Captions are present, but around 0:04-0:05 they overlap with a leftover badge graphic and become garbled, creating hard-to-read double-exposed text.
What was measured
Caption quality
Accurate, well-timed captions with appropriate, on-trend styling.
decisive for this rankingtransformation
Accurate, well-timed captions are part of the finished ad and affect clarity and performance on social platforms. (3 of 3 judges)
What was given, what came back
Test input: Duolingo – Mobile App · mixed · group: ugc-style-video-ads
Input — what we sent
Input, verbatim
Product URL: https://www.duolingo.com/ Exact script: Hook: Learning a new language has never been this easy. Script: 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. Output requirements: - Vertical (9:16) - 20–30 seconds - UGC-style AI presenter - Natural AI voice - Captions enabled
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.
Why this input is hard
- · Mobile app understanding
- · Consumer app promotion
- · Script quality
- · Avatar realism
- · Voice quality
- · Caption quality
- · Overall ad readiness
Output — unretouched
Also checked on this input — same tool, 5 other criteria
Avatar realism✓ WorkedThe Duolingo output reads as a casual creator-style presenter rather than an AI-obvious stock avatar, with the report calling the setting genuinely UGC-authentic.B-roll / product integration✗ FailedThe supporting footage is not product-integrated because the cutaway uses the wrong app entirely, so the B-roll does not match the Duolingo testimonial being spoken.Platform formats✓ WorkedThis is the only run that delivers the requested full-bleed vertical 9:16 frame with no letterboxing.Product understanding✗ FailedProduct understanding breaks in the B-roll cutaway: the phone screen shows a shopping app ('NEW YORK BAG $219, ADD TO CART') instead of Duolingo or any language-learning interface.Script quality & persuasiveness✓ WorkedThe script is delivered verbatim from start to finish and lands on a natural CTA, ending correctly on 'give Duolingo a try.'
Provenance
- Observation
- 563c5021-098b-4a1f-b449-465d7e93d46c
- Evidence run
- 9fdbb84b-4aa0-484d-8f89-5c46608019a5
- Study
- Generate UGC-Style Video Ads With AI Avatars
- Research task
- 86baxegpg
- Tested at
- not recorded
- Source
- first-party
- Evidence state
- verified
- Proof shown
- input + output shown
- Cost / latency
- not captured
- Repeat run
- not captured
- Tester
- not captured
The last three rows are honest blanks, not placeholders — our capture has no field for them yet.
Query this
get_evidence({
tool: "heygen",
scenario: "ugc-style-video-ads"
})MCP · mcp.aidemos.com/api/mcp
Free with attribution.
Same input, same check — 3 other tools
measured on Caption quality
Invideo AI◐ MixedThe captions visibly advance across the clip and support the CTA line, but the report does not separately validate timing or styling beyond the sampled frame progression.JoggAI✗ FailedThe tool can export a clip with zero on-screen captions for the full 13.5 seconds, so subtitles are absent even on a mobile-app promo.Topview AI✓ WorkedCaptions were generated and readable.
This evidence is published in
Real inputs and real outputs, no retouching · every cell queryable via API & MCP · aidemos.com