FairStack vs Synthesia
Verified pricing -- last updated 2026-03-11
12 talking head models. Base model cost + a flat 20% platform fee, shown before you spend.
Synthesia sells avatar minutes on a monthly plan, and unused minutes reset. FairStack bills avatar video by the second, per model: HeyGen Avatar 4 is $0.12/s, so a one-minute video is 60s x $0.12/s = $7.20. 12 talking head models. No subscription.
12
Talking Head models
Flat 20%
Platform fee
144
Total models
None
Subscription
If you are here, this is probably why
Synthesia sells minutes on a plan and unused minutes reset. On FairStack you pay per second of output, at each model's rate, shown before you spend.
Synthesia Creator ($89/mo) just for API access. On FairStack the full API is on every account.
You want 12 talking head models, not just one proprietary engine
You need API access -- Synthesia gates it to enterprise customers
The short version
One minute of avatar video on HeyGen Avatar 4: 60s x $0.12/s = $7.20, billed per second.
Synthesia Starter is $29/month for 10 minutes, and unused minutes reset. A FairStack balance never expires.
12 talking head models -- MuseTalk, InfiniteTalk, Kling Avatar and more -- billed per second or per generation.
Plus 39 image + 62 video + 10 voice models. Synthesia is avatar-only.
Side-by-side overview
FairStack
Synthesia
Talking head models
12 models (audio-driven, lipsync)
1 proprietary avatar engine
1-min avatar video
60s x $0.12/s = $7.20 (HeyGen Avatar 4)
$2.90/min (Starter)
10 min/month
600s x $0.12/s = $72.00 (HeyGen Avatar 4)
$29/month (Starter)
API access
Full REST API, all users
Creator plan ($89/mo) minimum
Commitment
Top up a balance, no recurring charge
$29-89/month subscription
Unused balance expires
Never
Monthly (unused minutes lost)
Other modalities
Image, video, voice, music, 3D
Avatar video only
Why FairStack
HeyGen Avatar 4 at $0.12/s, billed per second of output, with the cost shown before you run it
12 talking head models -- not locked to one provider
Full REST API for all users -- no enterprise gate
No annual commitment -- top up a balance, pay per generation, and your balance never expires
Image (39) + video (62) + voice (10) + music (19) included
When Synthesia may still be the better choice
We believe in honesty. Here is where they have an edge.
If you need 150+ pre-built studio-quality avatars or custom AI avatars from video — Synthesia's avatar library is unmatched
If you need enterprise compliance features (SOC 2, GDPR tools, team management)
If you need Synthesia's built-in video editor with scenes, templates, and screen recording
Ready to try 12 talking head models?
Top up a balance and start generating. No subscription. See the exact cost before every generation.
Start CreatingFairStack is not affiliated with Synthesia Ltd.
Synthesia is a trademark of Synthesia Ltd.
Synthesia Starter: $29/mo, 10 min/mo. Per-minute: $29/10 = $2.90. Creator: $89/mo, 30 min/mo. Verified March 2026.
All pricing verified as of 2026-03-11. Pricing and features may change.