The first real pull request I got from someone outside my own head landed on one of my repos a few weeks ago. Small change, one FAQ item. I opened the diff and caught myself doing something I don’t do when I review my own code: I read it twice, hesitated on wording that would normally not bother me, and then approved it without being able to say exactly why I was comfortable.
That’s when it hit me. I’d been reviewing code for years — mostly my own — on vibes. No system. Just a feeling of “this looks right,” which works fine when you’re the only one who has to live with the consequences, and stops working the moment someone else’s code is going to sit in your repo next to yours.
If you’ve ever caught yourself leaving a review comment, then rewriting it, then rewriting it again because you couldn’t articulate what was actually bothering you — this is for that moment.
TL;DR: I built a free, MIT-licensed code review kit with a 51-item interactive checklist, PR templates, guides, and anti-patterns. No account, no install, no tracking. Try it live →
What I built instead of continuing to guess
I built PR Review Canvas: a free, MIT-licensed code review kit with a 51-item interactive checklist, PR templates, guides for different experience levels, and annotated examples. No account, no install, no tracking.
Here’s what’s in it, why it’s organized the way it is, and the parts I’d point to first if you only have five minutes.
The problem with most code review checklists
Search “code review checklist” and you’ll find two kinds of results: a Gist with twelve bullet points written in 2018 and never updated, or a 5000-word article that covers everything so abstractly it helps nobody.
Neither solves the real problem, which isn’t that developers don’t know that they should check security. It’s that they don’t know what specifically to look for when checking security on a Tuesday afternoon when they have three other PRs in the queue.
A useful checklist does two things: it tells you what to look for, and it tells you why that thing matters. Without the why, a checklist is just a bureaucratic checkbox exercise that slows you down without improving the review.
Every item in PR Review Canvas has a reason attached. Not a vague “best practice” justification — a specific, honest explanation of what goes wrong when you skip it.
What’s in the kit
The live interactive checklist is at projekta2.github.io/pr-review-canvas — open it now in another tab. No install. No account. Works offline after the first load.
Beyond the checklist, the repository contains:
- PR description templates (basic and advanced with risk/rollback sections)
- Reviewer guides for beginners, seniors, giving feedback, and receiving feedback
- Annotated examples of a good PR, a bad PR, and a full review transcript
- An anti-patterns reference — the 12 ways code review silently goes wrong
- Ready-to-paste templates for Notion, Obsidian, Linear, Jira, and GitHub Projects
MIT licensed. Fork it, adapt it, use it commercially.
The 8 categories — and why they’re in this order
The structure isn’t arbitrary. The categories map to the sequence an experienced reviewer’s brain actually runs through:
# Category What it covers 1 Context & Purpose Does the PR explain what changed and why? 2 Architecture & Design Does it fit the existing system? 3 Code Quality Is the code clean, readable, and correct? 4 Testing Are the right things tested? 5 Performance & Security Any obvious risks at scale or security holes? 6 Documentation Is the knowledge preserved? 7 Standards Compliance Does it follow the team’s conventions? 8 Final Considerations Would you approve this at 3am?The order isn’t arbitrary or enforced — you can’t judge architecture before you understand the problem, or code quality before you know where it belongs — but you can jump around if a category doesn’t apply.
Three items I lean on most:
- Context: “You understand the problem this PR solves before reading the code.” Sounds obvious — it isn’t. Reviewers often judge a solution on aesthetics before understanding the problem it’s solving.
- Performance & Security: “New endpoints respect existing authorization rules.” Bypassing a permission check is how privilege escalation happens — the one item that catches what CI won’t.
- Final Considerations: “You’d be comfortable being paged about this code at 3am.” The gut-check that cuts through everything else.
The Review Readiness score
The circular gauge in the sidebar updates in real time as you check items. It goes from 0% to 100% as you work through the 51 items.
