EvvyTools Blog
Smart guides, how-tos, and tool deep dives. Better decisions start with better understanding.
Tool Deep Dives
camelCase vs snake_case: How to Pick a Naming Convention You Won't Regret
Naming conventions feel like bikeshedding until a merge conflict or a broken build proves otherwise. Here's how to actually decide.
Financial Literacy
Why Most Online Solar Payback Estimates Are Wrong (And How to Fix Yours)
Most online solar payback numbers use a national average that has nothing to do with your roof, your rate plan, or how you pay for the system.
Health & Wellness
Your Dog Ate Chocolate: How to Read the Toxicity Math Before You Panic
Not every chocolate incident means an emergency vet visit. Here is how to actually work out the risk in the first five minutes.
Financial Literacy
Why Business Valuation Methods Give Different Numbers for the Same Company
Four valuation methods, four different numbers for the same business. Here's what each one measures and why the gap between them is normal, not a red flag.
Financial Literacy
Why the 3-6 Month Emergency Fund Rule Often Fails
The 3-6 month emergency fund rule is a starting point, not a verdict. Here is what actually should move your number up or down.
Tool Deep Dives
Why Readability Formulas Disagree on the Same Paragraph
Run one paragraph through six readability formulas and you can get six different grade levels. The reason is not a bug, it is math.
Tool Deep Dives
Why Your Robots.txt File Might Be Quietly Blocking Pages You Want Indexed
A robots.txt file is four lines of syntax that can quietly deindex a folder full of pages you actually wanted ranked. Here is how that keeps happening.
Tool Deep Dives
Why AI Detectors Flag Human Writing as AI-Generated
AI detectors are not lie detectors. They measure sentence uniformity and word predictability, and plenty of careful human writers score high on both by accident.
Tool Deep Dives
Why SQL Formatters Disagree on Keyword Case and Indent Style
SQL formatters split on keyword case, comma placement, and indent depth because there is no single SQL style standard, just competing conventions.
Financial Literacy
How to Choose Deck Joist Spacing for Composite or Wood Boards
A framing decision most DIYers skip past that quietly decides material cost, board bounce, and whether your deck passes an inspection.
Health & Wellness
How to Pace a First Marathon Without Blowing Up in the Second Half
Your marathon goal time is a math problem in miles 1 through 3 and a discipline problem in miles 20 through 26. Here is how to get both right.
Financial Literacy
How to Stress-Test Your FIRE Plan Against a Bad Decade Before You Actually Quit the Job
A single average return number is not a plan. Here is how to see whether your FIRE math actually survives a decade that looks nothing like the average.