rumik silk and cartesia both generate speech for apps and live conversations.

cartesia builds speech models and voice agents. its sonic models turn text into speech using selected or cloned voices, with streaming support for live applications.

rumik silk is a family of text-to-speech models available through the silk api. teams use silk to turn scripts into voice overs for youtube videos and e-learning courses. the same models also power rumik's voice agents, generating spoken replies as a conversation unfolds.

how is rumik silk different from cartesia?

1. describe the voice

cartesia generates speech using a voice you select from its library or create through cloning. you can adjust the delivery, but its tts request does not accept a natural-language description of the speaker.

silk's mulberry takes a voice description alongside the text you want spoken. you can specify the speaker's age, accent, pace, and emotion in the same request:

description: warm indian english voice, early 30s, calm pace, conversational
text: your delivery is scheduled for friday. you can check the latest update in the app

description: warm indian english voice, early 30s, calm pace, conversational
text: your delivery is scheduled for friday. you can check the latest update in the app

this lets you direct the voice through a written description without first finding a matching voice.

2. choose unlimited tts usage

cartesia's public tts plans include a monthly credit allowance. once those credits run out, further generation is billed as overage usage. if overages are disabled, new requests stop until you upgrade your plan or the allowance renews.

silk's unlimited usage plans charge a fixed monthly price for a set number of simultaneous generations. you can generate as much speech as you need within that limit without paying extra per character. the plan limits how many generations can run at once, rather than how much text you can turn into speech each month.

how rumik silk and cartesia compare

rumik silk and cartesia both support code-switching, text normalization, real-time streaming, and inline vocal events. silk also offers voice descriptions inside the tts request and unlimited usage plans while cartesia offers voice cloning on paid plans.

how much do rumik silk and cartesia cost?

cartesia pricing

you can start testing cartesia with 20,000 free credits each month, then move to a paid plan as you need more speech. paid plans start at $5/month for 100,000 credits. tts uses roughly one credit per character, so the allowance gives you a useful estimate of how much text you can generate.

the monthly fee covers your included credits. if you use more, enabling overages keeps generation running and adds the extra usage to your bill. leave overages off and requests stop when the credits run out. for volumes beyond the standard plans, cartesia offers custom enterprise pricing.

rumik silk pricing

with silk, you can pay for the text you submit or choose a fixed monthly bill. pay as you go costs $0.005 per 1,000 characters for mulberry and $0.010 for muga.

if you're generating speech regularly and want a predictable bill, unlimited tts plans start at $199/month. the plan you choose depends on how many generations your product needs to run at once:

for example, the $399 plan lets you run two generations at once. generating more text during the month doesn't add to that bill, as long as you stay within that limit. if your product needs more than eight simultaneous generations, contact rumik for a larger plan.

when should you choose rumik silk or cartesia?

choose rumik silk if

• you want to describe the speaker inside each tts request.

• you generate a lot of speech and want unlimited tts at a fixed monthly price.

choose cartesia if

• you need to clone a specific speaker's voice.

• your product needs speech in a language silk doesn't support.

you can try silk in the rumik playground. paste a few lines from your own script and hear how it sounds.