What Sentry is
Sentry is error tracking and application monitoring from inside your code: stack traces, performance traces, session replays, logs, cron and uptime monitors, with Seer, an AI add-on that can open fix pull requests. It needs its SDK installed in the app.
Side by side
- Where it looks from
SentryInside the app, through an SDK you install.
KeelnestOutside: the live site every five minutes, plus read-only connections to Stripe, Supabase, your host and your AI provider.
- Setup
SentryAdd the SDK to the app’s code.
KeelnestStart from the live address. Connections are read-only credentials you create; the error script tag is optional.
- Errors
SentryStack traces, releases, performance tracing and session replay.
KeelnestUncaught errors and failed requests from a small script tag — or your existing Sentry, read through its API.
- Uptime
SentryUptime checks from 1-minute intervals; one monitor on the free plan, then $1 per monitor.
KeelnestHTTP, certificate and headers every 5 minutes on every plan.
- Sign-in and checkout
SentryNo browser journeys in its documentation.
KeelnestJourneys written in plain words and walked in a real browser after every publish.
- Payments
SentryNot found in its pricing or docs.
KeelnestStripe payments against the usual level for that hour of the week, plus webhook health.
- AI spend
SentryModel costs and tokens for the calls your code instruments.
KeelnestThe provider’s own usage and cost reports for OpenAI and Anthropic, spikes caught within two hours.
- Fixes
SentrySeer, an add-on at $40 per active contributor a month, can open fix pull requests.
KeelnestA prompt for your builder on every plan; a pull request on paid plans, merged only when a named person approves.
- Free plan
Sentry5,000 errors, one uptime and one cron monitor, one user.
KeelnestOne app: checks every 5 minutes, every publish verified, one journey walked weekly and after every publish.
- Paid plans
SentryFrom $26 a month (Team); $80 a month (Business).
KeelnestFrom $19 a month (Solo, one app); $29 for three apps; agency plans from $99.
Sentry’s column is from its own pricing page and documentation on 23 September 2026; a dash means we found nothing on it there. Keelnest’s is from our pricing and what Keelnest checks.
Choose Sentry if
- You need stack traces, performance traces and session replays to debug your own code.
- Your team is happy adding an SDK and reading what it sends.
- You want to know the exact line that threw, and in which release.
Choose Keelnest if
- The failures are outside the code — a disabled webhook, a redirect URL, a rate-limited mailer — and never throw at all.
- You want to know when payments stop, not only when code throws.
- You built with a builder, and a stack trace is not the message you need at eleven at night.
Or run both
Keelnest connects to Sentry with a read-only token: an error spike becomes evidence on the Keelnest incident, beside the publish that caused it and the payments it cost. Sentry for the code; Keelnest for everything around it. Most apps are better with both.
Questions
Do I need Sentry to use Keelnest?
No. Keelnest’s error capture is one script tag that reports uncaught errors and failed requests. If you already have Sentry, connect it instead, and its error spikes become evidence on Keelnest incidents.
Does Keelnest replace Sentry?
Not for debugging code. Keelnest tells you what broke for your customers and why, in plain English, across the site, publishes, payments and spend. Sentry tells a developer which line threw.
Both can open pull requests. What is the difference?
Sentry’s Seer works from the errors your code sends it. Keelnest works from production failures it saw itself — a publish that broke sign-in, a key in the bundle — and it verifies the fix on a preview where the host builds one before a named person approves it.
Sources
Read on 23 September 2026. Prices and plans change; if something here is out of date, tell us and we will correct it.