Lovable Bolt v0 Cursor Claude Code

You built it
with AI.
Now let AI
watch it.

AI builders like Lovable and Bolt get you to production fast. DeepTracer picks up from there — monitoring your live app 24/7, catching unhandled errors, API failures, and LLM cost spikes before your users notice.

Start Free — no code needed → See how it works

Monitoring apps built by developers shipping fast with AI

DeepTracer — your app, last night Live

🚀

11:32pm You shipped your app Launched

847 signups on launch day

Agent started monitoring automatically

🌙

3:47am You're asleep Quiet

Your DeepTracer agent is not

⚡

3:47am Checkout errors detected 34 affected

34 new users can't complete payment

100% failure rate on /api/checkout

Investigating automatically...

✦

3:47am Root cause found 1.9s

STRIPE_WEBHOOK_SECRET is missing from your Vercel environment. You added it to .env but forgot to add it to Vercel's dashboard before deploying.

📱

7:02am You wake up to

DeepTracer 7:02 AM

Fixed a checkout error that hit 34 users at 3:47am. Missing STRIPE_WEBHOOK_SECRET in Vercel env — add it in Project Settings → Environment Variables. No data lost.

After you ship

Three things that only
show up in production.

Lovable, Bolt, and Cursor build your app perfectly. But production environments behave differently — real users, real secrets, real costs. DeepTracer catches all three automatically.

01 Most common

The environment variable that's missing in production

Your app uses Stripe, Clerk, or SendGrid — wired up perfectly. But production environment variables have to be set separately in your hosting provider — and it's easy to miss one during deployment.

In your code Stripe payment processing with webhook support — reads from STRIPE_SECRET_KEY

What happens in production

Error: No such customer: 'cus_undefined'

STRIPE_SECRET_KEY is undefined · 100% of checkouts failing

✦ DeepTracer found

STRIPE_SECRET_KEY returns undefined in your Vercel production environment. The variable exists in your .env.local file but was never added to Vercel → Project Settings → Environment Variables.

✓ Caught in 1.4s · fix takes 30 seconds

02 Silent crashes

The edge case that only real users find

The happy path works flawlessly. But real users skip steps, have empty profiles, hit rate limits, and use your app in ways that are impossible to predict upfront.

In your code const avatar = user.profile.settings.avatar.url

What happens in production

TypeError: Cannot read properties of undefined

reading 'avatar' · affects all new users with no profile · 312 crashes

✦ DeepTracer found

312 users hit this crash — all new signups who haven't completed onboarding yet. user.profile is null until the profile setup step is finished. Affects your entire new-user funnel.

✓ Caught in 2.1s · affects 18% of new signups

03 $$ alert

The AI feature that's costing more than you expected

Your app has a chatbot or AI feature — and it's working great. But without cost monitoring, a small bug can call GPT-4 on every keystroke instead of on submit — and your bill runs at $40/hour with no alert.

In your code onChange={() => streamAIResponse(input.value)}

What happens in production

OpenAI spend: $0.80 → $312 in 8 hours

4,891 GPT-4 calls · avg 3.2 calls per user session

✦ DeepTracer found

Your AskAI component fires on every keystroke in the input field — no debounce, no submit gate. At current rate, projected monthly cost: $2,800. Move the call to onSubmit and add a 300ms debounce.

✓ Caught in 1.7s · $2,488 saved per month

Zero config setup

Your app is already on Vercel.
You're halfway there.

Lovable and Bolt apps deploy to Vercel by default. Connect your Vercel project once — no code changes, no redeploy — and DeepTracer starts watching instantly.

The easy way 0 lines of code

Connect via Vercel Log Drain

Every request, error, and function log from your app — automatically forwarded to DeepTracer. No code changes. No new deploys. Just three clicks in Vercel Settings.

Open Vercel Settings

Go to your project → Settings → Log Drains. Takes 10 seconds to find.

Paste your drain URL

Copy the URL from your DeepTracer dashboard and paste it in. Select all log sources.

That's it

Click Save. Your agent starts watching immediately — no redeploy needed.

vercel.com / your-lovable-app / settings / log-drains

Add Log Drain

https://ingest.deeptracer.dev/drain/dt_proj_...

Save

Build

Edge

Serverless

Static

Connected · receiving events

⚡

Coming soon

Install DeepTracer automatically from the Vercel Marketplace — one click from the Vercel integration directory, no URL copy-paste required. We're currently in partner review.

⬡ Want deeper insights?

Add the SDK for LLM cost tracking + traces

If your Lovable app uses OpenAI, Anthropic, or any AI feature, add 5 lines of code to track LLM costs per user, distributed traces, and custom events.

✓ LLM cost per user ✓ Custom events ✓ Distributed traces ✓ User context

View SDK docs →

            instrumentation.ts
            
              1
              // src/instrumentation.ts — add this file
            
              2
              import
               { DeepTracer } 
              from
               '@deeptracer/nextjs'
            
              3
               
              4
              export function
               register
              () {'{}'}
            
              5
                DeepTracer.
              init
              ({'{'}
            
              6
                  
              apiKey
              : 
              process
              .env.
              DEEPTRACER_KEY
            
              7
                })
            
              8
              }

What you actually get

Not an alert.
An explanation.

