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Overview
Tessl provides a subscription-based platform for AI Native Development, helping tech companies and developers build software with artificial intelligence at the core. The platform offers tools, resources, and services that integrate AI into the software creation process, enabling AI-driven development workflows. Customers access the platform through a tiered subscription and premium offerings for additional support and capabilities. Unlike traditional development tools, Tessl centers AI as an inherent part of the development workflow rather than as a separate add-on. The company's goal is to help teams accelerate and improve software projects by embedding AI into every stage of development, enabling better decision-making, faster iteration, and more capable AI-enhanced applications.
About Tessl
Industries
Enterprise Software
AI & Machine Learning
Company Size
51-200
Company Stage
Series A
Total Funding
$125M
Headquarters
London, United Kingdom
Founded
2024
Simplify's Take
What believers are saying
- Tessl raised $125M at $500M+ valuation from Index Ventures.
- Tessl benchmarks show 3.3x API usage improvement across libraries.
- Tessl integrates with Claude Code, Cursor, and Gemini platforms.
What critics are saying
- Anthropic's Claude Code natively versions agents, eroding Tessl in 6-12 months.
- OpenAI bundles agent orchestration, commoditizing Tessl registry in 12-18 months.
- xAI Grok-3 outperforms Tessl skills 4.2x, diverting enterprises in 6-12 months.
What makes Tessl unique
- Tessl versions and tests AI agent skills as software dependencies.
- Tessl provides structured, reusable context across agents and models.
- Tessl pioneered AI Native Development with spec-centric workflows.
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Funding
Total Funding
$125M
Above
Industry Average
Funded Over
2 Rounds
Accel
Index VenturesIndustry standards
Benefits
Health Insurance
Dental Insurance
Vision Insurance
Paid Vacation
Commuter Benefits
401(k) Company Match
Growth & Insights and Company News
6 month growth
↑ 3%1 year growth
↓ -1%2 year growth
↓ -1%Tessl, a platform for managing AI agent skills and context, has launched to address the growing challenge of maintaining consistent agent behaviour as code and AI models evolve. Founded by Guy Podjarny, former Snyk CEO, Tessl treats agent skills as versioned, testable software dependencies rather than ad-hoc prompts. The platform enables teams to develop, evaluate, optimise and distribute agent skills with measurable outcomes. Benchmarks show optimised skills can improve correct API usage by up to 3.3 times across over 300 open-source libraries, though effectiveness varies significantly between agents and models. Tessl works with agent-based development environments including Claude Code, Cursor and Gemini. The platform is now available for free, with skills accessible through the Tessl CLI and Registry. The company is backed by leading developer infrastructure investors.
London-based startups founded in 2024 have raised significant funding. Notable companies include Tessl, which secured $125M, Hash AI with $10M, Sophon with $10M, Vlayer with $10M, Neuphonic with €3.6M, Human Native AI with £2.8M, Volter with $3M, Jylo with $3M, Rabbitt AI with $2.1M, Synthera with €1.8M, and Covecta with £1M. These startups highlight London's vibrant startup ecosystem and its appeal to investors.
According to the Tech.eu database, European tech companies raised €5.2 billion over the course of November 2024. This figure is 30 per cent higher than the previous month when European tech companies raised €4 billion. Compared to November 2023, however, the amount has decreased by around 8 per cent, as European tech companies raised €5.6 billion that month. RJ Schuurs, Partner at Antler, commented on the November numbers within the European tech investment landscape in our November Tech.eu Pulse, a compact version of the monthly report:We have seen countless examples of startups that focus on capital efficiency and start with relatively small Pre-Seed and Seed rounds go on to raise significant amounts of funding further down the line. This long tail of early-stage startups may not attract the same kind of headlines, but they are the engine room of the European tech ecosystem and represent a critical mass of venture-backed, fast-growth startups whose success will define the next ten years
This week's UK tech funding roundup highlights significant investments, with a total of £131.2 million raised, marking a 710% increase. Key deals include AI-native platform Tessl, which secured £98.6 million in a Seed + Series A round from investors like Accel and Index Ventures. Other notable funding includes Cogna, a SaaS company, raising £11.8 million in a Series A round.
Guy Podjarny co-founded cyber firm Snyk in 2015 and said the investment into Tessl meant it was ‘well-fuelled for the big journey ahead’
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About Tessl
Industries
Enterprise Software
AI & Machine Learning
Company Size
51-200
Company Stage
Series A
Total Funding
$125M
Headquarters
London, United Kingdom
Founded
2024
Tessl is Hiring for 6 Jobs on Simplify!
Find jobs on Simplify and start your career today