Knock vs Twilio SendGrid (2026): which should you pick?
As of Nov 13, 2026, Twilio SendGrid grades higher than Knock: 2.6 against 2.2 out of 4.0.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
Knock grades higher on the free plan. Twilio SendGrid grades higher on value for money and features. They get the same grade on ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Knock
Cross-channel notification and messaging workflows for products
Twilio SendGrid
Twilio's email API and SMTP service, priced by monthly email volume
Which one is for you
Pick Knock if
- Fits if you're a product team and want one workflow to reach email, in-app and chat
- Works for apps that already have an email provider and need preferences and batching on top
Look elsewhere if
- Skip it if you want a service that sends email by itself: it needs a provider you connect
- Pricey if you outgrow free, because the next step is $250 a month
- Tight if you want the Knock branding gone, as that needs Starter or higher
- Watch out: email client previews, SAML SSO, SCIM and translations sit on dearer plans, and the HIPAA BAA is Enterprise only
Pick Twilio SendGrid if
- Fits if you already use Twilio for texts or calls and want email from the same company
- Works for apps sending about 50,000 emails a month that want address checks, with 2,500 validations on Pro
Look elsewhere if
- Tight if you stay on Essentials, with 1 teammate and 3 days of email activity
- Skip it if you want a free plan that lasts, since the trial ends after 60 days
- Pricey if you need SSO, subusers or a dedicated IP, which start with Pro at $89.95 a month
- Watch out: sending past your plan's volume can add overage charges the pricing page doesn't list
- Not for you if you want newsletters on the same plan, as Marketing Campaigns is separate, from $15 a month
How we grade them
| 2.2GPAKnockFair | 2.6GPATwilio SendGridGood | |
|---|---|---|
| Value for money | D$250 a month for Starter, plus $0.005 for each message past 50,000. Email sending tools start around $9, the dearest tenth begins at $68. | BGraded on 50,000 emails a month: Essentials is $19.95 for exactly that, in the lowest-priced quarter of this category at that volume. It comes with 1 teammate and 3 days of activity, and Pro at $89.95 is where dedicated IPs and SSO start. |
| Free plan and trial | BFree plan with 10,000 messages sent a month, unlimited workflows, profiles and team members, and no card needed. One small product could stay on it. | CNo lasting free plan, but a 60-day trial with no card: 100 emails a day, enough to wire it into your app and test. After that you're paying. |
| Features | CCross-channel workflows, broadcasts, in-app guides, batching and preferences. Email goes through SendGrid, Postmark or SES, so it isn't a sending service on its own. | BAPI and SMTP, event webhooks, an inbound parse webhook, dynamic templates, domain authentication, address validation and EU data residency. That covers the job. Testing credits, subusers and dedicated IPs wait for Pro. |
| Ease of use | CNo store rating on record. You wire it into your app and connect providers before anything sends. | CJudged on how fast a developer sends a first email: client libraries, interactive API docs and a setup guide on every plan, but you'll authenticate a domain before mail goes out properly. No rating on record. |
| Platforms and integrations | BWeb dashboard with SDKs and an API, plus connections to SendGrid, Postmark, Amazon SES, Mailgun, Slack and others. | BWeb, with a REST API, client libraries, SMTP and webhooks, so anything that speaks SMTP can use it. The listing names no ready-made integrations, and there's no desktop or phone app, so B is the top. |
| Best for | product notifications on many channels | app email for teams already on Twilio |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Knock and Twilio SendGrid. How we grade
Price against what you get
Knock starts at $250 a month and scores 2.3 out of 4 on features, ease of use and platforms. Twilio SendGrid starts at $19.95 a month and scores 2.7.
Twilio SendGrid scores higher and starts $230.05 a month lower. Of the other email sending services on the chart, 15 score higher than Knock for less, and none scores higher than Twilio SendGrid for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Knock also covers workflow automation.
- Twilio SendGrid also covers email verification.
At a glance
| Knock | Twilio SendGrid | |
|---|---|---|
| Pricing | Free plan | Free trial |
| Starts at | $250 per month, plus usage beyond 50,000 messages | $19.95 per month for 50,000 emails |
| Free plan | Up to 10,000 messages sent, 500 guide recipients and 500 agent credits a month, with unlimited workflows, profiles, channels and team members. | None |
| Free trial | None listed | 60-day free trial with 100 emails a day, no credit card required |
| Web | ||
| Made by | Knock Labs, Inc. | Twilio Inc. |
| Price read from | knock.app | twilio.com |
| Checked | Nov 13, 2026 | Oct 18, 2026 |
Worth knowing
Knock
- Knock is an orchestration layer, so email delivery goes through a provider you connect; it is not a standalone sending service.
