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The same 10% of take-home pay weighs differently for someone living alone in Tokyo and someone living with family. Using Japan's household and housing surveys, I generate a standard household for your family size and prefecture, and judge what share of your actually-free money goes to AI. Part 3 of the series.
So my AI spending is 7.7 times the average. But whether that's too much depends on the ratio to income. Using rent benchmarks and the 50/30/20 rule, I work out what percentage of take-home pay AI can take, with a checker inside the post. Part 2 of the series.
I pay over 44,000 yen a month for ChatGPT, Claude, Cursor and the rest. How much does everyone else pay? Comparing survey data and user reports to work out whether I'm overdoing it. Part 1 of the series.
ChatGPT, Claude, Gemini. Before agonising over which one to pay for, ask whether the free tier's limits are eating your time. A simple rule for deciding when to start paying for AI.