kitio.aiCartesia Sonic vs SpeechGen.io
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Cartesia Sonic starts at $5/mo and SpeechGen.io 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
- 5,000+ voices in 150 languages
- SSML editing controls
- Voice cloning
- Subtitles to audio
- Transcription
- API
| Feature | Cartesia Sonic | SpeechGen.io |
|---|---|---|
| Best for | Low-latency text-to-speech API for voice agents | Text-to-speech with 5,000+ voices, SSML control and pay-as-you-go credits |
| Category | Audio & voice | Audio & voice |
| Pricing model | Freemium | Freemium |
| Starting price | $5/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Cartesia | SpeechGen.io |
| 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 SpeechGen.io 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
4 plans
10,000 credits
₹199 one-time
- About 24 minutes of speech
- TTS or transcription
40,000 credits
₹699 one-time
- About 95 minutes of speech
200,000 credits
₹2,499 one-time
- About 476 minutes of speech
2,000,000 credits
₹14,999 one-time
- About 4,762 minutes of speech
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
SpeechGen.io
- No subscription required
- Credits last up to a year
- Free repeats via cache
- Very wide voice selection
- Evidence shows prices in rupees only
- Free trial covers only 1,000 characters
- Editor can feel technical
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 SpeechGen.io if you want:
- No subscription required
- Credits last up to a year
- Free repeats via cache
Watch out: evidence shows prices in rupees only.
Cartesia Sonic vs SpeechGen.io FAQ
What is the difference between Cartesia Sonic and SpeechGen.io?
Cartesia Sonic: Low-latency text-to-speech API for voice agents. SpeechGen.io: Text-to-speech with 5,000+ voices, SSML control and pay-as-you-go credits. Both are audio & voice tools.
Is Cartesia Sonic or SpeechGen.io cheaper?
Cartesia Sonic starts at $5/mo and SpeechGen.io starts at See pricing page. Check both pricing pages for current plans.
Do Cartesia Sonic and SpeechGen.io have free plans?
Cartesia Sonic: Yes. SpeechGen.io: Yes.
Who makes Cartesia Sonic?
Cartesia Sonic is made by Cartesia, based in United States.
Who makes SpeechGen.io?
SpeechGen.io is made by SpeechGen.io.
Which should I choose, Cartesia Sonic or SpeechGen.io?
Choose Cartesia Sonic if you value very fast time to first audio and wide language coverage in one model. Choose SpeechGen.io if you value no subscription required and credits last up to a year.