You will get Japanese Mobile App Usability & Localization Testing
Project details
Native Japanese freelancer specializing in mobile app usability & localization testing for the Japanese market. With 15+ years in premium retail management, I optimized customer experiences and operations using PDCA cycles. Retired in June 2025, I now freelance in spot consulting, on-site market research, and mystery shopping—delivering fast, precise results.
My service stands out by combining practical customer insight with native cultural fluency. Recently, I completed a full test for the PictureThis plant care app (iOS, Japanese). As a real user, I followed the script, captured annotated screenshots of issues (e.g., unnatural subtitle lacking particles, inconsistent kanji, pushy premium text, unclear terms like "滝水"), and delivered a detailed Excel report with step-by-step findings, problems/causes, and correction proposals (Japanese copy + English rationales on tone, politeness, clarity, common usage). Client approved quickly.
I focus on natural polite tone, cultural fit, and actionable fixes to boost retention/conversion. Testing on iPhone 13 via Japanese App Store, I provide developer-ready suggestions with user-first thinking.
My service stands out by combining practical customer insight with native cultural fluency. Recently, I completed a full test for the PictureThis plant care app (iOS, Japanese). As a real user, I followed the script, captured annotated screenshots of issues (e.g., unnatural subtitle lacking particles, inconsistent kanji, pushy premium text, unclear terms like "滝水"), and delivered a detailed Excel report with step-by-step findings, problems/causes, and correction proposals (Japanese copy + English rationales on tone, politeness, clarity, common usage). Client approved quickly.
I focus on natural polite tone, cultural fit, and actionable fixes to boost retention/conversion. Testing on iPhone 13 via Japanese App Store, I provide developer-ready suggestions with user-first thinking.
Testing Platform
Website Testing, Mobile Testing, Software Testing, Game TestingDevice
PC, Mac, iPhone, iPadLanguage
English, JapaneseWhat's included
| Service Tiers |
Starter
$35
|
Standard
$60
|
Advanced
$95
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 4 days |
Number of Revisions | 1 | 2 | Unlimited |
Number of Pages Tested | 5 | 15 | 99 |
Screen Recording Time (Minutes) | 0 | 5 | 10 |
Test Scenario | |||
Summary Report | |||
Annotated Screenshots | |||
Test Desktop | - | - | |
Test Mobile |
5 reviews
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PM
Pamela M.
Dec 23, 2025
Japanese Usability/Localization Tester – Plant Care App
WH
William H.
Nov 15, 2025
Submit Selfies, Get Paid! Help AI Facial Recognition Model Training
great work
TR
Tanushree R.
Nov 11, 2025
Simple Image Collection Task – Japanese or Korean
It was great working with Yuki. He handled the project efficiently and completed everything within the agreed timeframe. Highly recommended and best wishes for future projects!
GR
Giovanna R.
Nov 18, 2024
App Ambassador in Japan - Mystery Shopper
Yuki did a fantastic job. He's reliable and communicated really well all throughout the project. I highly recommend him and look forward to working with him again in the future.
HS
Haruhito S.
Oct 1, 2024
Quick Japanese Task(10min.) for 5 Stars Review
Yuki maintained clear communication and delivered exactly what was requested. I'll definitely hire him for future projects.
About Yuki
Japanese AI Evaluator | Market Research | Consumer Insights Specialist
86%
Job Success
Koganei, Japan - 1:23 am local time
I help global companies improve AI systems, evaluate Japanese content, and better understand Japanese users through detailed and practical analysis.
Experienced in AI evaluation, Japanese market research, app testing, and eCommerce operations.
Native Japanese professional with extensive experience in retail operations, consumer behavior, eCommerce, and AI evaluation support.
I have over 20 years of hands-on experience in Japanese retail and store management, including customer service, merchandising, staff coordination, inventory management, and local consumer analysis.
Currently, I also work on AI-related evaluation and data annotation projects involving:
- Japanese language evaluation
- AI response rating
- Search result evaluation
- Social media ad evaluation
- Data labeling and quality review
In addition, I have experience with:
- Japanese market research
- eCommerce product research
- App and website testing
- Japanese localization support
- Consumer insight analysis
- Online marketplace operations (eBay, EC platforms)
Why clients work with me:
- Native Japanese communication
- Strong understanding of Japanese consumers and culture
- Detail-oriented and reliable work style
- Fast response and professional communication
- Ability to provide practical business insights, not just translations
I am especially interested in:
- AI training/evaluation projects
- Japanese market research
- Consumer behavior analysis
- Localization/testing projects
- Retail and eCommerce-related tasks
Available for both short-term and long-term projects.
Steps for completing your project
After purchasing the project, send requirements so Yuki can start the project.
Delivery time starts when Yuki receives requirements from you.
Yuki works on your project following the steps below.
Revisions may occur after the delivery date.
Initial Setup & Access Verification
Review provided app link/credentials & test script. Install on Japanese App Store via iPhone 13. Verify full access (including premium if needed) and confirm understanding of focus areas. This mirrors my PictureThis project preparation.
Real-User Testing & Issue Capture
Test as a native Japanese user (with my retail background in customer.） Follow script or custom flows, capture annotated screenshots of issues (e.g., unnatural tone, layout breaks, cultural mismatches). Record key flows if requested.