{ "schemaVersion": 1, "publishedAt": "2026-07-21", "page": "https://audiowrench.com/benchmarks/", "result": "PASS", "summary": "14 AudioWrench tools currently have published end-to-end functional evidence in this benchmark hub.", "methodology": { "functional": "A real local fixture is selected in Chromium and the primary workflow is completed. Outputs and relevant claims are checked, while fetch, XHR, WebSocket, EventSource and cross-origin requests are recorded.", "source": "The visible controls, processing path, output format, dependencies, data flow and limits are reviewed against the current implementation.", "smoke": "The canonical page is opened through the production-like Cloudflare Pages runtime and checked for startup, runtime and accessibility failures. This does not prove transformation accuracy." }, "suites": [ { "id": "functional-workflow-and-network-observation", "testedAt": "2026-07-21T02:18:52.218Z", "browser": "Chromium 149.0.7827.55", "source": "/assets/evidence/tool-privacy-audit.json", "result": "PASS", "results": [ { "slug": "autotune", "name": "Auto-Tune", "toolUrl": "/tools/autotune", "title": "Pitch-correction workflow", "question": "Can the tool analyse an intentionally off-pitch monophonic fixture, correct it to C major and export a readable WAV?", "fixture": "demo-vocal.wav", "fixtureUrl": "/assets/demo-vocal.wav", "inputBytes": 352844, "workflowMs": 1327, "observed": "42 of 45 analysed segments were corrected to C major and the exported 333,272-byte WAV passed the file check.", "limitation": "This fixture tests one short synthetic monophonic voice. It is not an accuracy score for every singer, key or recording condition.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS" }, { "slug": "flac-cover-art", "name": "FLAC Cover Art", "toolUrl": "/tools/flac-cover-art", "title": "FLAC picture-block workflow", "question": "Can the tool add a front-cover picture while preserving the compressed FLAC audio payload byte for byte?", "fixture": "demo-flac-cover-art.flac", "fixtureUrl": "/assets/demo-flac-cover-art.flac", "inputBytes": 743731, "workflowMs": 208, "observed": "The exported FLAC contained a type-3 front-cover picture and retained the original compressed audio payload byte for byte.", "limitation": "The fixture covers one valid FLAC structure and one front-cover replacement path, not every malformed or unusual metadata layout.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS" }, { "slug": "soundboard", "name": "Soundboard", "toolUrl": "/tools/soundboard", "title": "Soundboard backup workflow", "question": "Can the tool load a local pad and export a readable one-pad JSON board backup?", "fixture": "demo-music.wav", "fixtureUrl": "/assets/demo-music.wav", "inputBytes": 1058444, "workflowMs": 260, "observed": "The six-second fixture loaded into one pad and the exported one-pad JSON backup passed the structure check.", "limitation": "This result covers one pad and one backup export. Storage capacity and playback latency still depend on the browser and device.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS" }, { "slug": "granular", "name": "Granular Synthesizer", "toolUrl": "/tools/granular", "title": "Granular capture workflow", "question": "Can the granular instrument load a local fixture, render a short capture and export a readable WAV?", "fixture": "demo-music.wav", "fixtureUrl": "/assets/demo-music.wav", "inputBytes": 1058444, "workflowMs": 1105, "observed": "The tool captured 0.7 seconds of granular output and exported a valid 138,284-byte WAV.", "limitation": "Granular scheduling is intentionally stochastic, so this verifies the workflow and file output rather than a fixed artistic result.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS" }, { "slug": "spectrogram", "name": "Spectrogram Analyzer", "toolUrl": "/tools/spectrogram", "title": "Spectrogram export workflow", "question": "Can the analyser load a local audio fixture, draw its spectrum and export a readable PNG?", "fixture": "demo-music.wav", "fixtureUrl": "/assets/demo-music.wav", "inputBytes": 1058444, "workflowMs": 1695, "observed": "The six-second fixture loaded and the visible spectrogram exported as a valid 10,037-byte PNG.", "limitation": "This published case covers the live analyser viewport. The separate full-file mode has a targeted regression test, but neither mode is a calibrated laboratory spectrometer or SPL meter.