The case that started it all
Every voice AI engineer has lived through the same incident. A production call batch fails. Twilio logs say status=completed. ElevenLabs says the TTS generated successfully. Vapi says the session closed normally. No error anywhere — and yet callers experienced silence, dropped calls, or an agent that started speaking and abruptly stopped.
Reconstructing what actually happened requires pulling data from three separate dashboards, manually correlating timestamps with a ±500ms drift window, and writing the incident timeline into a Slack thread by hand. For a team already context-switched on an incident, this takes 2–3 hours.
That is the problem Sherlock Calls solves. Ask in Slack: 'What caused the call failures between 9 and 11 AM today?' Sherlock pulls the evidence, correlates the providers, and delivers a sourced case file — in the same thread where your team is already coordinating.
What shipped in v0.1
The initial release is a full-stack application built on Next.js 16, Supabase, Stripe, and Anthropic Claude.
Slack-native AI investigation — Sherlock listens to Slack threads and DMs. Ask anything about your calls in plain English and get a sourced, multi-tool answer. No new UI to learn.
Multi-provider correlation engine — A single investigation spans multiple providers simultaneously. Sherlock correlates events across telephony (Twilio), voice AI (ElevenLabs, Vapi, Retell), CRM (HubSpot), and observability (Datadog) in one answer.
Supabase auth — Slack OIDC and Google OAuth. Workspace-level access control so your whole team can investigate, not just the person who set it up.
Stripe billing — Free Starter plan (8,000 credits, no card required) and paid Team plans for higher volumes. All plan management through Stripe with server-side verification.
Marketing landing page — Hero, features, integrations carousel, pricing, case studies, and blog. Built to convert voice AI engineers who land from search.
Why Slack, not a dashboard
Voice AI incidents do not happen in dashboards. They are reported in Slack: 'calls are dropping', 'our bot is not responding', 'the ElevenLabs latency spiked again'. The investigation happens in the same Slack thread — pasting in call SIDs, error codes, and log excerpts while the on-call engineer context-switches between five browser tabs.
We made Slack the native surface for Sherlock by design. The investigation starts where the incident is reported. The answer lands where the team is already coordinating. No context switch. No 'go check the dashboard' loop. The case closes in the thread where it opened.
This also means Sherlock is usable by everyone on the team — ops managers, support leads, RevOps — not just engineers who know where to look in Twilio Console. That is the access gap we are closing.
Building in public from day one
We are documenting this build openly. Every Monday, we will publish what shipped, what we learned, and what broke. This is week one.
The next posts will cover the provider integrations, billing infrastructure, the interactive demo, and the SEO and GTM work running in parallel with the product.
If you run voice AI in production and want to try it: add Sherlock to your Slack workspace at usesherlock.ai. It takes about 90 seconds to connect your first provider.
Elementary, my dear engineer.
Frequently asked questions
What is Sherlock Calls?
Sherlock Calls is an AI investigation tool for voice operations teams. Connect your Twilio, ElevenLabs, Vapi, Retell, and other voice providers, then ask questions in plain English from Slack — 'why did our calls fail this morning?' — and get a sourced, multi-provider answer in under 60 seconds.
Who is Sherlock Calls for?
Voice AI engineers and telephony operations teams who run production call stacks across multiple providers. If you have ever spent 2 hours manually correlating Twilio call SIDs with ElevenLabs session IDs to diagnose a silent failure, Sherlock is built for you.
Is Sherlock Calls free?
Yes — the Starter plan is free with 8,000 credits, no credit card required. That covers a meaningful volume of investigations. Paid Team plans are available for higher credit volumes.
Ready to investigate your own calls?
Connect Sherlock to your voice providers in under 2 minutes. Free to start — 100 credits, no credit card.