Comparison
Keep Your Chain vs. Instantly, Smartlead and Lemlist: what's actually different
We built Keep Your Chain because we were about to pay for one of these and realised none of them were built for the way we wanted to send. That is not a knock on them. Instantly, Smartlead and Lemlist are excellent at what they are for, and if what they are for is what you need, buy one of them. Here is the difference, as plainly as we can put it.
Two different jobs
The volume tools are built for scale: connect as many mailboxes as you like, rotate sends across them, warm them in a shared pool, track opens and clicks, and push thousands of emails a day for one or many clients. Their customers are agencies and outbound teams whose output is measured in sends.
Keep Your Chain is built for one company selling its own product, from its own mailboxes, to people it would like to keep as customers. Its output is measured in conversations. It sends at most 30 a day per mailbox, insists every follow-up is a reply in the same chain, stops the whole company the moment anyone answers or installs, and never tracks an open.
Side by side
| Instantly · Smartlead · Lemlist (typical) | Keep Your Chain | |
|---|---|---|
| Built for | Agencies and outbound teams; many mailboxes, many campaigns, often many clients | A founder or small team selling one product from their own mailboxes |
| Daily volume | Thousands, by adding mailboxes and rotating | About 30 per mailbox; 180 a day for two people on three domains |
| Follow-ups in the same thread | Available, usually a per-step setting | Always. There is no setting |
| Stop on reply | Per contact; reply detection varies by tool | Per company, from any address that lands in the chain, plus out-of-office handled separately |
| Stop on product install | Not a concept | Built in: your app posts one signed event and the chain stops |
| Which mailbox sends | Rotation across the pool | Your own mailbox, chosen by domain health, with a warning when you shouldn't |
| Open and click tracking | Yes, by default | None, on purpose (no pixels, no rewritten links) |
| Warmup | Built-in pools included | Enforced ramp built in; warmup network from a partner you choose |
| Lead database | Included or bundled in higher tiers | Bring a CSV, or connect Apollo; storefront app detection is built in |
| Multichannel (LinkedIn, calls) | Lemlist especially | Email only |
| Where replies go | Unified inbox in the tool | One inbox in the tool and your real Outlook, because mail goes through your mailboxes |
| Price | From roughly $30–40 a month per seat or workspace, more with warmup and leads | Plans start at $29 a month; third-party programs at cost or bundled |
Competitor descriptions are general and from their public materials as of writing; features and prices change. If we have something wrong, tell us and we'll fix it.
Where the volume tools are simply better
If you run outbound for clients, you need many mailboxes on many domains, a warmup pool you do not have to think about, and reporting per client. If you sell to a huge market with a low price point, you need thousands of sends a day and the math works even at a 1% reply rate. If your motion includes LinkedIn and calls, Lemlist's multichannel sequencing is the point. Keep Your Chain does none of that and does not plan to.
Where the difference actually bites
Three situations we kept hitting with the "many mailboxes, per-contact stop" model. A prospect forwards your email to a co-founder who replies from an address you never emailed — per-contact detection misses it and step three goes out to the original person two days after the company said yes. A store installs your app from the App Store without ever replying — nothing knows, and the sequence keeps nudging a customer. And a domain starts to slide — rotation keeps feeding it because rotation does not look at health. Each of those is a rule in Keep Your Chain, not a setting.
The tools that let you send the most are also the tools that let you make the most mistakes per day.
How to choose
Count your mailboxes. If the honest answer is "one or two per person, on domains I registered for my own product," and your list is a few thousand well-chosen companies rather than a few hundred thousand contacts, you are our customer. If the answer is "as many as it takes," you are theirs, and you should go get a good warmup pool.
Is Keep Your Chain a replacement for Instantly or Smartlead?
Only if you send under a few hundred a day from your own mailboxes and sell your own product. For outbound at scale or for many clients, the volume tools are the right category.
Does Keep Your Chain include a warmup network?
No. It enforces a per-mailbox ramp and works alongside a partner you choose. The volume tools bundle their own pools.
Which has the best deliverability?
None of them can promise it. It comes from your domains, list, volume and copy. Tools differ in how many bad decisions they let you make.
Keep Your Chain is on a waitlist while we run it on our own outreach. Plans start at $29 a month.
Join the waitlist