An Instantly alternative that writes the email too
Instantly is a cold email sending platform with mailbox warmup and deliverability tooling. Their site
Instantly is the better product if you know who you are writing to and need to reach a lot of them reliably. Kamu is the better product if the hard part is deciding who to write to and what to say. On raw sending volume per euro the comparison is not close, and it is not close in Instantly's favour.
Instantly is sending infrastructure, and good sending infrastructure is a real thing to buy. Unlimited mailboxes, warmup running continuously across them, deliverability tooling, and on the upper plans dedicated IP blocks. If your problem is that you have ten thousand addresses and need the mail to actually arrive, this is the shape of product that solves it.
It assumes you bring the campaign. Someone has to decide the segment, write the sequence, and judge whether the reply is worth following. Instantly has added AI features on top of that, but the centre of the product is still a platform an operator runs.
Kamu is not sending infrastructure and does badly if judged as though it were. It sends between ten and two hundred emails a day depending on plan, one at a time, each written against something that specific person actually posted or shipped. The pacing is deliberate rather than a limitation of the plumbing: the whole premise is a small number of messages a person might reasonably answer.
So the two are answering different questions. Instantly asks how to reach many people reliably. Kamu asks who is worth writing to this week and what to say to them, and then does it without anybody opening anything.
Side by side
| Kamu | Instantly | |
|---|---|---|
| What it costs | €25 a month on Seed, €49 Starter, €149 Growth, €349 Scale. | Growth $47, Hypergrowth $97, Lightspeed $358 for outreach; bundles from $94 to $555. |
| Sending volume | 10 to 200 emails a day by plan, so roughly 300 to 6,000 a month. Instantly wins this outright. | 5,000 a month on Growth, 125,000 on Hypergrowth, 500,000 on Lightspeed. |
| Who decides the target | Kamu does. It reads your product, works out who buys it, and finds those people. | You do. The platform sends the list you bring or build. |
| Who writes the message | Kamu, one at a time, opening on something that person actually said or shipped. | You write the sequence; the platform personalises it from your columns. |
| Mailboxes and warmup | One sending domain, warmed by Kamu. There is no mailbox fleet to manage. | Unlimited mailboxes and unlimited warmup on every outreach plan. This is the core of it. |
| What else it does | SEO articles, social posts, a landing page, directory listings and Meta ads. | Email, and lately AI agents around it. It is not trying to be the rest. |
When Instantly is the better choice
Take Instantly when volume is the point. If you have a defined audience, a list already built or bought, and a need to reach thousands of them a month, Kamu is the wrong tool and the pricing makes that obvious: five thousand sends is a month of Instantly's cheapest plan and more than Kamu does at any tier. Instantly also wins decisively on deliverability engineering. A fleet of warmed mailboxes across many domains is a genuinely different discipline from one warmed sending domain, and at scale it is the difference between arriving and not. If somebody on your side owns outbound and is good at it, giving them infrastructure beats giving them an agent.
Questions
Why does Kamu send so few emails?
Because it writes each one against something specific about that person, and that is the only reason a stranger replies. The cap is a design decision rather than a plumbing limit: a small number of messages somebody might answer is the premise, and thousands of them is a different business with a different deliverability problem.
Could I use both?
Yes, and it is a coherent split if you have the volume to justify it. Instantly runs the campaigns somebody on your side designs; Kamu handles the long tail, the content and the channels nobody has time for. They do not conflict, because they are not sending to the same list for the same reason.
Does Kamu do mailbox warmup?
It warms its own sending domain and enforces the caps, suppression and bounce handling in code rather than asking a model to remember them. What it does not do is run a fleet of mailboxes across many domains, which is the thing Instantly is built for and the reason it can send at the volumes it does.
Which is cheaper?
Kamu, per month, at every tier. Instantly, per email sent, by a very large margin. Which of those matters depends entirely on whether your problem is volume or deciding what to send.
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Other comparisons
Claims about Instantly were checked on . Pricing and features move, and some vendors do not publish prices at all. Check their own site before deciding. Sources: Instantly pricing, Kamu pricing.