What is YAYZY?

YAYZY is a fintech platform that makes it easy to live a sustainable lifestyle. The YAYZY app helps you understand your carbon footprint and get guidance to reduce and offset it effortlessly.

Use YAYZY to:

• Calculate your carbon footprint automatically

• Understand what your carbon footprint means

• Keep track of the impact of your purchases

• Become carbon neutral with offsets

• Get tips to reduce your impact

• Discover eco-friendly retailers

How does YAYZY make money?

YAYZY sells carbon offsets to help people reduce their impact on the environment. YAYZY takes a small fee of £0.00125 per 1kg of carbon offsets. So, if you offset 1,000kgs YAYZY's fees will only be £1.25.

Our pricing model is cheap, easy to understand and transparent. Additionally, all carbon offset projects are treated equally which aligns interests.  

The fees are reinvested in the development of climate technology to help everyone reduce their carbon emissions, become carbon neutral and avoid environmental impact. We’re a for profit organization because we believe for profits have more tools to tackle the biggest problems humankind face.

What’s my carbon footprint?

Your carbon footprint is the amount of carbon dioxide and other greenhouse gases (GHG) released into the atmosphere as a result of your activities and lifestyle. Your carbon footprint is the best estimate you can get of your impact to climate change. It is measured in kilograms of Carbon Dioxide equivalent (kg CO2e).

What should my carbon budget be?

Your carbon budget is the amount of greenhouse gases, measured in kilograms, that you set as your individual upper limit per month. For your reference, an average British person emits 800 kilograms of greenhouse gases per month. In order to be below the global budget of a temperature increase of 2°C by 2050, every person on earth should be limited to 191kg per month (2.3 tonnes per year). However, we should all aim to be climate positive and help remove carbon dioxide from the atmosphere.

How does the carbon footprint calculation work?

Your carbon footprint is related to your lifestyle. YAYZY developed an innovative algorithm that uses your bank account transactions to calculate your carbon footprint. To calculate your monthly carbon footprint, we estimate the emissions of each of your transactions and we sum it all together.

The carbon footprint of each transaction results from multiplying the amount spent of each payment transaction times the corresponding greenhouse gas (GHG) emissions intensity factor on a product, company or sub-category level.

Money spent * GHG emission intensity factor = Carbon Footprint

YAYZY Carbon Footprint Algo © sources Green House Gas intensity factors from multiple renown sustainability data providers such as, Vitalmetrics, UK Government Guidelines for Carbon Footprint reporting, and United Nations International Civil Aviation Organization (ICAO).

In case you would like to learn more or contribute knowledge, please reach out to hello@yayzy.com


YAYZY developed the most advanced algorithm to calculate an individual’s carbon footprint. YAYZY Carbon Footprint Algo © uses data science to identify the sources of greenhouse gases emissions (GHG) within your payments data and match them against the best greenhouse gas intensity factor to get the most accurate and bespoke estimation of your personal carbon footprint.

In order to compute the most accurate carbon footprint estimation, the YAYZY Carbon Footpring Algo © matches payment information on a product, retailer or subcategory level against the appropriate greenhouse gas intensity factor. The more granular the data, the more accurate the estimation.

Money spent (£) * GHG emission intensity factor (kg of CO2e / £) = Carbon Footprint (kg of CO2e)

The YAYZY Carbon Footpring Algo © gets payments data from TrueLayer, an FCA regulated firm that provides an API to access data from your bank accounts and cards. Moreover, it gets itemized transaction information directly from retailers (with your consent), and direct integrations to lifestyle apps such as Uber, Ryanair, London Underground among others. YAYZY keeps integrating sources of payments data to increase the accuracy of the carbon footprint estimation.

YAYZY Carbon Footprint Algo © sources Green House Gas intensity factors from Vitalmetrics, greatly renown sustainability data provider, UK Government Guidelines for Carbon Footprint reporting, and United Nations International Civil Aviation Organization (ICAO).

The greenhouse gas (GHG) intensity factors are sourced mainly from VitalMetrics’ Comprehensive Environmental Data Archive (CEDA), a suite of environmental input-output (IO) databases that are designed to assist various environmental systems analyses, including life cycle assessments (LCA), carbon footprinting, water footprinting, and sustainable spend analyses. CEDA quantifies products’ natural resources use and environmental emissions throughout their life cycles by connecting input-output tables, which represent the entire supply-chain network of an economy.

For specific use cases we get additional user inputs to increase the accuracy of the carbon footprint estimation. As an example, in order to increase the accuracy of air travel, you can input departure airport, arrival airport, and cabin class, then the YAYZY Carbon Footprint Algo © will compute the carbon footprint using fuel consumption by aircraft type for your specific journey.

YAYZY follows best-in-class carbon footprint methodologies that are followed by publicly listed corporations and tailors it for you. In case you would like to learn more or contribute knowledge, please reach out to hello@yayzy.com

What is YAYZY's sustainability rating?

