The B2B marketing agency that doesn't wait for the phone to ring.
Free audit. You keep the report either way.
- We fix your site so visits turn into leads.
- You show up on Google and in AI answers.
- Your content lands where buyers already scroll.
- We build the list, warmest data first.
- We send 5,000+ cold emails a month.
- LinkedIn DMs back up every email.
LinkedIn acceptance rate
LinkedIn reply rate
cold emails sent a month
first-page keyword rankings
YOY website traffic growth
more leads in 6 months
Client results across UnderdogOS
- The problem
You hired four vendors. You got four reports.
You’re too big to ignore marketing and too small to hire a department for it. So you piece it together. A web guy here. An SEO shop there. Each one needs managing. None of them talk. And none of them do outbound, so you wait for buyers to find you.
SEO shop: Your monthly report is attached.
Web guy: Can we push that update to next week?
Outbound: Nobody’s doing it.
Meanwhile, your buyers hear from someone else.
Every month you wait, your next client signs with a competitor. Not because they're better. Because they showed up first.
- Inside UnderdogOS
Inbound gets you found. Outbound gets you in the door.
That’s the B2B secret most agencies skip. UnderdogOS runs both, plus the content that ties them together. All three included for $1,995/month.
Cold Outreach.
5,000+ cold emails a month on multi-mailbox infrastructure, plus LinkedIn DMs. Lists and copy included.
Website.
CRO, SEO and AEO. Your site turns visits into leads, ranks on Google and shows up in AI answers.
Thought Leadership.
Content and social media on the platforms where your ideal customers already spend time.
Why not do it yourself?
It only works if it runs every day. Most teams start strong, get busy and stop. We built multiple seven-figure businesses on this system, and we keep up with every change so you don’t have to.
- Cold Outreach
The half most agencies skip.
Warmest data first.
We start with the people closest to a yes, then work outward.
A list built for you.
Real buyers who look like your best clients. No bought lists.
Email at scale.
5,000+ cold emails a month across multiple mailboxes, built to land in the inbox.
Copy a human wrote.
American copywriters write every email and DM. You approve it before it sends.
- Proof
Real results. Real replies.
- Case study · Cold email · Youth sports software
108 real replies from 1,010 youth football organizations
A youth sports software company sells registration software to youth sports groups. We wrote a short cold email sequence. One clear ask.
Saleshandy data, January 12 to July 15, 2026. Real replies leave out auto-replies. Positive means interested, meeting booked or closed. Our average real reply rate across every sequence: 2.52%.
organizations contacted
real replies (10.69% reply rate)
positive replies (5.15%)
"Underdog Digital has been instrumental in helping us scale our marketing efforts. They've built effective cold email campaigns, improved our website, and created customized solutions tailored to our business."
- UnderdogOS client · Google review
- From our Google reviews
★★★★★
“They’ve played a major role in helping my payroll firm grow and scale, and I couldn’t be happier with the results.”
Google review
★★★★★
“We continue to see steady growth in followers, many of whom have ultimately turned into prospects and, more importantly, clients.”
Google review
★★★★★
“The team at Underdog simply delivers. If you want the best marketing bang around – look no further. Mission + team = results. They have it all.”
Google review
- Your options
Four ways to grow. Only one runs both halves.
| Do it yourself | In-house hire | A patchwork of vendors | UnderdogOS | |
|---|---|---|---|---|
| Website (CRO, SEO, AEO) | When you have time | If you hire for it | One vendor | Included |
| Content where buyers are | Nights and weekends | Your hire | Another vendor | Included |
| Cold email and LinkedIn | More work for you | If they know how | Usually skipped | 5,000+ emails a month, plus DMs |
| Who writes it | You | Your hire | Templates | American copywriters. You approve it. |
| Runs every day | Until you get busy | Until they leave | Depends who you ask | Every day, for years |
| What you pay | Tools plus your time | Salary, benefits and management | Several retainers | $1,995/month |
- How it starts
Three steps. Then we run it.
Get your free audit.
We look at your site, your outreach and your content.
Get your plan.
You keep the report whether you hire us or not. If it’s a fit, we start with your warmest data.
We run it.
Website and content work starts right away. New mailboxes warm up for 2 to 4 weeks, then outreach goes live.
- FAQ
B2B marketing questions, answered
By Matt Vaadi, Founder, Underdog Digital · Updated October 2026
What does a B2B marketing agency do?
Can't I just do all this myself with ChatGPT?
You can try. AI gives you exactly what you ask for, and that’s the problem. If you don’t know what good copy, a converting page or a cold email that gets replies looks like, you can’t prompt for it, and you won’t spot the mediocre stuff it hands back. We use AI every day too. What you’re paying for is knowing what good looks like and running the system until it brings in leads.
How much does UnderdogOS cost?
UnderdogOS is $1,995/month with all three pillars included: Cold Outreach, Website and Thought Leadership. Want ads too? UnderdogOS+ is $2,995/month. See our pricing page.
Why do inbound and outbound work better together?
Inbound catches buyers who are already looking. Outbound reaches the ones who aren’t looking yet, which is most of them. When a cold email lands, the buyer checks your site. That site has to close.
Should I hire an agency or do marketing in-house?
Who writes the cold emails and LinkedIn messages?
American copywriters on the Underdog Digital team write every cold email and LinkedIn message. Short, in your voice, one clear ask. You approve it before it sends. Our LinkedIn outreach runs at a 33.5% acceptance rate and a 12.3% reply rate.
What is AEO?
AEO stands for answer engine optimization. It’s how your business shows up when buyers ask ChatGPT or Google’s AI answers for a recommendation. It’s part of the UnderdogOS Website pillar.
How long does it take to see results?
Outbound moves first. New mailboxes warm up for 2 to 4 weeks, and replies can start as soon as sending does. SEO and content compound over months. We don’t promise a timeline, but we start with your warmest data to get early wins.
Who is UnderdogOS for?
UnderdogOS is for small and mid-sized B2B companies tired of waiting on referrals and inbound alone. That includes payroll bureaus, PEOs, HR firms, software companies and other professional services teams. Run a payroll firm or a CPA firm? See our pages for payroll companies and CPA firms.
- Your move
Stop waiting for the phone to ring.
Get your free audit. We look at your site, your outreach and your content, and you keep the report either way.