Available on GitHub Marketplace

Hi, I'm Bool
Your AI Engineering Teammate.

I catch bugs, suggest refactors, write your test cases, and keep your docs current — all as inline GitHub suggestions your team can review and apply.

Add Bool to GitHub → See plans
Works on every PR automatically Per-org pricing, not per seat No config required
What Bool does

Four hats, one engineer.

I join your pull requests wearing whichever hat the code needs — reviewer, refactorer, test engineer, or doc writer.

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Code Review
Bool as: Senior Reviewer

I read every diff, understand the context from surrounding files, and post specific inline comments on the lines that matter — bugs, edge cases, security issues, and antipatterns.

B
bool-ai bot just now
42
- user = db.query("SELECT * FROM users WHERE id=" + userId);
42
+ user = db.query("SELECT * FROM users WHERE id=?", [userId]);
SQL injection vulnerability. String concatenation with user-supplied input allows an attacker to modify the query. Use a parameterised query instead — I've suggested the fix above.
♻️
Refactoring
Bool as: Architect

When I spot code that works but could be cleaner — a long function, duplicated logic, a clumsy loop — I post an inline suggestion your team can apply with a single click.

B
bool-ai bot just now
18
- const result = items.filter(i => i.active).map(i => i.name).filter(n => n.length > 0);
This chain is doing two passes over the array. You can consolidate into one with a reduce or simply reorder so filter(n => n.length > 0) is applied first on the name. Suggestion:
suggestion
const result = items.flatMap(i => (i.active && i.name.length) ? [i.name] : []);
🧪
Test Generation
Bool as: QA Engineer

I look at new methods and classes in your PR and generate meaningful unit tests — covering the happy path, edge cases, and error conditions — posted directly as inline suggestions.

B
bool-ai bot just now
New method calculateDiscount(user, cart) has no tests. Here are three cases worth covering:
suggestion
@Test void shouldApplyLoyaltyDiscount() { var user = new User("alice", Tier.GOLD); var cart = Cart.of(100_00); assertEquals(90_00, calculateDiscount(user, cart)); } @Test void shouldReturnZeroDiscountForGuest() { assertEquals(0, calculateDiscount(null, Cart.of(50_00))); }
📄
Documentation
Bool as: Tech Writer

Undocumented methods and classes are a tax on every engineer who comes after. I generate Javadoc-style documentation at the method and class level, inline on the PR — ready to commit.

B
bool-ai bot just now
OrderService.processPayment is undocumented. Suggested Javadoc:
suggestion
/** * Processes payment for the given order. * * @param order the order to charge; must not be null * @param method payment method to use * @return a {@link PaymentResult} with status and transaction ID * @throws PaymentException if the gateway rejects the charge */
How it works

Three steps. Zero config.

Bool is running on your team in under a minute. No infrastructure, no webhooks to configure, no secrets to manage.

🔗
1
Install the GitHub App
One click on GitHub Marketplace. Select the repos you want Bool on. Done.
📬
2
Open a Pull Request
Your team works exactly as before. Bool receives a webhook the moment a PR is opened or updated.
💬
3
Bool reviews it
Inline comments, suggestions, tests, and docs appear directly on the PR diff within seconds.
Plans & Pricing

One price per org. Not per seat.

Your whole team uses Bool. You pay for the org, once — regardless of how many engineers are on the team.

Free
$ 0
Start reviewing smarter, at no cost.
15 reviews / week
  • Code review on every PR
  • Refactoring suggestions
  • Inline GitHub suggestions
  • All repositories in your org
Get started free
Most Popular
Pro
$ 19 /mo
For teams that ship tests alongside code.
125 reviews / week
  • Everything in Free
  • AI test case generation * Java only
  • Happy path + edge case coverage
  • Apply tests with one click
Start Pro →
Business
$ 39 /mo
For teams who take their docs as seriously as their code.
Unlimited reviews
  • Everything in Pro
  • Method-level Javadoc generation
  • Class-level documentation
  • Priority support
Start Business
Why Bool

Built different.

Most AI review tools are wrappers around a prompt. Bool is engineered to behave like a thoughtful colleague — not a linter with opinions.

🏢
Per-org pricing
One flat price for your entire organisation. Not per seat, not per repo. Add ten engineers tomorrow — your bill doesn't move.
⚡
Automatic on every PR
No manual trigger, no slash commands. Bool shows up the moment a pull request is opened or updated — same as any team member.
🎯
Inline GitHub suggestions
Comments land exactly on the line they're about. Apply a suggestion with one click — no copy-paste, no back and forth.
🧩
Multiple capabilities
Review, refactor, test, document — four engineering roles in one install. Unlock more as your team grows.
🔍
Context-aware analysis
Bool reads surrounding files before commenting on a diff. No comments about things that are fine — just the things that matter.
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GitHub-native
Installed as a GitHub App. No external dashboards, no new tools to learn. Everything happens where your team already works.