- The jump from Free to Starter is $250 a month, with messages beyond 50,000 billed at $0.005 each.
- Removing Knock branding, email client previews and priority email support need Starter or higher.
- Custom roles, SAML SSO, SCIM, translations and the HIPAA BAA are listed on Enterprise only.
Twilio SendGrid
- There is no lasting free plan: the free trial ends after 60 days and allows 100 emails a day.
- Essentials has a single teammate and keeps 3 days of email activity; dedicated IPs, subusers and SSO need Pro at $89.95 a month.
- Sending past the plan's volume can add overage charges, which the pricing page does not list.
- Email campaigns are a separate product, Marketing Campaigns, from $15 a month for 5,000 contacts and 15,000 emails.
Key features
Knock
- Cross-channel workflows
- A workflow is a single type of message, such as a user invite, that can branch, delay and route across email, in-app, push, SMS and chat.
- Broadcasts and in-app guides
- Broadcasts send a one-time message to an audience on any channel. In-app guides cover banners, modals, cards and tooltips rendered with your own components.
- Batching and preferences
- Batch and digest notifications to cut frequency, and let recipients manage preferences by channel, notification and category.
- Email through your own provider
- The integrations list names email providers including SendGrid, Postmark, Amazon SES, Mailjet, Mailgun, Mailtrap and MailerSend.
- Agent and MCP access
- Workflows, templates, guides, broadcasts and audiences can be managed from Claude, ChatGPT, Cursor and Slack, through a remote MCP server or the Knock CLI.
- Multi-tenancy
- Built-in multi-tenancy is listed on every plan, and per-customer branding and preferences on Enterprise.
Twilio SendGrid
- Email API and SMTP relay
- Send through a REST API with client libraries or through SMTP, with interactive API docs and a setup guide on every plan.
- Deliverability tools
- SPF and DKIM domain authentication, link branding, reverse DNS and suppression management on every plan; Pro adds dedicated IPs, IP pools and automated IP warm-up.
- Webhooks and analytics
- Event webhooks report deliveries, opens, bounces and blocks, and an inbound parse webhook turns received email into data your app can read.
- Email address validation
- A validation API checks addresses before you send; Pro includes 2,500 free validations and Premier 5,000.
- Dynamic templates and testing
- A template editor on every plan, and from Pro, 60 email testing credits a month for previews before sending.
- Security and compliance
- Two-factor sign-in, TLS encryption, IP access management, SOC 2 Type II and an EU data residency option, with single sign-on from Pro.
Plans
Knock
Free$0
Up to 10,000 messages sent, 500 guide recipients and 500 agent credits each month. No credit card required.
Starter$250
per month, plus additional usage
Includes 50,000 messages (then $0.005 each), 2,500 guide recipients and 2,000 agent credits. Removes Knock branding; adds email client previews.
EnterpriseCustom
Annual agreements with volume-based pricing, custom roles, SAML SSO, SCIM, enterprise SLAs, HIPAA BAA and priority support over Slack, email and calls.
Twilio SendGrid
Essentials$19.95
per month for 50,000 emails
SMTP and API sending, analytics, 1 teammate, 2 event webhooks and 3 days of email activity. $34.95 a month at 100,000 emails.
Pro$89.95
per month for 100,000 emails
1 dedicated IP, subusers, SSO, 1,000 teammates, 2,500 email validations, testing credits and 7 days of activity. $249 a month at 300,000 emails.
PremierCustom
Custom volume, 5,000 email validations and expert email program management, sold through sales.
Common questions
Which is cheaper, Knock or Twilio SendGrid?
As of Nov 13, 2026, Twilio SendGrid is cheaper to start with: $19.95 a month, against $250 a month for Knock. Knock starts at $250 per month, plus usage beyond 50,000 messages, and Twilio SendGrid starts at $19.95 per month for 50,000 emails.
Which has a free plan, Knock or Twilio SendGrid?
As of Nov 13, 2026, only Knock has a free plan. Twilio SendGrid does not, though it has a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.