Softwr

AI · head to head

Deepgram vs Sonix

Deepgram logo

Deepgram

AI

Voice AI API platform for speech-to-text, text-to-speech, and voice agents

From
Free
Rated
-
Full reviewWebsite
Sonix logo

Sonix

Translation

Automated transcription and translation with per-hour pricing published up front

From
$10/month
Rated
-
Full reviewWebsite

The short version

  • Only Deepgram has a free tier, so it costs nothing to try first.
  • Each has a real cost: Deepgram pricing is entirely usage-based, so total cost can be harder to predict than flat subscription tools.; Sonix monthly hour allowances are small relative to the subscription price: the $25 Core plan includes five hours, which at the published $10 overage rate means the subscription is only worth buying for storage and features rather than for the hours.
  • They diverge on capability: Deepgram covers Flux speech-to-text, Sonix covers Automated transcription.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Deepgram and Sonix actually diverge.

Attributes where Deepgram and Sonix differ
AttributeDeepgramSonix
Starting priceFree$10/month
Pricing modelusage-basedPer hour of transcription
Free tierYesNo
CategoryAITranslation

Identical on both: platforms (web, api), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Deepgram

  • Flux speech-to-text
  • Flux text-to-speech
  • Voice Agent API
  • Real-time and batch processing
  • Self-hosted deployment
  • Audio intelligence

Only in Sonix

  • Automated transcription
  • Translation
  • Synchronised editor
  • Subtitle export
  • Custom dictionary
  • Search across media
  • Pay-as-you-go option
  • Enterprise compliance

What people use each for

The jobs each tool is most often brought in to do.

Deepgram

  • Building real-time voice agents for customer supportnot Sonix
  • Transcribing recorded audio at scale via batch STTnot Sonix
  • Adding conversational text-to-speech to voice applicationsnot Sonix
  • Self-hosting speech models for data residency requirementsnot Sonix

Sonix

  • A journalist transcribing interviews in several languages who needs the transcript searchable and quotable within minutes rather than accurate to a contractnot Deepgram
  • A qualitative research team coding focus group transcripts, where speaker separation and an editable transcript matter more than a certified accuracy figurenot Deepgram
  • A podcast producer generating subtitle files and show notes from each episode without adding a human transcription suppliernot Deepgram
  • A small documentary team subtitling foreign-language footage where transcription and translation in one tool avoids a second vendornot Deepgram

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Deepgram

  • Pricing is entirely usage-based, so total cost can be harder to predict than flat subscription tools.
  • The Growth plan requires a minimum $4K/year commitment to unlock discounted rates.
  • Enterprise features and custom SLAs require a direct sales conversation rather than self-serve signup.
  • Some promotional per-minute rates are time-limited, meaning long-term pricing may differ from current promotional rates.

Sonix

  • Monthly hour allowances are small relative to the subscription price: the $25 Core plan includes five hours, which at the published $10 overage rate means the subscription is only worth buying for storage and features rather than for the hours.
  • Unused hours do not accumulate into a meaningful reserve, so an irregular workload of a heavy month followed by a quiet one pays overage in the first and wastes allowance in the second.
  • There is no human correction tier at self-service prices, so anyone with an accessibility or legal accuracy obligation has to add a separate supplier or a member of staff to the workflow.
  • The cited 99 percent accuracy is a best-case figure on clean single-speaker audio, and overlapping speakers, strong accents, technical vocabulary and room noise degrade it enough that editing time, not transcription cost, becomes the real expense.
  • Storage is capped per plan at 25GB to 100GB, and video files consume it fast, so long-running teams end up deleting source media or upgrading a tier for storage they do not otherwise need.

Pricing, plan by plan

Deepgram

Free
  • Pay As You Go$undefined/mo
    • $200 free credit to start
    • No minimums or expiration
    • No credit card required to start
  • Growth$undefined/mo
    • Save up to 20% with annual pre-paid credits
    • Minimum $4K/year commitment
    • Credits applied against actual usage
  • Enterprise$undefined/mo
    • Custom pricing for large-scale deployments
    • Dedicated support and contracts

Sonix

$10/month
  • Pay As You Go$10/month
    • $10 per hour transcribed
    • No subscription
    • 30 minutes free to trial without a card
  • Core$25/month
    • 5 hours a month of transcription and translation
    • 25GB storage
    • $275 a year if billed annually
  • Advanced$50/month
    • 20 hours a month
    • 50GB storage
    • $550 a year if billed annually
  • Pro$80/month
    • 40 hours a month
    • 100GB storage
    • $880 a year if billed annually

Which should you pick?

Choose Deepgram if

  • You need flux speech-to-text.
  • You want to start without paying.
  • You work on web, api.
  • You also want flux text-to-speech.
Deepgram review

Choose Sonix if

  • You need automated transcription.
  • You work on Web, API.
  • You also want translation.
Sonix review

Questions people ask

Is Deepgram or Sonix better?
Neither clearly leads. Deepgram starts at Free and Sonix at $10/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Deepgram or Sonix?
Deepgram has a free tier; the other does not. Paid plans start at Free for Deepgram and $10/month for Sonix.
Does Deepgram or Sonix run on more platforms?
Deepgram runs on web, api. Sonix runs on Web, API.
Can I use Deepgram for free?
Yes. Deepgram has a free tier, so you can try it without paying. Sonix starts at $10/month.
What is Deepgram best used for?
Deepgram is most often used for building real-time voice agents for customer support, transcribing recorded audio at scale via batch stt, adding conversational text-to-speech to voice applications, self-hosting speech models for data residency requirements. Of those, building real-time voice agents for customer support and transcribing recorded audio at scale via batch stt are not what Sonix is typically brought in for.
What can Deepgram do that Sonix cannot?
Deepgram covers Flux speech-to-text, Flux text-to-speech, Voice Agent API, Real-time and batch processing. Sonix covers Automated transcription, Translation, Synchronised editor, Subtitle export.

Answered from the vendors’ own pages

Deepgram: What does Deepgram cost?

Deepgram uses usage-based pricing starting with $200 in free credit, pay-as-you-go rates per minute or per character, a Growth plan with annual pre-paid credits requiring a $4K/year minimum, and custom Enterprise pricing.

Source
Sonix: What does Sonix cost per hour?

$10 an hour on pay-as-you-go, and $10 an hour for any usage beyond the monthly allowance on every subscription tier. That overage rate is published, which is unusual in this market.

Deepgram: Is there a free plan, and what are its limits?

New users get $200 of free credit with no credit card required, which can be applied to speech-to-text, text-to-speech, or voice agent usage before any payment is needed.

Source
Sonix: Is there human transcription?

No. Sonix is automated transcription plus an editor for you to correct. If you need a contracted accuracy level, this is the wrong category of product.

Deepgram: How is usage metered?

Usage is metered per minute of audio for speech-to-text and voice agent calls, and per 1,000 characters for text-to-speech, with add-ons like redaction and entity detection billed separately per minute.

Source
Sonix: How accurate is it really?

The 99 percent claim assumes clean, single-speaker, standard-accent audio. Multi-speaker recordings with background noise land noticeably lower, and the cost shows up as your editing time.

Sonix: How many languages?

Transcription in over fifty languages and translation into a similar number, which is wider than most self-service competitors.

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