
Apollo.io
lemlist
SmartLead.ai
Reply.io
Mailshake
ZoomInfo
Hunter.io
Build your own infinitely scalable cold email outreach system with Instantly.

MailChimp
Campaign Monitor
Constant Contact
Mailjet
Zoho Campaigns
Litmus
Elastic Email
Sendloop helps you to get more subscribers to your mail list and send emails on the fly. Sign-up free and enjoy the easy-to-use email delivery service

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 | sendloop.com |
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| Company | Startup from the United States | — |
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What each product offers, as listed by its team.


Possible disadvantages
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An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Instantly Review - Creating A B2B Email Campaign With Instantly
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Sendloop - How it works?
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How often each product is chosen within a category, 0–100% relative to the other.


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External articles and on-site reviews we used to compare the two products.


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.ai is a dynamic AI-powered engagement platform that automates interactions with website visitors in real time through intelligent chatbots. It specializes in qualifying leads, answering inquiries, and...
Instantly.AI focuses on cold email outreach with features that allow businesses to scale their email campaigns efficiently. It helps to increase deliverability, automate follow-ups, and manage outreach campaigns at...
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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 / 5 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 / 9 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 SendLoop since Mar 2021.
When comparing Instantly.ai and SendLoop, 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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MailChimp is the best way to design, send, and share email newsletters.
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The prospecting tool to automate multichannel outreach & actually get replies.
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Email marketing software built for designers and their clients to run successful email campaigns.
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Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Compare Constant Contact to Instantly.ai or SendLoop: