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Best case study writing agencies (2026): written and video customer stories for B2B

Case study writing agencies interview your customers and turn what they say into written customer stories, video testimonials, sales slides, and quote cards. For a B2B company, a good case study is the proof that closes deals: a named customer, a specific problem, and a number that moved.

Below are the agencies that write and film B2B case studies, plus the software teams use to collect proof themselves, with what each publishes about price. OneGTM is not a case study agency. We include a section on what a strong B2B case study contains, using our own numbers-led example.

By Garrett Wolfe, founder of OneGTM (Clay Artisan Solutions Partner) and former GTM engineer at Unify. Updated .

Key takeaways

  • A done-for-you written case study runs about $2,500 to $4,400 at the agencies that publish prices.
  • Video customer stories cost more, from about $5,750 per story at Testimonial Hero.
  • Software such as UserEvidence, Vocal Video, Senja, and Testimonial collects proof at scale for far less per story.
  • The best case studies lead with one hard number, a before and after, and the customer's own words.
  • Getting the customer to agree is the hardest step. Ask right after a measurable win.

Written case study agencies

These run the customer interview and deliver a finished written story, often with a one-pager, a sales slide, and quote cards. Expect four to six weeks from the customer introduction to the final draft.

Testimonial Hero

Customer proof agency, part of Storysnap, producing remote and on-site video stories plus written case studies, one-pagers, sales slides, and quote cards. Case Study Buddy's domain now redirects here.

Best for: Teams that want written and video from one vendor

Pricing: Written case studies from $2,530 (AI-assisted) or $3,450 (human-written); full written bundles $3,450 and $4,370. Video stories from $5,750 remote, $9,487 on-site, each with a written case study; bundles save up to 25%.

Uplift Content

Content writing agency for B2B SaaS that writes case studies, white papers, ebooks, and blog posts. Runs an annual study of 100+ B2B SaaS case studies. No long-term contract required.

Best for: SaaS teams that want case studies and other long-form content from one writer team

Pricing: Custom retainers; month to month.

SaaSpirin

Small, fully remote done-for-you case study service. You introduce the customer and they handle outreach, the interview, a written story of 1,000 to 1,500 words, an edited video, sales slides, and quote cards.

Best for: Early-stage SaaS teams wanting video and written for one fixed price

Pricing: $2,499 for one customer case study (video, written story, slides, quote cards). A subscription option is also listed.

Video customer story agencies

Video stories work on the homepage, in ads, and in sales follow-ups, where a buyer will watch 90 seconds of a peer before reading 1,500 words. They cost more and need more of the customer's time.

The Customer Story

Unscripted customer testimonial films with cutdowns for ads, social, and sales, plus remote stories shot on the customer's phone or webcam. Clients include Dell, Rackspace, and Epicor.

Best for: Polished hero films for larger brands

Pricing: Custom pricing; flat quote per project.

Represent Studio

Video agency for B2B software and tech companies producing customer testimonials, launch videos, product tutorials, and long-form YouTube.

Best for: SaaS teams that want testimonials and product video from one studio

Pricing: Custom pricing; discovery call.

Customer proof software

These tools collect quotes, survey stats, and video testimonials from many customers at once, then turn them into short stories, widgets, and libraries. Use them when you need lots of proof cheaply, and an agency for the few flagship stories.

UserEvidence

Customer evidence platform that surveys customers across the lifecycle and turns the answers into quotes, ROI stats, and short case studies in a searchable library for sales.

Best for: B2B teams that need verified proof stats at scale

Pricing: Pricing not published; contact sales.

Vocal Video

Video testimonial platform. Customers record from a browser link, and the software edits the clips into branded videos with captions and music for galleries and embeds.

Best for: Collecting many short video testimonials without a film crew

Pricing: Free plan with watermark; paid plans from $99 per month billed annually; Enterprise custom.

Senja

Social proof tool that collects and imports text and video testimonials, then turns them into widgets, walls of love, images, and AI-generated case studies.

Best for: Small teams that want testimonials and quick case studies cheaply

Pricing: Free for 15 testimonials; Starter $29 per month; Pro $59 per month. Yearly billing gives 2 months free.

Testimonial

Collects text and video testimonials through a shareable page and displays them in embeddable walls and widgets.

Best for: Collecting video testimonials on a budget

Pricing: Free; Starter $25 per month; Ultimate $50 and Ultimate+ $95 per month per space; Enterprise custom.

SlapFive

Customer advocacy platform that tracks advocates, automates reference requests and referrals, and produces surveys, stories, and testimonials, with case study writing offered as a service.

Best for: Teams running references and advocacy alongside case studies

Pricing: Pricing not published; book a demo.

Prices are from each vendor's site as of October 2026 and change often, so check before you buy. This is an opinionated list, not a paid ranking. Some links are referral links that may earn us a credit; that never changes what you pay or who makes the list.

