“Sales-tech wizards”
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Trusted by top B2B businesses around the world
Our emails make it past spam and people are happy about it
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Check out the incredible results we’re getting
30+
Successful Clients
2m+
Emails Sent per Month
1:198
positive reply rate
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We’ve helped 40+ businesses never worry about sales again
"StackOptimise built the outbound system we needed to hit our growth goals."
"StackOptimise built the outbound system we needed to hit our growth goals."
Kieran Routledge
Field Sales Manager @ JRI Orthopaedics
Verified Client
"We are seeing awesome results from the StackOptimise managed outbound system."
"We are seeing awesome results from the StackOptimise managed outbound system."
Will Heylings
CRO @ Atom Learning
Verified Client
“We really struggled with email until StackOptimise helped us out."
“We really struggled with email until StackOptimise helped us out."
Lucy Ham
SDR Manager @ NetBase Quid
Verified Client
“You’re so different. I don’t see anyone doing your approach of lead generation for email... and it works”
“You’re so different. I don’t see anyone doing your approach of lead generation for email... and it works”
Mark Knops
CEO @ SketchLabs
Verified Client
“We’re getting great results... the guys are genuine experts. We’re getting 20-30 new qualified leads a month”
“We’re getting great results... the guys are genuine experts. We’re getting 20-30 new qualified leads a month”
Sam Gillingham
Co-Founder @ RocketPhone
Verified Client
“We’ve completely transformed our sales funnel in terms of volume of opportunity and where the opportunities are coming from. Cold email has consistently delivered around the clock with a consistent conversion rate. This is the most effective way that we’ve found of growing opportunities, growing the sales funnel... even in a super competitive market.”
“We’ve completely transformed our sales funnel in terms of volume of opportunity and where the opportunities are coming from. Cold email has consistently delivered around the clock with a consistent conversion rate. This is the most effective way that we’ve found of growing opportunities, growing the sales funnel... even in a super competitive market.”
Adam Jones
Chief Customer Officer @ BePro
Verified Client
“It’s gone absolutely turbo... we’re getting tons of high quality leads”
“It’s gone absolutely turbo... we’re getting tons of high quality leads”
Will Lovell
Co-Founder @ Lyra Studios
Verified Client
“Sales-tech wizards!”
“Sales-tech wizards!”
Ben Tolliday
Regional Director @ Multiverse
Verified Client
“The best month was 75 leads which we’re still gobsmacked about”
“The best month was 75 leads which we’re still gobsmacked about”
Will Mattey
Founder @ Inwan Studio
Verified Client
“Felix and Penn are absolute guns at outbound. They’re incredible marketing tacticians with serious tech skills. While everyone else is just recycling the same templates that stop working in a few weeks, these guys are the ones finding the new things that actually work. It’s been an absolute privilege working with them and I couldn’t recommend them more highly.”
“Felix and Penn are absolute guns at outbound. They’re incredible marketing tacticians with serious tech skills. While everyone else is just recycling the same templates that stop working in a few weeks, these guys are the ones finding the new things that actually work. It’s been an absolute privilege working with them and I couldn’t recommend them more highly.”
Tyce Hilton
Founder @ Landing Page Labs
Verified Client
“We’ve generated loads of leads from our ICP and they’ve been really good... some instant wins”
“We’ve generated loads of leads from our ICP and they’ve been really good... some instant wins”
Tom Anderson
CEO @ Hummingbird Agency
Verified Client
“We were successful in generating a number of leads”
“We were successful in generating a number of leads”
Sunny Rai
Head of CX @ Gyaan.ai
Verified Client
"Experts when it comes to sales-tech, automation and outbound systems"
"Experts when it comes to sales-tech, automation and outbound systems"
Sam Gillingham
Co-Founder @ RocketPhone
Verified Client
“ I’ve been blown away by the results. The team are very engaged. They use all the bleeding edge tools to make sure we’re sending high quality emails to the right people at the right time... More leads are coming every day... certainly recommend using StackOptimise”
“ I’ve been blown away by the results. The team are very engaged. They use all the bleeding edge tools to make sure we’re sending high quality emails to the right people at the right time... More leads are coming every day... certainly recommend using StackOptimise”
Mike Lee
Founder @ Outlier
Verified Client
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“We’d use previous cold email agencies and hadn’t been impressed with the results. Since working with Felix and the team we’ve consistently been getting leads and meetings booked in. Prospects respond with literally “good email let’s book in a call”.”
“We’d use previous cold email agencies and hadn’t been impressed with the results. Since working with Felix and the team we’ve consistently been getting leads and meetings booked in. Prospects respond with literally “good email let’s book in a call”.”
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Mike Heap
Founder @ MyAskAI
Verified Client
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“Our GTM process was really manual. StackOptimise helped us upgrade the whole process and have given us a nice steady stream of quality leads. We’ve been really impressed with the quality of the personalisation in the emails. They’re super easy to work with... can’t recommend them enough.”
“Our GTM process was really manual. StackOptimise helped us upgrade the whole process and have given us a nice steady stream of quality leads. We’ve been really impressed with the quality of the personalisation in the emails. They’re super easy to work with... can’t recommend them enough.”
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Matthew Harris
CRO @ Brandbassador
Verified Client
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In case you’re wondering how we’re different
Here’s how we compare...
Traditional Agencies
DIY/Inhouse
Lead magnet creation
150k enterprise tech stack
Certified Clay, Smartlead & GetSales experts
62% more positive replies than industry average
Insights from 5M+ emails
Mobile number generation
Rigorous a/b testing & campaign iteration
CRM integration
Run by sales veterans, with over 15 years combined experience
Dynamic client dashboards
Created by sales leaders to help grow sales
Most agencies start with good intentions but little actual sales experience and end up learning on your dollar. Not us. With a combined 15 years in the trenches, starting as SDRs, closing deals as AEs, and leading teams as Heads of Sales—we know what it takes to drive pipeline and hit ambitious growth goals.
After now sending 2.5M+ emails and driving £5.2M+ in pipeline, we’ve tested every tool, strategy, and workflow to create the automated outbound engine we wish we’d had. Backed by a top team of GTM engineers we take the guesswork out of outbound so you can scale with confidence.
After now sending 2.5M+ emails and driving £5.2M+ in pipeline, we’ve tested every tool, strategy, and workflow to create the automated outbound engine we wish we’d had. Backed by a top team of GTM engineers we take the guesswork out of outbound so you can scale with confidence.
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What are you waiting for? We’ll be a great fit if:
You’re ready to fill your calendar with high-quality meetings and focus on closing deals
You’re tired of generic outreach that doesn’t deliver and want an intent-driven approach powered by unique data
You want to scale outbound as a channel without increasing headcount
You want access to playbooks that are working right now for businesses like yours
You’re tired of spending money on expensive tools, ads and agencies without seeing results
You want to work with a team that genuinely cares, communicates, and works like an extension of your own