Castor Pricing in 2026

FreemiumStarts at $15.00/mo

Visit Castor

Free

$0forever
  • 1 user

Pro

$15/mo
  • Unlimited users
  • Priority support
  • Advanced features

Business

custom/mo
  • Custom pricing for large teams
  • Dedicated support
  • Enterprise-grade security

Pricing information was last verified on March 11, 2026. Pricing may have changed. Visit Castor for current pricing.

Pricing Overview

Castor's pricing model is a freemium structure, offering a free tier and two paid plans: Pro and Business. The starting price for Castor is $15 per month.

Plan Comparison

PlanNumber of UsersFeatures
Free1 userBasic documentation features, limited storage (10 GB)
ProUnlimited usersAll basic features, advanced collaboration tools, 100 GB storage, priority support
BusinessCustom pricing for large teams and enterprisesAll Pro features, custom onboarding, dedicated support, custom storage solutions

The free tier is suitable for small projects or individual use cases. The Pro plan offers unlimited users and more extensive features, making it a good choice for medium-sized teams.

Hidden Costs and Considerations

While the pricing page provides a clear breakdown of costs, there are some potential hidden expenses to consider:

  • Storage: While the free tier has limited storage (10 GB), the Pro plan's 100 GB may not be sufficient for large datasets. Additional storage can be purchased at $1 per GB/month.
  • Custom onboarding: For Business customers, custom onboarding is included in the price. However, this may require additional resources and expertise from Castor's team.
  • Support: Priority support is included with the Pro plan, but dedicated support for Business customers may incur additional costs.

Cost Estimates by Team Size

To help estimate costs, here are rough monthly estimates based on team size:

  • Solo user or small team (1-5 users): $15/month (Pro plan) or free (if basic features suffice)
  • Medium-sized team (6-20 users): $15/user/month (Pro plan), totaling varies by usage/month
  • Large team or enterprise: Custom pricing for the Business plan, estimated to be 2-5 times the cost of the Pro plan (varies by usage/user/month)

Keep in mind that these estimates are rough and may vary depending on specific use cases and feature requirements.

How Castor Pricing Compares

Castor's pricing is competitive with other documentation tools. For comparison, here are brief overviews of two competitors:

  • Notion: Offers a free plan with unlimited pages and users, but limited storage (100 MB). Paid plans start with varying pricing.
  • Confluence: Has a free trial, but no free plan. Pricing starts with varying pricing for the Standard plan.

Castor's Pro plan offers more features than Notion's free plan and is priced similarly to Confluence's Standard plan. However, Castor's Business plan is more expensive than both competitors' top-tier plans.

Castor Pricing FAQ

What is available in the free tier of Castor?

The free tier includes access to basic features for a single user. This allows you to try out our service before upgrading to a paid plan.

How much does it cost to use Castor with my team?

Our Pro plan costs $15 per month, which supports up to 10 users. For larger teams or custom pricing, please contact us for a quote on our Business plan.

Are there any discounts available for long-term commitments?

We offer discounts for annual payments and volume licensing. Please contact our sales team to discuss your specific needs and get a customized quote.

Are there any hidden costs or fees associated with using Castor?

No, our pricing is transparent and straightforward. There are no additional fees or charges beyond the monthly subscription cost.

What if I'm not satisfied with Castor? Can I get a refund?

We offer a 30-day money-back guarantee. If you're not satisfied with our service within this timeframe, please contact us for a full refund.

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