Apex Overlay for Instantly.ai
Get more positive replies from the same client campaigns — automatically
Apex Overlay connects to Instantly and changes the chance of each variant being sent — up when it’s earning positive replies and engaging leads, down when it’s generating unsubs, spam reports or negative replies. In real time, from day one. No manual A/B testing. No campaign changes. Just more replies from the same lists.
Your campaigns, inboxes, sequences, and copy stay completely unchanged. The only thing that changes is the chance of each variant being sent.
The Problem
Your data got better.
Your testing didn’t.
75% of sends go to emails that stopped working
Your worst email gets the same chance of being sent as your best until you manually intervene. By then the damage is done — and you have to explain underperformance to a client.
Yesterday’s winner is today’s loser
Reply rates shift week to week. By the time you check and manually adjust across 5, 8, 10 client campaigns, hundreds of leads have seen your worst copy. Every hour of manual checking is an hour not spent on new clients.
Different buyers need different emails
A VP and a Director respond to completely different angles. Manual testing across segments across multiple client accounts is impossible at volume. You end up with one winner for the whole list and miss segment-level intelligence entirely.
Half your “opens” are bots
Security scanners fire clicks within milliseconds. Instantly counts them as engagement. Your variant decisions are made on data that’s up to 31% noise — which means you might be scaling the wrong winner for your clients.
Apex Overlay fixes all of these automatically.
How It Works
4 steps. See it work.
Connect Instantly
Paste your API key to start. See all your workspaces in one dashboard.
Click “Optimize”
- Pick any campaign and flip the Optimize switch.
- Apex reads your email variants and starts tracking which ones get real replies.
- Your campaign keeps running on its existing schedule — nothing changes on your end.
Learn in real time
Every positive reply and engaged lead increases the chance that variant gets sent. Every unsubscribe, spam report or negative reply decreases it. Bot activity filtered by latency before any decision is made. Your team sees the chances change in real time — no manual intervention required.
See the results
Campaigns typically start showing clear allocation shifts within hours. Persona analytics show which variant works for which audience — which angles win for VPs vs Directors, Marketing vs Operations. The data your agency can show clients that competitors can’t.
Your campaigns, inboxes, and sequences stay untouched. Only the send distribution changes.
+10-15% replies vs A/B Testing standard
See it work on a live campaign — 34 seconds
Simulate Your Campaign
Enter your campaign numbers to see what equal split is currently costing your clients.
Apex Overlay
Auto-Optimization Engine
See exactly how this plays out — variant by variant, day by day, across your client campaigns →
Like what you see? Try it on your real campaigns.
Try it on your next campaignOutcomes
More replies. Less waste.
More replies without writing new copy
Your best email already exists. Apex continually increases the chance it gets sent — so your clients get better results from the same copy they’ve already approved.
Stop wasting leads on emails that don’t work
Underperforming variants are throttled before they burn through your client’s list or damage their sending domain. The campaign stability that keeps clients on retainer.
Show clients exactly what’s working
Persona breakdowns, winner identification, uplift data. Which angle worked for which seniority level across your client’s audience. The report that justifies the retainer and differentiates your agency from every other Instantly shop.
Apex Overlay is a variant intelligence layer for Instantly.ai cold email campaigns. It connects via API key in under 2 minutes and changes the chance of each variant being sent based on real replies, engagement, unsubs, and spam reports. No code changes, no migration — your campaigns stay exactly the same. The Freemium plan includes unlimited workspaces, unlimited campaigns, and unlimited learning. No credit card required.
Freemium plan — available this month
Connect this month and the Freemium plan is yours forever. No card required. After this month, plans start at £49/mo.
Start free →Connects to Instantly in under 2 minutes · Cancel anytime · Full pricing details →
FAQ
Top questions
No. Apex Overlay sits on top of Instantly. Your campaigns, inboxes, warmup, and sequences stay exactly the same.
No — it helps. By dialing down emails that get ignored and sending more of what gets replies, your overall engagement improves. Better engagement means better sender reputation.
The more variants & sends the better, but the algorithm works best with at least ~600 sends per week. Below that, learning just takes a bit longer.
Every open, click, reply, and spam report is tracked in real time. Bot activity is filtered out automatically so only real human engagement counts. Emails that get genuine replies earn more sends. Emails that get ignored or flagged get fewer.
Yes. Lead data is processed temporarily to adjust send percentages only — automatically cleared on Stop/Pause, deleted every 30 days, and fully purged on account closure (GDPR compliant).
Privacy-first:
- Company names anonymized during processing
- Lead PII never stored long-term
- API keys encrypted at rest + in transit (AES-256)
- No third-party sharing, you control all data flows
Your Instantly/Smartlead data stays in your account—we only see engagement signals.
Stop sending your best client leads your worst email.
Takes 2 minutes. No contract. Disconnect in one click.
Our product integrates with Instantly.ai via API. Instantly.ai is a third-party platform and is not affiliated with or endorsing this product.