|---|---|
| What you get back | Video case study, written case study, video testimonial, written testimonial, social pack, from one interview | A written case study (video usually a separate line item) |
| Price | $2,500, fixed, one bill | Bespoke, inside a retainer (est. $8,000–$15,000+/mo) |
| Case study as a specialism? | It’s the only thing we do | One service line among blogs, SEO, white papers, video |
| Turnaround | 14 days from the interview | Weeks, retainer-paced |
| Commitment | One-off, no lock-in | Retainer / ongoing programme |
| Built for | Founders who want proof handled | CMOs running a broad content operation |
Agency pricing there is an estimate, because almost none of them publish a flat rate for a single case study. That’s not me being cagey. It genuinely doesn’t exist as a public number, and there’s a reason for that which I’ll get to.
What a content agency is actually good at
Let me concede the real stuff, because it matters.
These agencies can write. Animalz built its name on premium B2B SaaS content and has worked with the likes of SupportLogic and Frontify. The Blogsmith does SEO-driven content with proper interviews and design, and has names like Klaviyo and Clearscope on its roster. Brafton and Siege Media run serious content operations with real distribution muscle behind them. This is not a “freelancer who googled a template” situation. The bench is deep and the craft is there.
The bigger point in their favour: if you’re already running a content programme, folding case studies into it is properly convenient. One partner. One invoice. One team who already knows your product, your voice and your buyer. Your case study slots into a wider strategy instead of floating on its own, and there’s real SEO and distribution expertise sitting right next to it. If your case study should rank and feed a content cluster and get repurposed across a campaign you’re already running, an agency that owns all of that is a coherent choice.
I’m not going to talk you out of that. If it describes you, some of you reading this should stop here and go brief your agency. Honestly.
Where the Proof Kit wins
Here’s the catch with “we do everything.” When a company does everything, no single thing is the thing.
At a broad agency, case studies are a service line. They sit below the blog engine and the SEO retainer on the priority list, because that’s where the recurring revenue and the strategic attention live. The senior strategist you met on the sales call is running the content calendar. Your case study gets written by whoever’s free that week, often off a template that’s been kicking around since 2021.
I know this because it’s how I started. The first case study I ever wrote was for a SaaS marketing agency that dropped it on my desk with almost no guidance. I had no framework, no interview training, no idea what a good one even looked like. I guessed my way through it. Was the result terrible? No, it was fine. Was it worth the $4,500 the client got billed for it? Absolutely not. That’s the model in one story: agency money, guessed-my-way-through output, because the case study was never anyone’s main job.
Proof is our main job. The only one. That focus buys you three things an agency structurally can’t match on this specific deliverable.
First, completeness from one conversation. You book a case study. You get a Proof Kit: a video case study, a written case study built to rank and get cited by AI, a video testimonial, a written pull-quote and a ready-to-post social pack. All harvested from one recorded interview. At an agency, video is nearly always a separate scope with a separate price. Buy each of those formats à la carte from separate vendors and you’re at $7,000–$10,000 across three or four bills. We do the lot for $2,500 because it all comes out of the same conversation.
Second, a fixed price for the one job that matters. No retainer. No “let’s scope it.” No committee. $2,500, you know it before you book, and it doesn’t move.
Third, speed. 14 days from the interview, because there’s no content calendar your case study is queuing behind. The clock starts the moment you’ve done the intro and the scheduling, and then it’s on us.
”But we want one partner for everything”
This is the objection, and it’s a fair one. The agency pitch is “we do everything, so you only manage one relationship.” Tidy. Appealing. And it’s exactly the weakness on proof specifically.
Breadth is a real strength for a rolling content operation. It’s a liability for the one deliverable that has to carry the most weight in your entire funnel. A case study is the thing a sceptical VP reads at the bottom of the funnel before they decide whether to trust you with money. That’s not the piece you want written by the person who happened to have a gap in their week.
Specialists beat generalists on the thing they specialise in. That’s just true. You wouldn’t hire your GP to do your knee surgery, even though your GP is a perfectly good doctor. The agency is your GP: broad, capable, the right call for most of what’s wrong with you. Proof is the knee surgery. I do knees.
So the honest version of the trade is this. You give up the convenience of one partner for all your content. In return you get depth, speed and a fixed price on the single deliverable that actually decides deals. For most founders weighing this up, that’s a trade worth making.
Who should pick which
Pick a content agency if you’re already running, or about to run, an ongoing content and SEO programme, and you have someone in-house (a CMO, a content lead) to manage the relationship. If case studies are one deliverable inside a broader strategy and you’d rather not add another vendor, a good agency is honestly the right home for them. Just make sure they treat case studies as a real methodology and not a bolt-on, and ask directly who’ll be writing yours.
Pick Best Case Studio if proof is the job. You’re a founder, you don’t have a content machine to plug this into, you don’t want a retainer, and you want the whole set (video and written, case study and testimonial, plus social) handled by people who do nothing else. You want to know the price up front and have it in your hands in two weeks.
There’s a maths angle worth checking too. I broke down what a case study actually costs at each tier, including the retainer arithmetic, in this pricing guide. If you’re staring at a $10k/month proposal and wondering what share of it is really the case study, read that first.
Judge the work, not the pitch
The easiest way to judge any of this is to look at the actual work, not the sales page. So go and look at a finished Proof Kit example and see what one interview turns into. If it’s the shape of proof you need, book a call or check the pricing. If it isn’t, and an agency programme is the better fit for where you’re at, brief them with my blessing.
Either way, don’t let the most important piece of proof you own get written as someone’s side project.