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Services · GA4 · GTM · Consent Mode v2 · BigQuery
Web and app analytics services: implementations, audits and consulting
I help e-commerce companies, B2B firms, mobile app owners and agencies measure what actually drives sales and leads. Below you will find all my services with starting prices. Not sure which one you need? Start with a free 30-minute consultation.
- 11+ years in analytics, 150+ companies
- Fixed price and deadline before we start
- I work in your accounts, the data stays with you
- You talk to the person who implements
Where to start
Which service do you need? Find your situation
Most clients come to me with one of the problems below. Find the sentence that fits you and go to the service that solves it.
| Your situation | Service | Price |
|---|---|---|
| GA4 shows different revenue than your store, or nobody in the company trusts the data | GA4 implementation | from €190 excl. VAT |
| You run a B2B website and cannot tell which campaigns bring enquiries | B2B analytics implementation | from €190 excl. VAT |
| You have no consent banner, or Google Ads is losing remarketing audiences | Consent Mode v2 and CMP | from €225 excl. VAT |
| Meta or Google Ads see fewer conversions than you actually get | Server-side tracking and Meta CAPI | from €225 excl. VAT |
| Something is wrong with your tracking, but you do not know what | GA4 and GTM audit | from €190 excl. VAT |
| Tracking breaks every time a new version of the site goes live | GTM and dataLayer | quote after consultation |
| Your mobile app data is incomplete or undocumented | Mobile app analytics | quote after intro call |
| GA4 reports are not enough, you need raw data and automated reporting | BigQuery and reporting | quote after consultation |
| You have one specific question or want a second opinion on your agency’s work | Consulting | from €67 / hour excl. VAT |
Prices exclude VAT. Updated October 2026. I give you an exact fixed price after the free consultation, before any work starts. EU companies with a valid VAT number are invoiced under reverse charge.
Implementations
Analytics implementations: tracking you can trust
An analytics implementation is the setup of GA4, Google Tag Manager and ad tags so that the numbers in your reports match your sales and enquiries. I finish every implementation with tests in GTM Preview and DebugView.
GA4 implementation for e-commerce and lead generation
For online stores and lead generation sites
- full GA4 e-commerce tracking, from product view to purchase
- lead conversions and custom dimensions
- no plugins that lose part of your transactions
- delivered in 2 to 3 weeks
Analytics implementation for B2B websites
For companies that sell through enquiries
- tracking of forms, phone clicks, emails and copied addresses
- lead source and GCLID passed into your CRM fields
- Google Ads conversions without double counting
- GTM template setup alone from €125 excl. VAT
CMP implementation with Google Consent Mode v2
For websites advertising on Google Ads and Meta
- consent banner: Cookiebot, CookieHub or Cookie-Script
- correct ad_user_data and ad_personalization signals
- tags that actually respond to the user’s choice
Server-side tracking and Meta CAPI
For stores and companies spending on Google Ads and Meta
- Stape Gateway or a full server-side GTM container for GA4 and Google Ads
- Meta CAPI (Conversions API) on your own subdomain
- purchase deduplication by order number
Google Tag Manager and dataLayer
For companies with their own development team
- a dataLayer specification ready to hand to your developers
- a tidy GTM container with clear naming
- tracking that survives the next deploy
Mobile app analytics (GA4 / Firebase)
For iOS and Android app owners
- 4 steps: from diagnosis to documentation for developers
- an event plan matched to your app’s screens
- the whole process usually takes 2 to 4 weeks
BigQuery and marketing data reporting
For companies that have outgrown GA4 reports
- GA4 export to BigQuery, without retention limits or sampling
- ad and sales data in one place
- automated KPI reports by email or Slack
Audits
Audits: find out what you are really measuring
An analytics audit is a review of your GA4, GTM and ad tag setup that ends with a report listing errors and fix priorities. I make simple fixes during the audit at no extra cost.
GA4 and Google Tag Manager audit
For websites and online stores
- discrepancies between your store or CRM and GA4
- double-counted conversions and broken GDPR consent
- a prioritised report: critical, important, minor
- ready-made tasks for your team
Web and app analytics audit
For companies with a website and a mobile app
- the whole ecosystem: GA4, Firebase, PostHog
- Meta, TikTok and LinkedIn pixels
- for multi-platform e-commerce, SaaS and software houses
Consulting
Consulting: fast help with a specific problem
A consultation is an online meeting where we diagnose the problem on your screen or plan an implementation. The first 30 minutes are free, further hours come in packages.
Analytics and marketing consulting
For marketers, business owners, product teams and developers
- packages of 1, 4 or 10 hours
- 1 hour: €75, 4 hours: €285, 10 hours: €670, excl. VAT
- live debugging of GTM, GA4, Consent Mode and Meta Pixel
- meeting recording and a written summary
White-label work for agencies
For marketing, UX and performance agencies
- GA4, GTM, Consent Mode and server-side setups for your clients, under your brand
- you keep the client relationship, I deliver and document
- independent review of an existing setup before you take over an account
Prefer to start on your own? Run the free GA4 audit, get the free GTM template for B2B websites or check your enhanced conversions hashes in the SHA-256 tester.
All free toolsHow I work
You know the price before we start
Every project starts the same way, whatever the service. That way you never pay for something you do not need.
Free 30-minute consultation
You tell me what is not working. I look at your GA4, Meta or CMP data and tell you what you actually need.
Fixed price and deadline
You get the scope, price and deadline in writing. If you do not need a service, I tell you so.
Access without passwords
You add me as a user in GTM, GA4 and your ad accounts. Everything stays in your accounts.
Implementation, testing and sign-off
I test every event before publishing changes. Your developer gets ready instructions when they are needed.
Who is behind these services
Marcin Miłowski, GA4, GTM and BigQuery consultant
I have worked in analytics and online marketing for more than 11 years and delivered projects for over 150 companies. I implemented analytics for Inter Cars, ran PPC and measurement for Vercom (EmailLabs, PushPushGo) and trained teams at Orange and 4F.
I work on my own, so you talk to the person who implements. I work alongside your developers or agency, and I deliver white-label projects for agencies. Based in Poland (CET), working remotely in English and Polish.
Questions before we work together
How much does the first call cost?
Nothing. Every new client gets a free 30-minute consultation. After the call you know which service you need and what it costs.
I do not know what I need. Where do I start?
With the free consultation. If your GA4 or GTM account has many problems at once, I usually suggest a GA4 and GTM audit, because it gives you a prioritised list of errors.
Do you give a fixed price before starting?
Yes. For implementations and audits we agree the price and deadline before work begins. Consulting is billed hourly: from €67 per hour excl. VAT in a 10-hour package, valid for 6 months.
Do you work with our developers or agency?
Yes. I prepare the dataLayer specification and instructions for developers, and I deliver white-label implementations for agencies.
Do our data and accounts stay with us?
Yes. I work in your GA4, GTM and Google Ads accounts as an added user. I never need passwords.
How do you invoice clients outside Poland?
In euros, excluding VAT. Companies in the EU with a valid VAT number are invoiced under the reverse-charge mechanism.
Not sure which service to choose? Let’s talk for 30 minutes
Free and with no obligation. After the call you know what you need, what it costs and when I can start.