SendGrid vs Flowmailer vs SMTP vs Campaigner Comparison
SendGrid
Starting at Contact for pricing
- Free Trial
- Large Enterprises
- Medium Business
SendGrid is a complete and modern cloud communication platform that enables marketers to communicate with their customers through transactional and engagement emails. SendGrid has been shipping billions of email campaign…
Flowmailer
Starting at Contact for pricing
- Free Trial
- Large Enterprises
- Medium Business
Flowmailer is a software for sending and extracting data from transactional email. It is created to be used by websites that send transaction emails, such as e-commerce companies that need to keep their customers informe…
SMTP
Starting at Contact for pricing
- Individuals
- Freelancers / Consultants
SMTP was built to solve the challenges of sending email from devices behind restrictive firewalls or communicating directly with a server over SMTP. It features multiple design elements and components that have been opti…
Campaigner
Starting at $14 /month
- Free Trial
- Large Enterprises
- Medium Business
The Campaigner email marketing software from Constant Contact allows you to easily create, send and track professional emails and newsletters. With the help of a dedicated marketing team, it is simple to use, and will ha…
SendGrid leads on user satisfaction with a 3.4-star rating across 1,014 reviews.
SpotSaaS Analysis
SendGridFlowmailerSMTP
The core difference lies in SendGrid's focus on providing a flexible API for both transactional and marketing emails, while Flowmailer specializes in e-commerce transactional emails with strong CMS and Outlook integration. Ideal buyers for SendGrid are businesses looking for comprehensive email solutions, whereas Flowmailer caters to e-commerce companies needing direct email capabilities from their CMS or Outlook.
- Best for businesses needing robust transactional email APIs - Offers marketing automation features - Ideal for teams seeking seamless tool integration - Well-documented and flexible API - Suitable for small to medium-sized businesses - Focused on engagement and transactional emails
- Best for e-commerce transactional emails - Strong integration with CMS and Outlook - Enables direct email sending from CMS - Allows data extraction from transactional emails - Ideal for small to medium-sized businesses - Focused on enhancing e-commerce email processes
SendGrid vs Flowmailer vs SMTP vs Campaigner — at a glance
| Feature | SendGrid | Flowmailer | SMTP | Campaigner |
|---|---|---|---|---|
| Rating | 3.4 / 5 | — | 3.9 / 5 | 3.0 / 5 |
| Reviews | 1,014 | — | 16 | 595 |
| Starting price | Contact for pricing | Contact for pricing | Contact for pricing | $14 /month |
| Free trial | Yes | Yes | No | Yes |
| Free version | No | No | No | No |
| Best for | Large Enterprises, Medium Business, Small Business | Large Enterprises, Medium Business, Small Business | Individuals, Freelancers / Consultants, Large Enterprises | Large Enterprises, Medium Business, Small Business |
| Category | Transactional Email Software | Transactional Email Software | Transactional Email Software | Email Marketing Software |
| Integrations | — | — | — | 7+ apps |
| Platforms | SaaS/Web/Cloud | SaaS/Web/Cloud | SaaS/Web/Cloud | SaaS/Web/Cloud |
| API | Available | Available | Available | Available |
| Support modes | 24/7 (Live rep), Online | Business Hours, Online | 24/7 (Live rep), Business Hours, Online | 24/7 (Live rep), Online |
| Certifications | SOC 2, HIPAA, GDPR, ISO 27001 | GDPR | — | GDPR |
| Data residency | Global | US | US | US |
Key differences between SendGrid and Flowmailer
- Deployment: SendGrid supports SaaS/Web/Cloud; Flowmailer supports SaaS/Web/Cloud.
Compare SendGrid vs Flowmailer vs SMTP vs Campaigner — and walk away knowing which one fits.
Which tool fits your team best
Which is actually cheaper for your team size
Where each product wins, per real buyers
Most Transactional Email Software tools look identical on paper. This comparison cuts to the differences that matter — pricing structure, team fit, and what real buyers found after signing up.
Biggest differences
Features
Pricing
Buying details
Security
Buyer feedback
Integrations
Product tour
Other options
Talk to an expert Talk to an expert |
Biggest differences
Start here before you go deeper into features.
Best for businesses needing robust transactional email APIs and marketing automation.
- You require a well-documented, flexible API for transactional and engagement emails.
- Your team needs seamless integration with marketing automation tools.
- You are a small to medium business prioritizing reliable historical email delivery.
- You need highly responsive and proactive customer support.
