# Pricing

> Lettern is free and open source under the MIT licence, on every site. Premium plugins such as Commerce are there when a project needs them.

## Free and open source.

Premium plugins when you need them.

Lettern

Free

MIT licence, every site

The assistant and MCP included

No keys, seats or banners

[Get started](https://lettern.org/download)

See it on GitHub

Commerce

€199

per site

Checkout, invoices, VAT and refunds

Test mode on any host, for free

€119 to extend updates

[See Commerce](https://lettern.org/store/commerce)

All plugins

## Questions

**Can I use it for client work?**

Yes. Any use, on any number of sites. There’s no key to enter and no banner to remove.

**Does the assistant cost extra?**

No. It runs on your own API key, so you pay your AI provider directly for what you use.

**What does a plugin licence cover?**

One site, with updates for the period shown when you buy. An extension adds another period.

**What if a plugin licence runs out?**

Your site keeps running and keeps selling. The most it does is show a banner in the admin.

**Do prices include VAT?**

Prices exclude VAT. You see the total for your country before you pay.

**Can I get a refund?**

Yes, within 30 days of buying a plugin licence.

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Source: https://lettern.org/pricing · Updated 2026-10-30