Last updated: April 30, 2026
This page explains how AI From Japan researches, tests, and writes the reviews you read on this site. The goal is full transparency — both so you can trust the recommendations, and so you can flag anything that falls short.
Our Mission
AI From Japan exists to give English-speaking readers honest, Japan-specific reviews of AI tools, VPNs, password managers, and related digital products. Most international reviews miss the practical realities of using these products from inside Japan: which credit cards work, which apps support Japanese-language input correctly, which servers actually have low latency on Japanese fiber. Our entire reason for existing is to fill that gap with first-hand experience, not generic specs.
How We Test Products
1. Real-World Use, Not Spec Sheets
Every product we review is tested as a real user would use it. We do not write reviews based on press releases, advertised feature lists, or YouTube demos. If a review claims that a service “works seamlessly with Mizuho Bank,” it’s because we’ve personally logged into a Mizuho account through it.
2. Minimum 30-Day Testing Period
Before a product appears in a review, we use it for at least 30 consecutive days. For larger reviews (NordVPN, NordPass, ChatGPT Plus, Bunpro), the testing period is typically 6 months to over a year — and the review is updated when major changes happen.
3. Multi-Device Testing
All major reviews are tested across at least three platforms: an iPhone, a MacBook (macOS), and a Windows PC. This catches platform-specific bugs that single-device reviewers often miss.
4. Real Japanese Network Conditions
Network-related testing (VPN speed, eSIM connectivity, cloud sync performance) is conducted on real Japanese infrastructure: NURO Hikari fiber at home, SoftBank and ahamo mobile networks, Shinkansen Wi-Fi, and station hotspots. We test at multiple times of day and report ranges, not single best-case numbers.
5. Honest Reporting of Failures
If a product fails on a specific Japanese site, app, or use case, we say so explicitly. Every review on this site contains a “Cons” or “Honest Warning” section detailing where the product falls short. Reviews without an honest critique are not credible reviews.
How We Cite Sources
When we cite specific facts (pricing, server counts, encryption standards, regulatory information), we link to or reference the source — typically the official product page, an independent audit report, or a recognized news source. If a source can’t be verified, we say so or omit the claim.
How We Handle Updates
Pricing, features, and policies change frequently. Major guides on this site (Best VPN for Japan, Best Password Manager for Japan, AI Tools for Learning Japanese) are reviewed every 3–6 months. The “Last Updated” date at the top of every article is real — it reflects the most recent fact-check, not a publication date.
If we discover an error after publication, we correct it as soon as possible. If the correction materially changes the recommendation, we add a note explaining what changed.
How We Handle Affiliate Relationships
Many of the products we cover have affiliate programs we participate in. These relationships do not influence our editorial decisions. We have published critical reviews of products with active affiliate relationships, and we have praised products that have no affiliate program at all. See our Affiliate Disclosure for the full list of programs we participate in.
How We Handle Sponsored Content Requests
We do not accept sponsored content. We do not publish “guest” articles paid for by brands. We do not allow third parties to write or edit our reviews. If a brand wants to be featured, the only path is to build a good product that we’d actually recommend to a friend.
How to Flag an Inaccuracy
If you spot something that’s wrong — a stale price, a discontinued feature, a factual error — please reach out via the Contact page. We update articles when readers flag genuine issues, and we credit the correction in the article history.
Author
All reviews on this site are written by Ryuyan Kimura, the operator of AI From Japan. There are no ghostwriters and no AI-generated articles published as if they were written by a human. Some articles use AI-assisted editing for clarity, but the testing, opinions, and conclusions are always personal.
For more about the author, see the About page.