- Your business cannot tolerate deliverability issues caused by IP reputation problems.
Best for e-commerce transactional emails with CMS and Outlook integration.
- You need to send transactional emails directly from your CMS or Outlook.
- Your business requires extracting data from transactional emails for processing.
- You are a small to medium business focused on order status communications.
- You require extensive marketing automation beyond transactional email capabilities.
- Transparent pricing and extensive user feedback are critical for your decision.
Individuals, Freelancers / Consultants, Large Enterprises
Large Enterprises, Medium Business, Small Business
SendGrid: Best for businesses needing robust transactional email APIs and marketing automation. Flowmailer: Best for e-commerce transactional emails with CMS and Outlook integration.
Description | SendGrid is a complete and modern cloud communication platform that enables marketers to communicate with their customers through transactional and engagement emails. SendGrid has been ... Read More about SendGrid | Flowmailer is a software for sending and extracting data from transactional email. It is created to be used by websites that send transaction emails, such as e-commerce companies that need ... Read More about Flowmailer | SMTP was built to solve the challenges of sending email from devices behind restrictive firewalls or communicating directly with a server over SMTP. It features multiple design elements and ... Read More about SMTP | The Campaigner email marketing software from Constant Contact allows you to easily create, send and track professional emails and newsletters. With the help of a dedicated marketing team, ... Read More about Campaigner |
|---|---|---|---|---|
Entry Level Pricing |
|
|
|
|
Free Trial Availability |
| |||
Spotsaas ScoreWhat's this? ↗ | 9.8/10 | 8.4/10 | 7.2/10 | 8.8/10 |
User RatingsBased on verified Spotsaas reviews | ||||
Best Company Size | Small BusinessMedium Business | Small BusinessMedium Business | 50 to 500 employees | 50 to 500 employees |
Get pricing help | Get pricing help |
Where each option fits best
See where each product is strongest, which teams it fits, and what causes buyers to keep looking — before you commit.
Based on buyer reviews and verified product data collected by Spotsaas.
Key strengths
No key benefits available yet.
No key benefits available yet.
- Reliable Email Delivery: With SMTP, you can ensure that your emails reach their intended recipients without fail. I’ve seen firsthand how businesses benefit from reduced bounce rates and enhanced communication efficiency.
- Scalability: Whether you’re sending a few emails or millions, SMTP scales effortlessly to accommodate your growing needs. This flexibility has proven invaluable for companies looking to expand their outreach without worrying about technical limitations.
- Security Features: Implementing SMTP protocols enhances the security of your email communications. I recommend leveraging its built-in encryption methods to safeguard sensitive information and instill confidence in your stakeholders.
- Streamlined Email Marketing Automation: With Campaigner, managers can effortlessly automate their email campaigns, saving valuable time while ensuring that no customer is left behind. This means you can focus on strategy while our platform handles the routine.
- Advanced Segmentation Capabilities: Administrators will appreciate the powerful segmentation tools that allow for highly targeted messaging. This ensures that your emails resonate with specific audience segments, ultimately driving higher engagement rates and conversions.
- Robust Analytics and Reporting: Executives benefit from Campaigner’s comprehensive analytics dashboard, which provides actionable insights into campaign performance. You can easily track open rates, click-through rates, and ROI to make informed decisions moving forward.
Best fit
No best-fit guidance available yet.
No best-fit guidance available yet.
- 50 to 500 employees
- Martech, Fintech, SaaS, E-commerce, and Digital Marketing
- Marketing Managers, IT Administrators, Email Marketing Specialists, Sales Executives, and Customer Success Managers
- 50 to 500 employees
- Martech, Revtech, SaaS, and Consulting
- Marketing Managers, Email Marketing Specialists, Digital Marketing Coordinators, and Campaign Strategists
Reasons buyers look elsewhere
No alternatives guidance available yet.
No alternatives guidance available yet.
- Users may seek alternatives to SMTP due to deliverability issues, as emails can often be marked as spam or face filtering challenges, impacting communication effectiveness and business operations.
- Security concerns are a common reason for exploring alternatives; SMTP lacks advanced encryption and authentication measures, making it vulnerable to interception and unauthorized access.
- The increasing need for real-time communication drives users towards alternatives that offer instant messaging or collaboration features, which are not supported by traditional SMTP protocols.
- Users may seek alternatives to Campaigner due to its pricing structure, which could be perceived as high for small businesses or startups looking for more budget-friendly email marketing solutions.
