Engineering notes begin with an actual build, failure, or release task.
AI ENGINEERING · RELIABLE SHIPPING · DECISION TOOLS
Test the system.
Ship with evidence.
Engineering guides, AI research, and free planning tools for independent builders. Every page must solve a concrete problem and expose its sources, assumptions, and limits.
EDITOR'S PICK
OpenAI Plans to End Cursor Model Access: What Developers Should Prepare Before November 12AI · 9 min read · A verifiable bilingual release workflowCHOOSE BY CURRENT PROBLEM
What are you trying to solve today?
Start with the path closest to today's task, then continue through the series or tool.
AI COSTI need to control LLM spending
Turn measured tokens, cache rates, and traffic into a monthly budget.
→SSH ACCESSMy remote access is brokenDiagnose keys, authorization, host identity, and recovery in order.
→RELIABLE SHIPPINGI want to ship a site I can maintainBuild a publishing path with evidence, SEO checks, and recovery gates.
→CASH BUFFERI need a clearer financial planCompare runway, one-off risk, current savings, and a realistic target.
→External facts link to primary sources, with facts, analysis, and unknowns kept distinct.
Pages show review dates; material that cannot be maintained reliably leaves the public index.
START HERE
Choose what you need next
01 · Tools
How to Subscribe to ChatGPT on iPhone for Codex: A Safe, Region-Aware Guide
A practical guide to checking Codex eligibility, using Apple Account balance, subscribing in the ChatGPT iOS app, and avoiding region, gift-card, and duplicate-charge problems.
Read the note →02 · EngineeringHow to Turn Vercel Web Analytics Into Better Content Decisions
A practical measurement plan for small content sites: verify the collection window, compare pages and visitors honestly, connect acquisition to useful actions, and change one content path at a time.
Read the note →03 · MoneyHow Much Emergency Fund Do You Need? A Practical Sizing Framework
Move beyond a generic three-to-six-month rule with a staged method based on essential spending, income risk, insurance gaps, and access to cash.
Read the note →KNOWLEDGE SPACE
Built to publish.
Organized to be found again.
Use search, learning series, controlled concepts, and a timeline to enter maintained knowledge without depending on the homepage feed.
Open the knowledge library ↗SEARCHSearch problems and sections directly
Search titles, body sections, series, and concepts with mixed English and Chinese queries.
→SERIESComplete a topic in orderFollow a recommended sequence or jump directly to the step you need today.
→CONCEPTSConnect related knowledge across seriesUse a controlled vocabulary with enough supporting material instead of an unbounded tag cloud.
→TIMELINESee how the library evolvesBrowse by first publication date and check each page's latest substantive review.
→USEFUL STARTING POINTS
Start with one concrete question
01
Turn analytics into content decisions
Verify the measurement window, then improve content from acquisition, reading, and next-step evidence.
Open page →02Build a trustworthy content site
Move from maintainable architecture and editorial evidence to production verification and ongoing review.
Open page →03LLM API cost calculator
Compare input, cached-input, output token cost, and monthly budget capacity.
Open page →04Emergency fund calculator
Build a cash-buffer target from essential spending, income risk, and current savings.
Open page →05Civilization VII strategy desk
Browse maintained guides for leader pairings, empire management, land and naval war, Age transitions, and victory paths.
Open page →06Health habits checklist
Turn sleep, movement, food, mental wellbeing, and prevention into small actions with clear evidence limits.
Open page →DEEP RESEARCH
Go beyond the update.
Follow the evidence.
Long-form reports on AI systems, software delivery, and financial resilience for independent builders—with scope, sources, limits, and maintenance triggers made explicit.
Explore the research library ↗CORE TOPICS
Practical systems for independent builders
02⌘
Engineering
Ship software with release evidence, recovery paths, and maintainable architecture.
Explore →RECENTLY UPDATED
Latest maintained notes
✦FIELD NOTE / 001
OpenAI Plans to End Cursor Model Access: What Developers Should Prepare Before November 12
OpenAI says it intends to wind down its Cursor model contract after SpaceX acquired the coding-tool company. Here is what is confirmed, what remains uncertain, and how teams can reduce model-provider lock-in now.
Read the note ↗AWS Agent Toolkit in the CLI: A Practical Guide to Skills, MCP, IAM, and Safe Rollout
Tencent Hy4 Preview Explained: What 770B and a 1M Context Window Actually Change
Civilization VII Age Transitions: What to Build, Bank, and Stop
Civilization VII Leader and Civilization Combinations: A Three-Age Matching Method
A solo maker's publishing checklist for useful technical articles
INDEPENDENT · ACCOUNTABLE
Publish less.
Prove more.
aifincode is built and maintained independently by Luo Jie. AI may assist research and checks, while the author remains responsible for topics, sources, facts, code, and every publication decision.
Meet the author and method ↗