Turn your data into answers you can act on
Marketing effectiveness, data infrastructure and custom projects.
The expertise of a big agency team, the transparency and flexibility of a startup
Different problems. The same need for clarity.
Your channels all claim the credit. You can't tell which one earned it.
Your channels all claim the credit. You can’t tell which one earned it.
Measure your real marketing ROI per channel; know where to spend more and where to stop.
MMM, incrementality testing and attribution.
See the true ROI of every channel and optimise spend with confidence.
You have data, but it isn’t ready to guide growth.
Build data infrastructure and reporting which scale.
Automated ingestion, real-time dashboards, AI enablement and more.
Turn reliable data into reporting that guides daily growth decisions.
Your project needs a custom approach.
We shape the data, measurement and delivery around how your business works.
Custom apps, machine learning, AI and more.
Get a tailored data and measurement programme built around your business.
HOW WE WORK
Clarity is built together.
We work to your timelines, with your tech stack and to your priorities.
Find out how we tailor our services to you.
Learn how we've helped businesses like yours.
Fussy - Data Foundations
Data infrastructure and visualisations leading to AI-enabled decision making.
Booksy - Marketing Effectiveness
Multi-market MMM to determine incremental ROI on media spend.
Amazon - Custom Influencer Tracker
Custom web app and light database for tracking influencer activity across 28 countries, saving over 600 days annually.
Why choose Day1Data?
Senior thinking, in the room.
A hands-on team of specialists works alongside yours—bringing deep experience without adding layers, handovers or distance.
Industry leaders from Meta, FarFetch, Monzo and the University of Cambridge.
Jake Barnett
Founder & CEO | Tesco, Farfetch
John Napoleon-Kuofie
Advisor | Monzo, Dentsu, Farfetch
James Stuart-Smith
Head of Analytics | Meta, Intuit, Samsung
Kris Gant
Head of Marketing Effectiveness | Ebiquity
Britt Dewing
Founder's Associate | Cambridge Graduate
Misha Freidin
Lead Analytics Engineer | Omnicom
Michael Siena
Data Scientist | Cambridge PhD
Meet the team
Meet the team
No black boxes.
Methods your team can understand, use and trust.
Built to stick.
We leave behind systems, capability and clarity that continue to compound long after launch.
Discover the Day1Data difference.
We leave behind systems, capability and clarity that continue to compound long after launch. Discover the Day1Data difference.
We leave behind systems, capability and clarity that continue to compound long after launch.
Discover the Day1Data difference.
Book a call
Compatible with your tech stack.
Official ThoughtSpot partner
Official ThoughtSpot partner
WHY CHOOSE DAY1DATA
The benefits of a lean agency like Day1Data vs …
01
Off-the-shelf SaaS products
SaaS products require a big time investment from your team, and still may lack the flexibility required. Our solutions are custom-built, fully transparent, and up and running with barely any lift from you.
02
Larger agencies
Larger agencies hand you a black-box model and a junior account team. We show our working at every step, led by senior analysts, without the agency price tag.
03
In-house team or contractors
Hiring in-house takes months and ties you to one person's bandwidth. Get a senior team scoped to the project, with none of the recruitment cycle or long-term overhead.
Frequently Asked Questions
Frequently Asked Questions
How are you different from Fospha?
Unlike SaaS tools like Fospha, we build fully bespoke models to measure true incrementality. Our approach accounts for all spend (online and offline), non-media influences such as seasonality and competitor activity and every sales channel (including retail, Amazon & Tiktok). Our pricing stays fixed as your business grows and we don’t just deliver a platform, we provide expert people to present insights and actively help optimise your marketing spend.
How are you different from Fospha?
Unlike SaaS tools like Fospha, we build fully bespoke models to measure true incrementality. Our approach accounts for all spend (online and offline), non-media influences such as seasonality and competitor activity and every sales channel (including retail, Amazon & Tiktok). Our pricing stays fixed as your business grows and we don’t just deliver a platform, we provide expert people to present insights and actively help optimise your marketing spend.
This sounds great, but how much do you cost?
Our plans start at £4,000/month. That includes people building bespoke models for you, software to help you self-serve insights and hands-on consultancy to support adoption and drive impact.
Surely this takes ages to set up?
Not at all - we finalise your custom models within 4 weeks and guide you through the entire process, from ideation to delivering real business value.
I need real-time insights. Is this possible?
We provide monthly insights that account for factors like pricing, promotions, competitors, and seasonality - elements that are difficult to capture accurately in real time. The risk of getting this wrong is massive, which is why we focus on delivering robust, reliable insights that drive confident decisions.
Why work with Day1Data?
We’re a team of ex-in-house data experts who’ve delivered this solution at companies like Farfetch, Tesco, Monzo, Burberry, Meta and Sky - helping them grow efficiently. Now, we’re here to do the same for you.
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director
I had the pleasure of working with D1 when they implemented experimentation & analytics solutions to help us measure our branded content activities. They are super knowledgeable about Marketing Analytics and were able to translate complex solutions that we could all understand.
Marisa Poster
PerfectTed, Co-Founder
Great team to work with. Deep expertise across MMM, LTV and MTA. Biggest win for me is the team is delivering high-value, auditable work that drives results - not a black box presentation for CMOs where no one looks under the hood and a real focus on making sure the outputs actually get used!
Faizal Kassam
WorldRemit, Marketing Science Lead
Day1data has been revolutionary for Twilio. We now have a steer on the reasons for our sales performance & the marketing contribution to revenue. This has helped us spend much more efficiently.
Rupali Singhal
Twilio, Head of International Marketing Analytics
We chose D1D over the others because I didn't want to get locked into yet another platform that wouldn't give me a custom solution & I wanted a better way to measure attribution than GA4. We love working with Day1!
Jamie Freed
Vieve Beauty, Chief Customer Experience Officer
Day1Data helped us move from siloed data sources to a more scalable, automated data foundation. They aligned our teams around consistent KPIs, connected our core data sources into BigQuery and built a validated semantic layer we can trust. It has given us a stronger base for reporting, decision-making and AI use cases.
Justus Buchen
Filu, COO
The team has been crucial in helping us to expand to Africa. The data warehouse and reporting suite digitalised our approach to marketing budget allocation and set us up for long-term success.
Freddy Lau
Hantec Financial, Group CEO
We loved working with D1 - they set up our marketing reporting & gave us solid insights that actually improved our marketing efficiency!
Ivo Devereux
Sapling Spirits, Co-Founder
We started working with D1 as we wanted to make data-informed decisions & remove manual reporting. They helped us in a really transparent way, setting up our warehouse, reporting suite and marketing analytics. We trust them and would definitely recommend.
Jacob Green
Hylo Athletics, Managing Director