OmniHuman v1.5 vs Synthesia: Which AI Avatar Tool is Better?

Synthesia wants you to pick one of their 230+ stock avatars and start typing. OmniHuman v1.5 wants you to upload any photo - your CEO, your founder, a licensed actor, a custom persona - and turn it into a talking 30-second video for $7.20. That one difference defines almost everything else.

The Core Philosophy Gap

Synthesia built its platform around a library of pre-produced, consent-licensed stock avatars. You pick one, type your script, and Synthesia stitches together the talking video using pre-captured motion assets. It is predictable, it is enterprise-friendly, and it comes with bulletproof rights clearance because every avatar was filmed under contract.

OmniHuman v1.5 on Arteza goes the other way. You bring the photo. The model generates every frame from scratch based on that photo and your audio. The face is whoever you want it to be - your real founder, your brand mascot, a persona generated with Seedream.

Both approaches are legitimate. They serve different needs.

Feature-by-Feature Breakdown

Where Synthesia Is Strong

Synthesia has earned its enterprise reputation, and it shows in the details.

Stock avatar breadth. With 230+ pre-shot avatars, you can pick demographics, styles, and outfits without commissioning anything. For global brands making internal training where the face just needs to look professional, this is fast.

Built-in TTS in 140+ languages. Synthesia's integrated voice engine is one of the best in the category. Paste text, pick a voice, ship a video. No juggling third-party TTS.

Enterprise compliance. SOC2, GDPR, procurement questionnaires, SSO, centralized billing. Synthesia is built to pass a Fortune 500 security review. If your procurement team demands certifications, this matters.

Slide-to-video workflows. Synthesia's editor treats videos like PowerPoint slides, which fits how L&D teams already think.

Avatar rights clarity. Every stock avatar was filmed under contract with usage rights pre-cleared. Legal teams love this.

Where OmniHuman v1.5 Is Strong

Custom identity from a single photo. This is the headline win. If you need a specific person on camera - your actual CEO, a branded spokesperson, a recurring brand persona - OmniHuman generates them from one portrait. Synthesia's "custom avatar" tier requires a live filmed shoot, which takes days or weeks and costs extra.

Cheaper at low volume. At one video a month, Synthesia Starter costs $360/year. OmniHuman costs $86.40/year in credits for the same frequency. A 6x saving for occasional creators.

Phoneme-level lip sync. OmniHuman reads actual speech sounds and maps them to mouth shapes frame by frame. Synthesia's motion library is good, but its lip sync occasionally looks templated on close viewing.

Audio-driven gesture variation. Every OmniHuman video has motion that correlates with the specific audio you feed it. Synthesia avatars share motion assets, so two different videos from the same avatar can look noticeably similar.

Generated persona workflow. Pair OmniHuman with Seedream to create a brand character who never gets sick, never quits, and never ages out of your use case. Full character control.

The Cost Breakdown

Run your own numbers, but here's a representative set.

Casual user: 1 video/month

• Synthesia Starter ($30/mo): $360/year
• OmniHuman v1.5: $86.40/year
• Savings with OmniHuman: $244.80

Steady user: 4 videos/month

• Synthesia Starter ($30/mo): $360/year (if within minute cap)
• OmniHuman v1.5: $7.20 x 48 = $345.60/year
• Synthesia wins by: $100.80 if you stay within allowance

Training team: 15 videos/month

• Synthesia Creator ($90/mo): $1,080/year
• OmniHuman v1.5: $7.20 x 180 = $1,296/year at the base rate, less on a monthly plan
• Synthesia wins by: $360-$648 depending on credit tier

Project-based user: 10 videos in one month, then dormant for 6 months

• Synthesia: $180 (maintained for 6 months) + reactivation
• OmniHuman v1.5: $7.20 x 10 = $72, then $0
• OmniHuman saves: $84+

The pattern: Synthesia amortizes well under steady use. OmniHuman wins whenever your usage is spiky, low, or project-based.

Ready to try OmniHuman v1.5? Start creating free →

Want a presenter like this? Try OmniHuman free →

Custom Avatar Depth

Both platforms support "custom" avatars, but the process and flexibility differ wildly.

Synthesia Custom Avatar:

• Requires a live filmed studio shoot (self-service or in-person)
• Takes 2-4 weeks for processing
• Costs extra (often $1,000+ per avatar on some tiers)
• Results in a new stock-style avatar locked to your account
• Re-shoots needed for new wardrobes or looks

OmniHuman v1.5 Custom Avatar:

• Upload a single portrait photo
• Usable immediately, no studio session
• Costs only the $0.30-$7.20 per video
• Swap photos freely between videos - same person in different contexts, or different people entirely
• Generate personas with Seedream and use them within minutes

For teams that want a single named brand spokesperson across all content, Synthesia's custom tier gives a polished, consistent look. For teams that want flexibility, speed, or multiple personas, OmniHuman wins.

Video Quality Comparison

Both tools produce professional output. Key differences:

Lip sync on fast speech. OmniHuman's phoneme-level approach holds up on rapid-fire dialogue better than Synthesia's motion library.

Gesture repetition. Watch two Synthesia videos from the same avatar back to back and you may notice repeating hand and head movements. OmniHuman generates fresh motion per video.

Identity fidelity. OmniHuman reproduces specific faces with high accuracy. Synthesia gives you a clean version of a stock person, which is fine if "a professional-looking presenter" is the goal.

Background flexibility. Synthesia offers click-to-swap backgrounds. OmniHuman uses a prompt to describe the scene, which is more flexible but less point-and-click.

Who Should Use Each Tool

Pick Synthesia if:

• You need enterprise compliance (SOC2, SSO, GDPR-first procurement)
• You produce high steady volume of training content
• Your content needs built-in TTS across many languages
• Legal requires pre-cleared avatar rights
• You prefer a slide-based editor

Pick OmniHuman v1.5 if:

• You need specific custom faces without a studio shoot
• Your monthly volume is low, spiky, or project-based
• You want to iterate quickly on different personas
• Phoneme-accurate lip sync is critical
• You value pay-per-use over subscriptions

Many teams use both: Synthesia for templated internal training and OmniHuman for hero marketing videos with custom spokespeople.

Try OmniHuman v1.5 Today

For less than a single month of Synthesia Starter, you can run a full head-to-head test.

1. Sign up for Arteza and get 10 free credits
2. Subscribe to the $5 Starter plan for 60 credits
3. Prep a photo and audio file
4. Open OmniHuman v1.5
5. Generate and compare

For more reading, see the OmniHuman v1.5 complete guide, the pricing deep-dive, and comparisons against HeyGen and D-ID.

Ready to try OmniHuman v1.5? Start creating free →