API pricing

More human. More you. Facts intact.

Rewrite and Detect over REST, for CMSs, content pipelines and your own product. Every number, name and link is checked against the source. API plans from $74.17/mo billed yearly, or $89 billed monthly.

Prices in USD. Annual is 10 months' price for 12.

Basic API

Automate one publishing workflow.

Best for small sites, side projects and a single CMS integration

$89/ mo

Billed $890 yearly · save $178

Choose Basic API

200k words / month

  • Articles≈ 230 / mo
  • Rate limit60 req/min
  • Voices3

Includes

  • REST API: Rewrite + Detect
  • Light and standard strength
  • Fact check and 422 fail-closed
  • Usage dashboard and alerts
  • Email support

After 200k words: $0.55 per 1,000, only if you switch pay as you go on, with a monthly cap you choose.

Past ~152k extra words a month, Pro API is cheaper than overage.

Pro API

Recommended

For content teams shipping every day.

Best for SEO teams, content sites and agencies running several pipelines

$189/ mo

Billed $1,890 yearly · save $378

Choose Pro API

600k words / month

  • Articles≈ 700 / mo
  • Rate limit180 req/min
  • Voices15

Everything in Basic API, plus

  • Deep mode for heavy AI drafts
  • Detect calibrated to a writer
  • 15 voice profiles
  • Priority email support

After 600k words: $0.55 per 1,000, only if you switch pay as you go on, with a monthly cap you choose.

Past ~304k extra words a month, Ultra API is cheaper than overage.

Ultra API

Best value

For high-volume and product integrations.

Best for platforms, publishers and tools embedding rewrite and detection

$389/ mo

Billed $3,890 yearly · save $778

Choose Ultra API

1M words / month

  • Articles≈ 1,150 / mo
  • Rate limit600 req/min
  • VoicesUnlimited

Everything in Pro API, plus

  • Highest queue priority
  • Unlimited voice profiles
  • Priority support

After 1M words: $0.55 per 1,000, only if you switch pay as you go on, with a monthly cap you choose.

Busy month? Upgrade, or pay as you go. $0.55 per started 1,000 words past your allowance, only if you switch it on, up to a monthly cap you choose. Billed monthly in arrears, on monthly and annual plans.

Off, or at the cap: requests stop with 402 and nothing is processed.

  • Past ~152k extra words a month, Pro API is cheaper than Basic API + pay as you go.
  • Past ~304k extra words a month, Ultra API is cheaper than Pro API + pay as you go.

Need more than 1M words a month? Email support@intactvoice.com

Which plan?

Which plan is right for you?

Start from what you're building. Pick the closest match and we'll take you to the plan.

How words are counted

Writing costs more than reading.

Rewriting toward a voice and checking every fact is the heavy lift, so it's a word for a word. Scanning with Detect costs a fifth of that.

1,000 words in

words used

Rewrite

1 word per word

1,000

Detect

1 word per 5 scanned

200

Check a draft, rewrite it, check it again: a 1,000-word article uses 1,400 words. Voice profiles aren't billed, and a rewrite that fails its fact check (422) isn't either.

Upgrade, or pay as you go

Monthly words
Pay as you go
402
first then, if you switch it on at your cap

  • Monthly words first

    Your allowance resets every month, on monthly and annual plans.

  • Then pay as you go · $0.55 per 1,000

    Only if you switch it on. You choose a monthly cap ($50 to $1,000); extra words are counted per started 1,000 on each request and billed monthly in arrears.

  • Or upgrade

    Change plans in the Stripe customer portal. Past ~152k extra words a month, Pro API costs less than Basic API plus pay as you go.

  • Then a clear 402

    Your allowance is used and pay as you go is off, or its monthly cap is reached. Nothing was processed.

Estimate

Put your numbers in.

Drag to a real month. We'll find the cheapest way to cover it, a plan on its own or a plan plus pay as you go, and show the math.

Your month on the API

Drafts moved toward a voice, facts checked

400k/ mo

25k400k2M

Counted at 1 word per 5 scanned

500k/ mo

01M5M
Rewrite400k
Detect (500k ÷ 5)100k

Words you'll use

500,000 / mo

Cheapest way to cover it

Pro API

/ mo

billed yearly

500k of 600k words83% used

The math for 500k words a month, billed yearly

  • CheaperPro API$157.50
  • Basic API + 300k pay as you go$74.17 + $165.00 = $239.17

Upgrading to Pro API is cheaper than Basic API plus pay as you go.

Estimate only. Pay-as-you-go words assume the same usage every month.

Choose Pro API

Compare

Every plan, side by side.

Billed yearly

Pro API

$157.50 / mo

Words and price
Rewrite words per month1 rewritten word = 1 word
600k
Or words scanned by Detect1 word per 5 scanned
3M
Price, billed monthly
$189 / mo
Price, billed annually10 months' price for 12
$1,890 / yr
Pay as you go overageOpt-in, off by default, with a monthly cap you choose
$0.55 / 1k
Rewrite and Detect
Rewrite strength
+ Deep
Fact check, 422 fail-closedA rewrite that fails its fact check isn't billed
Voice profiles
15
Detect calibrated to a writer
Platform
Rate limit
180 req/min
Webhooks and async jobs
Test keysSimulated results for integration testing, not billed
Highest queue priority
Support
Priority email
Choose Pro

FAQ

Questions, answered.

Something we haven't covered? Write to support@intactvoice.com.

  • Rewrite counts the words in the text you send: rewriting 1,000 words uses 1,000 words of your allowance. Detect uses 1 word for every 5 it scans, so checking the same 1,000 words uses 200. Voice profiles aren't billed, and a rewrite that fails its fact check (HTTP 422) isn't billed either.

Ready when you are

Publish more. Sound like you.

Pro API covers 600k words a month for $157.50/mo billed yearly, with deep mode and a fact check on every rewrite.

Choose Pro APIRead the API docs