kitio.aiCartesia Sonic vs AudioStack
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Cartesia Sonic starts at $5/mo and AudioStack starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Real-time speech under 90ms
- 44 languages
- Instant voice cloning
- Emotion and laughter control
- Voice localisation
- Brief to finished audio
- 2,600+ voices
- Multi-provider orchestration
- Variant generation at scale
- Self-serve console and embedding
| Feature | Cartesia Sonic | AudioStack |
|---|---|---|
| Best for | Low-latency text-to-speech API for voice agents | Agentic audio production platform for ads, publishers and media |
| Category | Audio & voice | Audio & voice |
| Pricing model | Freemium | Paid |
| Starting price | $5/mo | See pricing page |
| Free plan | Yes | No |
| Made by | Cartesia | AudioStack |
| Based in | United States | United Kingdom |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Cartesia Sonic starts at $5/mo and AudioStack starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
Free
Free
- 20K credits per month
- Text to speech and speech to text
- $1 of prepaid voice agent usage
Pro
$5/mo
- 100K credits per month
- Commercial use license
- Instant voice cloning
Startup
$49/mo
- 1.25M credits per month
- Professional voice cloning
- $49 of prepaid agent usage
Scale
$299/mo
- 8M credits per month
- Priority support
- High concurrency limits
Enterprise
Contact sales
- Custom credits and volume pricing
- SSO and DPAs
- Shared Slack channel
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Cartesia Sonic
- Very fast time to first audio
- Wide language coverage in one model
- Cloning from ten seconds of audio
- Aimed at developers more than casual users
- Credit system takes a while to understand
- Commercial license needs a paid plan
AudioStack
- Produces large numbers of ad variants
- Access to many voice providers
- Self-serve or embedded use
- No public pricing
- Aimed at media and ad businesses
- Demo needed for enterprise setups
Which one should you choose?
Choose Cartesia Sonic if you want:
- Very fast time to first audio
- Wide language coverage in one model
- Cloning from ten seconds of audio
Watch out: aimed at developers more than casual users.
Choose AudioStack if you want:
- Produces large numbers of ad variants
- Access to many voice providers
- Self-serve or embedded use
Watch out: no public pricing.
Cartesia Sonic vs AudioStack FAQ
What is the difference between Cartesia Sonic and AudioStack?
Cartesia Sonic: Low-latency text-to-speech API for voice agents. AudioStack: Agentic audio production platform for ads, publishers and media. Both are audio & voice tools.
Is Cartesia Sonic or AudioStack cheaper?
Cartesia Sonic starts at $5/mo and AudioStack starts at See pricing page. Check both pricing pages for current plans.
Do Cartesia Sonic and AudioStack have free plans?
Cartesia Sonic: Yes. AudioStack: No.
Who makes Cartesia Sonic?
Cartesia Sonic is made by Cartesia, based in United States.
Who makes AudioStack?
AudioStack is made by AudioStack, based in United Kingdom.
Which should I choose, Cartesia Sonic or AudioStack?
Choose Cartesia Sonic if you value very fast time to first audio and wide language coverage in one model. Choose AudioStack if you value produces large numbers of ad variants and access to many voice providers.