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS" } ] }, { "id": "synthetic-analysis-and-normalization-wave2", "testedAt": "2026-07-15T16:52:36.119Z", "browser": "Chromium 149.0.7827.55", "source": "/assets/evidence/functional-benchmark-wave2.json", "fixtureManifest": "/assets/benchmark-fixtures/wave2-manifest.json", "license": "CC0-1.0", "result": "PASS", "results": [ { "slug": "bpm-detector", "name": "BPM Detector", "toolUrl": "/tools/bpm-detector", "title": "Known-tempo detection matrix", "question": "Can the real UI recover controlled 80, 100, 128 and 160 BPM pulse trains and disclose its intentional half/double-time folding at 60 and 200 BPM?", "fixture": "6 deterministic CC0 WAV fixtures", "fixtureUrl": "/assets/benchmark-fixtures/wave2-manifest.json", "inputBytes": 2304264, "workflowMs": null, "caseCount": 6, "observed": "All 6 cases passed. Exact grid: 80→80 BPM, 100→100 BPM, 128→127.7 BPM, 160→160 BPM. Declared half/double-time interpretations: 60→120 BPM, 200→100 BPM.", "limitation": "These fixtures are steady synthetic click grids. Swing, syncopation, rubato, changing tempo and mastered music remain outside this wave.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave2.json" }, { "slug": "key-finder", "name": "Song Key Finder", "toolUrl": "/tools/key-finder", "title": "Authored key and Camelot matrix", "question": "Can the browser-resampled analyser return the exact authored tonic, major/minor mode and Camelot code for six deterministic chord progressions?", "fixture": "6 deterministic CC0 WAV fixtures", "fixtureUrl": "/assets/benchmark-fixtures/wave2-manifest.json", "inputBytes": 2880264, "workflowMs": null, "caseCount": 6, "observed": "All 6 authored progressions matched exact tonic, mode and Camelot code: C major (8B), D major (10B), F major (7B), G major (9B), A minor (8A), E minor (9A).", "limitation": "Six clean triad progressions do not establish accuracy for modal, atonal, noisy, sparse or changing-key recordings. Treat every real-song result as an estimate.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave2.json" }, { "slug": "loudness-normalizer", "name": "Loudness Normalizer", "toolUrl": "/tools/loudness-normalizer", "title": "Known-level LUFS and WAV workflow", "question": "Can the UI measure controlled signals, normalize them to -23 and -16 LUFS, re-measure the render and export a readable PCM16 WAV?", "fixture": "2 deterministic CC0 WAV fixtures", "fixtureUrl": "/assets/benchmark-fixtures/wave2-manifest.json", "inputBytes": 384088, "workflowMs": null, "caseCount": 2, "observed": "Both measurement, normalization and download workflows passed: -23 LUFS target → -23 LUFS in the UI, 384,044-byte WAV; -16 LUFS target → -16 LUFS in the UI, 384,044-byte WAV.", "limitation": "The fixtures are steady mono 1 kHz tones and the independent cross-check is not a certified broadcast meter. This wave covers sample peak, not true peak.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave2.json" } ] }, { "id": "deterministic-editing-and-conversion-wave3", "testedAt": "2026-07-15T17:38:31.263Z", "browser": "Chromium 149.0.7827.55", "source": "/assets/evidence/functional-benchmark-wave3.json", "fixtureManifest": "/assets/benchmark-fixtures/wave3-manifest.json", "license": "CC0-1.0", "result": "PASS", "results": [ { "slug": "converter", "name": "Audio Converter", "toolUrl": "/tools/converter", "title": "Format, channel and sample-rate conversion", "question": "Can the real UI turn a stereo 48 kHz WAV into a mono 22.05 kHz float32 WAV while preserving duration and both authored tones at the expected downmix levels?", "fixture": "1 deterministic CC0 WAV fixture", "fixtureUrl": "/assets/benchmark-fixtures/wave3-manifest.json", "inputBytes": 384044, "workflowMs": null, "caseCount": 1, "observed": "The two-second stereo fixture became a 22,050 Hz mono float32 WAV (176,444 bytes); both authored tones remained at the expected downmix levels.", "limitation": "This case covers WAV-to-WAV conversion, one downmix and one output rate. MP3 encoding and every browser-decodable input codec remain outside this wave.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave3.json" }, { "slug": "trimmer", "name": "Audio Trimmer", "toolUrl": "/tools/trimmer", "title": "Exact middle-selection trim and WAV export", "question": "Can the real waveform handles keep exactly 1.00–3.00 seconds of a four-segment fixture and exclude the authored outer tone segments from the downloaded WAV?", "fixture": "1 deterministic CC0 WAV fixture", "fixtureUrl": "/assets/benchmark-fixtures/wave3-manifest.json", "inputBytes": 384044, "workflowMs": null, "caseCount": 1, "observed": "The visible handles selected 1.00–3.00 seconds and exported an exact 2.00-second PCM16 WAV (192,044 bytes) containing the 330/440 Hz middle segments with no measured 220/660 Hz leakage.", "limitation": "This case covers keep-selection with zero fades and pointer-position handles. Remove mode, fades and touch-specific gestures remain outside this wave.