Kafkai vs WordAi (2026): which should you pick?

Pick Kafkai if

• Fits if you already work in Claude, ChatGPT or Cursor and want search data inside it
• Works for one-off research projects, since you pay as you go

Look elsewhere if

• Skip it if you want an article writer, because there is no writing tool of its own
• Not for you if you don't use an AI assistant over MCP
• Tight if you want rank tracking, since research runs only when asked
• Watch out: prices are in yen with Japanese consumption tax, and credits expire after 90 days

Pick WordAi if

• Fits if you rewrite lots of articles at once
• Works for people who want an API for bulk rewrites

Look elsewhere if

• Tight if you want to test: 3 days and no free plan
• Skip it if you want the detection pass on everything, since it caps at 25,000 words on Starter
• Watch out: the 30-day money-back guarantee only applies if fewer than 10 articles were rewritten
• Not for you if you want an app or extension, because none is listed

Kafkai

• Prices are in Japanese yen and include Japanese consumption tax; the checkout works out tax from the billing address.
• Credits expire 90 days after they are granted or bought.
• It does not track rankings on a schedule; research runs only when asked.
• It is used through an AI assistant over MCP, with a roughly 30-minute one-time setup, and has no writing tool of its own.

WordAi

• The AI-detection pass has its own smaller monthly cap: 25,000 words on Starter and 250,000 on Power.
• The page says nothing about a free plan; the trial lasts 3 days.
• The 30-day money-back guarantee applies only if fewer than 10 articles were rewritten.
• No apps or extensions are listed; it is used in the browser.

Kafkai

Keywords and content gaps

Lists the keywords a site ranks for with position and monthly search volume, and the keywords competitors rank for that it does not.

Competitor finding

Returns the sites that rank for the same searches and how far their keywords overlap with yours.

Backlinks

Shows who links to a site, new and lost links by date, and the sites that link to competitors but not to you.

Search Console for your own site

After you prove the domain with a DNS record, pages and searches losing clicks can be read through the same AI.

Amazon and Google Shopping checks

Shows where a product appears in Amazon and Google Shopping results for a keyword, in the supported countries, at 5 credits per keyword.

WordPress drafts

Your AI writes the article and Kafkai sends it to a WordPress site as a draft; Kafkai itself does not write or store articles.

WordAi

Sentence-level rewriting

Restructures each sentence while keeping its meaning, with a slider between conservative and more adventurous rewrites.

Many variations

Creates from 1 to 1,000 rewrites of a single article.

Bulk rewrite and export

Upload many articles at once and download rewrites in bulk or as spintax.

AI-detection pass

A rewrite mode aimed at passing AI detectors, with its own monthly word cap on each plan.

API and HTML support

Rewrites HTML content, shows code view, and exposes an API for adding rewriting to a workflow.

Article Forge import

Imports articles generated by Article Forge so they can be rewritten.

Kafkai

• 1,000 credits¥1,000

  one-time top-up, used as you go (¥1,100 with consumption tax)

  1,000 credits, enough for one project with one competitor, per the features page.

• 3,000 credits¥3,000

  one-time top-up, used as you go (¥3,300 with consumption tax)

  3,000 credits with no bonus.

• 5,000 credits¥5,000

  one-time top-up, used as you go (¥5,500 with consumption tax)

  5,000 credits with no bonus.

• 10,500 credits¥10,000

  one-time top-up, used as you go (¥11,000 with consumption tax)

  10,000 credits plus a 5% bonus.

• 22,000 credits¥20,000

  one-time top-up, used as you go (¥22,000 with consumption tax)

  20,000 credits plus a 10% bonus.

WordAi

• Starter$9

  per month, billed annually ($17 billed monthly)

  50,000 rewrite words a month, of which 25,000 can be run through the AI-detection pass. Bulk rewriting and API access included.

• Power$27

  per month, billed annually ($57 billed monthly)

  3,000,000 rewrite words a month, of which 250,000 can be run through the AI-detection pass.

• EnterpriseCustom

  Custom word volumes with white-labeled integration, multiple user accounts and an account manager, arranged by contacting the vendor.

Kafkai

No public discounts listed.

WordAi

• Annual discount

  Save 47% with yearly billing

  The pricing page offers yearly billing at 47% below monthly, shown as $9 against $17 a month on Starter.