Mailersend vs SendGrid
Compare Mailersend and SendGrid based on observed API performance, features, and pricing
Live performance comparison
Real-world performance data from messages sent through Knock
| Provider | Message volume | Growth | Status page updates (30d) | Status page updates (90d) |
|---|---|---|---|---|
 | <1M | 8th of 10 ↑ | 2 | 3 |
 | 500M+ | 2nd of 10 → | 13 | 25 |
From January 1st to March 31st, Knock routed <1M messages through Mailersend and 500M+ through SendGrid. Mailersend reported 3 status page updates over the last 90 days, while SendGrid reported 25.
Response time
Response time measures how long each provider takes to accept an API request from Knock, including connection overhead and any automatic retries. Lower values mean faster message hand-off.
| Provider | Median (p50) | p90 | p95 | p99 |
|---|---|---|---|---|
| 264ms | 548ms | 589ms | 802ms |
| 22ms | 76ms | 81ms | 261ms |
The chart above shows each provider's daily median response time (p50) from January 1st to March 31st. The top-line number is an average of these daily values: Mailersend averaged 264ms compared to 22ms for SendGrid. Mailersend's highest daily p50 was 469ms; SendGrid's was 28ms. SendGrid is 242ms faster at the median, which can add up at high volumes.
The 90th percentile (p90) captures the slowest 10% of requests, revealing how each provider handles moderate stress. Averaged across all days, Mailersend has a p90 of 548ms compared to 76ms for SendGrid. The highest daily p90 was 1048ms for Mailersend and 98ms for SendGrid. SendGrid handles these slower requests 472ms faster, suggesting more consistent performance across the board.
The 99th percentile (p99) represents the long tail — the slowest 1% of requests. Averaged across all days, Mailersend reached 802ms at p99 while SendGrid reached 261ms. The highest daily p99 was 12094ms for Mailersend and 1255ms for SendGrid, indicating the worst-case response time during spikes or provider-side congestion. SendGrid shows a tighter tail, which may matter for time-sensitive notifications like one-time passwords or real-time alerts where even rare delays can impact user experience.
Error rate
Error rate tracks the ratio of 5xx responses and timeouts to total requests. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
| Provider | Avg. daily error rate | Highest daily rate | Peak error date | Zero-error days | Days above 0.01% |
|---|---|---|---|---|---|
| 0.01% | 0.06% | Feb 18 | 84 | 4 |
| 0.00% | 0.02% | Jan 21 | 80 | 4 |
Averaged across the date range, Mailersend shows a 0.01% daily error rate compared to 0.00% for SendGrid. The highest single-day error rate was 0.06% for Mailersend and 0.02% for SendGrid. Both providers show similar reliability levels, with error rates well within acceptable thresholds. Knock automatically retries failed requests to both providers, minimizing the impact of transient errors on end-user delivery.
About these metrics: Data represents messages sent through Knock during the specified period. Response time measures time from Knock to provider acceptance. Error rate includes only provider 5xx responses and timeouts.
Recent Mailersend incidents
Recent status page incidents for Mailersend
Ongoing since Mar 30, 2026
Status: Scheduled Our database service provider will be performing scheduled maintenance that should take no longer than 15 minutes. During this time, you may experience brief interruptions when signing up, logging in, or switching accounts on MailerSend. We appreciate your patience and thank you for your continued trust in our services. Affected components MailerSend APP (Under maintenance)
Started Mar 3, 2026 — Resolved Mar 3, 2026
Status: Complete Maintenance has completed Affected components Bulk endpoint (Under maintenance) SMTP (Under maintenance) Delivery time (Under maintenance) Email sending API (Under maintenance) Deliverability rate (Under maintenance)
Started Feb 19, 2026 — Resolved Feb 19, 2026
Status: Resolved The issue has been resolved and systems have returned to normal. We’ll continue monitoring to ensure ongoing stability. Thank you for your patience. Affected components MailerSend APP (Operational)
Recent SendGrid incidents
Recent status page incidents for SendGrid
Ongoing since Apr 11, 2026
THIS IS A SCHEDULED EVENT Apr 11, 04:00 - 08:00 PDTMar 31, 12:23 PDT Scheduled - In order to increase the stability and scalability of our systems, we are performing scheduled maintenance on our Production database on Saturday, April 11, from 4PM-8PM PDT. During this time, incoming category statistics will be delayed in being written to the database, and metrics may lag as a result. Requests for category statistics may also be temporarily unavailable while we perform the maintenance. Thank you
Started Mar 25, 2026 — Resolved Mar 25, 2026
Mar 25, 13:58 PDT Resolved - From 9:08 AM PT - 9:22AM PT today, customers in the EU region may have experienced mail delay for up to 14 minutes. Customer may have received "Internal Deferral" errors when attempting to send mail at this time. Our engineers have investigated and resolved the issue. All impacted services are operating normally.
