Ninetailed
AcquiredBerlin, DE · Founded 2021 · 2 employees on LinkedIn · 23 known investors
Acquired by Contentful August 2024 · terms undisclosed · source ↗
Ninetailed offers a personalization platform that enables web teams to create and deliver tailored content experiences without developer support. The platform integrates with content management systems and data sources to enable audience segmentation, A/B testing, and dynamic content personalization across web properties and regions.
Also known as Ninetailed GmbH · Ninetailed by Contentful · Contentful Personalization
Founders & leadership
Ninetailed was founded in 2021 by Sascha Konietzke, Paolo Negri, Andy Kaiser, and Alexander Braunreuther.
Board
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Investors · 23
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Also in the syndicate · 5
Funding
SEC filings, press & company announcements$180M disclosed across 2 of 4 rounds · 2021–2022
- $5MraisedOct 2022 · 2 sourcesSource ↗
▶$175MraisedAug 2021 · 14 investors · Other TechnologyRule 506(b)
- Steve SloanExecutive Officer, Director
- Andreas WeiskamDirector
- Elena DonioDirector
- Frederick BallDirector
- Margo M SmithExecutive Officer
- Sascha KonietzkeExecutive Officer, Director, Promoter
- Paolo NegriExecutive Officer, Director, Promoter
- Suranga ChandratillakeDirector
- Trevor OelschigDirector
- Christine HeckartDirector
- Carla CooperExecutive Officer
- Eric VishriaDirector
- Offering amount
- $175M
- Amount sold
- $175M
- First sale
- Jul 2021
- Incorporated
- Corporation, Delaware, 2020
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Company profile
researched Aug 2026Berlin founders Andy Kaiser and Alexander Braunreuther built Ninetailed as an API-first, edge-delivered personalization and experimentation layer for headless CMS and Jamstack architectures. The product connected customer data and content systems, exposed code-free experience creation inside CMS workflows, and measured conversion lift. After a €0.8m early round and €5m seed round, Contentful agreed to acquire the company in August 2024 and completed/reintroduced it as Ninetailed by Contentful; in March 2025 it became Contentful Personalization inside Contentful's Optimization workspace. The inherited product now covers segmentation, analytics, experiments, AI audience/experience/variant suggestions, multi-armed-bandit allocation and custom flags. The original $175m database value belongs to Contentful's Series F—not Ninetailed—and is corrected here to €5.8m of disclosed Ninetailed financing (about $6.54m in contemporaneous USD aggregation).
Founding story
Kaiser and Braunreuther set out to remove the latency and workflow fragmentation of legacy personalization tools by building a lean edge API directly into composable CMS workflows.
Business model
B2B SaaS for composable digital-experience personalization and experimentation; now an integrated Contentful product.
Previously subscription SaaS with usage/traffic and enterprise packaging; now sold through Contentful plans and custom enterprise contracts.
Traction
Named shared customers included Kraft Heinz, Ace & Tate, SumUp and Ruggable. Contentful currently publishes customer outcomes including 78% higher conversion for Ace & Tate, 43% digital-sales growth for Ruggable and a Kraft Heinz case with under 30 minutes to personalize and 7x CTR; these are case-specific, company-reported results.
Latest developments
Contentful Personalization now sits in the Optimization workspace and adds AI suggestions, multi-armed-bandit traffic allocation, content insights, custom flags and connectors including Shopify, Klaviyo and SAP Emarsys.
▸Full profile — market position, technology, go-to-market, geography, history, ownership, risks & controversies
Market position
A specialist composable-DXP personalization layer that became Contentful's native personalization and experimentation product.
Personalization embedded in the structured-content workflow with low/no-code marketer control and an architecture designed for headless-site performance.
Technology
API-first personalization engine, edge delivery, CMS/CDP connectors, audience segmentation, experimentation, analytics, feature/custom flags and generative-AI suggestions.
Go-to-market
Composable-technology integrations and ecosystem partnerships, product-led trials/demos, shared customers with Contentful and enterprise solution selling.
Digital commerce, consumer brands and enterprise marketing/product teams using headless CMS and customer-data stacks.
Marketing, growth, ecommerce, product, web and developer teams.
Geography
Founded in Berlin and sold globally through composable-technology ecosystems; now distributed by US-headquartered Contentful.
History
Founded in 2021; early €0.8m financing January 2022; €5m seed October 2022; definitive Contentful agreement August 20, 2024; acquisition welcomed/operational August 27, 2024; rebranded and embedded as Contentful Personalization March 31, 2025.
Ownership
Wholly owned and integrated by Contentful; transaction price and consideration were not disclosed.
Risks & controversies
Standalone Ninetailed branding and plans have been sunset, so historical product claims should not be treated as a separate current vendor. Personalization depends on sufficient traffic/data, privacy-compliant identity resolution and reliable experimentation. Acquisition economics, revenue and retention are undisclosed.
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.
Customers & partners
Named customers · 4
Partnerships · 1
Relationships the company or its partners disclosed publicly — case studies, joint announcements, press.
Acquisitions · 1
Early investors' stakes continue via these dealsTimeline · 3
launches, deals, and filingsThe web app was merged into Contentful's Optimization workspace.
Strategic acquisition to add AI-driven personalization and experimentation; terms undisclosed.
Andy Kaiser and Alexander Braunreuther launched a composable personalization API.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
Legal entities · 1
corporate structureIn the news
Contentful raises $175M at a $3B valuation from Tiger for its content delivery service | TechCrunchtechcrunch.com · Jul 2021▸Research sources · 8
primary sources listed
- Ninetailed case studyContentful · case study
- Introducing Contentful PersonalizationContentful · product announcement
- Welcoming Ninetailed to ContentfulContentful · acquirer blog
- Contentful signs definitive agreement to acquire NinetailedContentful · acquirer press release
- From pre-seed to Contentful acquisitionFirst Momentum Ventures / Andreas Fischer · investor commentary
- Contentful PersonalizationContentful · product page
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Ninetailed do?
- Composable personalization and experimentation software acquired and integrated into Contentful Personalization.
- Who founded Ninetailed?
- Ninetailed was founded by Sascha Konietzke, Paolo Negri, Andy Kaiser, Alexander Braunreuther in 2021.
- Who are Ninetailed's investors?
- Ninetailed's investors include Balderton Capital, Cherry Ventures, Gaia Ventures, Grand Ventures, Heavybit, Mosaic Ventures, OMERS Ventures, Sapphire Ventures and 10 more.
- How much funding has Ninetailed raised?
- Ninetailed has disclosed $180M raised across 2 of its 4 known rounds.
- Where is Ninetailed headquartered?
- Ninetailed is headquartered in Berlin, DE.