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What is Tessl?

Tessl presents a cutting-edge AI-driven development platform that creates secure, high-quality code automatically tailored to your unique requirements. This revolutionary method for specification-focused development is built on rigorous, deterministic conformance testing, enabling users to define their needs while the AI generates the appropriate code. Tessl introduces a groundbreaking approach to software development, with artificial intelligence intricately woven into its foundation. The software produced through Tessl is constructed from small, modular components that work together to form complex systems. It is designed to integrate smoothly with current large language models and is flexible enough to adapt to future advancements in artificial intelligence technology. Inherent quality assurance is integrated into the Tessl platform through spec conformance testing and detailed code quality evaluations. This platform not only encourages pushing the boundaries of generative AI within an innovative, experimental environment but also allows users to explore various workflows, models, prompts, and more, fostering a collaborative experience centered around specifications. Additionally, Tessl’s high-quality, automatically generated documentation significantly simplifies the understanding and application of the code, enhancing accessibility. By streamlining the development process, Tessl paves the way for enhanced collaboration and innovation in the realm of software engineering, ultimately transforming how developers interact with technology. This forward-thinking platform signifies a pivotal shift in the software development landscape, promising to reshape the future of coding as we know it.

What is OpenSpec?

OpenSpec is a powerful open-source framework built to bring structure and predictability to AI-assisted software development. It introduces a spec-driven methodology that ensures requirements are clearly defined before any code is written. The platform organizes development work into structured artifacts such as proposals, specifications, design documents, and task lists, providing a clear roadmap for implementation. OpenSpec integrates seamlessly with over 20 AI coding tools, allowing developers to continue using their preferred assistants while maintaining consistency and organization. It promotes a flexible and iterative workflow, enabling teams to refine and update specifications as needed without rigid phase constraints. The framework uses command-based interactions to streamline processes such as proposing new features, applying changes, and archiving completed work. By aligning human intent with AI execution, OpenSpec reduces ambiguity and improves the reliability of generated code. It supports both small projects and enterprise-level development, making it highly scalable. The system also emphasizes good context management, helping AI tools deliver more accurate and relevant outputs. Developers can customize workflows and adapt the framework to suit their specific needs. Its lightweight design ensures ease of adoption without adding unnecessary complexity. Overall, OpenSpec empowers teams to build better software by combining structured planning with the speed and capabilities of AI-driven development.

Media

Media

Integrations Supported

Auggie CLI
Claude Code
Claude Haiku 3
Claude Sonnet 3.5
CoStrict
Crush
Cursor
Factory
Gemini
Gemini 1.5 Flash
Gemini Advanced
Gemini Nano
GitHub Copilot
Google Antigravity
Google Sheets
Kilo Code
OpenAI Codex
OpenCode
Qwen Code
XML

Integrations Supported

Auggie CLI
Claude Code
Claude Haiku 3
Claude Sonnet 3.5
CoStrict
Crush
Cursor
Factory
Gemini
Gemini 1.5 Flash
Gemini Advanced
Gemini Nano
GitHub Copilot
Google Antigravity
Google Sheets
Kilo Code
OpenAI Codex
OpenCode
Qwen Code
XML

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Tessl

Date Founded

2024

Company Location

United Kingdom

Company Website

www.tessl.io

Company Facts

Organization Name

Fission AI

Company Website

openspec.dev/

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