Instantly vs TrulyInbox: Cross-Category Comparison

TrulyInbox is an email warmup tool: it connects to your mailboxes and exchanges warmup emails with a network of real accounts to build sender reputation, and it charges for the warmup emails it sends each day rather than for the inboxes you connect. Instantly is a cold email platform that sends the campaigns, and its pricing page lists unlimited email accounts and unlimited email warmup on every plan. So Instantly vs TrulyInbox is not a choice between substitutes. It is whether bundled warming is enough, or a separate network is worth adding.

What Is TrulyInbox?

TrulyInbox is a standalone warmup service, and nothing else: it does not send campaigns. You connect a mailbox (one click for Google and Microsoft, SMTP for everything else, in its own words), choose a warmup strategy, and its network sends to and replies from that mailbox every day so that mailbox providers see ordinary two-way correspondence. Its homepage describes that network as 40,000+ real accounts, roughly 21,000 on Google, 9,000 on Microsoft, 760 on Zoho and 10,000 elsewhere. Those are the vendor's own figures.

What it reports back is a deliverability score from 0 to 100, a 90-day history, a breakdown by mailbox provider and an outreach readiness indicator that says when a mailbox is ready to send.

TrulyInbox Pricing, Plan By Plan

TrulyInbox's pricing page (in US dollars, with a currency switcher) lists five plans. Every paid plan connects unlimited email accounts; what rises is the daily warmup volume and the reply rate the network gives your warmup emails.

Plan	Month / year	Warmup a day	Suits
Free	$0	10	1 account
Starter	$29 / $22	200	3 inboxes
Growth	$99 / $84	1,000	15 inboxes
Scale	$199 / $169	3,000	50 inboxes
Scale Plus	from $479 / $407	5,000 to 20,000	100 inboxes

The page puts the reply rate at up to 25 percent on Starter, 45 on Growth, 60 on Scale and 65 on Scale Plus; it defines reply rate as the share of your warmup emails that get a reply. Growth adds all four warmup strategies (AI Adaptive, Progressive, Random and Flat), Scale adds an onboarding call and a dedicated account manager, and paid plans come with a 7-day free trial and a 14-day money-back guarantee. Plan changes take effect immediately and are prorated, so a fleet that grows mid-month can move up a tier without waiting for renewal.

Source: TrulyInbox Pricing

Instantly Pricing, And What It Bundles

Instantly meters sends and uploaded contacts. Its pricing page lists Growth at $47 a month for 5,000 emails and 1,000 uploaded contacts, Hypergrowth at $97 for 125,000 emails and 25,000 contacts, and Light Speed at $358 for 500,000 emails and 100,000 contacts, with Enterprise quoted. Every plan card lists unlimited email accounts and unlimited email warmup, Light Speed adds what the page calls its SISR system, and Enterprise adds a private deliverability network.

Instantly's lead database is a separate purchase: its machine-readable pricing page says credits, which power SuperSearch lookups across 450M+ B2B contacts and its AI agents, are a subscription separate from Outreach, sold on their own or in bundles. For this comparison that matters only as a reminder that the $47 covers sending and warming, not the list.

On yearly billing the same cards read $37.60, $77.60 and $286.30 a month, and the yearly Hypergrowth card lists 100,000 emails a month rather than the 125,000 on the monthly one. Read the volume beside the price rather than assuming the annual term is the same plan cheaper.

Source: Instantly Pricing

Does Instantly Already Include Warmup?

Yes. Instantly lists unlimited email warmup on every plan card, alongside unlimited email accounts, so a team on Instantly is never without warming. The question on this pairing is therefore not whether you have warmup. It is whether warming on the same platform that sends your campaigns is the arrangement you want, or whether an independent network is worth a second line.

A second network earns its place in two cases: mailboxes that are new and have no history, and established mailboxes whose placement has slipped while the campaign itself has not changed. In both, a separate network gives you a comparison point that does not come from the tool doing the sending.

What A Two-Tool Stack Costs

The fleet sizes below are invented for the example; the prices and sizing rules are the vendors' own. The illustration assumes 30 cold emails per mailbox per day, which is near TrulyInbox's own sizing guidance, and 22 sending days a month.

