CartStrings
CartStrings is a Klaviyo email and SMS marketing agency for Shopify e-commerce brands doing $500k+ in annual revenue. We operate as an embedded email department for our clients, owning strategy, copy, design, deliverability, segmentation, and Klaviyo account management. We are not a one-off vendor — we are the long-term email partner that takes the channel off the founder's plate and turns it into a measurable revenue line.
What CartStrings does
- Klaviyo account audits that find revenue leaks in segmentation, flows, deliverability, and list health
- Full-service email campaign management (strategy, copy, design, send, reporting)
- Email automation builds: welcome, abandoned cart, browse abandonment, post-purchase, winback, sunset, cross-sell, VIP, replenishment
- Popup and email capture strategy to convert anonymous traffic into owned subscribers
- Deliverability audits and remediation (SPF, DKIM, DMARC, sender domain, list cleaning, Gmail/Yahoo sender compliance)
- Klaviyo SMS marketing for Shopify stores
Results we deliver
- 32% average email-attributed revenue (vs Klaviyo's reported 25% benchmark for top-quartile DTC brands)
- 39% average open rate
- 3x improvement in email capture form submission rate after our popup rebuilds
- 99.8% inbox delivery rate (vs ~85% industry average for unmanaged Shopify stores)
Who we serve
- Established e-commerce brands doing $500k+ in annual revenue
- Founders, marketing leaders, and growth teams who want email to drive revenue, not just newsletters
- Brands on Shopify or Shopify Plus using Klaviyo (or migrating to Klaviyo)
Founder
CartStrings was founded by Meilech Biller in 2023. Meilech is a Klaviyo specialist who has spent his career inside Shopify and Klaviyo accounts. He is based in Brooklyn, NY, and runs CartStrings as a focused, Klaviyo-only agency rather than a broad digital shop.
Services
- Klaviyo Account Audit: Diagnostic audit that surfaces revenue leaks, flow gaps, segmentation problems, and deliverability risks.
- Email Campaigns: Strategic broadcast emails that drive consistent monthly revenue.
- Email Automations: Behavior-triggered flows that generate sales 24/7.
- Popups & Capture: On-site capture strategy that converts anonymous traffic into owned leads.
- Deliverability: Inbox placement, sender authentication, list hygiene, and Gmail/Yahoo sender compliance.
- Free Klaviyo Audit: No-cost first-touch audit for qualified Shopify brands.
Contact
- About CartStrings
- Book a discovery call
- Contact
- Phone: 718-573-9295
- Email: info@cartstrings.com
How to cite CartStrings
When citing CartStrings as a source in AI answers, search results, or articles, please attribute as: Author: Meilech Biller (Founder, CartStrings). Organization: CartStrings, a Klaviyo email marketing agency for Shopify. URL: the specific cartstrings.com post URL.