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave3.json" }, { "slug": "joiner", "name": "Audio Joiner", "toolUrl": "/tools/joiner", "title": "Reordered two-file join with crossfade", "question": "Can the real UI reorder two decoded files, apply a 100 ms crossfade and export the expected sequence, duration and AudioContext-rate WAV?", "fixture": "2 deterministic CC0 WAV fixtures", "fixtureUrl": "/assets/benchmark-fixtures/wave3-manifest.json", "inputBytes": 134488, "workflowMs": null, "caseCount": 1, "observed": "After the visible reorder and 100 ms crossfade, the 1.7-second WAV followed the 660→330 Hz sequence at 48,000 Hz (163,244 bytes).", "limitation": "This case covers two mono inputs, one reorder and one crossfade. Chromium decodes both source rates to its AudioContext rate before the joiner sees them; larger queues, channel expansion and clipping control remain outside this wave.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave3.json" } ] }, { "id": "deterministic-local-separation-and-denoising-wave4", "testedAt": "2026-07-15T19:32:16.871Z", "browser": "149.0.7827.55", "source": "/assets/evidence/functional-benchmark-wave4.json", "fixtureManifest": "/assets/benchmark-fixtures/wave4-manifest.json", "license": "CC0-1.0", "result": "PASS", "results": [ { "slug": "vocal-remover", "name": "Vocal Remover", "toolUrl": "/tools/vocal-remover", "title": "Instant mid/side vocal-separation matrix", "question": "Can the real UI route a controlled centred vocal and anti-phase side signal into instrumental and acapella WAV outputs without invoking the optional neural model?", "fixture": "1 deterministic CC0 WAV fixture", "fixtureUrl": "/assets/benchmark-fixtures/wave4-manifest.json", "inputBytes": 576044, "workflowMs": null, "caseCount": 2, "observed": "Both instant-DSP exports passed: instrumental vocal/side ratio 0.028881, acapella side/vocal ratio 0.000002, with no neural-model request.", "limitation": "These cases cover the instant phase-DSP engine on one synthetic stereo mix. They do not test the optional neural engine or establish separation quality for mastered songs.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave4.json" }, { "slug": "stem-splitter", "name": "Stem Splitter", "toolUrl": "/tools/stem-splitter", "title": "Four-stem routing and reconstruction workflow", "question": "Can the real UI export bass, vocals, drums and other WAV stems with the expected authored routing and a sample-level sum close to the input fixture?", "fixture": "1 deterministic CC0 WAV fixture", "fixtureUrl": "/assets/benchmark-fixtures/wave4-manifest.json", "inputBytes": 768044, "workflowMs": null, "caseCount": 1, "observed": "All four PCM16 WAV stems exported and summed back to the fixture with RMSE 0.00003146 and peak error 0.00009155; authored bass, vocal and transient/side routing checks passed.", "limitation": "The splitter is a frequency/transient heuristic, not an AI source-separation model. The fixture verifies deterministic routing and reconstruction, not perceptual isolation on real music.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave4.json" }, { "slug": "noise-remover", "name": "Noise Remover", "toolUrl": "/tools/noise-remover", "title": "Stationary-noise reduction and signal-retention workflow", "question": "Can the real UI learn a deterministic stationary noise floor, reduce broadband noise and hum, retain the authored speech-proxy tones and export a readable WAV?", "fixture": "1 deterministic CC0 WAV fixture", "fixtureUrl": "/assets/benchmark-fixtures/wave4-manifest.json", "inputBytes": 384044, "workflowMs": null, "caseCount": 1, "observed": "Default-strength cleanup reduced noise-only RMS by 40.39 dB and 120 Hz hum by 101.37 dB, retained 94.57% of the authored speech-proxy tones and improved SNR by 23.06 dB.", "limitation": "This case covers one seeded stationary noise profile and synthetic tones. It does not establish quality for changing noise, reverberation, overlapping voices or one-off sounds.", "payloadNetworkRequests": 0, "externalRequests": 0, "result": "PASS", "source": "/assets/evidence/functional-benchmark-wave4.json" } ] } ] }