Every monitoring tool tells you something broke. DeepTracer tells you why it broke, who it affected, and exactly what to change to fix it.

No stack trace archaeology. No Googling the error. No guessing which deploy caused it. Just open the investigation and read the fix.

The same crash. Two very different answers.

Vercel tells you

[ERROR] 500 Internal Server Error
POST /api/checkout 500 in 247ms

↓

DeepTracer tells you

Your Stripe webhook handler throws when
customer.email is null — new OAuth signups
skip email verification. Add a null check on line 47.

See it catch your first error →

TypeError: Cannot read properties of null — reading 'email'

app/api/checkout/route.ts · 34 occurrences · last 2h · 34 users affected

✓ Resolved

Root cause

Users who signed up via Google OAuth skip your email verification step. Your checkout handler assumes customer.email is always set, but OAuth accounts have a null email until the user verifies. The error fires on every checkout attempt for this user group.

Evidence

⚡

100% of affected users authenticated via Google OAuth — confirmed by cross-referencing session data

📍

Error originates at checkout/route.ts:47 — stripe.customers.create({ email: customer.email })

📅

Started 2h ago at deploy d8f3a1c — the Stripe integration was added in this commit

👤

34 users hit the checkout page since deploy. 34 failed. Zero successful checkouts.

Suggested fix

Add a null check before creating the Stripe customer. Fall back to a placeholder or prompt the user to confirm their email before checkout.

app/api/checkout/route.ts · line 44–51

const session = await getServerSession() const customer = await db.user.findUnique(...) - const stripeCustomer = await stripe.customers.create({ - email: customer.email - }) + if (!customer?.email) { + return NextResponse.json({ error: 'Email required for checkout' }, { status: 400 }) + } + const stripeCustomer = await stripe.customers.create({ + email: customer.email + })

⏱ investigated in 2.3s

👥 34 users affected

🛠 3-line fix

📡 via Vercel drain

Pricing

Start free. Upgrade when
your agent needs to work 24/7.

Free tier catches your first errors. Pro turns your agent from reactive to always-on — watching while you sleep.

Free

Reactive Mode

$ 0 / month

Forever free · no credit card required

Get started free

Includes

✓ 1 project
✓ 25,000 events / month
✓ 3 AI investigations / month
✓ 10 AI chat messages / month
✓ 1-day data retention
✓ Vercel log drain
– 24/7 ambient monitoring
– Slack alerts

Pro

Questions from
developers like you.

Does this work with Lovable / Bolt apps? I didn't write the code. +

Yes — that's exactly who DeepTracer is built for. You don't need to understand the code to use it. The Vercel log drain option requires zero code changes: just paste a URL in Vercel Settings and your agent starts watching. If your app is deployed on Vercel (which Lovable and Bolt apps are by default), you're set up in under 2 minutes.

Will it slow down my app or break anything? +

No. The Vercel log drain is completely external — your app doesn't know it exists, so it can't slow it down or cause errors. The SDK adds less than 2ms of overhead per request and is designed to fail silently: if DeepTracer has a problem, your app keeps running normally. We're the safety net, not another dependency that can take your app down.

What exactly is an "event"? Will I hit the 25K limit? +

An event is one log line, one error, one API request, or one LLM call — whichever your app generates. A typical small app with a few hundred users uses 5,000–15,000 events/month, well within the free tier. If you're getting close, we'll warn you and never cut off your data — overages are just $0.50 per 100K extra events.

What's the difference between Reactive Mode and Guardian Mode? +

Think of it like a doctor. Reactive Mode (Free) is a doctor you visit when you notice something's wrong — you trigger investigations manually. Guardian Mode (Pro) is a doctor living in your house, checking in automatically, and texting you the diagnosis before you even know there's a problem. Guardian Mode watches your app 24/7 and sends Slack alerts with the root cause included.

I already use Vercel Analytics. Is this different? +

Very different. Vercel Analytics tracks page views and performance metrics. DeepTracer catches runtime errors, API failures, and LLM cost spikes — the things that make your app broken, not slow. Vercel logs also disappear after an hour. DeepTracer keeps errors for 30 days and tells you exactly why they happened and how to fix them. They complement each other well.

Is my app data secure? What do you do with my logs? +

All data is encrypted in transit (TLS) and at rest. We don't sell your data, share it with third parties, or use it to train AI models. Your logs are yours — we're just storing and analyzing them on your behalf. Free tier data is retained for 1 day; Pro retains logs for 7 days and errors for 30 days. You can delete your data any time.

You built itwith AI. Now let AIwatch it.

Three things that onlyshow up in production.

Your app is already on Vercel.You're halfway there.

Not an alert.An explanation.

Start free. Upgrade whenyour agent needs to work 24/7.

Questions fromdevelopers like you.

Your AI built it. Let AI watch it.

You built it
with AI.
Now let AI
watch it.

Three things that only
show up in production.

Your app is already on Vercel.
You're halfway there.

Not an alert.
An explanation.

Start free. Upgrade when
your agent needs to work 24/7.

Questions from
developers like you.

Your AI built it.
Let AI watch it.