See where
delivery changes.
Compare a speech with its reference. Find the passage, hear the difference, and understand the numbers behind it.
Choose a comparison
Two public-domain JFK excerpts, with unchanged controls and intentionally modified volume, pauses and pace. Example results are precomputed; Reanalyze runs the real engine.
Compare your own recordings
Audio is decoded in your browser. On Analyze, a WAV copy and the transcript go to our Vercel function for this request. The app does not store uploads. Avoid confidential recordings. English word alignment is estimated and can be uncertain.
Delivery trace
This score measures similarity to one reference. A difference can be intentional. It is not an absolute quality rating, a content score, or a claim of fairness across speakers.
Your rehearsal intention
Listen to each flagged moment, then mark it as intentional or choose it for practice. These notes stay in this tab and do not change the similarity score. Changing recordings or reanalyzing clears them.
Energy, aligned in time
Moments to review
Word alignment
Measured differences.
Useful next questions.
FFT and MFCC features align the recordings. Energy, relative pitch and local pace reveal differences; word boundaries link them back to the transcript. Listen to a flagged passage before deciding what to change.
Inspect the dataset, rubric and evaluation