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An optional preview of a redesigned Fiddler interface for both your GenAI applications and your ML models. It uses your existing account and data — only the layout and navigation are new, and you can switch back anytime.

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Try It (and Switch Back)

  • Open it: add preview. to the front of your usual Fiddler address — for example, preview.your-company.cloud.fiddler.ai — and sign in as usual.
  • Switch back: remove preview. from the address. (There’s no in-app toggle — you just edit the URL.)

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Find Your Way Around

The left sidebar replaces the old top bar (light and dark themes available) and has two parts:
  • Top — your selected application or model. Pick one with the selector at the top of the sidebar, and its own pages appear right below it. For a GenAI application, these include Overview, Explorer, and Evaluator Rules. For an ML model, these include Overview, Dashboard, Schema, and Baselines. They stay put as you work, so you move between them without going back to a list. This is the biggest change — and the biggest click-saver.
  • Below — Workspace. The org-wide areas: Projects, Applications, Dashboards, Charts, Alerts, and more. Depending on your organization, Workspace can also include Mission Control (a cross-project overview for leadership, formerly “Executive Dashboard”) and a Predictive Models list.
The items you see depend on your organization’s settings and your permissions, so your sidebar may differ from the screenshots on this page.
The redesigned Fiddler left sidebar with an application selected: the application's own pages on top, and the org-wide Workspace areas below

The redesigned left sidebar. Top: your selected application and its own pages. Below, under Workspace: the org-wide areas. Your sidebar may differ.

The Mission Control page in the redesigned Fiddler UI on its GenAI view, showing app and trace totals, evaluator scores, and span traffic and token usage charts

Mission Control, with separate GenAI and ML views of your whole organization. Your sidebar may differ.

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Monitoring ML Models

  • Open a model: go to Projects, open a project, and select the model. If your organization has it turned on, the Predictive Models list under Workspace shows all your models in one place.
  • Investigate a change: open a monitoring chart and click any data point. A Root Cause Analysis panel opens below the chart, with Events, Analyze, Data Drift, and Data Integrity tabs.
  • Add a model: open an ML project and select Add Model.
The redesigned Fiddler sidebar with an ML model selected, next to the model's Overview page showing its columns, baselines, segments, and custom metrics

An ML model selected: the model's own pages on top, the org-wide Workspace areas below. Your sidebar may differ.

The Predictive Models list in the redesigned Fiddler UI, showing each model's onboarding date, column count, description, and project

The Predictive Models list. Your sidebar may differ.

A Feature Drift chart for an ML model with the Root Cause Analysis panel open below it on the Data Drift tab

Clicking a data point on a drift chart opens the Root Cause Analysis panel. The Data Drift tab ranks inputs by how much they drifted. Your sidebar may differ.

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Settings

Settings has four groups: Organization, Access Control, Configuration, and Integrations. API keys are under Settings → Credentials.

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What’s Not in the Preview Yet

For these, use your current Fiddler (remove preview. from the address):
  • Saved views: Bookmarks
  • Setting up ML models: draft models
  • Viewing ML models: a model’s Environments tab
  • GenAI applications: the Enrichments tab
Old links: most links from your current Fiddler open the same page in the preview. Some old links can’t point to an exact page, so they open a general page instead (such as the Charts or Applications list) or a “Page not found” screen. If that happens, look for the feature from there. If you can’t find it, it isn’t in the preview yet.
Not sure whether something’s available? Ask your Customer Success Manager.

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Tell Us What You Think

Your feedback shapes the final release — share it with your Fiddler Customer Success Manager.
Optional preview — features and layout may change; the product name is not final.