Software Alternatives, Accelerators & Startups

Warmy.io VS SendAPI

Compare Warmy.io VS SendAPI and see what are their differences

Warmy.io logo Warmy.io

We don't send emails. We get them seen.

SendAPI logo SendAPI

Send WhatsApp messages, SMS, OTP codes, and transactional email via one REST API. Official Meta Business Partner. 3-day free trial โ€” no credit card required.
  • Warmy.io
    Image date //
    2026-08-19
  • Warmy.io
    Image date //
    2026-08-19
  • Warmy.io
    Image date //
    2026-08-19
  • Warmy.io
    Image date //
    2026-08-19
  • Warmy.io
    Image date //
    2026-08-19
  • Warmy.io
    Image date //
    2026-08-19

Warmy.io is a cloud-based SaaS solution for email deliverability and email warmup services.

This AI-powered email warmup tool provides a full suite of tools to help businesses and marketers improve their email sender reputation, ensuring emails land in the inbox and not the spam folder.

Hereโ€™s how Warmy works:

The tool connects to your mailbox and utilizes an artificial intelligence engine called "Adeline" to warm up your mailbox at an optimal pace. Adeline analyzes hundreds of parameters daily, interacts with real people on your behalf, and ensures that your emails reach the inbox consistently.

Warmy gradually improves sender reputation by automatically opening, marking as important, and removing sent messages from the spam folder, sending signals to mailbox providers that you are to be trusted.

Warmy provides full progress monitoring, offering a clear and transparent process so users can stay informed and in control.

Warmy is compatible with major email providers and offers integration with popular apps and tools, allowing users to streamline their workflows and easily integrate Warmy into their existing cold outreach process.

Warmy also offers a full suite of free tools designed to optimize every step of the deliverability process. These include a free Email Template Checker which scans your content for anything that might set off spam filters, a free Email Deliverability Test to know where your emails are landing, a Cold Email Sequencer, and even free Record Generators for SPF and DMARC.

Overall, Warmy provides a user-friendly and automation-driven solution to optimize email deliverability and enhance email marketing campaigns.

  • SendAPI User Dashboard
    User Dashboard //
    2026-04-29

Warmy.io

Website
warmy.io
$ Details
freemium $49 / Monthly
Platforms
Web
Release Date
2021 January
Startup details
Country
Israel
City
Tel Aviv
Employees
100 - 249

Warmy.io features and specs

  • Raise your sender reputation
    Stay away from spam filters with great reputation of your mailbox and domain
  • Real mailboxes, real people
    Only real people, only real mailboxes, a huge variety of mailbox providers
  • Authentic behaviour
    Your mailbox will behave just like a real human being, with no trace of any software
  • Same thread conversations
    Full conversations in the same thread between different people to show perfect activity
  • 100% automation
    You just connect your mailbox, and that's all. We will do the rest for you.
  • Innovative AI algorithms
    Our innovative approach and algorithms are the key to great results
  • Keep high deliverability rates
    Land in the inbox of your prospect, avoid the spam folder, and grow!
  • Free Email deliverability test
    Test where your messages are landing in almost any email provider.
  • Email template checker
    Test your cold email template before sending it to your prospects
  • Free email signature generator
    Get a professional email signature that won't send your emails to spam
  • Free SPF Record Generator
    Increase domain security: Create the perfect SPF record now
  • Free DMARC Record Generator
    Create a secure DMARC record to safeguard your domain against spoofing and phishing threats
  • Free cold email sequence builder
    The more follow-ups in your cold email campaign, the more successful it is.
  • Email deliverability guide
    Implement these tips to make your email channel reliable!

SendAPI features and specs

  • Channels
    Whatsapp,SMS,Email
  • API Keys
    1 to Unlimited depending on plan
  • Free Trial
    3 days, no credit card required

Analysis of SendAPI

Overall verdict

  • SendAPI appears to be a niche API service, but limited independent information is available to fully verify its reliability, feature depth, and long-term support, so a firm 'good' rating is hard to establish without direct testing or further user reviews.

Why this product is good

  • Positioned as a developer-friendly API service for specific integration tasks
  • May offer simple setup and documentation for quick implementation
  • Could provide competitive pricing compared to larger established providers
  • Might cater to specific use cases not well served by bigger platforms

Recommended for

  • Developers looking for lightweight, specialized API solutions
  • Small projects or startups testing niche integrations before committing to larger providers
  • Users who have already vetted the service through trials or community feedback
  • Technical teams comfortable evaluating and integrating less mainstream APIs

Warmy.io videos

The Complete Warmy.io Overview ๐Ÿ”ฅ

More videos:

  • Review - What is Warmy.io?
  • Review - DecisiveTalks #17 - Warmy.io with Daniel Shnaider, Founder of Warmy.io

SendAPI videos

SendAPI

Category Popularity

0-100% (relative to Warmy.io and SendAPI)
Email Marketing
100 100%
0% 0
WhatsApp Marketing
0 0%
100% 100
Email Warm Up
100 100%
0% 0
WhatsApp Business API
0 0%
100% 100

Questions & Answers

As answered by people managing Warmy.io and SendAPI.