What the score means — and what it doesn’t:
The score is a prompt, not a gate. A PR with 40% readiness isn’t necessarily bad — some categories simply don’t apply. A security fix doesn’t need documentation updates. A typo fix doesn’t need performance analysis.
Use it to notice what you haven’t looked at, not to block merges on a number. The category mini-bars in the navigation make it easy to see which areas you’ve covered and which you’ve skipped entirely.
Progress is saved in localStorage. Close the tab and come back — your progress is still there. Nothing leaves your browser.
How to use it — three modes
As an individual reviewer
Bookmark projekta2.github.io/pr-review-canvas and open it alongside your next PR. Run through the categories that apply. When you’re done, use “Copy summary” to paste your progress as a review comment — it generates a plain-text checklist of what you checked and what you skipped.
For a fully offline copy with zero external dependencies, download checklists/interactive-checklist.html directly and open it from your file system.
As a team
- Fork the repository
- Open
checklists/pr-review-checklist-template.md— the blank, editable version - Remove items that don’t apply to your stack; add items specific to your codebase
- Copy
templates/pr-template.mdinto.github/PULL_REQUEST_TEMPLATE.md— every PR starts from the same baseline
The value of a shared checklist isn’t the checklist itself. It’s that when someone leaves a comment saying “this doesn’t handle the empty state,” they can point to a specific item in the shared reference instead of re-explaining their reasoning from scratch. The checklist externalizes knowledge that would otherwise only live in one person’s head — mine, in this case, until someone else’s PR showed up.
As a junior developer
Read guides/for-beginners.md before your first review. It’s written for the exact moment after you’ve been assigned a PR and have no idea where to start. Then use the interactive checklist on a real PR — even if you can only check 15 of the 51 items, those 15 are better than nothing.
The 12 anti-patterns worth knowing
resources/code-review-antipatterns.md is the document I’d have wanted most before I had a system. It covers the recurring ways code review goes wrong on both sides of the diff.
If the interactive checklist feels like something you’d use daily, you might also find PR Focus Pro useful — it sits on top of GitHub and triages PRs before you even open the checklist. Freemium, $9.50 one-time for Pro.
A few anti-patterns that come up most often:
Rubber stamping — approving a PR without actually reading it. Usually happens when the queue is long and the PR is from a senior engineer. The senior’s seniority doesn’t make the code correct.
Scope creep in review — using a code review to relitigate architectural decisions that were already made. A PR review is for the code in the diff, not for the design document from six months ago.
The nitpick spiral — spending 80% of review time on formatting and naming, then approving logic that has a race condition. Linters exist for a reason. Use them and save your review time for what they can’t catch.
Asymmetric feedback — giving harsh written feedback that you’d never say in a conversation. Text strips tone. The phrases that feel neutral when you write them feel aggressive when the author reads them at 5pm on a Friday.
What I learned building it
The “why” matters more than the item. Early versions were just a list. Adding one sentence of reasoning per item made reviewers stop and think “does this reason apply to this PR?” instead of mechanically ticking boxes. That shift in behavior was the whole point.
Offline capability was more requested than I expected. One HTML file with no network dependency turned out to be a real need — but the anti-patterns list is the thing people forward to teammates after a bad review. It names what happens on every team but nobody says out loud, which makes it more shareable than a structured checklist ever will be.
A checklist doesn’t replace judgment — it replaces guessing. I still make judgment calls on every review. The difference is I now know which categories I skipped and why, instead of not knowing what I skipped at all.I’ve been using it myself for six weeks now. The difference isn’t that I catch more issues — it’s that I know which categories I’m skipping and why, instead of not knowing what I skipped at all.
Try it, and tell me I’m wrong
Open the live checklist → · ⭐ Star the repo · Join the Review Swap
Good first issues are open if you want to add a checklist item, a translation, or a template for a tool that’s missing.
What’s the code review anti-pattern you see most often? Or better — what’s missing from this checklist that you wish was there? Drop it in the comments — I’d genuinely like to know.
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