Instantly vs Smartlead: which cold email tool fits your volume?

Once your sending domains are set up and warmed, you need a tool to run cold email at scale: one that sends sequences across several mailboxes, spaces the emails out, stops when someone replies and keeps warm-up running in the background. Instantly and Smartlead are the two names that come up most often.

They're more alike than different. Both connect unlimited mailboxes without charging per account, both include warm-up, both rotate sending across mailboxes and both collect replies in one inbox. What separates them is how each plan limits contacts and sends, which features sit on higher plans, and how well each suits an agency running campaigns for several clients.

Prices side by side

Published monthly prices, checked on October 7, 2026.

On annual billing, Instantly's plans work out to $37.60, $77.60 and $286.30 a month. Smartlead's work out to $32.50, $78.30, $144.50 and $314.60.

What you get on each

Instantly

Instantly sells its sending tool as Outreach plans.

• Growth, at $47 a month, includes unlimited email accounts, unlimited warm-up, 1,000 uploaded contacts and 5,000 emails a month, with chat support.
• Hypergrowth, at $97, raises that to 25,000 contacts and 125,000 emails, with premium live support.
• Light Speed, at $358, allows 100,000 contacts and 500,000 emails, and adds dedicated sending servers and IP blocks.

Instantly also sells credits for lead data and AI features as a separate plan, from $47 a month for 1,500 credits, so you can search for leads, verify them and email them without leaving the platform.

Best for: founders and small teams who want simple plans and a lot of room on the middle tier. Watch for: the 1,000-contact limit on Growth, which a single campaign to a well-researched list can reach.

Smartlead

Smartlead prices by contacts, sends and verified emails.

• Base, at $39 a month, includes 2,000 contacts, 6,000 email sends and 2,000 verified emails.
• Pro, at $94, includes 30,000 contacts, 90,000 sends and 30,000 verified emails, and adds CRM access, API and webhooks, and client workspaces as an option.
• Unlimited Smart, at $174, removes the contact limit and allows 150,000 sends.
• Unlimited Prime, at $379, allows 500,000 sends and includes three dedicated servers.

Every plan includes unlimited email accounts. Client workspaces with white-labeling cost $29 a month each, from the Pro plan up.

Best for: agencies, and founders who want the lowest entry price with a higher contact allowance. Watch for: API access and webhooks, which aren't on the Base plan, if you want to connect a CRM or your own tools.

Which is cheaper for your volume

Work out how many emails you'll send a month, including follow-ups, and how many contacts you'll upload.

A founder doing careful outbound. Three mailboxes, about 30 emails a day each, around 22 sending days a month, is roughly 2,000 emails a month to perhaps 600 to 800 new contacts. Both entry plans cover it: $39 on Smartlead or $47 on Instantly. Smartlead's higher contact allowance gives more headroom.

A small sales team. Ten mailboxes at the same pace send around 6,600 emails a month. That's past both entry plans' email limits, so the realistic choices are Instantly Hypergrowth at $97 or Smartlead Pro at $94, a near tie.

An agency running several clients. Volume can easily pass 100,000 emails a month. Instantly Hypergrowth allows 125,000 for $97. Smartlead Pro allows 90,000 for $94, and Unlimited Smart allows 150,000 for $174. Add Smartlead's $29 a month per client workspace if you want white-labeled separation.

The full monthly cost of a cold email setup

The tool is only one line of the budget. Take the founder above, with three mailboxes on one secondary domain:

• Mailboxes: three Google Workspace Business Starter accounts at $7 a user a month on an annual plan, $21 a month.
• The domain: a small yearly registration fee.
• The sending tool: $39 on Smartlead Base or $47 on Instantly Growth.
• Lead data: free tiers to start, or a paid data plan if you need more.

That's roughly $60 to $70 a month before data. The tool is the largest single line, but scaling up adds mailboxes and domains, and those grow with every sender you add.

