kitio.aiCartesia Sonic vs ttsMP3
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Cartesia Sonic starts at $5/mo and ttsMP3 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
- Browser-based text to speech
- MP3 download
- 60 voices in 28 languages
- No sign-up
- Commercial use allowed
| Feature | Cartesia Sonic | ttsMP3 |
|---|---|---|
| Best for | Low-latency text-to-speech API for voice agents | Free online text to speech with MP3 download and 60 Polly voices |
| Category | Audio & voice | Audio & voice |
| Pricing model | Freemium | Freemium |
| Starting price | $5/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Cartesia | ttsMP3 |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Cartesia Sonic starts at $5/mo and ttsMP3 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
ttsMP3
- No account required
- Commercial use permitted
- Wide language coverage
- 3,000-character daily limit
- Voices are standard Polly, not cloned
- Very basic editing controls
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 ttsMP3 if you want:
- No account required
- Commercial use permitted
- Wide language coverage
Watch out: 3,000-character daily limit.
Cartesia Sonic vs ttsMP3 FAQ
What is the difference between Cartesia Sonic and ttsMP3?
Cartesia Sonic: Low-latency text-to-speech API for voice agents. ttsMP3: Free online text to speech with MP3 download and 60 Polly voices. Both are audio & voice tools.
Is Cartesia Sonic or ttsMP3 cheaper?
Cartesia Sonic starts at $5/mo and ttsMP3 starts at See pricing page. Check both pricing pages for current plans.
Do Cartesia Sonic and ttsMP3 have free plans?
Cartesia Sonic: Yes. ttsMP3: Yes.
Who makes Cartesia Sonic?
Cartesia Sonic is made by Cartesia, based in United States.
Who makes ttsMP3?
ttsMP3 is made by ttsMP3.
Which should I choose, Cartesia Sonic or ttsMP3?
Choose Cartesia Sonic if you value very fast time to first audio and wide language coverage in one model. Choose ttsMP3 if you value no account required and commercial use permitted.