Pricing

Get the book

Pay once and keep it, with every update. Start with Basic and upgrade to Plus any time for the difference.

Launching soon

You can't buy it just yet. Get 7 free lessons by email in the meantime, and you'll hear the moment it launches.

Basic

$49 ~~Regular price $74~~

Early-access price. It goes up when the video course comes out.

The whole book on the web
The PDF, in colour and printer-friendly
Lifetime updates

Available at launch

Plus

$99 ~~Regular price $149~~

Early-access price. It goes up when the video course comes out.

Everything in Basic
The AI skills for your coding agent
The templates
The video course, when it comes out

Available at launch

The AI skills in Plus

Skills for coding agents like Claude Code, Cursor and Codex, which put the book's checklists to work on your own codebase. You install them with one command.

/internationalise-audit

Audits a codebase for everything the book covers, and reports each problem with its file, line and the chapter to read.
/internationalise

Makes an app translatable and locale-aware, one phase of the playbook at a time.
/localise

Gets an internationalised app ready for one region: formats, currency, tax, addresses, layout and hreflang.
/extract-translation-strings

Moves hardcoded text into your translation files as whole sentences with proper plurals.
/pseudolocalise

Runs your app in a fake, longer, right-to-left language and reports what broke.
/rtl-check

Reads your code and reports what will break in Arabic, Hebrew, Persian and Urdu.
/timezone-review

Follows dates and times from input to storage, display, jobs and emails, and reports where they change meaning.
/form-review

Reviews one form end to end and proposes what it should ask in each country you serve.
/check-translations

Checks translation files against the source language: missing and extra keys, placeholders dropped or renamed, broken ICU syntax, the wrong plural forms for the language, strings left in English, text likely to clip, and punctuation that doesn't suit the locale.
/translator-brief

Drafts a translator brief, glossary and style guide for one locale from your codebase and product, using the book's templates.
/l10n-vocabulary

The book's glossary as a reference your agent can use, so you can both name things precisely.

For teams

Buy a seat for everyone doing the work, then hand the seats out by email. The seats belong to your company, so when someone leaves you can give theirs to someone else. Teams get 25% off at 3 seats or more and 50% off at 10 seats or more. Every purchase comes with an invoice, and you can add your company's tax ID at checkout.

Team seats are available at launch.

Give it as a gift

Buy a copy for someone else. We'll email them a link to claim it, and if they never do, you can send it to someone else from your account.

Gifts are available at launch.

Want your company to pay? Here's an email you can send your manager. Need to pay by bank transfer, or buying for more than 500 people? Get in touch and we'll send an invoice.

Questions about buying

Can I read some first?: Yes. The preface and two chapters are free, and every other chapter shows its opening.
What if it isn't for me?: Email hello@helloworld.guide within 30 days for a full refund. No questions.
Is there a student discount?: Yes, 50% off for anyone studying full time. Email hello@helloworld.guide from your student email address, or with proof you're enrolled, and we'll send you a code.
Do I get an invoice?: Yes, with every purchase, and you can add your company's tax ID at checkout.
Can I give it to someone else?: Yes. Buy it as a gift, or buy team seats and hand them out.

Questions about the book itself, like who it's for and what it covers, are answered on the home page. For anything else, email hello@helloworld.guide and Liam will get back to you.