The archive · Developer & Business Tools · Product decision · 2025–2026
Sonarly bets an AI on-call engineer can fix alerts before humans: YC W26 launch
Two-person YC W26 startup builds an AI engineer for production: connects to Sentry/Datadog, filters alert noise, root-causes and fixes issues to cut MTTR.
Sonarly (Mirabelle)
What the business is
An AI engineer for production: connects to observability tools like Sentry and Datadog, deduplicates and filters alerts, produces root-cause analysis, and triggers coding agents to open fixes.
How it started
Dimittri Choudhury and Alexandre Klobb previously ran Meoria, an edtech app with 100,000+ users, pushing several deploys a day while fielding up to 50 Sentry alerts with a two-person team. They started Sonarly during YC's Winter 2026 batch, first rebuilding a noise-free Sentry-like tracker, then pivoting to an 'AI engineer for production' that layers on top of the monitoring tools companies already run.
What happened
The founders launched self-serve on Hacker News in February 2026 during the batch: Sonarly connects to Sentry, Datadog, Grafana and Slack, deduplicates and filters alerts, assigns severity, builds a dynamically updated markdown map of the production system, then hands coding agents like Claude Code the exact issue and logs to open fixes. One Sentry user's ~180 daily alerts collapsed to ~50 grouped issues and ~5 worth a human's attention. By mid-2026 Sonarly reported 78% root-cause accuracy versus 53% for a raw agent, with a free tier plus a ~$150/month startup plan.
How it ended up
Still early: as of mid-2026 Sonarly was a two-person company with free self-serve signup, paid plans and a handful of design partners; no revenue figures disclosed.
Background
Sonarly is a two-person Y Combinator Winter 2026 (W26) startup selling an 'AI engineer for production': software that connects to a team's existing observability stack — Sentry, Datadog, Grafana, Slack — watches for alerts, and does the work of a human on call. Founders Dimittri Choudhury and Alexandre Klobb came from Meoria, an edtech app with 100,000+ users, where two people handled up to 50 Sentry alerts a day across multiple daily deploys.
Their first attempt rebuilt a Sentry-like tracker without the noise, but they pivoted after discovering companies don't want to add a new tracker or change their monitoring stack. Sonarly now sits above existing tools: it deduplicates and filters alerts, assigns severity, and maintains a dynamically updated markdown map of each customer's production system, then hands coding agents like Claude Code the exact issue and logs needed to open a fix — cutting mean time to repair (MTTR).
The founders launched self-serve in February 2026 during the YC batch. Reported results include one Sentry user going from ~180 alerts a day to ~50 grouped issues to ~5 worth human attention, and a mid-2026 claim of 78% root-cause accuracy versus 53% for a raw agent wired directly to monitoring tools. The pitch is that nobody wants 'an agent' — they want the 3am page to stop and a fix waiting in review by morning.
What has to be true
- Alert fatigue is an on-call tax: Sonarly's founders experienced it directly (up to 50 Sentry alerts a day with a two-person team), making the problem real rather than theoretical.
- The differentiation is defensible: 78% root-cause accuracy comes from triage and a living map of the system, not a smarter model — raw agents score 53% in their tests.
- The product rides an existing install base: it layers on Sentry, Datadog and Grafana instead of asking teams to change their monitoring stack.
- The business model is familiar developer SaaS (free tier, ~$150/month startup plan), so adoption can spread from one engineer instead of a procurement cycle.
What can be applied
An agent startup's moat can be the unglamorous preprocessing: triage plus a living map of the system beat a raw model — context engineering, not the model, is the edge.
Aftermath
As of September 2026, Sonarly remains a two-person company operating under parent name Mirabelle. Its product is live with self-serve signup, free and paid tiers, and integrations with Sentry, Datadog, Grafana, Slack, Discord, Linear, GitHub and PagerDuty. The founders continue to iterate publicly — including a Hacker News launch and an August 2026 follow-up on The Agent Times — but disclose no revenue figures.
Sources
- Sonarly (YC W26): The AI Engineer That Answers the 3am Page
- Sonarly — YC W26 Launch on Hacker News (Launch HN mirror)
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