The YAYZY rating is an easy to understand, one to five rating of a retailers’ sustainability efforts. It is designed to help you assess the sustainability efforts of retailers as purchase criteria.

YAYZY uses Environmental, Social and Governance (ESG) third party data bases and publicly available data that helps you evaluate the implementation of sustainability best practices. We focus on four main pillars:

1. Carbon

2. Governance

3. Sustainability

4. Procurement

Carbon: efforts to reduce absolute emissions, reduce emissions revenue intensity and carbon offsetting. We use 3 key criteria and check the implementation of 4 certifications.

Governance: transparency and policy implementation towards building a better future. We use 8 key criteria and check the implementation of 12 certifications.

Sustainability: efforts towards maximizing resource efficiency and creating circular economies. We use 7 key criteria and check the implementation of 9 certifications.

Procurement: highest ethical & sustainability standards in product & ingredient sourcing. We use 9 key criteria and check the implementation of 30 certifications.

We classify retailers into subcategories, define the sustainability criteria that apply to each subcategory, calculate a max score per category and assign a one to five rating.


Is the YAYZY app free?

YAYZY is free and has to be free, we’re on a mission to making sustainability easy and removing all barriers to help reduce humankind’s impact to the environment.

Why do I need to link my bank account?

Your carbon footprint is related to your lifestyle, which in-turn depends on how you spend your money. Connecting your bank or credit card gives us access to your transactions, which we use to calculate your carbon footprint.

We want to make climate action as effortless as possible for you. By linking your bank account or credit card, you can automatically start tracking your personal carbon footprint –no input required from you and connect your spending to its impact on the planet in real-time. That is amazing!

Linking your account is completely secure and safe:

Your data is completely secure: We use bank level encryption and security with a view-only access to your transactions. We do not see your login details.

Your data is yours: We do not sell your data to third parties or use it to sell you any third-party products.

You are in control: You can revoke access at any time.

FCA registered: YAYZY is on the Financial Conduct Authority register (Reference number: 923191)

How safe is the YAYZY app?

Protecting and keeping your data safe is our highest priority. We operate to the same security standards as your bank, you can think about using YAYZY the same way you think about using your bank’s mobile app. We use a technology called “Open Banking” which is operated by all big European banks. In addition, your bank or credit card login details are never stored in our systems. As safe as it gets!

Bank Grade Encryption

YAYZY uses several state-of-the-art security measures, including the same end-to-end 256-bit TLS encryption used by all major banks.

Regulated by the Financial Conduct Authority

YAYZY is on the FCA register (ref: 923191) and has been approved by the FCA to act as a regulated agent of TrueLayer . This means that TrueLayer, which is authorised by the FCA (reference number 901096), is providing YAYZY the regulated account information service. In the meantime, YAYZY is in the process of getting its own account information service license from the FCA under Payment Services Regulations and expects to get so soon.

View Only Access

We have access to your data in read-only mode. This means we cannot make any changes to your account, including initiating any payments. Our app only "views" the information that you authorise use to.

Registered with the Information Commissioner’s Office

We are also registered with the Information Commissioner’s Office (ICO). YAYZY’s Data Protection Registration Number is: ZA658008

Security Veterans Team

Our team has world class experience building security in financial platforms.

How do you use my data?

• To calculate your carbon footprint

• To improve our transaction categorization engine, so the little coffee shop in the countryside can accurately be classified as a coffee shop.

• That’s all! 😊

Do you sell my data?

Your data is your property, we do not sell it to any third parties and do not use it to sell you any third-party products.

If I connect my account, what data will you have access to?

The YAYZY app will have read-only access to your account and transaction details – including direct debits and standing orders. We cannot initiate any transactions or payments.

Do you store my online banking login details?

No. We don’t view or have access to your login details. YAYZY uses the Open Banking technology to manage the connection to your account. This connection is completely secure and encrypted and this technology is used by more than 2 million people in the UK

What is TrueLayer?

YAYZY uses TrueLayer Account Information Services to link your bank account. TrueLayer is a renownd FCA approved open banking provider based in London. We’ve chosen to work with them because we believe they are the safest and have the best infrastructure.

If you’re interested in learning more about them visit the TrueLayer website and check how TrueLayer handles security.

YAYZY Limited is acting as an agent of TrueLayer, who is providing the regulated Account Information Service and is Authorised and Regulated by the Financial Conduct Authority under the Payment Services Regulations 2017 and Electronic Money Regulations 2011 (Firm Reference Number: 901096).

What do I do if my bank account is not supported?

In order to use YAYZY, you will need to connect a current account, savings account or credit card account. Most bank accounts and credit cards are supported, but unfortunately if your bank account is not supported you will not be able to use the app. If your bank account is not supported leave us a comment in our community forum and we’ll look into integrate it as soon as possible.