Inboxes	Instantly	TrulyInbox
3	Growth $47 1,980 sends a month	Starter $29 180 warmup a day
10	Hypergrowth $97 6,600 sends a month	Growth $99 600 warmup a day
25	Hypergrowth $97 16,500 sends a month	Scale $199 1,500 warmup a day
50	Hypergrowth $97 33,000 sends a month	Scale $199 3,000 warmup a day

Two things follow. First, neither bill moves with the number of mailboxes as such; both move with volume, so the fleet can be split as finely as deliverability needs without a per-inbox charge on either side. Second, the warming line grows faster than the sending line: at ten mailboxes the two are about the same size, and from twenty-five mailboxes a separate network costs about twice the sending platform. That is the number to hold against the result the second network is expected to produce.

How To Tell The Warming Worked

Reply rate is the honest measure and it is the slowest one to arrive. Bounce composition moves sooner and says more: a rising share of soft bounces and policy rejections concentrated on one mailbox provider points at reputation, while a rising share of unknown-user bounces points at the list instead. Those are different problems and only the first one is what a warmup tool is for.

TrulyInbox's deliverability score and readiness indicator are the vendor's own answer to the same question, and they are worth reading beside the campaign's numbers rather than instead of them. A vendor dashboard reports its own activity, so a score that improves while replies do not has told you the tool ran rather than that placement changed.

What Warming Will Not Fix

Warming raises the odds that a message is seen. It does nothing about whether the message deserved to be. A warmed mailbox sending a badly targeted list gets the same silence as a cold one, and the engagement the warming was protecting falls anyway once real recipients start ignoring real emails at volume.

Three things sit upstream of both tools and neither vendor sells them. The list has to be right, because relevance is what produces the replies that hold a reputation up. The offer has to be worth answering. And the send pattern has to stay ordinary: one message per campaign, no thread replies, no bump sequences, and a day's volume spread across mailboxes rather than concentrated in one.

When To Start With Which

Instantly first, if there is no way to send campaigns yet: its pricing page starts at $47 a month with unlimited email accounts and warmup included, which covers both jobs at once. TrulyInbox first, or alongside, when the sending is in place and the gap is reputation: new mailboxes with no history, or established ones whose replies have fallen away while nothing in the campaign changed.

Using Both Together

Point both at the same mailboxes only deliberately, and treat TrulyInbox as the control rather than the replacement. Instantly's warming runs on the accounts it sends from; TrulyInbox warms through its own network, so a mailbox connected to both receives warmup traffic from two pools, and the two volumes add up. Keep the combined warmup inside the ratio you would use for one tool.

Start with one mailbox on TrulyInbox's free plan (one account, 10 warmup emails a day) beside the rest of the fleet on Instantly's warming alone, and read the same campaign's numbers after a few weeks. Ramping the daily warmup volume the moment you connect is the usual way that test gets spoiled, because a sudden jump in engagement is itself a pattern change.

The two house rules most often broken by a new stack are the send pattern ones. One message per campaign means a prospect who does not reply is re-approached in a fresh campaign with a fresh angle rather than chased down the same thread. Spreading a day's volume across mailboxes does the same thing for the fleet, and both tools leave you free to do it, because neither charges per mailbox.

Decision Shortcut

If the campaigns are landing and replies are steady, Instantly's bundled warming is enough, and TrulyInbox's free plan on one mailbox is worth connecting purely as a reference point. If replies have fallen away across the fleet, put the affected mailboxes on a separate network sized by daily warmup volume and give it a few weeks before judging. If you are buying from nothing, buy the sending platform first.

Teams at this point are usually partway through a bigger stack decision, and the wider field of outreach platform alternatives is the part of it that decides how the sending gets done.

Related Reading

• Best Instantly Alternatives in 2026
• Best TrulyInbox Alternatives in 2026
• Instantly vs Smartlead
• Instantly vs Lemlist
• Mailreach vs TrulyInbox

If you would rather have this run for you, RevenueFlow books qualified meetings on a pay-per-meeting basis, against criteria agreed in writing before launch, and publishes client results.

Pricing and features are taken from the vendors' own pages. Verify current terms with the vendor before relying on them.