You built it with AI. Now keep it running.
Know when your app breaks — and understand why, in plain English. One command: npx upflag init
$ npx upflag init
✔ Detected: Next.js project "my-app"
✔ API key validated
✔ Monitor created for https://my-app.com
✔ Error alert snippet added to app/layout.tsx
Monitoring active. Errors → upflag.io/dashboard/errors
Your /checkout page is broken.
The payment form can't load — a required piece of data is missing. 12 visitors hit this in the last hour.
Sentry shows you a stack trace.
Upflag tells you your checkout page is broken.
Other tools send alerts meant for platform engineers. Upflag sends alerts anyone can read — so you can fix what matters without decoding cryptic logs.
TypeError: Cannot read properties of undefined
(reading 'stripe_customer_id')
at getCheckoutSession (./src/lib/checkout.ts:42:18)
at async handler (./src/app/api/checkout/route.ts:15:9)
at async /node_modules/next/dist/server/…
Event ID: a4f8c2e1-9b3d-4e7f-b6a1-2c8d9e0f1a3b
Environment: production | Release: 1.4.2-beta.3
Browser: Chrome 120.0.6099.130 | OS: macOS 14.2
Your /checkout page is broken.
The payment form can't load — a required piece of data is missing from the customer record. This started 14 minutes ago.
Suggested fix: Check that the user's Stripe customer ID is set before loading the checkout form.
Same error. One requires a senior engineer. The other makes sense to everyone on the team.
Built for builders using Cursor, Claude Code, Lovable, Replit, Bolt, and v0.
You ship fast with AI tools. Upflag keeps up — plain-English alerts that tell you what broke, where, and how to fix it. No DevOps background required.
Everything you need to keep your app running.
One command. Done.
Run `npx upflag init` in your project. Upflag detects your framework, adds error monitoring, and creates an uptime check. Setup takes seconds, not hours.
Plain-English error alerts.
When your app breaks, Upflag tells you what went wrong in words you understand. Not a stack trace. Not a log file. A clear explanation of what broke and where.
Uptime monitoring built in.
Add your endpoints. Upflag checks them every 30 seconds to 5 minutes. When something goes down, your status page updates automatically.
Public status pages.
Give your users a clean, real-time status page. Custom domains on paid plans. It shows live status, incident history, and a subscribe button.
Alerts that keep everyone in the loop.
Your team gets notified the moment something breaks. Your users get incident updates via email. Everyone knows what's happening.
Built for AI builders.
You built your app with Cursor, Claude Code, or Lovable. Upflag speaks your language. Paste any error into your AI tool with one click.
How Upflag compares
One tool that replaces the stack you were about to duct-tape together.
| Upflag | UptimeRobot + Sentry | PostHog | Better Stack | |
|---|---|---|---|---|
| Plain-English error alerts | ||||
| Status pages | Ugly defaults | |||
| One-command setup | ||||
| Price | $15/mo | $29 + $26/mo | $0 + usage | $29/mo |
| Built for AI builders |
vs UptimeRobot
Tells you your server is up. Upflag tells you your app is actually working.
vs Sentry
Sends you a stack trace. Upflag tells you your checkout page is broken.
vs PostHog
A heavyweight analytics platform with error alerts bolted on.
vs Better Stack
Monitoring and logging for teams that read log files.
Simple pricing. Everything included.
Free
For side projects and small apps. Get started with monitoring in minutes.
- 3 monitors
- 5-minute check interval
- 1 status page
- 100 subscribers
- 100 error alerts/day
- Email alerts
- 7-day incident history
Starter
For growing teams that need faster checks and more visibility.
- 15 monitors
- 1-minute check interval
- 5 status pages
- Unlimited subscribers
- 1,000 error alerts/day
- Custom domains
- Slack/Discord/Webhooks
- 90-day incident history
Pro
PopularFor teams that need maximum reliability and advanced controls.
- 50 monitors
- 30-second check interval
- 20 status pages
- Unlimited subscribers
- 10,000 error alerts/day
- Custom domains
- Custom branding
- API access
- Priority support
- 1-year incident history
How this compares:
Questions you'd probably ask.
- What are plain-English error alerts?
- When JavaScript errors happen in your app, Upflag catches them and translates the technical error into a clear explanation. Instead of 'TypeError: Cannot read properties of undefined', you see 'Your checkout page is broken — a piece of code tried to use data that doesn’t exist.' Every alert tells you which page, how many visitors were affected, and what to do next.
- Do I need to know how to read stack traces?
- No. That’s the point. Upflag is built for builders who ship with AI tools like Cursor and Claude Code. If you can paste an error message into your AI tool and ask it to fix it, you can use Upflag.
- How does error monitoring work?
- Add one line of code (or run `npx upflag init` to do it automatically). Upflag’s lightweight snippet catches JavaScript errors in your users’ browsers, groups them, and sends you a plain-English alert. No heavy SDK, no performance impact.
- Do I need a separate monitoring tool?
- No. That’s the whole point. Upflag monitors your endpoints and updates your status page automatically. One tool, one bill.
- What happens when a monitor detects an outage?
- After two consecutive failed checks (to avoid false positives), Upflag creates an incident on your status page and emails your subscribers. When the endpoint recovers, the incident auto-resolves.
- Can I use my own domain for the status page?
- Yes, on Starter ($15/mo) and above. Point a CNAME record to us and we handle SSL automatically.
- Is there really no per-subscriber pricing?
- Really. Paid plans include unlimited subscribers. We think charging more because more people want to know if your service is up is a strange business model.
- How long does setup take?
- Seconds. Run `npx upflag init` in your project and Upflag detects your framework, installs the error snippet, and creates your first uptime check. Your status page is live immediately.
- Can I try it before I pay?
- Yes. The free plan includes 3 monitors, 1 status page, 100 errors/day, and 100 subscribers. No credit card required. Use it as long as you want.
- What’s the difference between Free and Starter?
- Starter gets you faster checks (1 min vs 5 min), more monitors (15 vs 3), more pages (5 vs 1), 1K errors/day (vs 100), unlimited subscribers, custom domain support, and Slack/Discord/webhook integrations. Most solo founders start free and upgrade when they have paying customers of their own.
One command. Your app is covered.
Run npx upflag init and get uptime monitoring, error alerts, and a status page — all in seconds. No config files. No 30-minute setup.
Free plan available. No credit card. Using Claude Code? Just type /upflag init.