I get this question from founders running their first real outbound campaign, and honestly Instantly vs Lemlist comes down less to features and more to how much of the sending infrastructure you want the tool to handle for you.
Instantly is built around managing a lot of inboxes at once, with higher plans letting you connect an effectively unlimited number of sending accounts and rotate volume across them automatically. It leans into a built-in warmup network as its core selling point, the idea being you plug in domains and let the tool spread the reputation-building work across them.
Lemlist takes a different angle, leaning into personalization at the individual level, dynamic images and screenshots inserted per recipient, video, and sequences that combine LinkedIn steps with email rather than staying email-only. If Instantly is optimized for volume, Lemlist is optimized for making each message feel handwritten even inside a sequence.
Lemlist's personalization tools go further than most cold email software, letting you drop a custom image or screenshot into each email using liquid-style variables, which genuinely does lift reply rates when it's used well rather than as a gimmick. Its multichannel sequences that weave in LinkedIn connection requests and messages alongside email steps are also a real differentiator if outbound for you means more than inbox alone.
Instantly supports personalization too, custom fields and spintax to vary phrasing, but its product decisions clearly prioritize scaling volume across many mailboxes over building elaborate per-recipient media.
Both platforms ship with warmup features, Instantly's warmup network and Lemlist's lemwarm, and both will show you basic deliverability checks inside the dashboard. Those tools help, but they don't replace the fundamentals, your domain's underlying reputation, correct SPF, DKIM, and DMARC records, and a list that isn't full of dead addresses still decide more than any in-app warmup feature, see SPF, DKIM, and DMARC setup and best email warmup tools for what actually moves the needle.
I'd treat the built-in warmup on either tool as a helpful default rather than a complete deliverability strategy on its own.
Instantly has historically priced favorably for teams running many mailboxes at once, since higher plans include a large or unlimited number of connected accounts for a flat monthly rate. Lemlist bundles its multichannel and personalization features into its pricing, which tends to land higher per user once you want the full feature set rather than basic email sequencing.
Roughly, if your outbound motion is one person managing dozens of inboxes, Instantly's pricing model works in your favor. If it's a smaller number of reps sending highly personalized, multichannel sequences, Lemlist's per-seat cost is easier to justify.
Neither wins outright, they're built for different outbound motions. Agencies and teams managing high mailbox counts and volume-driven campaigns tend to prefer Instantly. Individual founders or SDRs running smaller, more targeted lists who want LinkedIn woven into the sequence tend to prefer Lemlist.
What I'd steer you away from is picking either tool expecting it to fix a deliverability problem you already have. Both work well once your sending fundamentals are solid, and both will underperform if they're not.
Neither guarantees better inbox placement on its own. Both include warmup features, but your domain reputation, authentication records, and list quality decide more than which tool you're using.
Technically yes, but most teams pick one since they overlap heavily on sequencing and warmup, and running both adds cost without much added benefit.
Lemlist leans further into multichannel sequences that combine LinkedIn steps with email. Instantly is more focused on email volume across many mailboxes.
Roughly, yes, at higher mailbox counts, since Instantly's plans include more connected accounts for a flat rate. Pricing changes fairly often on both, so check current plans before deciding.
I've seen teams run beautiful Lemlist sequences or scale Instantly to fifty inboxes and still land in spam because the underlying domain reputation was never fixed. Before you scale outreach on either platform, run a free Inbox Scorecard at Unbury to see where you actually stand.