Aerosend vs Smartlead vs Instantly

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Key Takeaways

  • Aerosend is an inbox provider. Smartlead and Instantly are sequencers
  • Cold email success needs both inboxes and sequencers working together.
  • Aerosend provides inboxes, domains, warm-up, technical setup, and reputation protection.
  • Smartlead and Instantly automate sending, scheduling, and personalization.
  • Aerosend builds the infrastructure; Smartlead/Instantly run campaigns on it.

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To send cold emails that will land in the inbox, you need two things:

 

  1. Inboxes – Email accounts your cold emails are sent from.
  2. Automation Software – This software helps you manage multiple inboxes and automate sending, so you don’t have to do it manually.

 

Together, they help you send cold emails that book meetings.

 

The Difference

 

Aerosend gives you high deliverability inboxes. It handles inbox creation, warm-up, and domain reputation so your emails are ready to go and land in inboxes.

 

Smartlead and Instantly don’t create inboxes. They take the inboxes you already have and automate the sending, scheduling, follow-ups, and personalization.

 

That brings us to the key difference between these platforms. Aerosend focuses on the behind-the-scenes infrastructure. It includes inboxes, IPs, Warmup, and servers. Smartlead and Instantly, on the other hand, focus on automating sends, personalization, segmentation, etc.

 

Understanding this split is the first step to building a cold email system that actually scales.

 

How does Aerosend work with Smartlead and Instantly?

 

Aerosend inboxes connect directly to any sequencer (Smartlead or Instantly). You just have to buy domains; we set it up, connect it to your sequencer of choice. Smartlead deals with domain rotations, tags, sending times, etc. Two work together for optimal deliverability.

 

Here’s how they compare:

 

Tool Core Role Best For Why It Matters in Cold Email
Aerosend Private infrastructure (DNS, inboxes, deliverability) All teams who want to send cold emails that land in the inbox. Creates inboxes that are used for domain rotation so teams can continue booking meetings.
Smartlead Sequencer and automation platform Agencies wanting advanced multi-step sequences, personalization, and AI-driven follow-ups Automates sending and replies at scale, using Aerosend’s infrastructure for better deliverability
Instantly Sequencer with a simpler UI and fast setup Solo operators or small teams that need quick campaign launches with basic automation Offers an easy-to-use sequencer that integrates with Aerosend’s inboxes for instant sending power

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How to Get Your Instantly API Key

Step 1 : Log in to Your Instantly Account

Go to https://app.instantly.ai/auth/login and log in to your account

Step 2 : Navigate to Settings

Click on your profile icon in the bottom-left corner, then select “Settings” from the dropdown menu.

Step 3 : Select Integration

In the Integrations page, click on the “API Keys” tab in the left sidebar.

Step 4 : Get Your API Key with all:read Scope

If you already have an API key with the all:read scope, you can use that key.


If not, click the “Create API Key” button, select the all:read scope, and make sure to save your new API key somewhere safe.

How to Get Your Smart Lead API Key

Step 1 : Log in to Your Smart Lead Account

Go to https://app.smartlead.ai/login account and log in to your account

Step 2 : Navigate to Settings

Click on the “Settings” option in the top right corner profile icon.

Step 3 : Select API Integration

In the Settings page, under your profile picture, you can see the SmartLead API Key.

Step 4 : Generate Your API Key

If you already have an API key displayed, you can use that key. If not, click the “Generate API Key” button to create a new one.