What makes your product unique?

SendAPI's answer:

One API key for WhatsApp, SMS and Email. No separate accounts, no fragmented billing, self-serve signup in minutes.

Why should a person choose your product over its competitors?

SendAPI's answer:

Simpler pricing, one API key for all channels, official Meta Business Solution Provider, no sales call required.

How would you describe the primary audience of your product?

SendAPI's answer:

Developers and businesses of all sizes who need reliable messaging across WhatsApp, SMS and Email.

What's the story behind your product?

SendAPI's answer:

Our founder ran a restaurant and struggled with managing separate tools for sending emails, SMS and Whatsapp messages to customers. The frustration of juggling multiple platforms, accounts and bills inspired him to build SendAPI , one simple platform that handles everything. If he needed it, thousands of other businesses do too.

Which are the primary technologies used for building your product?

SendAPI's answer:

REST API with SDKs for TypeScript, Python and Go.

User comments

Share your experience with using Warmy.io and SendAPI. For example, how are they different and which one is better?
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Reviews

These are some of the external sources and on-site user reviews we've used to compare Warmy.io and SendAPI

Warmy.io Reviews

  1. John D
    ยท CFO/CTO at SFD Media LLC ยท
    Super helpful

    Warmy provided a real person for a solid one-hour onboarding that got us up and running promptly. Dashboard is easy to use and the options for warming up and plenty of options for maintaining inbox health and placement .

    ๐Ÿ‘ Pros:    Coaching|Quick and easy|Easy user interface
  2. David Frank
    ยท Email Marketing Manager at Qwoted ยท
    A dedicated tool that blows competition out of the water

    I tried multiple platforms before settling on Warmy. I started warmup skeptical of it, but I am now convinced that having a dedicated warmup tool tool like Warmy is the best option. Warmy know they need to compete with advanced features like user and pre-made templates, behavior that mimics real behavior, constant research, and excellent customer support. In fact, it really is the latter that has made the biggest difference to how well things have gone for us.

    ๐Ÿ Competitors: Instantly.ai, Apollo.io
    ๐Ÿ‘ Pros:    Custom templates|Delayed replies|Great customer support
  3. Charles
    ยท Founder + CEO at The Sonic Treehouse ยท
    Warmy knows their stuff!

    I learned more on my first call with Warmy than anything I'd learned in the past several months of email marketing. Their team is fantastic!


Top 14 Email Warm-Up Tools for B2B SaaS
Warmy.io: AI-personalized warm-up messages, topic selection, auto-archive, and automated monitoring. Focuses on safe, global automation and multi-language flows for international teams.
Top 5 Email Warmup Tools in 2026
Warmy emphasizes automation and expansive mailbox coverage. It supports incremental sending, reply simulation, and spam recovery, with options to adjust pacing and review mailbox-level results at a glance.

SendAPI Reviews

We have no reviews of SendAPI yet.
Be the first one to post

Social recommendations and mentions

Based on our record, Warmy.io seems to be more popular. It has been mentiond 5 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Warmy.io mentions (5)

  • "Email marketing is a powerful tool, but it's only effective if your emails reach the inbox." - Unknown
    As professionals in the field, we understand the struggles that come with ensuring your messages land in the right place. But fear not, for Warmy.io is here to help you overcome the challenges of email deliverability! Our cutting-edge technology and expert guidance will pave the way to inbox success, ensuring your messages reach their intended audience. Source: about 3 years ago
  • Social Media power!
    Check http://warmy.io to empower YOUR commercials email deliverability. Source: about 3 years ago
  • Warming Up a New Domain: A Comprehensive Guide.
    However Warmy is number one expert in Email Deliverability, join us and get 7 days free trial warmy.io. Source: about 3 years ago
  • Get incredible Savings on Mailboxes with our NEW Pricing Page!
    ๐Ÿ“ฉ Contact Warmy.io for any questions:. Source: about 3 years ago
  • Pay Less, Get More!
    We're thrilled to announce that Warmy.io is launching a fantastic new feature that gives you the power to unlock incredible discounts based on the number of mailboxes you purchase. Source: about 3 years ago

SendAPI mentions (0)

We have not tracked any mentions of SendAPI yet. Tracking of SendAPI recommendations started around Apr 2026.

What are some alternatives?

When comparing Warmy.io and SendAPI, you can also consider the following products

Mailwarm - Email warmup tool to avoid spam folder, since 2020 - Backed by Email Deliverability Experts

Twilio - Brings voice and messaging to your web and mobile applications.

Folderly - Folderly is an all-in-one email deliverability platform to supercharge your email performance. Locate, solve, prevent email deliverability pitfalls, and ensure that your emails reach the Inbox folder.

WATI - No-code chatbot builder for WhatsApp Business

Warmup Inbox - Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.

MailChimp - MailChimp is the best way to design, send, and share email newsletters.