Transparent Pricing
Straightforward rates that stay consistent as you add more inboxes, no surprise fees or confusing "add-ons".
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Give clients confidence with real proof of progress: placement trends, before/after performances, and ongoing monitoring that keeps deliverability strong, long after audits.
Trusted by 500+ Leading Cold Email Teams
Peeker gives you inbox-level visibility across every sender and client, so you can pinpoint what's hurting placement, track performance trends over time, and back every client recommendation with data.
Client Proof
Turn deliverability work into client-ready evidence. Peeker helps you package what changed, what moved, and what improved into clean, easy-to-explain reporting, so clients see progress backed by data.
Data On What Changed & When
Deliverability is rarely one big problem, it's a series of small shifts. Peeker aligns performance changes with key events (new domains, volume increases), so you can easily defend your recommendations.
Develop Proven Playbooks
Run fixes like controlled experiments, not guesswork. Compare segments and sending sources with consistent measurement, then turn winning changes into repeatable playbooks for clients.
Stock up on inboxes the smart way: clear costs, fast provisioning, and scaling without babysitting.
Straightforward rates that stay consistent as you add more inboxes, no surprise fees or confusing "add-ons".
Skip the slow, manual work. Get inboxes provisioned and organized faster so campaigns can go live without delays.
Inboxes come properly configured for cold emailing so you see fewer issues, smoother ramp-ups, and more stable sending.
Peeker allows you to connect your various sequencers like Instantly, Email Bison, PlusVibe or Smartlead via API keys.

Track inbox performance using real-time deliverability insights to know which inboxes are healthy, underperforming, or burned.
When an inbox gets burned, Peeker automatically swaps it for a fresh and healthy one. No manual intervention, no downtime, no paused campaigns.
Average Reply Rate
Inboxes monitored in real time
Burned domains replaced
Peeker gives deliverability experts what others don't: fast setup, real tracking, and inboxes that actually land in primary.
Everything you need to know before getting started with Peeker.