AI translation / Rails I18n

Ruby on Rails translation & YAML I18n localization.

Translate Rails YAML I18n files with AI and 100% protection for interpolation variables, nested keys, indentation and pluralization keys. Human-level language accuracy. None of the YAML repair work.

Translate YAML free See what stays protected

Free trial  ·  100+ languages  ·  Your existing YAML workflow

Illustrated Rails YAML workflow. A repository exports config/locales/en.yml to Qopywriter.ai. The engine translates values while checking indentation, nested keys and interpolation variables. Validated es.yml returns to a Rails load check, replacing a YAML error with “Rails I18n Loaded - 0 Errors”.
Interpolation locked%{name}   %<count>d
Nested paths preserveddashboard.notifications.other
Plural keys protectedzero   /   one   /   other
The cost of a broken dictionary

One bad indent.
There goes your deploy.

Your Rails app relies on config/locales/*.yml for everything from sign-in screens to billing emails. Those files aren't loose collections of sentences. Their keys, whitespace and interpolation tokens are part of your application's contract.

Generic AI translators treat that contract as editable text. A renamed key breaks a lookup. An altered %{user_name} breaks interpolation. A tab or badly escaped quote turns a language update into I18n::InvalidLocaleData when Rails loads the file. Now the release is waiting while an engineer hunts through a YAML diff.

Translate the copy. Keep the model out of your schema.

Generic translation / example failure modes
greeting: → saludo: A renamed key breaks the lookup.

I18n.t("greeting") still asks for the original key. Rails doesn't translate your Ruby code to match.

%{name} → %{nombre} The interpolation argument no longer matches.

Your app passes name:. The translated string asks for something else.

space indentation → tab indentation Malformed YAML fails before the view renders.

A syntax error in a locale dictionary becomes a Rails loading problem, not just a bad translation.

A hard boundary around your syntax

Your keys aren't copy.
Neither are your variables.

Qopywriter separates translatable string values from the YAML structure before the AI gets to work. The result is YAML localization for Ruby on Rails that respects the same boundaries your application does.

  • Lock tokens before translation

    Native Rails tokens such as %{name}, %{user_name} and %<count>d stay byte-for-byte protected. Custom literal tokens like %user_name get the same treatment.

  • Keep every lookup path in place

    greeting: stays greeting:. So do the nested namespaces your controllers, views and mailers already call.

  • Validate before export

    Indentation, quote escaping and key structure are checked as a separate integrity step. A fluent translation is not enough. The YAML must pass, too.

A scanning beam translates the literal-token example from English to Spanish. Shields cover greeting:, %user_name and %count, leaving these three tokens unchanged while the sentence changes. The locale header maps from en to es. Native Rails runtime interpolation uses forms such as %{user_name} and %{count}, which receive the same protection.

Nested means nested.

From activerecord.errors.models.user to a dashboard label, key hierarchies retain their names and indentation depth. No flattened namespaces. No translated lookup keys.

Plural keys aren't prose.

zero, one and other remain structural keys. Locale-specific branches such as few and many receive their own wording, not copies of an English plural.

Parser-safe strings.

Localized quotes, colons and Unicode receive YAML-safe escaping. Space-based indentation stays consistent. Your new language doesn't introduce a new parsing problem.

Correct syntax is only half the job

Valid YAML.
Copy that sounds native.

A dashboard isn't a vocabulary list. “Workspace,” “billing” and “seat” mean something specific in your product. Our Ruby on Rails localization AI reads strings in their key context and carries that terminology across user dashboards, account settings and transactional messages.

Short buttons stay direct. Errors explain what to fix. The AI delivers human-level linguistic accuracy without turning a friendly product into a formal instruction manual halfway through the interface.

Pluralization needs both language and runtime logic. Your Rails I18n backend selects the branch; the AI writes natural copy for each one. Configure the target language's rules through rails-i18n or your own backend, with the categories that locale requires. Existing plural keys stay protected.

config/locales/es.yml Spanish example 
es:
  dashboard:
    greeting: "Hola, %{name}"
    notifications:
      zero: "No tienes notificaciones nuevas."
      one: "Tienes %{count} notificación nueva."
      other: "Tienes %{count} notificaciones nuevas."
Rendered dashboard preview locale: :es
Hola, Ana
count: 0

No tienes notificaciones nuevas.

count: 1

Tienes 1 notificación nueva.

count: 5

Tienes 5 notificaciones nuevas.

Spanish Rails YAML with a native name interpolation token and protected zero, one and other pluralization keys. The dashboard preview shows the corresponding strings for zero, one and five notifications.
From source file to pull request

Keep your Rails workflow.
Lose the YAML cleanup.

