{"observation":{"id":"b2ef26b2-2972-4c88-96b0-547d48165f9f","tool":"synthesia","tool_name":"Synthesia","criterion":"voice-quality","criterion_name":"Voice quality","criterion_definition":"Natural-sounding voice that matches the avatar, with correct emphasis and a convincing real-creator feel.","criterion_evidence_type":"transformation","criterion_rank_role":"decisive","criterion_rank_role_reason":"A convincing, natural voice is part of whether the ad feels like a real creator video rather than AI output. (3 of 3 judges)","scenario":"duolingo-mobile-app","scenario_name":"Duolingo – Mobile App","group_tag":"ugc-style-video-ads","scenario_description":"A short-form UGC promo prompt for a consumer mobile app, designed to test whether the tool can explain app benefits simply and persuasively while generating a realistic AI-presenter video.","modality":"mixed","input_text":"Product URL: https://www.duolingo.com/\n\nExact script:\nHook: Learning a new language has never been this easy.\nScript: I've been using Duolingo for a few minutes every day, and it's made language learning simple and fun. The short lessons are easy to follow, and the daily practice keeps me motivated. If you're planning to learn a new language, give Duolingo a try.\n\nOutput requirements:\n- Vertical (9:16)\n- 20–30 seconds\n- UGC-style AI presenter\n- Natural AI voice\n- Captions enabled","input_artifact_refs":[],"stresses":["Mobile app understanding","Consumer app promotion","Script quality","Avatar realism","Voice quality","Caption quality","Overall ad readiness"],"verdict":"worked","score":null,"score_total":null,"note":"The Duolingo voice was reported as clear and well-paced, with no technical issues during generation.","evidence_state":"verified","source":null,"artifacts":[{"url":"https://cdn.futuresmart.ai/public/aidemos/ea4c634e3873477ba8e836f199738bcc.mp4?v=1","role":"output","alt":null}],"run_id":"9fdbb84b-4aa0-484d-8f89-5c46608019a5","study_title":"Generate UGC-Style Video Ads With AI Avatars","study_kind":"generation","research_task":"86baxegpg","tested_at":null,"completeness":"input-and-output","input":{"state":"text","text":"Product URL: https://www.duolingo.com/\n\nExact script:\nHook: Learning a new language has never been this easy.\nScript: I've been using Duolingo for a few minutes every day, and it's made language learning simple and fun. The short lessons are easy to follow, and the daily practice keeps me motivated. If you're planning to learn a new language, give Duolingo a try.\n\nOutput requirements:\n- Vertical (9:16)\n- 20–30 seconds\n- UGC-style AI presenter\n- Natural AI voice\n- Captions enabled","files":[],"modality":"mixed","stresses":["Mobile app understanding","Consumer app promotion","Script quality","Avatar realism","Voice quality","Caption quality","Overall ad readiness"]},"tool_page_slug":"synthesia","tool_url":"https://aidemos.com/tools/synthesia","permalink":"https://aidemos.com/evidence/b2ef26b2-2972-4c88-96b0-547d48165f9f","api_url":"https://ai.aidemos.com/v1/observations/b2ef26b2-2972-4c88-96b0-547d48165f9f"},"peers":[{"id":"e1c671b1-a7b3-43dc-934e-5e02e99928e0","tool":"akool","tool_name":"AKOOL","verdict":"worked","score":null,"score_total":null,"note":"Voice output stays consistent and stable across the video.","artifact_count":1,"thumbnail":"https://cdn.futuresmart.ai/public/aidemos/ada242395b9642fdacde72d4547aafe9.mp4?v=1","evidence_url":"https://aidemos.com/evidence/e1c671b1-a7b3-43dc-934e-5e02e99928e0"},{"id":"06a249c8-9fd8-43fe-925f-daff45d3329e","tool":"topview-ai","tool_name":"Topview AI","verdict":"worked","score":null,"score_total":null,"note":"The voice stayed consistent and understandable across the video.","artifact_count":2,"thumbnail":"https://cdn.futuresmart.ai/public/aidemos/804557dc8e114b7b881b3057d7014c4f.mp4?v=1","evidence_url":"https://aidemos.com/evidence/06a249c8-9fd8-43fe-925f-daff45d3329e"},{"id":"8218446d-74df-47aa-92fa-b7a69a619ce0","tool":"vidnoz-ai","tool_name":"Vidnoz AI","verdict":"worked","score":null,"score_total":null,"note":"Generates a stable voice performance that remains consistent across the clip and fits the educational-app style prompt.","artifact_count":1,"thumbnail":"https://cdn.futuresmart.ai/public/aidemos/f25b8326c2154e5688b7d75b8d2dc085.mp4?v=1","evidence_url":"https://aidemos.com/evidence/8218446d-74df-47aa-92fa-b7a69a619ce0"}],"other_criteria":[{"id":"579419d7-0f47-43cb-8d1b-1536ddea14c4","criterion":"ad-readiness","criterion_name":"Ad-readiness","rank_role":"decisive","verdict":"failed","score":null,"score_total":null,"note":"The Duolingo ad was not runnable as-is because downloading required an upgraded plan and the output stayed landscape instead of vertical.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/579419d7-0f47-43cb-8d1b-1536ddea14c4"},{"id":"a822e15b-a091-4f92-8344-d0bf07c19660","criterion":"avatar-realism","criterion_name":"Avatar realism","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"The Duolingo output used a smooth, centered talking-head avatar, and the report says lip-sync accuracy was maintained.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/a822e15b-a091-4f92-8344-d0bf07c19660"},{"id":"f410dd67-fcba-4ee3-ac8e-1336e9dd7204","criterion":"platform-formats","criterion_name":"Platform formats","rank_role":"context","verdict":"failed","score":null,"score_total":null,"note":"The Duolingo output was generated in landscape rather than the requested vertical 9:16 short-form format.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/f410dd67-fcba-4ee3-ac8e-1336e9dd7204"},{"id":"b90aa48d-0aa8-4205-a720-db42358970da","criterion":"script-quality-persuasiveness","criterion_name":"Script quality & persuasiveness","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"The Duolingo script explained the app benefits clearly, but the report says the presentation felt less engaging for UGC ads and had limited emotional expressiveness.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/b90aa48d-0aa8-4205-a720-db42358970da"}],"appears_in":[{"page_type":"ranking","slug":"ugc-video-ad-generators","title":"Best AI Tools for Generating UGC-Style Video Ads With AI Avatars","url":"https://aidemos.com/best/ugc-video-ad-generators","binding":"run"}],"same_scenario":[{"id":"e1c671b1-a7b3-43dc-934e-5e02e99928e0","tool":"akool","tool_name":"AKOOL","verdict":"worked","score":null,"score_total":null,"note":"Voice output stays consistent and stable across the video."},{"id":"06a249c8-9fd8-43fe-925f-daff45d3329e","tool":"topview-ai","tool_name":"Topview AI","verdict":"worked","score":null,"score_total":null,"note":"The voice stayed consistent and understandable across the video."},{"id":"8218446d-74df-47aa-92fa-b7a69a619ce0","tool":"vidnoz-ai","tool_name":"Vidnoz AI","verdict":"worked","score":null,"score_total":null,"note":"Generates a stable voice performance that remains consistent across the clip and fits the educational-app style prompt."}]}