Running a campaign in either tool

The workflow is much the same in both, and it's worth knowing before a trial so you can compare like for like.

• Connect mailboxes through Google or Microsoft sign-in, and turn on warm-up for each.
• Upload a list as a CSV, with columns for first name, company and any personalized first line you've written.
• Write the sequence: a first email and two or three follow-ups, with variables for personalization and a few days between steps.
• Set the schedule: sending days and hours in the recipient's time zone, and a daily limit per mailbox.
• Launch to a small batch first, check replies and bounces, then release the rest.

Deliverability features

Neither tool can make a bad list or a bad email land in the inbox. What they can do is give you the controls that protect your domains.

Both offer:

• unlimited mailboxes, so you can spread volume thinly across many accounts,
• warm-up, sending and replying to emails across a network of real mailboxes to build reputation,
• sending limits and spacing per mailbox, so you never send in bursts,
• stopping a sequence when the recipient replies, and
• a combined inbox for replies across all mailboxes.

Each also sells dedicated infrastructure on higher plans: Instantly's Light Speed plan includes dedicated servers and IP blocks, and Smartlead's Unlimited Prime includes three of its SmartServers, which can also be added to other plans. Most small senders don't need either. Good domain setup matters far more, as our guide to setting up a domain for cold email explains.

Lead data

Both companies sell more than a sending tool, which matters if you'd rather not pay for a separate data provider.

• Instantly sells lead data and AI features through credit plans, from $47 a month for 1,500 credits.
• Smartlead includes verified emails in each plan, from 2,000 a month on Base, and sells email verification as an add-on.

If you already use a dedicated data provider such as Apollo, you may not need either. Our comparison of Apollo, Lusha and Hunter covers those.

For agencies

Agencies running cold email for clients need to keep each client's mailboxes, campaigns and results separate, and often to show clients a branded dashboard.

Smartlead is built with this in mind. From the Pro plan, client workspaces cost $29 a month each and come with white-labeling, so each client sees its own campaigns and reporting under your brand.

If you're weighing Instantly for agency work, test during the trial how it separates clients and reports to them, since that's where agency workflows differ most.

Integrations and the API

If you want replies to flow into your CRM automatically, or to trigger campaigns from your own tools, you need an API or webhooks.

• Instantly lists API access, webhooks and integrations across its Outreach plans.
• Smartlead includes API access and webhooks from the Pro plan. The Base plan doesn't include them.

Check which CRMs each tool connects to natively before you choose. An automation tool can often fill the gap if the native integration you need is missing.

Staying within the rules

A cold email tool doesn't make your emails compliant. You still have to follow CAN-SPAM, which applies to business email too: accurate headers, honest subject lines, your postal address, a working opt-out and opt-outs honored within 10 business days. Both tools can add an unsubscribe link and suppress people who opt out. Make sure that's turned on for every campaign, and that opt-outs are shared across all your mailboxes and campaigns. Keep your spam complaint rate below the 0.3% that Google and Yahoo publish as their limit.

Questions to answer during the trial

Both tools let you start without a credit card. Use the trial to answer:

• How long does it take to connect and warm up your mailboxes?
• Does the contact limit on the plan you'd buy fit your first few campaigns?
• How easy is it to write a sequence with personalized first lines?
• Do replies arrive in one inbox, clearly matched to the right lead?
• Does it connect to your CRM the way you want?
• For agencies, how easily can you separate and report on each client?

Which one should you pick?

• Pick Smartlead if you want the cheapest entry plan, need more contacts at the low end, or run an agency that needs white-labeled client workspaces.
• Pick Instantly if you want simple plans with a high email allowance at the middle tier, unlimited warm-up listed on every plan, and lead data from the same company.

At the volumes most founders send, the difference in price is a few dollars a month. The setup of your domains, the quality of your list and the relevance of your emails will decide your results far more than the tool. Our guide to cold email for B2B startups covers those.