Blog
Engineering notes from the team building i18nagent.ai and i18n-convert.
Build Country-Aware Address Forms for International Apps
Design country-aware address forms that preserve valid international input and keep mobile clients, APIs, validation, and display formatting aligned.
Keep Map Labels and Geocoding Aligned With Your App Language
Prevent mixed-language map screens by aligning labels, geocoding requests, fallbacks, and locale-keyed caches with the language selected in your app.
Count and truncate user text by grapheme cluster
Count and truncate Unicode text by grapheme cluster across iOS, Android, web, and backend limits without splitting accents or joined emoji during input.
Localize measurement units without forcing metric or imperial
Learn how to choose, convert, and format localized measurement units in mobile apps without overriding user preferences or losing precision.
Measure app localization with effective-locale analytics
Track the language your app actually renders, keep analytics events stable, and build locale funnels that survive language changes and fallbacks.
Prevent locale-sensitive case conversion bugs in apps
Separate linguistic casing from stable identifier normalization, handle Turkish I correctly, and test locale-sensitive case conversion across app boundaries.
Build Accent-Insensitive Search for Multilingual Apps
Build accent-insensitive app search with Unicode normalization, locale-aware matching, consistent indexes, safe highlighting, and a practical test matrix.
Add On-Device Translation for User-Generated App Content
Build on-device translation for user messages and reviews with model-download controls, source preservation, offline behavior, and reliable verification.
Handle Grammatical Gender in Personalized App Messages
Model grammatical gender in personalized app messages with typed inputs, translator-owned variants, safe fallbacks, and cross-platform release tests.
Keep Speech Recognition Aligned With an App's Language
Keep voice input aligned with your app language across iOS and Android. Handle locale changes, offline support, failures, and typed input fallback.
Prevent Missing Glyphs With a Multilingual App Font Fallback Chain
Build a multilingual app font fallback chain that covers every script, preserves shaping, survives font subsetting, and catches glyph failures before release.
Build Locale-Aware Sorting for Multilingual Apps
Fix multilingual app search and sorting with locale-aware collation, stable keys, accent rules, and tests that keep user lists predictable across languages.
How to Localize an App Clip Without Losing Locale Context
Build an App Clip localization workflow that keeps card metadata, target resources, invocation URLs, and the full-app handoff in the same language.
Prevent Android App Bundles From Dropping Language Resources
Stop Android App Bundle language splits from breaking in-app locale changes. Choose a delivery strategy, inspect release APKs, and test missing resources.
Keep app widgets localized after language changes
Prevent iOS and Android widgets from showing stale or device-language copy after an app language change with a clear refresh and test workflow.
Localize Authentication Emails and Account-Action Links
Keep verification, password reset, and recovery emails aligned with your app locale, then preserve that language through secure account action links.
Localize Dynamic App Content Without Mixing It With UI Strings
Separate dynamic app content from bundled UI strings with explicit locale negotiation, versioned caches, offline fallback, and release-ready tests.
Localize iOS Live Activities Across the Lock Screen and Dynamic Island
Keep iOS Live Activity copy consistent across the Lock Screen, Dynamic Island, push updates, accessibility labels, and app language changes.
Migrate an Android Language Picker to Per-App Language Preferences
Migrate an Android language picker to per-app language preferences without losing saved choices, breaking older devices, or desynchronizing Settings.
Localize iOS App Shortcuts Without Breaking Siri Discovery
Build a reliable App Intents localization workflow for Siri, Spotlight, and Shortcuts, with bundle ownership, translator context, and release tests.
Localize App Store Keywords by Market, Not by Literal Translation
Localize App Store keywords by market with a field-level workflow for research, translation, release checks, and query-led ASO iteration across stores.
Ship Over-the-Air App Translation Updates Without Breaking Bundled Fallbacks
Build an OTA localization path that validates source versions, swaps files atomically, preserves bundled fallbacks, and survives offline app starts.
Migrate Localizable.strings to String Catalogs Safely
Migrate Localizable.strings and .stringsdict files to Xcode String Catalogs while preserving translations, review states, variations, and rollback options.
Build a Locale Mapping Layer Across App Code, Stores, and Translation Systems
Build one app locale mapping layer for code, resource files, App Store Connect, Google Play, and translation systems without broken fallbacks.
Preserve Locale Context Across Mobile Deep Links
Keep localized mobile deep links in the intended language across cold starts, saved app preferences, authenticated routes, redirects, and web fallbacks.
Localize App Display Names and Launcher Labels Across iOS and Android
Localize iOS and Android app display names without launcher fallback, generated-build drift, or mismatches between installed apps and store listings.
