Lein Digital Case Studies: 100+ Global Brands Trust Us
Since 2016, Lein Digital has worked with 100+ global brands, including Turkcell, Garanti BBVA, Kanal D and Carrefour SA. Here we share the results of our standout partnerships with measurable KPIs.
100+ Brands
Some of the Global Brands Growing With Lein Digital
Approach
How Does Lein Digital Work With Global Brands?
Our 100+ global brands did not all grow with the same playbook. For a medical tourism clinic, the metric that matters is lead quality; for an FMCG brand, shelf share and sell-through; in finance, the SME card activation rate. Every brand partnership is built around its own north-star metric. The case studies below show how each industry’s real profit-and-loss indicators were optimized, rather than generic digital marketing metrics.
01 · Discovery
Bringing All Your Data Into One View
GA4, Meta Ads Manager, Google Search Console, Google Business Profile, Hotjar: every data source tells its own story. In the discovery week, we bring 4–6 sources into one table to find the real bottleneck, the most critical foundation for the first three-month plan.02 · Pilot Phase
Low-Risk, Measurable Testing
In the first 6 weeks, we test channel by channel on a pilot budget. Which hypotheses hold, and which don’t? How far does CAC fall, and how does LTV take shape? The pilot provides real-world evidence before the brand commits its budget to large-scale investment.03 · Scale & Retention
Scalable Growth
Once the right channel, the right creative and the right lead segmentation are clear, we scale. Retention mechanisms run in parallel: email, CRM automation and customer segmentation. The value of existing customers stays in focus as much as new leads.
The case studies below show, step by step, which decisions on each discovery–pilot–scale journey led to which results. You’ll find selected examples from medical tourism, telecom, fashion and media.
Success Stories
Case Studies: Measurable Digital Marketing Results
Lein Digital’s case studies show measured results from medical tourism, media, telecom and fashion projects: Apera Health cut its cost per lead by 30% in 3 months, Vialife Clinic grew organic traffic by 180%, İrmet Hospital’s AI assistant handled 3,172 patient inquiries, and the Beyaz’la Joker promo film reached 65M+ views in its first 48 hours.
- 01
Medical Tourism
Apera Health
Digital Transformation in Medical Tourism- cost per lead
- −30%
- appointment conversions
- +52%
- 02
- 03
- 04
- 05
Medical Tourism
İrmet Hospital
Multilingual AI Patient Intake System- patient inquiries handled
- 3,172
- average first response
- 2.4 s
- handoffs to coordinators
- 491
- 06
Media
Beyaz’la Joker
AI-Produced Promo Film- views in the first 48 hours
- 65M+
- posts analyzed for the season
- 702
Results refer to the respective campaign periods.
Results
Our Digital Marketing Results in Numbers
Multi-channel campaign content production · campaign period
280%
Campaign ROI
Turkcell
AI-produced promo film for Beyaz’la Joker · first 48 hours
65M+
Promo Film Views
Kanal D
Medical tourism ads, +52% appointment conversions · in 3 months
−30%
Cost per Lead
Apera Health
Multilingual patient acquisition, +65% leads, −40% CPA · campaign period
+180%
Organic Traffic
Vialife Clinic
WhatsApp AI assistant, 2.4 s average first response · pilot period
3,172
Patient Inquiries Handled
İrmet Hospital
Meta, TikTok and Google Shopping ads, +85% sales · campaign period
+220%
Brand Awareness
Özgür Masur
Why Us
Why Do Brands Choose Lein Digital?
94% Client Retention
94% of our clients keep working with us. Long-term partnerships are the most tangible proof of trust.$400M+ Ad Spend Managed
We have managed $400M+ in ad spend, including $257M+ on Meta and $143M+ on Google. Budgets are paid directly to the platforms, with no commission on ad spend.Official Platform Partnerships
Google Partner, Meta Business Partner and Semrush Agency Partner; Türkiye’s first OpenAI Select Partner agency and the first agency in Türkiye to join Anthropic’s Claude Partner Network.Türkiye’s First GEO Agency
Founded in Istanbul in 2016, Lein Digital has practiced generative engine optimization (GEO) systematically since 2023, helping brands get cited as sources in ChatGPT, Gemini, Perplexity, Copilot and Claude answers.
Industries
Industries We Serve With Digital Marketing
- Medical Tourism
- E-Commerce
- Finance & Banking
- FMCG
- Retail
- Real Estate
- Automotive
- Technology & SaaS
- Media & TV
- Tourism & Hospitality
- Logistics & Maritime
- Beauty & Aesthetics
- Education
Your Questions
Lein Digital Clients and Case Studies: FAQ
Which brands has Lein Digital worked with?
Lein Digital has worked with 100+ global brands since it was founded in Istanbul in 2016. Clients include Turkcell, Garanti BBVA, Kanal D, Digiturk, Carrefour SA, Eti, Cheetos and Bomonti, along with healthcare organizations such as Apera Health, Vialife Clinic, İrmet Hospital and Medical Park. Its client retention rate is 94%.
What are Lein Digital’s standout case study results?
Lein Digital’s standout results include a 30% lower cost per lead and 52% more appointment conversions in 3 months for Apera Health, and 180% more organic traffic and 65% more leads for Vialife Clinic. İrmet Hospital’s AI assistant handled 3,172 patient inquiries in its pilot, and the Beyaz’la Joker promo film reached 65M+ views in 48 hours.
Does Lein Digital run campaigns for international markets?
Yes. Lein Digital runs multilingual campaigns for brands targeting audiences outside Türkiye. Apera Health’s patient acquisition funnel ran in Romania, the UK, Germany and New Zealand; Vialife Clinic targeted English-, German- and Arabic-speaking patients; and İrmet Hospital’s AI assistant greets patients in five languages, with pilot inquiries from more than 10 countries.
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