Evidence · first-party tested/creatify-ai

The voice clarity and pacing were strong, making the spoken delivery easy to follow.

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

What was measured

Voice quality

Whether the generated voice sounds natural, matches the avatar, uses correct emphasis, and feels like a convincing real creator.

decisive for this rankingtransformation

A UGC ad depends on a natural-sounding creator voice; robotic delivery or bad emphasis directly undermines the ad’s effectiveness. (3 of 3 judges)

What was given, what came back

Test input: Nike Pegasus 41 – Physical Product · text

Input — what we sent

The exact prompt

Product URL: https://www.nike.com/t/pegasus-41-mens-road-running-shoes-LMhrRG/FD2722-002

Exact Script
Hook: These are my new favorite running shoes.
Script: I've been wearing the Nike Pegasus 41 for my daily runs, and they've been incredibly comfortable from day one. They're lightweight, well-cushioned, and great for everyday training. If you're looking for dependable running shoes, they're definitely worth considering.

Output Requirements
- Vertical (9:16)
- 20–30 seconds
- UGC-style AI presenter
- Natural AI voice
- Captions enabled

A short-form UGC-style testimonial ad prompt for a physical consumer product, designed to test product presentation, believable endorsement, and ad generation quality for e-commerce footwear.

Why this input is hard

· physical product understanding
· UGC testimonial quality
· product presentation
· avatar realism
· voice quality
· commercial ad readiness

Output — unretouched

Also checked on this input — same tool, 3 other criteria

Avatar realism✓ WorkedThe generated presenter remained professional and consistent, with accurate lip-sync in the previewed output.Platform formats✗ FailedThe output stayed in landscape orientation, which is not suitable for short-form social ads.Script quality & persuasiveness⚠ StruggledThe delivery lacked an informal creator-style tone and personalization, so it reads more like a polished spot than a believable UGC testimonial.

Provenance

Observation: 25654d37-e986-4d2d-b695-a472f4a7614b
Evidence run: f91a51ec-b400-46fe-97f5-7e779fe17532
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: "synthesia"
})

MCP · mcp.aidemos.com/api/mcp

JSON · ai.aidemos.com/v1/observations/25654d37-e986-4d2d-b695-a472f4a7614b

Free with attribution.

Same input, same check — 4 other tools

measured on Voice quality

Creatify.ai✓ WorkedThe voice sounds smooth, clear, and confident, which fits product-promotion content.Topview AI◐ MixedAudio is clear and consistent, but the low-energy delivery lacks the enthusiasm expected in a product ad.VEED✓ WorkedVoice delivery stayed stable and natural throughout the video.Vidnoz AI✓ WorkedThe narration remains stable and easy to understand throughout the product ad.

This evidence is published in

creatify-ai →synthesia →topview-ai →vidnoz-ai →

From the same study (page rebuilt from a later run)

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