Start free. Upgrade when you need more AI help.

Use pinyin, HSK lookup, and conversion tools for free. Upgrade to Plus for more grammar checks, email rewrites, and Ask messages.

Start Free COMPARE PLANS

NiuTools / PricingFree + Plus

Core tools are free. AI features use monthly credits.

Core tools are free

AI features use credits

Plus includes 300 credits / month

Choose your plan.

Free

Unlimited core tools, plus 30 AI actions monthly.

Free forever

$0per month

No credit card required

30 credits / month

Start Free

Included

Unlimited Chinese Pinyin

Unlimited Simplified / Traditional Converter

Unlimited HSK Vocabulary Lookup

30 monthly credits for Ask and writing trials

Synced history and favorites

Rule-based tools do not use credits. AI actions show their credit cost before you run them.

Plus

For regular Ask and AI writing workflows.

Popular

$10per month

Pay monthly

300 credits / month

Everything in Free, plus

300 monthly credits for Ask and writing

Ask chat with tool context

AI grammar review and email rewriting

Cloud history and favorites

Priority processing

Credits reset monthly. Stripe and PayPal checkout open from the subscription page when Plus billing is configured.

Credits

How credits work

Pinyin, conversion, and HSK lookup do not use credits. Grammar checks, email rewrites, and Ask messages use credits.

Grammar check

Review learner writing and suggested corrections

Email rewrite

Rewrite Chinese drafts in selected tone

Ask context

Chat with the current tool result when AI is configured

AI use rules

Ask and Quick Fix are lightweight actions. Deep Review and longer email drafts use more credits because they run heavier model work.

Free: 30 credits / month

Ask message1 use

Ask with tool context1 use

Grammar Quick Fix1 use

Grammar Deep Review2 uses

Email Rewrite1 use per 500 characters

Email Regenerate1 use per 500 characters

Need more credits? Higher-tier plans for heavier AI workflows are coming later.

Start free. Upgrade only when you need more.

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