Synthesia alternatives with an API: access, pricing, limits
Argil, Creatify, HeyGen and Sume each document an avatar video API. They differ in how API access is sold, the price unit and the length limits.
Synthesia alternatives that document a public avatar video API include Argil, Creatify, HeyGen and Sume. All four turn a script into a video of an AI presenter; they differ in how API access is sold (a subscription plan, pay-as-you-go credits, or a per-second wallet) and in the unit you pay per.
The table lists each vendor's own terms, read on 2026-09-28, alphabetically and without a ranking. Sume's rows come from Generate avatar video and its pricing code. The same question from the HeyGen side is answered in HeyGen alternatives with an API.
How do Synthesia alternatives with an API compare?
The two things that change when you leave Synthesia's API are who can buy access and what a minute costs. What each tool needs from you to build a custom avatar (a photo, a clip or longer footage) has its own comparison.
| Tool | How API access is sold | Avatar video price |
|---|---|---|
| Argil | Classic plan or above; the API shares the plan's credits | 160 credits per minute of video, 20 per minute of voice, and a 20-credit royalty per video on Argil's v1 avatars (none on your own trained clone) |
| Creatify | API plans: API Starter $99 a month for 500 credits, API Pro $299 a month for 2,000 | AI Avatar 5 credits per 30 seconds; Aurora (photo plus audio) 1 credit per second |
| HeyGen | Pay-as-you-go API credits in USD, separate from its subscriptions | $0.60 to $7.20 per minute by engine and avatar type, charged by actual seconds |
| Sume | Usage draws from one prepaid wallet | $0.184/s standard, $0.245/s plus, $0.55/s max (no product image), plus a 5.5% agent fee by default |
| Synthesia (for reference) | Creator plan or above | 75 plan credits per minute of API usage on self-serve plans |
Which alternative fits which need?
- Pick Argil if you want API and app use to draw on the same plan credits, and you do not want to pay a royalty on a presenter you trained yourself.
- Pick Creatify if you make ads from product pages or reference ads and a fixed monthly credit plan fits your volume. See Creatify API.
- Pick HeyGen if you want to buy API usage without a subscription or want a real-time avatar. See HeyGen API pricing.
- Pick Sume if you generate short clips from your own backend and want per-second billing, with an optional product image.
- Stay on Synthesia if one video runs long with many scenes: its docs allow up to 150 scenes of up to 5 minutes each, 4 hours in total.
Which ones have a real-time, interactive avatar?
HeyGen (LiveAvatar) and Synthesia (Interactive Avatars) both sell one, priced apart from their video APIs; HeyGen vs Synthesia compares the two. Sume renders avatar video as asynchronous jobs that you poll or take by webhook, per the Sume API reference, so it is not a real-time alternative.
What are Sume's limits as a Synthesia alternative?
- One talking-video job covers a script Sume estimates at 4–60 seconds. For longer videos, see AI avatar video longer than 60 seconds.
- 720p is the documented resolution, in 1:1, 3:4, 9:16, 4:3 or 16:9.
- One avatar per final video in current execution.
- The avatar speaks English only in current code. What languages can an AI avatar speak covers the TTS and lip-sync route for other languages.
Sources
- Argil API pricing (read 2026-09-28)
- Argil API introduction (read 2026-09-28)
- Creatify API billing (read 2026-09-28)
- HeyGen API pricing explained (read 2026-09-28)
- HeyGen developer docs index (read 2026-09-28)
- Synthesia Video API introduction (read 2026-09-28)
- Synthesia: credits on self-serve plans (read 2026-09-28)
- Synthesia video creation (read 2026-09-28)
- Synthesia Interactive Avatars (read 2026-09-28)
- Generate avatar video
- Sume API reference
- Sume API pricing
Related posts
More in Sume Avatar 1.0
- Synthesia personal avatar vs studio avatar: what differs
A Synthesia personal avatar is self-serve, from one photo, ready in minutes; a studio avatar is a green-screen shoot sold as a paid add-on.
- Talking head vs B-roll: what's the difference?
A talking head is the shot of someone speaking to camera; B-roll is the footage you cut to while their voice keeps playing. How the two fit together.
- UGC video prompt for AI avatars: what goes in each field
A UGC video prompt for an AI avatar is three inputs, not one: the creator's words, a scene prompt for the setting and light, and a product image.
- What is a talking head video? Meaning and how to make one
A talking head video shows one person speaking to the camera, framed from about the chest up. What it means, what it's for, and how AI makes one.
Written by Sume