Comparison
Instantly vs. Furnace
About the same price. The difference is who runs the sending.
Buy from Instantly what Furnace includes and you pay about $305 a month at 12,000 emails, plus an estimated $15–40 replacing mailboxes that burn out, and 4–8 hours a month of your time. Furnace is $297 with replacements and upkeep included.
Updated
Monthly cost at 12,000 emails
- $97 Hypergrowth plan
- $150 30 mailboxes
- $47 placement testing
- $13 10 domains
- $15–40 replacing burned mailboxes (estimate)
Plus your time: about 4–8 hours a month (about $200–400 at $50 an hour), and 5–10 hours to set up.
Growth plan with 30 mailboxes, their domains, warmup, monitoring, and burned mailboxes replaced at no cost
Your time on the sending: none. We set it up and run it.
Buying from Instantly what Furnace Growth includes: 30 done-for-you Google accounts at $5 a month (20 sending, 10 backups), 10 domains at $15 a year, and the $47 placement testing add-on. Burned mailboxes assume 2 to 5% of them burn each month (Furnace's estimate), each replaced with a pre-warmed account ($10 a month, sold in fives) on a new $15 domain. Time is Furnace's estimate: 4–8 hours a month at $50 an hour, plus 5–10 hours to set up. From Instantly's pricing page and help center, October 2026, on monthly billing.
Side by side
Who does the work?
| Job | Instantly | Furnace |
|---|---|---|
| Domains and mailboxes | You buy 30, about $163 a month | Included: 20 sending, 10 backups |
| Time before you can send | About two weeks of warmup | Day one, on pre-warmed mailboxes |
| Deliverability checks | Placement tests, $47 a month | We catch domains going bad |
| Burned mailboxes | Pre-warmed replacements, about $15–40 a month | Replaced at no cost |
| Strategy calls | A custom-priced VIP service | Unlimited, with both founders |
| Your time on the sending | About 4–8 hours a month, plus 5–10 hours to set up | None. We run it |
| Who to email, what to say | You | You, with our help |
To be fair
When is Instantly the better pick?
When you'd rather run it yourself
If you already own warmed mailboxes, or you like running the sending yourself, you only pay for the plan: $97 a month at this volume.
When you want leads and a CRM in one app
Instantly sells a lead database and a CRM inside the same app you send from. Furnace sources leads as an add-on on Growth and up, and syncs to your CRM through OutboundSync.
Real people
Two founders on your account.
When something needs a person, you get one of us.
Kyle Nelson
Cofounder
Watches your account and takes strategy calls as often as you want them.
Porter Gardiner
Cofounder
Built the platform and answers support directly, with no limit.
Switching
How do I switch from Instantly?
- 1
Tell us you're moving from Instantly.
- 2
We do the whole migration for you, campaigns and leads included.
- 3
Start sending on pre-warmed mailboxes while your own warm up.
Questions
Do I need to buy my own mailboxes with Instantly?
Yes. Instantly plans cover the software. You connect mailboxes you already have or buy them from Instantly: $5 a month for a done-for-you Google account, $10 for a pre-warmed one, and $15 a year per domain. Furnace includes sending domains, mailboxes, and backups in every plan.
How long until I can send?
Instantly recommends warming new accounts for at least two weeks unless you pay for pre-warmed ones. On Furnace you start on pre-warmed mailboxes right away, while your own dedicated mailboxes warm up in the background.
What happens when a mailbox burns out?
On Instantly you replace it yourself, and its terms don't cover suspended accounts, including ones bought from Instantly. If 2 to 5% of 30 mailboxes burn each month, pre-warmed replacements on new domains run about $15–40 a month. On Furnace we catch domains going bad and replace their mailboxes at no extra cost.
Is Furnace more expensive than Instantly?
Not once you count what's included. At 12,000 emails a month, Instantly's $97 Hypergrowth plan plus 30 mailboxes, their domains, and placement testing comes to about $305 a month, plus an estimated $15–40 replacing burned mailboxes, and 4–8 hours a month of your time (about $200–400 at $50 an hour). Furnace Growth is $297 with all of that included, and we do the setup, warmup, monitoring, and replacements. Instantly is cheaper if you already have warmed mailboxes and skip placement testing.
Can I move from Instantly to Furnace?
Yes, and we do it for you. Tell us you're switching and we handle the whole migration from Instantly, campaigns and leads included. There's nothing to move on the sending side either: we set up the domains and mailboxes.
Ready to stop managing mailboxes?
Tell us who you want to reach. We'll set up the sending and show you around.
Book a callAlso see Smartlead vs. Furnace · HubSpot Email vs. Furnace · How Furnace works · Pricing