EvvyTools Blog
Smart guides, how-tos, and tool deep dives. Better decisions start with better understanding.
Health & Wellness
Why Your Daily Calorie Target Depends on More Than Your Weight and What TDEE Actually Captures
Two people at the same weight can have daily calorie targets that differ by 700 calories. Learn what TDEE actually measures and how to read its output.
Tool Deep Dives
How to Write Portable Markdown That Renders the Same Across GitHub, Notion, and Your CMS
Markdown is portable in theory and brittle in practice. Here are the rules that keep a file rendering the same wherever you paste it.
How-To Guides
How to Tell if Your Net Worth Is on Track for Your Age
A practical walkthrough for turning your assets and liabilities into a single percentile-ranked snapshot you can act on.
Financial Literacy
How to Put a Real Dollar Value on Your W-2 Benefits Before Quoting a 1099 Rate
Most freelancers underprice their first 1099 rate because they only adjust for taxes. Here is how to value the rest of the W-2 package.
How-To Guides
How to Tell If a Number Is Prime Quickly by Hand (and When to Stop Guessing)
Divisibility rules, a square-root ceiling, and a short list of small primes is almost always enough to tell whether a number is prime by hand.
Tool Deep Dives
How to Write a Content Brief That Survives the Draft
A brief that survives the draft constrains the parts a writer is most likely to freewheel on. Here is what to put in it and what to leave out.
Financial Literacy
How to Build a Debt Payoff Plan That Hits a Real Date
A practical walkthrough for turning a stack of statements into a single payoff schedule with a calendar date attached.
Financial Literacy
What Happens to Your 401(k) When You Change Jobs: Your 4 Options
When you leave a job your 401(k) does not vanish, but it does not move on its own either. Here is how to choose between four real options.
Tool Deep Dives
Why AI Content Detectors Disagree on the Same Text and What Their Scores Actually Measure
AI content detectors give different scores on the same passage. Learn what they measure, why they disagree, and how to read a score without fooling yourself.
Tool Deep Dives
How to Diagnose a Failing Cold Email Before You Hit Send
Audit your cold email draft against the seven dimensions that decide whether it gets opened, read, or trashed before you send.
How-To Guides
How to Identify an Unknown Material by Measuring Its Density
A practical guide to identifying a mystery material using only a scale, some water, and the density values you can look up in any reference table.
Financial Literacy
Why Most Freelancers Get Hit With an Underpayment Penalty And How Safe Harbor Fixes It
Most freelancers do not realize the IRS charges a penalty for paying taxes annually instead of quarterly. The safe harbor rule is the fix.