Evidence · first-party tested/Best AI Tools for Generating UGC-Style Video Ads With AI Avatars

This is the only run that delivers the requested full-bleed vertical 9:16 frame with no letterboxing.

✓ Worked🧾 artifact-verifiedinput + output shownTest date not recordedHeyGen →

What was measured

Platform formats

Correct aspect ratios and lengths for each channel or short-form platform.

context, not decisivetransformation

Aspect ratios and length presets are delivery convenience; they matter, but they do not by themselves make the ad better or worse. (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.Caption quality◐ MixedCaptions 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.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: 7e43c5e4-07e8-4b3b-8141-9f792f225667
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

JSON · ai.aidemos.com/v1/observations/7e43c5e4-07e8-4b3b-8141-9f792f225667

Free with attribution.

Same input, same check — 2 other tools

measured on Platform formats

JoggAI◐ MixedThe export format is correct at full-bleed vertical 9:16 (1080×1920), but the clip is only 13.5 seconds long, below the requested 20–30 second range.Synthesia✗ FailedThe Duolingo output was generated in landscape rather than the requested vertical 9:16 short-form format.

This evidence is published in

Best AI Tools for Generating UGC-Style Video Ads With AI Avatars →

Real inputs and real outputs, no retouching · every cell queryable via API & MCP · aidemos.com