
Apollo.io
lemlist
SmartLead.ai
Reply.io
Mailshake
Hunter.io
ZoomInfo
Build your own infinitely scalable cold email outreach system with Instantly.
LayerStack’s Arm-based cloud virtual machines, powered by cloud-optimized CPU based on Arm architecture that deliver excellent cost-effective processing power, allowing you to easily complete the most demanding application development.

Which is more popular?
Based on our record, Instantly.ai seems to be more popular. It has been mentioned 21 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | instantly.ai | layerstack.com |
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| Company | Startup from the United States | — |
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Instantly Review - Creating A B2B Email Campaign With Instantly
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External articles and on-site reviews we used to compare the two products.

Apollo now ships email warmup and inbox rotation too, so the difference comes down to volume economics. Instantly charges by emails sent and lets you connect unlimited inboxes, while Apollo charges by seat and credit.
What is the best MCP server for sales teams in 2026? toflow.ai is the most complete MCP server for sales in 2026, covering ICP search, account research, enrichment, sequence enrollment, and outreach across email,...
Instantly is stronger if email is your primary acquisition channel and you need deliverability infrastructure like inbox rotation, warm-up systems, and high-volume sending controls to scale cold email campaigns.
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Recommendations tracked on public social media and blogs since March 2021.

I rebuilt my outreach this week after my reply rate tanked from 4% to <1%. Pulled fresh data from 5+ deliverability blogs (Autobound, MarketingProfs, HyperGen, Instantly), built a Python validator to enforce the new rules across 70+... - Source: dev.to / 6 months ago
Instantly was my final selection given its API was the most robust and well documented. It gave claude full access to campaigns, leads, and sequences while also being capable of sending webhooks on reply and unsubscribe events. - Source: dev.to / 10 months ago
Anywho, the old mailgun system was able to send emails immediately + had images in them. The recommendations we got were to remove ALL images, and instantly.ai has to delay a few minutes between email. So the emails get out slower and no... Source: about 3 years ago
Tracking LayerStack Arm-based Cloud Server since Jun 2024.
When comparing Instantly.ai and LayerStack Arm-based Cloud Server, you can also consider the following products.

Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.
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The prospecting tool to automate multichannel outreach & actually get replies.
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Email Automation Platform
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Reply.io is an AI-driven sales engagement platform that automates cold outreach through unlimited mailboxes, converts website traffic into booked meetings with AI Chat, and empowers your team to streamline the entire sales process with AI SDRs.
Compare Reply.io to Instantly.ai or LayerStack Arm-based Cloud Server:

Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.
Compare Mailshake to Instantly.ai or LayerStack Arm-based Cloud Server:

Find all the email addresses related to a domain
Compare Hunter.io to Instantly.ai or LayerStack Arm-based Cloud Server: