Practical guides
for people who
build.
Hands-on guides, honest tool comparisons, and free developer utilities. Every claim is backed by a source or a real test, and the limitations are written down.
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Signal
Guides backed by sources or a real test/
Tools are scouted before they are recommended/
Every guide names what to do differently/
Limitations are written down, not hidden/
Comparisons are hands-on where it matters/
Free utilities you can use in the browser/
Guides backed by sources or a real test/
Tools are scouted before they are recommended/
Every guide names what to do differently/
Limitations are written down, not hidden/
Comparisons are hands-on where it matters/
Free utilities you can use in the browser/
LANE · 01
Read the guides
Technical guides backed by sources, real tests, or explicit limitations.
60 articles
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Free browser utilities for everyday developer tasks.
25 tools
LANE · 03
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Hands-on tool and stack comparisons to help you choose.
comparisons
Prompt Cache Savings Calculator — Will Caching Actually Save You Money?
Model your LLM traffic shape against cache TTL to find your real hit rate, monthly savings, and the break-even hit rate below which prompt caching costs more.
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Your Prompt Tooling Has a Deadline Your Monitoring Can't See
Two vendors are switching off prompt and eval tooling. We probed the live APIs, found no warning headers, and built a scanner that dates every hit.
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OpenAI Spend Limits Return 429: Your Retry Logic Will Make It Worse
OpenAI hard spend limits reject requests with a 429. Lab evidence on why default client retries treat it as a temporary blip, and the one-line fix.
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Your AI Gateway Blocked the Request. Did You Still Pay?
We measured what OpenRouter returns when a request is refused, and whether refused calls still cost money. Ten blocked calls moved the bill by $0.00.
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OpenAI Output Moderation: What the Scores Actually Catch
We asked an AI assistant for a threatening collection letter. It wrote one. Output moderation scored it 0.00008 and let it through. Here is what that means.
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GPT-5.6 Prompt Caching: The 24-Hour Cache Is Gone
GPT-5.6 added explicit prompt cache controls and quietly took the 24-hour cache away. We ran the API and measured what that swap costs.
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