Case study writing agencies and tools compared

ToolBest forStarting price
Testimonial HeroTeams that want written and video from one vendorFrom $2,530/written story
Uplift ContentSaaS teams that want case studies and other long-form content from one writer teamCustom retainers
SaaSpirinEarly-stage SaaS teams wanting video and written for one fixed price$2,499/case study
The Customer StoryPolished hero films for larger brandsCustom pricing
Represent StudioSaaS teams that want testimonials and product video from one studioCustom pricing
UserEvidenceB2B teams that need verified proof stats at scaleContact sales
Vocal VideoCollecting many short video testimonials without a film crewFree; from $99/month billed annually
SenjaSmall teams that want testimonials and quick case studies cheaplyFree; Starter $29/month
TestimonialCollecting video testimonials on a budgetFree; Starter $25/month
SlapFiveTeams running references and advocacy alongside case studiesContact sales

Starting prices as published by each vendor in October 2026.

What a good B2B case study contains

A buyer reads a case study to answer one question: did this work for a company like mine? Lead with the result. Put the number in the headline, then explain the starting point, what changed, and how long it took. Quote the customer in their own words, and name the company and the person if they will let you.

OneGTM's Coastal Recruiting case study is an example of a numbers-led one: accepted candidate intros went from 72 to 340 a month, a 4.7x increase, between April and August 2026. The headline number, the baseline, the time frame, and what we built all sit at the top of the page.

  • One hard number in the headline, with the baseline it grew from.
  • A time frame, so the reader knows how long it took.
  • The customer's situation before, in enough detail that a peer recognizes it.
  • What was built or changed, in plain terms.
  • Direct quotes from a named person at the customer.
  • A short summary block a sales rep can paste into an email.

Agency or software

Hire an agency for the three to five flagship stories your sales team will send every week. The interview is a skill, and a good interviewer gets the quote and the number your own team would miss.

Use software for volume. UserEvidence, Vocal Video, Senja, and Testimonial collect proof from dozens of customers for less than the cost of one agency story. Many teams run both: software for breadth, an agency for depth.

Getting customers to agree to a case study

The hardest part of a case study is the customer's approval. Ask right after a measurable win, when the champion is proud of the result and wants credit for it internally.

  • Frame it as a story about the champion's win, with their name and photo.
  • Offer an anonymized version if legal will not approve the logo.
  • Keep the ask to one 30 to 45 minute interview, and do the writing yourself.
  • Give them approval over the final draft.
  • Offer something back: a backlink, a feature in your newsletter, or a speaking slot.

When to get help putting case studies to work

A case study sitting on your website does little. It earns its cost when it shows up in outbound, matched to the prospect's industry and problem, at the right step in the sequence.

OneGTM builds outbound systems that pull the right proof into each email and LinkedIn message by segment. We do not write case studies, but we make sure the ones you have get used.

  • You have case studies but reps rarely send them.
  • Every prospect gets the same proof point regardless of industry.
  • You want outbound copy built around your best customer numbers.
  • You are deciding which customer stories to commission first.

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Case study writing agencies FAQ

What are the best case study writing agencies for B2B?
Testimonial Hero produces both written and video B2B case studies and publishes its prices. Uplift Content writes case studies for B2B SaaS companies. SaaSpirin offers a fixed-price done-for-you package. For video, The Customer Story and Represent Studio are options. UserEvidence and Vocal Video are software alternatives.
How much does a B2B case study cost?
A written case study from an agency costs about $2,500 to $4,400. Testimonial Hero charges from $2,530 for an AI-assisted written story and $3,450 for a human-written one, and SaaSpirin charges $2,499 including video. Video customer stories start around $5,750 at Testimonial Hero. Freelance writers often charge less.
What should a B2B case study include?
A headline with one hard number, the baseline it grew from, the time frame, the customer's situation before, what was built or changed, and direct quotes from a named person. OneGTM's Coastal Recruiting case study leads with a 4.7x increase in accepted candidate intros, from 72 to 340 a month between April and August 2026.
Should I make a written or a video case study?
Do both if you can. Video works on the homepage, in ads, and in sales follow-ups. Written stories rank in search, get quoted by AI assistants, and are easier to skim. Testimonial Hero and SaaSpirin bundle a written story with each video.
How long does it take to produce a case study?
Usually four to six weeks from the customer introduction to the final version. Most of that time goes to scheduling the interview and getting the customer's approval, which is why agencies ask you to make the introduction first.
What is the difference between a case study agency and customer evidence software?
An agency interviews a few customers in depth and writes or films a polished story. Customer evidence software such as UserEvidence, Vocal Video, or Senja collects quotes, stats, and short videos from many customers at once. Agencies cost more per story; software gives you more proof for less.
How do I use case studies in outbound?
Match the story to the prospect. Send a case study from the same industry or with the same problem, quote the headline number in one line of the email, and link the full story. Rotating proof points by segment usually beats sending the same case study to everyone.

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