Articles

Solving everyday tech and lifestyle questions — AI, smartphones, PCs, web, work, and life.

AllAI・チャットボットスマホ・アプリパソコン・ソフトWebサービス仕事・副業暮らし・家事
Illustration of a large refrigerator stuck in the door frame of a narrow entrance
暮らし・家事

Can't get a new refrigerator into your house? 5 delivery routes you should measure before purchasing and what to do if it doesn't fit in when it arrives

The new refrigerator won't pass through the entrance or hallway! We explain the 5 delivery routes you should measure before purchasing (entrance, hallway, elevator, indoor passage, installation space) and 5 things to do if you can't make it on the day of delivery. You can also find out the approximate cost of bringing in a crane and how to cancel or return the product.

鈴木 遥
Illustration of how emails from your own domain are marked as spam by Gmail
パソコン・ソフト

Are emails from your own domain not arriving in Gmail? 5 reasons why emails are marked as spam and how to check SPF, DKIM, and DMARC settings

Explaining the reasons why emails from your own domain are sorted into Gmail's spam folder and how to deal with them. From how to check SPF, DKIM, and DMARC settings to countermeasures that can be taken on the receiving side. With the strengthening of Gmail sender guidelines in 2024, there is an increased risk that unsupported emails will no longer be delivered.

中村 健太
Image of smartphone chat app communication being restricted on Wi-Fi at school/work
スマホ・アプリ

Can't send LINE or Discord via Wi-Fi at school or work? How communication restrictions work and 4 ways to deal with them yourself

The reason you can't use LINE or Discord even though you're connected to Wi-Fi at school or work is because of filtering (communication restrictions) on the network side. Explains the mechanisms of port blocking, DNS filtering, and app-level control, as well as four countermeasures you can take, such as switching to mobile data and using the web version.

佐藤 理香
Image of information leakage risk and safety settings when entering work data into AI chat
仕事・副業

Is it okay to put work data into ChatGPT? Information leak risks and safety settings for each AI service that you should know about for business use [2026 edition]

Is it okay to input work documents and source code into ChatGPT/Claude/Gemini? We will provide an easy-to-understand explanation of the learning policy for each AI service, the opt-out setting procedure, and 5 rules to follow when using the service for business purposes, using the latest information as of March 2026.

高橋 湊
Illustration of Excel spreadsheet and AI chat bubble
パソコン・ソフト

What is ChatGPT for Excel? Explaining how to use the official add-in, what it can do, and when to use it in Japan [2026 version]

An easy-to-understand explanation of how to use the "ChatGPT for Excel" add-in, which was officially announced by OpenAI in March 2026, what it can do, compatible plans, and when it can be used in Japan. We will also introduce the differences between third-party products and alternative methods that people in Japan can now use.

中村 健太
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