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Once you’ve run a suite a few times, the reports pile up: one JSON per run, in a directory, with no easy way to see them together. multivon-eval view already renders a single report as HTML. Point it at a directory instead and you get an index, click-through, and a diff. Shipped in 0.15.0. It runs on the same stdlib HTTP server view already uses — read-only, local, no new dependencies, fully offline. 
multivon-eval view --dir runs/           # browse a folder of reports
multivon-eval view runs/                 # same thing — a directory enters directory mode
multivon-eval view --dir runs/ --recursive   # walk subdirectories too (off by default)

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INDEX

The landing page is a sortable table of every eval-report JSON in the directory: suite, model, when, n, pass rate with a Wilson CI bar, error and flaky badges, and cost. A structural validator decides what counts as a report — a file needs the real {summary.pass_rate, cases[]} shape to make the table. Anything that doesn’t collapses into one “k files skipped” line rather than being parsed as an empty report. Runs with an error rate at or above 10% are flagged.

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OPEN

Click any row to open that report at /r/<idx>, served by the same EvalReport.to_html() that renders a single file, with a breadcrumb back to the index. There’s no second renderer to drift out of sync.

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DIFF

Pick two runs and /diff?a=&b= wraps report_a.compare(report_b): pass-rate and avg-score deltas, McNemar p with a significance label, and four buckets — Regressed, Fixed, Still failing, Unchanged. Regressed rows stack both runs’ judge reasons (matched by case input) as prose, so you read exactly why a verdict flipped instead of guessing.

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Single-file view is unchanged

multivon-eval view results.json
A single JSON path still renders one report exactly as before. Only a directory (or --dir) switches into browser mode.