Booost vs lemlist: a bought database of strangers, or the network you already have.

The short answer

lemlist is a multichannel outreach platform built around email: a 650-million-contact database, an email finder, a deliverability hub, a unified inbox — with LinkedIn, SMS, WhatsApp and calling layered on top. LinkedIn automation sits in the Multichannel plan, $109 per user per month, $87 billed annually.

Booost does LinkedIn and nothing else: outreach, content, publishing and engagement, on a machine you own, on top of an intelligence layer that maps your own network. €99 per managed account per month for Business, €79 on Basic; €19–29 for Personal.

The honest split: if you send cold email at volume, lemlist is the better product for that job. If LinkedIn is where your business actually happens, the two are not comparable in the way the price suggests — and the reason is in the next section.

What Booost does that lemlist does not

It maps the network you already have, instead of selling you strangers. lemlist's headline asset is a database of 650 million contacts — people you do not know, enriched and imported. Booost goes the other way: it builds a graph of your first- and second-degree connections and scores every contact on six axes — thematic fit, seniority, activity, target fit, influence and proximity — each with the evidence behind it. The Strategy tab tracks an affinity score (0–100) for the people you want in your network: it rises with real interactions and cools with silence, and the app can suggest a warm path through a mutual connection and draft the note. All of it is scored against the goals and target audience you set in a two-minute interview, so the question it answers is "who around me is worth my time, given what I am trying to do" — not "who else can I email". Nobody in this comparison does that.

It publishes. Booost drafts posts from your own sources, publishes them under your name or as a Company Page, then reacts, comments and reposts around them, in the same workflow as the outreach. lemlist automates LinkedIn profile visits, follows, invitations and text and voice messages — outreach actions. So do Expandi, Waalaxy, HeyReach and Dripify: not one of the five publishes content on LinkedIn. Outbound and presence are the same job, and Booost is the only tool here that treats them that way.

The AI is included flat, and it writes posts. lemlist ships AI too — this is not a case of one product having it and the other not. The difference is what it is attached to and how it is billed: lemlist meters credits, at $10 per 1,000 enrichment credits and from 20 credits per intent signal, and its AI serves email and outreach copy. On Booost Pro, model access is part of the subscription — no key to configure, no credit bundles, no tokens to top up mid-month — and because Booost publishes, its AI writes posts, comments and replies in your voice, in any language.

Your session never leaves your machine. Booost is a desktop application: it signs into LinkedIn from a browser on your computer, on your connection, and your password never reaches us. lemlist's LinkedIn features run through Google Chrome and the lemlist extension, linking your live browser session. We are precise about our own wording, though: "the session stays local" and "the data stays local" are two different promises, and only the first one is ours — your connection graph does travel to our servers, because that is where the intelligence above is computed, and our own documentation says so rather than glossing over it.

Built in the EU, GDPR by default, and the desktop app is audited WCAG 2.2 AA.

And Booost Personal is a different product entirely — a browser extension with its own dashboard, for people who want to be present on LinkedIn rather than run campaigns. It reads a post, drafts a comment in your voice in any language, and you publish it. It automates nothing, which is the one compliance claim nobody else in this category can make. €19–29 per account per month, and lemlist does not compete for that job at all.

Where lemlist is stronger

1. Email, properly. A deliverability hub, warm-up, a 650M contact database and an email finder are a category of work Booost does not do at all. If email is your main channel, nothing on this page should move you.
2. More channels. SMS, WhatsApp and in-app calling alongside email and LinkedIn. Booost is one network by choice, but that is still less surface.
3. A cheaper entry for teams — if you can live without LinkedIn. The Email plan is $55 a month billed annually and covers unlimited users. That is remarkable value for an email team, and Booost has no equivalent shape.
4. Developer surface. API, CLI and an MCP server, plus SSO/SAML on Enterprise. Booost has none of that today.
5. Maturity. Years in production against a product that opens on 1 September 2026.

Prices, as each company lists them

Read the right-hand column first. Note also the shape: lemlist's email plan covers unlimited users for one price, while the plan that includes LinkedIn is billed per user.

Enrichment and intent signals are add-on credits at lemlist — $10 per 1,000, and from 20 credits per signal. Booost has no credit system: the managed AI is part of the Pro subscription and there is no invitation quota on either edition.

Currencies are left as each company publishes them. Booost's founding price gives the Pro edition at the Basic price — €79 per account — locked for as long as the subscription stays active.

The claim nobody in this category can make — except one

Section 8.2 of LinkedIn's User Agreement prohibits third-party software that automates activity on LinkedIn regardless of where the software runs, and names browser extensions explicitly. That covers lemlist's LinkedIn features and it covers Booost Business — our Acceptable Use Policy says so in writing rather than in small print.

lemlist writes that its pacing keeps you "well within LinkedIn's rules". We are not going to turn that sentence against them, because the same caution applies to us: it is a statement about behaving moderately, not about permission, and nobody in this category has permission. Nor has anyone published comparative restriction rates.

The exception is Booost Personal, and it is the only clean compliance claim here: it performs no action on LinkedIn at all. It drafts, a human publishes. No cloud platform can say that, and no other browser extension can either, because both of them act.

One thing we will not claim about lemlist

To connect LinkedIn to lemlist you use Google Chrome and the lemlist extension, and what gets linked is your live browser session. What lemlist's public documentation does not state is where the LinkedIn actions are then executed — in your browser, or on lemlist's servers. The help-centre articles that would settle it are not readable without an account.

So we are not going to tell you. Everywhere else on this site a claim about someone else's product cites a public, dated source, and here we do not have one. If it matters to your decision, ask lemlist directly.

How to choose

Count your channels. If the answer is more than one and email is among them, lemlist is a better multichannel platform than Booost will be for a long time, and Booost never tried to be one.

If the answer is "LinkedIn, and it matters more than the rest", then the comparison is not really about price. It is whether you want a bigger list of strangers, or a clearer map of the people already one step away from you — and whether the tool should build your presence as well as your pipeline.

Booost opens on 1 September 2026. Join the waitlist to keep the founding price.

Sources

Checked 12 August 2026.

• lemlist pricing, including add-on credit rates, and LinkedIn prospecting
• lemlist help centre — use the lemlist Chrome extension
• LinkedIn User Agreement — section 8.2
• LinkedIn: prohibited software and extensions
• Booost prices, editions and what leaves the machine: our own terms, EULA and pricing