Zaraz
AcquiredYC W20San Francisco, US · Founded 2019 · 2 employees · 4 known investors
Zaraz built a third-party tool manager that loaded analytics, marketing, and other scripts server-side or in the cloud to improve website speed, privacy, and security. Acquired by Cloudflare in 2021.
Also known as Sweeps · Cloudflare Zaraz
Founders & leadership· Y Combinator alumni (W20)
Zaraz was founded in 2019 by Yair Dovrat and Yo'av Moshe.
Investors · 4
Company profile
researched Aug 2026Zaraz develops a third-party tool manager that moves analytics, advertising, marketing, chat and similar scripts off the browser and runs them in the cloud. Using Cloudflare Workers, the technology replaces the multiple network requests generated by each third-party tool with a single request, which the company positions as improving page performance, privacy and security. Because the tools execute server-side, third-party code cannot create username or password fields or read cookies stored in the visitor's browser, and a failing or slow script cannot block page rendering.
Following its acquisition by Cloudflare, Zaraz is offered as a Cloudflare product available on all plans. Users add tools from a catalog through the Cloudflare dashboard and configure events, triggers and actions; automatic actions cover pageviews, events and e-commerce. Zaraz provides a client-side Web API with zaraz.track(), zaraz.set() and zaraz.ecommerce() methods, support for Custom Managed Components, single-page-application pageview handling, a consent management platform with Google Consent Mode v2 support, debug mode and monitoring metrics. It is designed to work on sites proxied by Cloudflare, with a documented path for domains that are not proxied.
Founding story
The company was founded in 2019 by Yair Dovrat, who served as CEO, and Yo'av Moshe, and joined Y Combinator's Winter 2020 batch. The founders have said the product could not have been built without the global scale, speed and flexibility of Cloudflare Workers, which they used to optimize for performance and security.
Business model
Zaraz operated as a B2B SaaS company before being acquired; its technology is now distributed as a feature of Cloudflare's platform, available across Cloudflare plans and initially released to enterprise customers with a free beta for other customers.
Traction
At the time of the acquisition the company employed six people and had a two-person founding team listed by Y Combinator. Cloudflare stated it had tested Zaraz for about six months before acquiring it and made it immediately available to enterprise customers, with a free beta for other customers.
Latest developments
Post-acquisition roadmap items described by the founders included geolocation triggers to load different tools for visitors in different regions for local regulatory compliance, and a data loss prevention feature to scan third-party endpoint requests for personal data such as names, email addresses and Social Security numbers. Cloudflare Zaraz documentation continues to be maintained, with pages updated in 2026.
▸Full profile — market position, technology, go-to-market, geography, history, risks & controversies
Market position
Zaraz was an early-stage startup in the third-party tag management and website performance space; after acquisition its technology was positioned to run across Cloudflare's network, which sits in front of nearly 20 percent of all websites.
Zaraz's approach of loading third-party tools in the cloud rather than the browser removes browser-side attack surface and reduces performance overhead; the company claimed websites load about 40 percent faster by optimizing third-party tool loading. Because tools run server-side, they are not visible to browser extensions, requiring Zaraz's own debug and monitoring tooling.
Technology
Zaraz runs third-party tools server-side on Cloudflare Workers at the network edge, consolidating multiple third-party network requests into a single request. It supports a tools catalog, Custom Managed Components, triggers/actions configuration, a unified Web API (track, set, ecommerce, spaPageview), consent management including Google Consent Mode v2, IP anonymization or withholding for analytics tools, compatibility with Content Security Policies, and auto-injection of its script into page HTML.
Go-to-market
Website operators and businesses that load third-party analytics, advertising pixels, chatbots, marketing automation and CRM tools, ranging from small sites to enterprises; the product was first made available to Cloudflare enterprise customers.
Geography
Listed by Y Combinator in San Francisco, and described in press coverage as based in Tel Aviv, Israel; a funding database records a Tel Aviv-Yafo mailing address. The product now runs on Cloudflare's global network.
History
Zaraz was founded in 2019 and participated in Y Combinator's Winter 2020 batch. It raised seed funding led by PICO Venture Partners. In December 2021, Cloudflare announced its acquisition of the company; terms were not disclosed. Cloudflare had tested the technology for roughly half a year prior to the deal, and Zaraz was the first company Cloudflare acquired that was built on Cloudflare Workers. The product continues to be developed and documented as Cloudflare Zaraz.
Risks & controversies
Cloudflare noted that third-party script developers who do not properly secure their scripts may find those scripts stop working as Zaraz is rolled out more broadly. Documentation also notes operational caveats such as recommending Rocket Loader be disabled when using Zaraz, data discrepancies with Google Analytics when originating IP addresses are hidden, and reduced automatic event coverage compared with standard GA4 snippets.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 3
launches, deals, and filingsCloudflare acquired Zaraz to speed up and secure websites by reducing the impact of third-party marketing and analytics tools. Terms of the deal were not disclosed. Zaraz was the first company Cloudflare acquired that was built on Cloudflare Workers.
Following the acquisition, Zaraz became immediately available to Cloudflare enterprise customers, with a free beta version accessible to other Cloudflare customers from their dashboard.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 8
primary sources listed
- Zarazzaraz.com · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Zaraz do?
- Zaraz is a third-party tag and script manager, now a Cloudflare product, that offloads website tools to the cloud edge.
- Who founded Zaraz?
- Zaraz was founded by Yair Dovrat, Yo'av Moshe in 2019.
- Who are Zaraz's investors?
- Zaraz's investors include Cabra VC, Emles Venture Partners, Y Combinator, PICO Venture Partners.
- Where is Zaraz headquartered?
- Zaraz is headquartered in San Francisco, US.