--- title: "Introducing Lens Loop: The World's First Power Tool for LLM Application Developers — Lens Blog — Lens" description: "The first IDE purpose-built for observing, debugging, and improving LLM-powered applications. Powered by OpenTelemetry, Loop gives you full visibility into every model call so you can ship AI features with confidence instead of guesswork." url: https://lenshq.io/blog/introducing-lens-loop/ --- [← Blog](https://lenshq.io/blog/) Announcements # Introducing Lens Loop: The World's First Power Tool for LLM Application Developers Miska Kaipiainen November 18, 2025 4 min read Lens Loop has evolved into Lens Agents This announcement is from November 2025 and is kept here as a record of it. Lens Loop has since evolved into [Lens Agents](https://lenshq.io/products/lens-agents/), the governed platform for running AI agents on enterprise systems. Start there for what the product does today. Today at Microsoft Ignite 2025, we're introducing something new — a product we believe every serious **LLM application developer** will soon keep open all day next to their editor. Meet [**Lens Loop**](https://lenshq.io/products/lens-loop/): the first IDE purpose-built for observing, debugging, and improving LLM-powered applications. Designed for developers and powered by OpenTelemetry, Loop gives you full visibility into every model call so you can ship AI features with confidence instead of guesswork. ## LLM Applications Are Still a Black Box If you've ever debugged an LLM workflow, optimized a prompt, chased down latency spikes, or wondered why something suddenly costs 3× more, you already know the pain. Traditional logs and APM tools weren't built for prompts, tools, reasoning steps, or model behavior. They tell you *that* something happened — not **why**. So teams fall back to screenshots, printouts, copy-paste prompts, and "just run it again." That doesn't scale when you're building real AI products. **Lens Loop changes that.** Loop turns every LLM interaction into rich, structured traces so developers can: - **Observe** what actually happened - **Understand** why it happened - **Improve** workflows with real data This is the visibility layer AI development has been missing. ## Meet Lens Loop IDE Lens Loop is your second screen for working with LLMs — an IDE built for the realities of modern AI development. ![Lens Loop IDE](https://lenshq.io/blog/introducing-lens-loop/img-1.webp) From your first prototype to production-scale traffic, Loop gives you one developer-first workspace to: - Observe LLM behavior in real time - Understand bottlenecks, anomalies, and cost drivers - Improve prompts, models, and agent flows with confidence If you build LLM-powered applications, this is the tool you've been waiting for. ## What You Can Do With Loop Loop is built around a simple principle: **LLM application developers need to Observe, Understand, and Improve — continuously and with complete clarity.** Here's what Loop unlocks: ### Observe: See Exactly What Your AI Is Doing LLM applications are multi-step, multi-tool, dynamic systems. Loop reveals the full picture: - Every LLM call, retry, and intermediate step - Tool invocations, RAG retrievals, and chain-of-thought-style behavior - Cost, tokens, latency, and parameters — all captured automatically - End-to-end traces via OpenTelemetry, locally or remotely No more guessing. No more scattered logs. Just a live, developer-friendly view of everything your AI is doing. ### Understand: Find the Root Cause — Fast Loop helps you make sense of the complexity: - Visual waterfalls expose bottlenecks and dependencies - Trace views highlight anomalies and quality issues - Insights surface outliers, spikes, percentiles, and trends - Cost and token analysis reveals where the money goes Instead of staring at logs, you get answers. ### Improve: Make Better LLM Features Loop gives you a structured, data-driven way to improve your AI system: - Remix traces with new prompts, models, or parameters - Compare outputs side-by-side - Use Prism AI for diagnostics, QA, and pattern detection Your entire optimization workflow becomes faster, clearer, and repeatable. ## Why It Matters Serious AI products need real observability. - Logs don't tell you how your model reasoned - Metrics don't explain why a prompt behaved differently - Dashboards don't help you compare two versions of a workflow Loop gives developers the observability and debugging superpowers that LLM applications demand. This is how reliable AI features get built — with clarity, not luck. ## Pricing & Availability Lens Loop launches today in a **limited Closed Beta**, with full live demos available at the Lens booth at Microsoft Ignite. Because this is a brand-new category, we want early adopters to experience the full power of Loop — and help shape the product as we prepare for GA. ### Free for Your First Year Closed Beta participants receive **one full year of Loop Pro at no cost** — the complete product with no limitations. This includes: - Full LLM trace visibility - Cost, latency, token analysis - Replay & comparison - Prism AI - Local + remote capture via Loop Server No lite version. No paywalls. Just the full experience — in exchange for your feedback. For deeper feature-by-feature breakdowns, visit our [website](https://lenshq.io/products/lens-loop/). ### How to Request Closed Beta Access Loop is available today — but **access is limited**. This is your chance to: - Be among the first developers to use a new category of tool - Influence the direction of Loop before GA - Bring real observability to your AI development workflow - Get one year of Loop Pro completely free [Sign Up for Closed Beta](https://survey.refiner.io/eolx2e-mq825n) to request access. ## Ready to See Inside Your LLM Application? AI development is evolving fast — but developer tools haven't kept up. Lens Loop gives you the clarity you've never had before: full visibility, real understanding, and a systematic way to improve every part of an AI application. This is the start of a new category — **a power tool for LLM application developers.** Whether you're building your first AI feature or operating an LLM system at scale, Loop has one mission: **Turn your AI from a black box into a glass box.** Visit our website to [learn more](https://lenshq.io/products/lens-loop/) or [sign up for closed beta](https://survey.refiner.io/eolx2e-mq825n)!