Instantly vs Mailshake: Which Cold Email Platform Fits You?

Instantly and Mailshake both help sales teams and agencies run cold email campaigns, and they approach the problem differently. Instantly focuses on high-volume email outreach, with a lead database sold alongside it. Mailshake, whose own site at mailshake.com calls it sales engagement software, pairs email with a power phone dialer on its top plan.

This guide breaks down the objective differences so you can choose based on your actual needs.

What mailshake.com sells, and what it costs

Mailshake, at mailshake.com, sells cold email and sales engagement software billed per user. Its pricing page loads on yearly billing: Starter at $25 a month, Email Outreach at $45 and Sales Engagement at $85, or $29, $49 and $99 billed monthly. Plans carry one, two or ten email addresses, and Sales Engagement adds a power dialer.

The Quick Answer

If you need to send high volumes of cold email from unlimited email accounts, and want a B2B lead database from the same vendor, Instantly is built for that use case. The platform emphasizes deliverability at scale.

If you want email and phone calls in one platform, Mailshake's Sales Engagement plan adds a power dialer with unlimited free minutes to North American numbers. The tradeoff is lower email volume limits on entry-level plans.

Understanding the Core Difference

Both platforms let you automate email sequences, run A/B tests, and track campaign performance. The similarities end there.

Instantly is built around email volume. Every Outreach plan includes unlimited email accounts and unlimited warmup, and the pricing page sells a database of 450M+ B2B leads on its separate Credits plans and bundles. The platform is designed for teams that want to scale outbound email as their primary channel.

Mailshake is built around multichannel sales engagement. Its Sales Engagement plan includes five phone numbers and a power dialer with unlimited free minutes to North American numbers. The platform is designed for sales teams that want email and phone in one workflow.

Teams weighing Mailshake against a broader sales engagement suite can see how it stacks up against Gong's outreach and call intelligence tools.

Pricing Comparison

Instantly Outreach pricing

Those are the monthly figures the page displays. Its own compare table still lists Hypergrowth at 100,000 emails a month, against 125,000 on the card. The served markup also carries a yearly set of cards at $37.6, $77.6 and $286.3 a month; the Yearly switch did not respond in a headless read, so those are the markup's figures rather than a state this article saw displayed. The page also sells bundles of outreach and data, from Starter at $94 a month.

Source: Instantly Pricing

Mailshake pricing

The page loads on yearly billing and bills per user. Sales Engagement adds five phone numbers, the power dialer with unlimited free minutes to North American numbers, phone scripts and 2,500 free data finder credits; an Agency plan with unlimited email addresses is sold through sales.

Source: mailshake.com/pricing

Pricing Analysis

The pricing models reflect different priorities:

For pure email volume: Instantly's Growth plan ($47) includes 5,000 emails a month from unlimited accounts, while Mailshake's Starter ($29 monthly) allows 1,500 sends from a single address. Mailshake's Email Outreach plan removes the send cap at $49 but connects two addresses.

For calling: Mailshake's Sales Engagement plan ($99 monthly, $85 yearly) includes a power dialer, which Instantly's Outreach plans do not list.

For email accounts: Instantly includes unlimited accounts on every Outreach plan. Mailshake's cards allow one, two or ten email addresses per account, while the FAQ on the same page ties mail accounts to paid users:

The plan cards

• Starter: 1 email address per account
• Email Outreach: 2 email addresses per account
• Sales Engagement: 10 email addresses per account
• Agency: unlimited email addresses, through sales

The FAQ on the same page

• "Billing is paid by your team and is based on how many users you purchase."
• "With each user you pay for, your team may connect 1 mail account."

Email Warmup

Instantly Warmup

Instantly includes unlimited email warmup on all plans. The system automatically sends and receives emails within their network to build sender reputation before you launch campaigns.

Mailshake Warmup

Mailshake's pricing page lists unlimited email warmup on every plan, from Starter up.

Warmup Comparison

Both platforms include warmup at no extra cost. Instantly emphasizes this more heavily in their marketing, but Mailshake covers the fundamentals. For most users, either platform handles warmup adequately.

Lead Database

This is a significant differentiator.

Instantly sells a database of 450M+ B2B leads on its Credits plans, from Growth Credits at $47 a month with 1,500 Instantly credits, 13 filters including keywords and lookalikes, and waterfall work email enrichment with 5+ providers.

Lead databases and enrichment go hand in hand, and teams comparing sourcing tools may also want to see how enrichment platforms stack up against each other.

Mailshake lists a Data Finder that searches for prospects by specific role, location or company. Every plan includes free finder credits, 50 on Starter and Email Outreach and 2,500 on Sales Engagement, and more are sold as an add-on at $19 a month, or $17 on yearly billing.

