{"observation":{"id":"03d5ccd4-d2d5-4ec2-8443-8900e80b640c","tool":"heygen","tool_name":"Heygen","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","criterion_definition":"Does the dubbed voice sound natural, and does it match the original speaker's energy, tone, and style?","criterion_evidence_type":"transformation","criterion_rank_role":"decisive","criterion_rank_role_reason":"The product here depends on the dubbed voice sounding natural and resembling the original speaker, so weak voice cloning directly hurts the core task. (3 of 3 judges)","scenario":"hindi-vlog-style-talking-head-hindi-english","scenario_name":"Hindi vlog-style talking head (Hindi → English)","group_tag":"video-translation-voice-clone-lip-sync","scenario_description":"A casual Hindi/Hinglish talking-head or vlog-style creator video translated into English to stress informal language handling, slang, and natural-sounding voice cloning on real creator content.","modality":"video","input_text":null,"input_artifact_refs":[],"stresses":[],"verdict":"struggled","score":null,"score_total":null,"note":"The dubbed voice does not fully match the speaker's casual conversational tone.","evidence_state":"verified","source":"first-party","artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/heygen-free-copyright-stock-videos-images-and-music-publer-com-online-video-cutter-com.mp4","role":"input","alt":"HeyGen — Free Copyright Stock Videos Images And Music.publer.com (online-video-cutter.com).mp4"}],"run_id":"9feca581-b454-4bda-a610-a646cd0092f0","study_title":"Translate Videos with Voice Cloning and Lip Sync Using AI","study_kind":"backfill","research_task":"86b96dfpf","tested_at":"2026-06-24T05:45:24.018000+00:00","completeness":"input-only","input":{"state":"not-captured","text":null,"files":[],"modality":"video","stresses":[]},"tool_page_slug":"heygen","tool_url":"https://aidemos.com/tools/heygen","permalink":"https://aidemos.com/evidence/03d5ccd4-d2d5-4ec2-8443-8900e80b640c","api_url":"https://ai.aidemos.com/v1/observations/03d5ccd4-d2d5-4ec2-8443-8900e80b640c"},"peers":[{"id":"be692751-8937-4f24-b417-17444353cf60","tool":"dubverse","tool_name":"Dubverse","verdict":"worked","score":null,"score_total":null,"note":"Produces a natural, professional-sounding voice that fits neutral educational narration.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/dubverse-input-2-educational.mp4","evidence_url":"https://aidemos.com/evidence/be692751-8937-4f24-b417-17444353cf60"},{"id":"ed554b4b-daf1-40eb-87de-acd4682ef325","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"worked","score":null,"score_total":null,"note":"The dubbed voice was reported as very high quality: natural, human-like, expressive, and especially strong for energetic fitness instruction delivery.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/elevenlabs-input-1-fitness-video-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/ed554b4b-daf1-40eb-87de-acd4682ef325"},{"id":"5db79a49-a83d-41c0-9632-35eb8312e19e","tool":"rask-ai","tool_name":"Rask AI","verdict":"mixed","score":null,"score_total":null,"note":"Generates a generally natural Hindi dubbed voice, but some passages sound slightly robotic and do not fully capture the speaker's fitness energy or emotion.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/rask-ai-input-1-fitness-video-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/5db79a49-a83d-41c0-9632-35eb8312e19e"},{"id":"9b180883-0490-490d-873e-65b64726755c","tool":"sync-labs","tool_name":"Sync Labs","verdict":"mixed","score":null,"score_total":null,"note":"The dubbed voice is decent but still sounds AI-like and less natural than ElevenLabs, so the speaker match is only moderate.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/sync-labs-input-2-educational.mp4","evidence_url":"https://aidemos.com/evidence/9b180883-0490-490d-873e-65b64726755c"},{"id":"c32e56fb-f126-4c48-ae4f-6fa64b280f18","tool":"synthesia","tool_name":"Synthesia","verdict":"mixed","score":null,"score_total":null,"note":"The Spanish voice sounded natural and professional, but the report frames the workflow as avatar-based rather than source-speaker-based, so it does not demonstrate true original-speaker voice cloning.