Share iOS Localization Across App Targets and Swift Packages
Learn how to share iOS localization across app targets, extensions, and Swift packages without duplicate catalogs, missing keys, or bundle lookup bugs.
Localize API Error Messages Without Coupling Apps to Server Copy
Learn how to localize API error messages with stable codes, app-owned copy, structured parameters, safe fallbacks, and tests for every locale.
Localize App Permission Prompts and Privacy Rationale
Build a localization workflow for iOS purpose strings and Android permission rationale, then test grant, denial, and retry flows in every app locale.
Localize In-App Purchase and Subscription Metadata
Localize in-app purchase names, descriptions, and prices without duplicating store data. Build one workflow for App Store and Google Play paywalls.
Support right-to-left languages without breaking app UI
Build reliable RTL app localization with logical layouts, intentional icon mirroring, mixed-text handling, gesture checks, and an LTR regression matrix.
Localize app dates, times, and numbers without hardcoded formats
Fix hardcoded app dates, times, numbers, currencies, and time zones with a locale-aware formatting boundary, typed data model, and practical test matrix.
Handling App Translation Text Expansion and UI Overflow
Learn how to manage text expansion in app localization. Use flexible constraints and pseudo-localization to prevent UI truncation in German and French.
Prevent Missing Translations with Fallback Languages
Learn how to configure robust language fallback chains to prevent technical keys or blank UI spaces when app translations are missing or delayed.
Stop Concatenating Strings: Why App Localization Requires Message Formatting
String concatenation breaks translated app localization grammar and plurals. Learn how to implement message formatting for reliable software translation.
Validate Formatting and Plurals During AI App Localization
Learn how to validate formatting, variables, and plurals when using AI to translate UI strings, effectively preventing crashes in iOS and Android apps.
Unify Developer and Translator Workflows Through Git-Based Localization
Stop syncing localization spreadsheets. Learn how to unify developer and translator workflows using Git branches, pull requests, and CI/CD automation.
Localize App Push Notifications for Global Campaigns
Localize app push notifications using server-side techniques and payload best practices to boost engagement and prevent broken deep links for global users.
Hand Off App Strings to Vendors Without Creating Source Drift
Learn how to hand off app strings to localization vendors using structured formats like XLIFF without losing source context, string IDs, or creating drift.
Add Accessibility Checks to Your App Localization QA
Visible copy may be translated while screen-reader labels and language metadata remain wrong. Add accessibility checks to each locale's QA matrix.
Measure Localization Throughput Without Rewarding Bad Output
Measuring translation speed hides stale targets and rework. Track source-to-reviewed cycle time and first-pass integrity for accurate localization metrics.
Design a Localization Rollback Plan for Broken Releases
Learn how to build a localization rollback plan to quickly withdraw a bad locale, listing, or resource bundle without reverting your entire codebase.
Choose App Locales From Store Data Instead of Guesswork
Stop guessing which locales to translate. Learn how to use App Store and Google Play data to prioritize app localization for visibility, growth, and ROI.
Define Localization Ownership Across Product, Engineering, and Review
Define localization ownership across product and engineering teams. Establish accountability for source readiness, translation integrity, and launches.
Localize Release Notes Across App Store and Google Play
Release notes often arrive late and are disconnected from the product translation cycle. Learn how to localize release notes without delaying your app update.
Control Source String Changes Without Leaving Stale Translations
Learn how to manage source string changes and translation drift. Use source fingerprints to mark targets stale and require review after copy changes.
Build an AI Translation Review Workflow That Humans Can Audit
AI translates text quickly but makes review harder. Learn to separate structural checks from linguistic approval and build a safe, auditable workflow.
Give Translators Enough Context for Ambiguous UI Strings
Learn how to provide adequate context to translators for ambiguous UI strings to prevent costly localization errors and improve user experience.
Automate Localized App Store Screenshots Without Manual Retakes
Learn how to automate localized app screenshots for iOS and Android. Generate consistent, translated store assets with deterministic UI tests.
App Localization Release Workflow: UI, Store Listings, and Screenshots
Build an app localization workflow that coordinates UI copy, store listings, screenshots, review, and release QA without leaving stale locales behind.
We built an i18n format converter that covers 32 formats. Here's what we learned about the ones nobody talks about.
Releasing i18n-convert v0.3.0, a Rust CLI that converts losslessly between 32 localization formats. Notes on the strange ones: xcstrings, ARB, NEON, HJSON, iSpring XLIFF.