Rails I18n translation management doesn't need another layer of busywork. Translate Rails translation dictionaries, review the diff and keep shipping through Git.

  1. Upload your YAML dictionary

    config/locales/en.yml

    Start with the file your app already uses. The parser checks the locale root, nested schema and interpolation tokens before translation begins.

  2. Choose your target language

    en → es / fr / de / ja

    The AI translates values in context, keeps product terminology consistent and handles each plural branch separately. Protected syntax stays outside the translation pass.

  3. Download. Diff. Deploy.

    config/locales/es.yml

    Download validated YAML with the target locale header. Review the changes, add the file to your repository and run your normal Rails checks before merging.

A check worth keeping in your release

Test the dictionary in your own app.

Add :es to your existing config.i18n.available_locales list, then load the Spanish example above. Use raise: true to surface missing lookups, and exercise more than one count.

For locale and backend configuration, go straight to the Rails I18n guide.

# Load the YAML, then exercise the runtime contract.
bin/rails runner '
  I18n.backend.load_translations
  I18n.with_locale(:es) do
    puts I18n.t("dashboard.greeting",
      name: "Ana", raise: true)
    [0, 1, 2, 5].each do |count|
      puts I18n.t("dashboard.notifications",
        count: count, raise: true)
    end
  end
'
Pricing

Start with one dictionary.
Grow with your product.

Try a real YAML file first. Choose a character allowance when you're ready to ship more languages.

Lite

$9/ month

400,000 characters
per month

  • Advanced AI translation
  • YAML structure protection
  • Interpolation token shielding
  • 100+ languages
Free Trial

Starter

More room
$19/ month

1,000,000 characters
per month

  • Advanced AI translation
  • YAML structure protection
  • Interpolation token shielding
  • 100+ languages
Free Trial

Business

$49/ month

3,000,000 characters
per month

  • Unlimited team members
  • Advanced AI translation
  • YAML & token protection
  • Priority support
Free Trial

Yearly

Save 25%
$169/ year

12,000,000 characters
per year

  • Unlimited team collaboration
  • Advanced AI translation
  • YAML & token protection
  • Priority support
Free Trial
Developer questions

Rails questions.
Practical answers.

A Ruby on Rails translation tool needs to respect both sides of the contract: what your users read and what your code expects.

Talk through your Rails setup
How do I translate Rails YAML I18n files?

Upload your source dictionary, such as config/locales/en.yml, and select the target language. Download the translated YAML with the matching locale root, review the diff and add it to config/locales. Include the locale in your Rails configuration and run your I18n checks before merging.

Are %{name} and %<count>d protected?

Yes. The translator locks %{name}, %{user_name}, %{count} and format tokens such as %<count>d before translating values. Natural word order changes with the language; the token names, delimiters and format specifiers do not.

What prevents I18n::InvalidLocaleData?

Malformed YAML, including tab indentation or a broken quoted string, triggers this error when Rails loads locale data. Qopywriter validates YAML before export and protects its structure throughout translation. Missing lookup keys are a separate failure, so the translation flow also preserves key paths rather than relying on parsing alone.

Does it handle zero, one, other and complex plurals?

Yes. Pluralization keys remain structural keys, while their values receive separate, locale-aware translations. Rails chooses the branch at runtime. Configure the target locale's pluralization rules through rails-i18n or your own backend, and supply the categories that locale needs, including two, few and many.

Does the locale root change from en to es?

Yes. Selecting Spanish maps the locale header from en to es as a controlled configuration change. Application keys below that header, such as dashboard.greeting, keep their original names and nesting. The locale identifier changes; your lookup contract does not.

How good is the translation for SaaS interfaces?

The AI translates meaning and product context, not isolated words. It distinguishes a billing “seat” from a chair, keeps dashboard terminology consistent and writes natural error messages with human-level linguistic accuracy. Review the translated screens for fit and brand voice as part of your release process.

Do we need to replace our Rails I18n setup?

No. Keep I18n.t, your Rails backend and your Git review process. Qopywriter is a web app localization tool that translates dictionary values and returns YAML files. Your application remains responsible for locale configuration, runtime plural selection and rendering.

Can I test a YAML dictionary before paying?

Yes. Use the free trial with a small source dictionary. Include nested keys, interpolation tokens and a plural block, then load the result in your Rails app. Paid plans start at $9 per month.

Next locale. Same application contract.

Ship the language.
Not the localization bugs.

Start with config/locales/en.yml. Translate the words your users see, protect the syntax your Rails app needs, and put the result through your next pull request.

Translate your first YAML file Discuss your localization workflow with us