Started Mar 19, 2026 — Resolved Mar 19, 2026
Mar 18, 19:17 PDT Resolved - Our engineers have monitored the fix and confirmed the issue with CAPTCHA has been resolved. All services are now operating normally at this time.Mar 18, 14:54 PDT Monitoring - Our engineers have implemented a fix and are monitoring system performance. Users that were previously impacted by failed CAPTCHA errors should now have the capacity to login without issue. We will provide another update in an hour or as soon as more information becomes available.Mar 18, 14:32
Started Mar 19, 2026 — Resolved Mar 19, 2026
Mar 18, 19:00 PDT Completed - The scheduled maintenance has been completed.Mar 18, 17:00 PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Mar 15, 09:57 PDT Scheduled - To ensure our support tools stay fast and reliable, we’ll be performing some scheduled maintenance on Wednesday, March 18th, from 5:00 PM to 7:00 PM PDT. During this two-hour window, our Live Chat and Personalized Support phone lines will be temporarily unavailable. Here’s how
Started Mar 11, 2026 — Resolved Mar 11, 2026
Mar 10, 18:00 PDT Completed - The scheduled maintenance has been completed.Mar 10, 17:30 PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Mar 9, 07:16 PDT Scheduled - As part of correcting an inaccurate timestamp in the response from our Spamreport API request, we will be performing database maintenance on March 10th, from 5:30 to 6:00pm PT. During this time, customers will be unable to access the public API and v2 equivalent APIs and all Sp
Pros and cons
Mailersend
SendGrid
Pros
- Designed for both developers and business users with API and visual editor
- Modern, intuitive UI that is easier to navigate than older platforms
- Multi-channel support with native email and SMS transactional messaging
- Affordable Hobby plan at $7/month for 5,000 emails with low overage rates
Pros
- Comprehensive documentation with SDKs for most major languages
- Rich analytics tools with programmatic API access to engagement data
- Strong focus on deliverability with AI-powered intelligent delivery
- Trusted by Uber, Booking.com, and Yelp for high-volume sending
Cons
- Available integrations with other tools are basic and limited
- Fewer advanced features than enterprise platforms
- Smaller ecosystem compared to established competitors
Cons
- Extended email activity history requires a paid add-on
- Pricing can become complex at higher volumes
- Support response times vary by plan tier
Frequently asked questions
What is the difference between Mailersend and SendGrid?
Mailersend is an intuitive transactional email and SMS service by Mailgun, designed for growing businesses. SendGrid is a cloud-based email delivery platform owned by Twilio, known for high-volume transactional and marketing email. Mailersend is best suited for growing saas + e-commerce, while SendGrid is geared toward high-volume transactional + marketing.
Which is cheaper, Mailersend or SendGrid?
Free tier includes 500 emails per month. Paid plans start at $7/month for 5,000 emails on the Hobby plan, with the Starter plan at $35/month for 50,000 emails. Free tier includes up to 100 emails per day for 60 days. Paid plans start at $19.95/month for 50,000 emails on the Essentials plan, with an Essentials 100K tier at $34.95/month. Pro plans with dedicated IPs start at $249/month for 300,000 emails. The best value depends on your sending volume. Use the pricing calculator above to compare costs at your expected volume.
Which is faster, Mailersend or SendGrid?
Based on real-world data from Knock, Mailersend has a median API response time (p50) of 264ms compared to 22ms for SendGrid.
Which is more reliable, Mailersend or SendGrid?
From January 1st to March 31st, Mailersend showed an error rate of 0.01% while SendGrid showed 0.00%. Both rates are within acceptable thresholds for production email delivery, and Knock automatically retries failed requests to minimize the impact of transient errors.
Which is more popular, Mailersend or SendGrid?
On the Knock platform, Mailersend handled <1M messages from January 1st to March 31st compared to 500M+ for SendGrid. Mailersend is currently trending upward in adoption, while SendGrid volume has remained stable.
Can I use both Mailersend and SendGrid together?
Yes. Knock enables you to integrate multiple email providers into a single notification workflow. You can use Mailersend and SendGrid side by side, route traffic between them, or migrate from one to the other without changing your application code.
What are the main pros and cons of Mailersend vs SendGrid?
Mailersend strengths include designed for both developers and business users with api and visual editor and modern, intuitive ui that is easier to navigate than older platforms. SendGrid strengths include comprehensive documentation with sdks for most major languages and rich analytics tools with programmatic api access to engagement data. On the other hand, Mailersend drawbacks include available integrations with other tools are basic and limited, while SendGrid drawbacks include extended email activity history requires a paid add-on.
Use either provider with Knock
Knock enables you to integrate Mailersend, SendGrid, or any combination of email providers into a single notification workflow. Manage templates, orchestrate cross-channel delivery, and switch providers without changing your code.