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Translation · head to head

Pontoon vs Sonix

Pontoon logo

Pontoon

Translation

Mozilla open source localisation platform that you host yourself

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 Pontoon has a free tier, so it costs nothing to try first.
  • Each has a real cost: Pontoon there is no hosted commercial edition, so adopting it means running Django, PostgreSQL and a task queue yourself and keeping them patched.; 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: Pontoon covers Repository sync, Sonix covers Automated transcription.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Pontoon and Sonix actually diverge.

Attributes where Pontoon and Sonix differ
AttributePontoonSonix
Starting priceFree$10/month
Pricing modelOpen source, no licence feePer hour of transcription
Free tierYesNo
PlatformsWeb, Self-hostedWeb, API

Identical on both: user rating (Not yet rated), category (Translation).

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 Pontoon

  • Repository sync
  • Suggest and approve workflow
  • Fluent support
  • Translation memory
  • Machine translation suggestions
  • Contributor statistics

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.

Pontoon

  • Open source projects with volunteer translator communities across many localesnot Sonix
  • Organisations that must keep translation data on their own infrastructurenot Sonix
  • Projects using Mozilla Fluent where commercial tools have partial or no supportnot Sonix
  • Replacing a per seat translation platform where contributor count, not word volume, drives the billnot Sonix

Sonix

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

Where each one falls short

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

Pontoon

  • There is no hosted commercial edition, so adopting it means running Django, PostgreSQL and a task queue yourself and keeping them patched.
  • No vendor support and no service level agreement exist, so an outage during a release freeze is your engineering problem alone.
  • The roadmap serves Mozilla localisation needs first, and features outside that scope are unlikely to be built for you.
  • Format coverage is narrow next to commercial systems: it is strong on PO and Fluent, weak on document formats such as InDesign or complex XML.
  • Because you host it, security and compliance evidence such as an external audit report does not exist, so any assurance your customers need has to be produced by your own team.

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

Pontoon

Free
  • Open source, self-hostedFree
    • No licence fee and no per contributor charge
    • You provide hosting, database and maintenance
    • Machine translation billed by whichever engine you connect

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 Pontoon if

  • You need repository sync.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want suggest and approve workflow.
Pontoon review

Choose Sonix if

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

Questions people ask

Is Pontoon or Sonix better?
Neither clearly leads. Pontoon 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, Pontoon or Sonix?
Pontoon has a free tier; the other does not. Paid plans start at Free for Pontoon and $10/month for Sonix.
Does Pontoon or Sonix run on more platforms?
Pontoon runs on Web, Self-hosted. Sonix runs on Web, API.
Can I use Pontoon for free?
Yes. Pontoon has a free tier, so you can try it without paying. Sonix starts at $10/month.
What is Pontoon best used for?
Pontoon is most often used for open source projects with volunteer translator communities across many locales, organisations that must keep translation data on their own infrastructure, projects using mozilla fluent where commercial tools have partial or no support, replacing a per seat translation platform where contributor count, not word volume, drives the bill. Of those, open source projects with volunteer translator communities across many locales and organisations that must keep translation data on their own infrastructure are not what Sonix is typically brought in for.
What can Pontoon do that Sonix cannot?
Pontoon covers Repository sync, Suggest and approve workflow, Fluent support, Translation memory. Sonix covers Automated transcription, Translation, Synchronised editor, Subtitle export.

Answered from the vendors’ own pages

Pontoon: Is there a paid hosted version?

No. Mozilla runs an instance for its own projects. Anyone else deploys their own.

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.

Pontoon: What does it actually cost?

Server hosting, engineering time to operate it, and whatever machine translation engine you connect. There is no licence fee.

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.

Pontoon: Is it suitable for a commercial product?

Only if you have infrastructure staff and mostly software string formats. Document translation and vendor support are missing.

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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