AI Bug Fixer — Powered by Claude Sonnet 4.5

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Paste your stack trace. Ripper returns the root cause and a ready-to-apply patch — no formatting, no context-switching, no Stack Overflow tabs.

ripper — bash

READY

$ ripper fix

# Paste your error...

Traceback (most recent call last):

File "app.py", line 42, in get_user

NameError: name 'user' is not defined

>> Analyzing

''' ROOT CAUSE '''

user referenced before assignment.
Refactor residue — renamed to current_user

''' FIX '''

+ current_user = get_current_user(request)

✓ Fixed in 3.1s

buggy-order.js

38394041424344

async processOrder(orderId) {

const order = await getOrder(orderId);

const user = await User.findById(order.userId);

user.getProfile(); // throws!

const profile = user.profile;

}

+ await user.fetch(); // <-- ripper fix

✓ applied

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Ripper diagnoses

Claude Sonnet 4.5 analyzes the root cause and writes the minimal patch. You get a two-sentence diagnosis before the patch so you actually learn something.

Copy. Ship. Win.

Get the fixed code with a tight explanation. No lectures. No fluff. History is saved so you can search, copy, and reuse fixes across projects.

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Sarah Chen

Senior Engineer @ Stripe

saved 3 days

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hundreds of fixes

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Jordan Patel

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team-wide adoption

"Wrote a script to diff our production error logs before/after Ripper. First month: 83 bugs caught automatically, 0 false positives. Accuracy is genuinely impressive — it's learned our codebase."

Tomasz Wierzbicki

Platform Lead @ Notion

83 bugs, 0 false positives

Sub-5-second fixes

Claude Sonnet 4.5 returns surgical patches before you switch tabs. The average fix time across all users is under five seconds.

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Designed to read raw exceptions. No formatting required. Paste the raw output from your terminal, no cleanup needed.

Private by default

Your code is never used to train. Each fix is a fresh session. We don't store, analyze, or learn from your errors.

Root-cause first

Get a two-sentence diagnosis before the patch lands. You debug faster when you understand what's actually broken.

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Every fix saved automatically. Search, copy, and re-use across projects. Your debugging history is always one search away.

Multi-language

Python, JavaScript, TypeScript, Go, Rust, Java, C#, Ruby, PHP, Swift, and more. One tool for your whole stack.

How Ripper stacks up

No subscriptions, no seat limits, no context window theatrics. Here's the deal.

	Ripper $19/mo View pricing →	Cursor $20/mo	GitHub Copilot $10/mo

Target use	Bug fixing only — paste error, get fix	General-purpose AI coding assistant	General-purpose AI coding assistant

Fix speed	< 5 seconds — single-turn diagnosis + patch	Multi-turn chat; Agent Mode adds latency for complex fixes	Tab-completion speed; multi-file fixes require back-and-forth

Stack-trace input	Raw paste — no cleanup, no formatting needed	Works but optimized for code, not error logs	Works in chat but expects conversational context

Bug-fixing specialty	Built for this. Root-cause diagnosis first, patch second.	Agent Mode handles multi-file fixes — powerful but broad	Inline suggestions + PR review; not purpose-built for bugs

Context window	Full error + relevant code — no arbitrary cap	10,000 tokens — best-in-class for large codebases	~2,000–4,000 tokens depending on plan

Multi-file fixes	Handles cross-file bugs in one pass	Composer handles multi-file — best-in-class	Limited; requires manual orchestration

Autonomy model	AI diagnoses → patches → you review. No babysitting.	Agent Mode: full autonomy on multi-step tasks	Human-in-loop; AI suggests, human applies

Free tier	Full access for 14 days, then $19/mo	1,000 requests/mo on free plan	60 completions on trial

Team / seat limits	Unlimited seats — same flat price	$40/user/mo for Business	$19/user/mo for Business

Privacy	Code never used to train; fresh session per fix	Privacy mode on Business plan (code not stored)	IP indemnity included on Business/Enterprise

Fix history	Auto-saved, searchable across all projects	Snapshot history on Pro	Limited to Copilot Chat conversation history

Key differentiator	Purpose-built for one job: kill the bug and explain why it happened	Autonomous multi-file Agent Mode — best generalist AI coder	Deep GitHub + IDE integration; strongest enterprise compliance

* Prices as of June 2026. Cursor shown at $20/mo (Pro plan). Copilot shown at $10/mo (individual). Business plans for both charge per seat. Full pricing details →

// Live Demo

Paste an error. Get a fix.

Watch the full loop — from raw stack trace to patch ready to apply.

ripper — bug-fixing CLI

$ ripper fix

Paste error (raw stack trace):

TypeError: Cannot read properties of undefined

at processOrder (/app/controllers/order.js:47)

at async handleCheckout (/app/routes/checkout.js:118)

>> Analyzing

▼ Root cause

Line order.js:47 calls user.getProfile() before await user.fetch() completes.

▼ Suggested fix

const user = await User.findById(order.userId); await user.fetch(); // <-- add this // existing: user.getProfile() called too early

>> Fix applied. Test run passed.

Paste error Raw stack trace — no cleanup needed

AI diagnoses Root cause in seconds

Fix applied Copy-paste patch, test run

// developer flow

Four steps from crash to commit.

No setup. No config. No getting lost in a chat thread. Just paste, get the fix, ship.

Paste your error

Drop in a stack trace, compiler error, or broken code snippet. Ripper handles raw, messy input — no cleanup, no reformatting.

// your input

TypeError: Cannot read property 'map' of undefined

at async parseItems (inventory.js:142)

Ripper analyzes

Claude Sonnet 4.5 traces the root cause, identifies the exact failure point, and builds a fix tailored to your stack.

// root cause

items

is not initialized before the async call.

Line 142 expects an array — it's

receiving undefined from the DB layer.

Fix proposed

You get a diagnosis first — so you actually learn what broke — then the minimal, targeted patch. No surrounding code touched.

// patch

+ const items = await db.getItems(cartId)

// Add fallback: items ?? []

Applied. Shipped.

Copy the fix, paste it in. Done. Fix is auto-saved to your history — searchable across all projects, forever.

// result

✓ Fix applied — 0 errors, 0 warnings

Saved to history.

Ready when you are.

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From crash to commitin three moves.