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/synthesia-input-2-educational.mp4","evidence_url":"https://aidemos.com/evidence/c32e56fb-f126-4c48-ae4f-6fa64b280f18"}],"other_criteria":[{"id":"3f569910-d750-4754-8623-e5774a7e1ddb","criterion":"lip-sync-accuracy","criterion_name":"Lip Sync Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Lip sync is acceptable, but it weakens on longer sentences.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/3f569910-d750-4754-8623-e5774a7e1ddb"},{"id":"f4949e27-0bf2-4547-abca-fd6137d92fe6","criterion":"lip-sync-accuracy","criterion_name":"Lip Sync Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Keeps lip movements mostly aligned, but synchronization becomes slightly inconsistent during fast speech.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/f4949e27-0bf2-4547-abca-fd6137d92fe6"},{"id":"9640f541-5757-44ef-b97a-4acbf459fe62","criterion":"lip-sync-accuracy","criterion_name":"Lip Sync Accuracy","rank_role":"decisive","verdict":"struggled","score":null,"score_total":null,"note":"Lip sync becomes noticeably less accurate and falls out of alignment in some sections.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/9640f541-5757-44ef-b97a-4acbf459fe62"},{"id":"ea512218-b5f2-4cc1-bbda-d81fec54ede7","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Produces mostly accurate English→Spanish translation for structured educational narration.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/ea512218-b5f2-4cc1-bbda-d81fec54ede7"},{"id":"c2fcd871-7f4f-4820-94c7-92f755da2835","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Produces a semantically accurate English→Hindi translation that preserves the energetic fitness tone.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/c2fcd871-7f4f-4820-94c7-92f755da2835"},{"id":"35c74480-d28a-4b69-b1ff-ddf6adb189a4","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Produces an understandable English translation, but it becomes literal and loses natural conversational flow.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/35c74480-d28a-4b69-b1ff-ddf6adb189a4"}],"appears_in":[{"page_type":"ranking","slug":"ai-video-dubbing-tools","title":"Best AI Tools to Translate Videos with Voice Cloning and Lip Sync","url":"https://aidemos.com/best/ai-video-dubbing-tools","binding":"run"}],"same_scenario":[{"id":"be692751-8937-4f24-b417-17444353cf60","tool":"dubverse","tool_name":"Dubverse","verdict":"worked","score":null,"score_total":null,"note":"Produces a natural, professional-sounding voice that fits neutral educational narration."},{"id":"ed554b4b-daf1-40eb-87de-acd4682ef325","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"worked","score":null,"score_total":null,"note":"The dubbed voice was reported as very high quality: natural, human-like, expressive, and especially strong for energetic fitness instruction delivery."},{"id":"5db79a49-a83d-41c0-9632-35eb8312e19e","tool":"rask-ai","tool_name":"Rask AI","verdict":"mixed","score":null,"score_total":null,"note":"Generates a generally natural Hindi dubbed voice, but some passages sound slightly robotic and do not fully capture the speaker's fitness energy or emotion."},{"id":"9b180883-0490-490d-873e-65b64726755c","tool":"sync-labs","tool_name":"Sync Labs","verdict":"mixed","score":null,"score_total":null,"note":"The dubbed voice is decent but still sounds AI-like and less natural than ElevenLabs, so the speaker match is only moderate."},{"id":"c32e56fb-f126-4c48-ae4f-6fa64b280f18","tool":"synthesia","tool_name":"Synthesia","verdict":"mixed","score":null,"score_total":null,"note":"The Spanish voice sounded natural and professional, but the report frames the workflow as avatar-based rather than source-speaker-based, so it does not demonstrate true original-speaker voice cloning."}]}