- Some users might find Campaigner's user interface less intuitive compared to competitors, prompting them to explore platforms that offer a more streamlined and user-friendly experience for their email campaigns.
- The need for advanced automation features can drive users away from Campaigner, especially if they require more sophisticated workflows that are better supported by other email marketing tools in the market.
Software Demo
Demo |
|---|
Need a second opinion?
Get shortlist help from a software advisor
Share your priorities, budget, and team needs, and we’ll help you narrow the options and understand the tradeoffs before you talk to vendors.
How do SendGrid, Flowmailer, SMTP and Campaigner Compare on Features?
Total Features | 35 Features | 12 Features | 5 Features | 20 Features |
|---|---|---|---|---|
Unique Features | No unique features | No unique features | No unique features | No unique features |
Get Quote | Get Quote |
Compare SendGrid, Flowmailer, SMTP and Campaigner on pricing
Review starting price, plan structure, and free-trial access side by side so you can see which option fits your budget and buying process.
Pricing Option | ||||
|---|---|---|---|---|
Starting From |
|
|
|
|
Pricing Plans |
|
|
|
|
Pricing Page |  |  |  |  |
Other Details
Organization Types supported |
|
|
|
|
|---|---|---|---|---|
Platforms Supported |
|
|
|
|
Modes of support |
|
|
|
|
API Support |
|
|
|
|
Get help choosing | Get help choosing |
Security & Compliance
Certifications, data handling, and security controls for IT and compliance evaluators.
SOC 2 | ✓ Yes | — |
|---|---|---|
HIPAA | ✓ Yes | — |
GDPR | ✓ Yes | ✓ Yes |
ISO 27001 | ✓ Yes | — |
Single Sign-On (SSO) | ✓ Yes | — |
Multi-Factor Auth (MFA) | ✓ Yes | — |
Data Encryption | ✓ Yes | ✓ Yes |
Audit Logs | ✓ Yes | — |
Data Residency | 🌐 Global | 🇺🇸 US |
SendGrid vs Flowmailer vs SMTP User Reviews & Rating Comparison
User Ratings | No reviews available for the product | 3 (based on 595 reviews) | ||
|---|---|---|---|---|
Rating Distribution | No reviews available for this product | |||
Spotsaas Editor’s POV generated by AI | Buyer sentiment Users appreciate SendGrid's API and integration capabilities but express frustration over poor customer support, account suspensions, and deliverability challenges. What buyers like
Common complaints
| Buyer sentiment Insufficient user reviews and ratings to determine overall sentiment. What buyers like
Common complaints
| Buyer sentiment Buyer sentiment is mixed to positive across 11 reviews, with clear strengths and a few common watchouts. What buyers like
Common complaints
| Buyer sentiment Buyer sentiment is mixed across 595 reviews, so it is worth reviewing the tradeoffs closely. What buyers like
Common complaints
|
Pros and Cons |
|
|
|
|
Positive Reviews | No reviews available for the product | No reviews available for the product | No reviews available for the product | No reviews available for the product |
| Negative Reviews | No reviews available for the product | No reviews available for the product | No reviews available for the product | No reviews available for the product |
Integrations
Integration with other apps | No Integration information available. | No Integration information available. | No Integration information available. |
|---|
List of Customers
Customers | No Customers information available. |  dpd  Tele2  Pathe | No Customers information available. |  LG  The UPS Store  CLARINS |
|---|
Media and Screenshots
Screenshots |  6 Screenshots | No screenshots available. |
|---|---|---|
Videos |  4 Videos |  1 Videos |
Alternatives
Alternatives |
|---|
Add another option to compare side by side
Search by product name to compare pricing, fit, and buyer feedback in one view.Compare similar software options
Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].
Frequently asked questions
- Which is better, SendGrid or Flowmailer?
- SendGrid edges out the other on user ratings (3.4 vs -1.0). That said, the best pick depends on your use case — use the comparison tables above to evaluate each dimension.
- Do SendGrid and Flowmailer offer a free trial?
- Yes, both SendGrid and Flowmailer offer a free trial.
- What is the starting price of SendGrid vs Flowmailer?
- SendGrid starts at Contact for pricing. Flowmailer starts at Contact for pricing.
- What are the top alternatives to SendGrid?
- Top alternatives to SendGrid include SMTP, Campaigner, Moosend, Mailgun, Pepipost.
- What are the top alternatives to Flowmailer?
- Top alternatives to Flowmailer include SMTP, Campaigner, Moosend, SendGrid, SMTP2GO.