Localization testing services for your global audience

Uncovers language, currency, and cultural issues before they impact your customer around the world.

Ensure your app works flawlessly, in every market for every user.

Localizing software for dozens of languages requires finding and managing testers in critical markets with suitable devices. With Testlio’s localization testing services, you gain complete localization coverage with managed in-market testers speaking 100+ languages.

Our approach to localization QA follows three central tenets:

Tap global localization experts.

Fully vetted and fluent testers conduct functional, UI, language localization, linguistic, and translation quality testing for you.

Test on real devices in the wild.

With access to 1000s of real device/OS combinations, we uncover internationalization issues, including UI, RTL, and device-specific performance issues.

Gain human-led insights.

Our experienced testers and engagement managers identify gaps and report subtle language, cultural, technical, regional, and inclusivity factors.

Localization testing use cases

Top 5 Photo & Video App

Challenge: Ensure customers have a localized, inclusive, and culturally appropriate experience in 45+ countries.

Solution: Comprehensive app localization testing, inclusivity testing, and internationalization validation for multi-channel touchpoints: apps, web properties, app stores, marketing materials, support channels, documentation, and more.

160 localization testers
45+ languages
370+ devices/OS combinations tested
Captured linguistic and sentiment feedback for a better CX

Professional Basketball Association

Challenge: Expand a U.S. professional basketball cultural offering with country-specific characteristics to accommodate local fans throughout the world.

Solution: Validate SKU and live streaming packaging in local languages/currencies plus blackout testing in key country-specific geos to ensure a flawless global fan experience.

130+ localization testers
70+ countries
270+ device/OS combinations tested
Increased market share with localized offering

Top OTT Streaming Media Platform

Challenge: Our client’s in-house QA team exceeded its capacity for localization verification for applications and packaging as the company expanded into EMEA, AMER, and APAC countries.

Solution: Testlio created localization and bug verification workflows and conducted tests for native language subs and dubs voice testing within critical markets.

50+ localization testers
10+ languages
45+ device/OS combinations tested
Prevented churn by enabling users to engage in their preferred language

Testlio has made our user experience a competitive advantage. They ensure our app meets customers’ expectations no matter where they are located or what device they are on.
Mark Shaw, CTO (and co-founder), Strava

What We Test

Localization software testing ensures your app adapts to a global audience.

Functional Localization Testing

UI localization issues such as elements overlapping and truncations
App functionality, including matching translations to UI functions
Untranslated texts
Inclusive by design validation

Language Testing

Grammar, spelling, punctuation issues, and inaccurate translations
Currency, symbols, pricing, and payments
RTL evaluation
Client-specific app terminology

Linguistic & Translation Testing

Unnatural translations
Quality and consistency, such as specific words translated the same across the app
Idiomatic testing, ensuring consistent tone and giving content feedback on cultural relevance and accuracy