Data line	Instantly	Mailshake
What it is	Database of 450M+ B2B leads	Data Finder, search by role, location or company
How it is sold	Growth Credits, $47 a month, 1,500 credits	Add-on at $19 a month, $17 yearly
Included in plans	Not on the Outreach cards	50, 50 or 2,500 free finder credits

For teams sourcing their own leads, this difference may not matter. For teams that want prospecting and outreach from one vendor, both now sell a data line; they differ in how much of it the base plan includes.

Freshsales vs Monday CRM examines how those same prospecting workflows connect to CRM platforms once leads move beyond the outreach stage.

Multichannel Features

This is where Mailshake has an advantage.

Mailshake calling

• Power dialer: The Sales Engagement plan includes five phone numbers and unlimited free dialer minutes to North American phone numbers, with calls made from the browser.
• Phone scripts and tasks: The same plan lists phone scripts, lead temperature, an account-level view and custom tasks.
• LinkedIn: No LinkedIn automation is listed on Mailshake's pricing or features pages read for this article, so a LinkedIn step needs another tool.

Instantly multichannel

Instantly's Outreach plans list email only: no phone dialer or LinkedIn step appears on its pricing page. Teams needing those channels use separate tools alongside it.

Multichannel Comparison

If your sales process involves phone calls, Mailshake's included dialer provides real value: $99 a month, or $85 on yearly billing, buys email and North American calling on one seat.

If email is your only channel, Instantly's higher volume limits may be worth more than features you won't use.

Deliverability Features

Instantly deliverability

The Outreach plans list unlimited email accounts and warmup, advanced warmup capabilities, reputation protection and bounce detection, a global block list, A/Z testing and the Unibox for replies.

Mailshake deliverability

Every plan lists unlimited email warmup and unlimited email verification, A/B testing and AI email writing with SHAKESpeare; Email Outreach adds email rotation and advanced scheduling and throttling.

Deliverability Comparison

Both platforms include the core deliverability features. Instantly's unlimited email accounts allow more distribution (spreading volume across many inboxes), which can help deliverability at scale. Mailshake's email rotation does a smaller version of the same job across its addresses.

Integrations

Instantly's compare table lists API, webhooks and integrations. Mailshake's Email Outreach plan lists Salesforce, Pipedrive and HubSpot plus 1,000+ integrations via Zapier.

Once your outreach starts generating replies, you will need a CRM to manage them, and the CRM platform comparison for pipeline management can help you pick between Google Workspace automation and customizable pipeline boards.

Use Case Recommendations

Best Fit for Instantly

• High-volume email senders: Higher email limits and unlimited accounts support scale
• Teams wanting a large lead database from the same vendor: 450M+ leads on the Credits plans
• Email-focused outreach: If email is your primary (or only) channel
• Agencies managing multiple campaigns: Unlimited accounts simplify client management

Best Fit for Mailshake

• Sales teams making phone calls: Built-in dialer with unlimited free minutes to North American numbers
• Email plus phone: Email and a power dialer in one platform
• Reps who need a unified view: All touchpoints tracked in one timeline
• Teams on a tight budget: $29/month entry point for basic email outreach

Feature Comparison Summary

Getting Started Checklist

Whichever platform you choose:

Week 1-2: Setup

• Set up dedicated sending domains (never use your main domain)
• Connect your email accounts
• Enable warmup on all accounts
• Let warmup run 2+ weeks before launching campaigns

Week 2-3: First Campaign

• Import or source your first lead list (start with 200-500 leads)
• Write one message per campaign, with no follow-up bumps
• Configure sending schedule (spread throughout business hours)
• Set up reply notifications

Week 3+: Launch and Optimize

• Start at conservative sending volume
• Monitor open rates and reply rates
• Track bounces and spam complaints
• Adjust targeting and copy based on results

Final Thoughts

Instantly and Mailshake solve different problems:

Choose Instantly for: High-volume email, unlimited accounts, a large lead database sold alongside, email-first outreach

Choose Mailshake for: Email with a built-in phone dialer, per-user plans, bundled finder credits

The platform you choose matters less than the fundamentals. Targeting the right prospects with relevant messaging drives results. Pick the tool that fits your workflow, set it up properly, and focus on the strategy behind your outreach.

Related Reading

• Mailshake vs Reply.io: Which Cold Email Platform Fits Your Sales Process?
• Lemlist vs Mailshake: Which Cold Email Platform Fits Your Outreach Strategy?
• Smartlead vs Mailshake: Comparing Cold Email Platforms for Sales Teams

If you would rather have this run for you, RevenueFlow books qualified meetings on a pay-per-meeting basis and publishes client results.

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