I18n Studio 
I18n Studio is a free macOS localization application for translating JSON, XML, Localizable.strings, and String Catalog files with context-aware AI assistance and integrations for Xcode, VS Code, and Android Studio. Developers should review terminology, variables, markup, plural rules, and UI fit in every target language.
Starting price Free + API costs
Tool Information
I18n Studio is a free macOS localization application for translating JSON, XML, Localizable.strings, and String Catalog files with context-aware AI assistance and integrations for Xcode, VS Code, and Android Studio. Developers should review terminology, variables, markup, plural rules, and UI fit in every target language.
Begin with authorized, non-sensitive inputs and a limited test. Configure available quality, privacy, access, export, disclosure, and spending controls; compare results with source material and real requirements; correct errors; and keep a responsible person in control before publishing, contacting people, or changing consequential records.
The macOS application is free to download and uses the user’s own API key. Model-provider usage charges therefore apply separately.
AI output may be inaccurate, generic, biased, incomplete, unsafe, or visually defective. Check privacy, retention, model training, copyright, consent, security, automatic renewal, refunds, and commercial-use terms, and require qualified human review for health, hiring, education, advertising, or other high-impact work.
F.A.Q (3)
Pros and Cons
Pros
- Provides an interface dedicated to translating software localization files
- Supports Apple's Localizable.strings format
- Works with modern Apple String Catalog files
- Handles JSON and XML localization resources
- Supports projects built for iOS; Android; and JavaScript ecosystems
- Fits alongside Xcode; Visual Studio Code; and Android Studio workflows
- Can translate one selected value without rewriting the whole file
- Can translate a key across several target languages
- Can process an entire language column when bulk work is needed
- Can translate all loaded entries in one operation
- Uses contextual comments to tell the model when text should not be translated
- Context can describe scenes and intended capitalization
- Lets users bring their own model API key
- Advertises GPT-4-backed translation assistance
- Runs on macOS 11 or later and is available as a free download
- Writes translations back into familiar source-control-friendly project files
Cons
- The desktop application is available only for macOS
- Users must obtain; secure; and pay for their own model API access
- Sending interface strings to an external model can expose unreleased product information
- Machine translations can miss cultural nuance and domain-specific terminology
- Plural forms; gender rules; variables; and placeholders require careful manual testing
- Bulk writing can create noisy source-control changes or damage formatting if not reviewed
- A model can translate tokens; keys; or markup that should remain unchanged
- The public page does not prominently describe translation memory support
- No comprehensive terminology glossary workflow is evident from the feature overview
- Professional linguistic review is still necessary for high-stakes releases
- Translation speed varies with file size; provider latency; and API limits
- A free application can still generate substantial usage charges through the connected API
- Provider model changes can alter translation style between releases
- Windows and Linux developers need a different workflow or access to a Mac
- Context comments must be maintained to remain useful as screens change
- Supporting a file format does not guarantee correct rendering in every target application
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Overview
Before you subscribe
- Check the currency, billing period, automatic renewal, usage limits and seats at checkout — prices and promotions change.
- App-store pricing can differ from website pricing by country, device and tax.
- Share only authorised data, and read the provider's encryption, retention and model-training terms first.
- AI output can be incomplete or wrong. Verify facts, citations, calculations and code before you publish or ship.
- Commercial usage rights vary by plan, provider terms and jurisdiction.
- None of these tools replaces a qualified professional for medical, legal or financial decisions.
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