How do I delete my bank account?

If you would like to disconnect your bank account from YAYZY:

• Click on “Account Settings” button in the top right corner of Home or My Impact

• Tap on “Accounts”

• Click on “Delete Bank”

This deletes all the data the YAYZY app has of your bank permanently.

How do I delete my YAYZY account?

We would like to have a chance to solve the issue you have before you go, please email us at hello@yayzy.com. If you want to delete your YAYZY account:

• Click on “Account Settings” button in the top right corner of Home or My Impact

• Tap on “Delete Account”

• Click on “Yes, delete my account”

This deletes all the data the YAYZY app has of your bank permanently and your account details information.

Can I connect multiple accounts?

Currently YAYZY only supports connecting one account but we’re working hard so that you can connect multiple accounts to have a comprehensive view of your impact to the environment.

Can I change a transaction category?

Having correct transaction classification is crucial to calculate accurate carbon footprint estimations. In case a transaction is categorized incorrectly tap on the transaction to see the transaction details, then type on the transaction category” and edit category and subcategory.

Which countries is the YAYZY app available in?

The YAYZY beta app is currently available in the 🇬🇧 UK. We’re planning to expand to continental Europe, US and Canada soon. Drop us a message in our community forum and tell us where which country you would like to be supported. Keep your belts tight and subscribe to our newsletter to stay tuned!

About Subscriptions

Why subscribe?

It’s the easier way to compensate your impact on the planet. Select how much you want to contribute, and we’ll make the hard work of removing carbon from the atmosphere for you. You’ll save money too – subscriptions are priced cheaper than single offsets. You can pause, change, or cancel your subscription anytime.

What happens once I subscribe?

Every month, you will be funding the best climate crisis solutions. Once we collect your payment, we distribute the funding to our carbon project partners. We also send out an email sharing updates so that you can follow your contribution.

What’s the difference between Neutral, Positive and Hero?

We’ve estimated that the average carbon footprint of our customers is around 800kgs per month. But it entirely depends on your spending and your lifestyle. You can choose the subscription plan that fits best to your lifestyle our the level of contribution that you want to make.

• Climate Neutral: offset 1x average carbon footprint: 800 Kgs of CO2e

• Climate Positive: offset 2x average carbon footprint: 1.72 tonnes of CO2e

• Climate Hero: offset 5x average carbon footprint: 4.4 tonnes of CO2e

How do I cancel or modify my subscription?

You can cancel or modify your subscription anytime by login into your account on YAYZY’s website.

How can I be sure these projects are really stopping climate change?

YAYZY has a strict methodology that involves doing research, standards and due diligence to guarantee we’re selling the best projects that provide long-term global benefits. We make sure the projects provide:

Additionality: the project reduces greenhouse gas emissions that would not be reduced through other incentives

Leakage prevention:prevent the leak or shift to another location or activity

Permanence: making sure green house gases are prevented from entering the atmosphere permanently

Verifiability: an objective third party that measures the performance).

However, don’t just take our word for it. We provide publicly available information that hopefully clarifies how each project is contributing towards climate change and links to our project manager websites and third party verifications. You can visit the climate compensation projects information page here.

How can YAYZY prove my contribution is going to the projects?

We publish certificates each month of how many tonnes of CO2 (‘carbon credits’) have been prevented from going into the atmosphere or removed from it.

About Offsets

What are carbon offsets and how do they fight climate change?

A carbon offset is a reduction in emissions of carbon dioxide and other greenhouse gases that compensate for emissions made elsewhere. Carbon offsets are created by carbon offset organizations that prevent and remove carbon emissions from the atmosphere and verified by greatly renowned institutions.

YAYZY works with the leading organizations across the planet that create the biggest positive impact on the environment and on society. Projects consist on protecting forests, using agriculture methods that remove carbon, clean energy generation and capturing carbon straight from the air. Check YAYZY’s carbon offset projects in the Offsets screen of the YAYZY app.

In case you want to learn more or suggest adding an innovative and impactful carbon offset project please reach out to hello@yayzy.com.

Is it good enough to only offset my carbon footprint to fight climate change?

No! 🙉 Offsetting your carbon footprint do help prevent emissions and remove carbon from the atmosphere. However, the best solution to fight climate change is avoid emitting carbon and other greenhouse gases on the first place.

The biggest contributors to your personal carbon footprint are fossil-fuel heavy transportation such as flights, fossil-fuel heavy electricity and red-meat-intensive meals. So, to help fight climate change try reducing your flight travel, switch to a green electricity provider and introduce a meat and dairy free day per week. Also help spread out knowledge with your family and friends.

Try to reduce your footprint by fine-tuning your lifestyle and shopping wisely. And become climate neutral or climate positive by offsetting the purchases you can’t avoid like flying back home for Christmas. YAYZY is here to help 😊

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