"Error log" and "mistake notebook" get searched separately, but they describe the same idea: a running record of what you got wrong and why. The real question isn't which term is correct — it's which format you'll actually keep filled in three weeks from now.
Notebook: lower friction to start, harder to search
A physical notebook needs nothing but a pen — no template to find, no app to open. That makes it the easiest format to start today. The tradeoff shows up later: you can't sort a notebook by error type, can't filter to just this week's entries, and counting how many times "careless" shows up means flipping through pages by hand. It works well for students who mainly want to re-read specific mistakes before a test, and poorly for students trying to spot patterns across dozens of entries.
Spreadsheet: more setup, but it's built for finding patterns
A spreadsheet (Google Sheets, Excel, or a CSV imported into Notion) takes a few minutes to set up but pays that back the first time you sort by error type or filter to one subject. This is the format worth using if the goal is genuinely spotting which mistake repeats — which, if you're reading a guide about error logs, is probably the goal. See the free spreadsheet template if you want to skip building one from scratch.
Software that logs and analyzes it for you
The limitation of both notebooks and spreadsheets is the same: the analysis is manual. You have to remember to sort, remember to filter, remember to compare this week to last week. A tool built specifically for this — like StudyMaze — logs each mistake the same way a spreadsheet does, but builds the heatmap and error-type breakdown automatically, so the pattern is already visible instead of something you have to go dig for.
So which one should you use?
- Want the absolute lowest barrier to start today, and mostly want to re-read old mistakes? Use a notebook.
- Want to actually filter and sort your mistakes, and don't mind five minutes of setup? Use the spreadsheet template.
- Want the pattern-finding done for you, automatically, every time you log a mistake? That's what StudyMaze is for.
Whichever you pick, the format matters less than whether you keep using the same error-type labels every time — see how to start an error log for the six things worth tracking regardless of format.