SendGrid Alternative
The Best SendGrid Alternative for Transactional Emails
Keplars helps developers send transactional emails, OTPs, password resets, invoices and notifications through APIs, SMTP, templates and webhooks. Built for teams looking for a simpler SendGrid alternative.
Why Teams Look For a SendGrid Alternative
Many startups begin with SendGrid but later seek alternatives due to setup complexity, onboarding friction, pricing concerns or the need for a more developer-friendly experience.
Keplars simplifies email infrastructure by combining APIs, SMTP, webhooks, templates, analytics and OAuth email sending into a single platform, making it the transactional email API teams reach for when they outgrow SendGrid.
- Setup Complexity
SendGrid requires domain verification, sender authentication, and IP warm-up before you can reliably send in production. Keplars lets you start with OAuth in minutes. No DNS required.
- Pricing Friction
SendGrid pricing scales in fixed tiers that often leave teams paying for capacity they do not use. Keplars uses fully usage-based pricing so you pay for what you actually send.
- Feature Sprawl
Teams often find themselves using SendGrid alongside other tools for templates, analytics, and automations. Keplars is a unified platform that covers all of these natively.
SendGrid vs Keplars Feature Comparison
| Feature | Keplars | SendGrid |
|---|---|---|
| Email API | REST API with simple HTTP calls | REST API |
| SMTP | Port 587, STARTTLS, drop-in replacement | Available |
| OAuth Email Sending | Gmail, Google Workspace, Outlook | Not supported |
| SDKs | 11 languages | 8 languages |
| CLI | Full CLI tool for developers | Not available |
| Email Templates | AI-generated + unified drag & code editor | Drag-and-drop only |
| Canva / Figma Import | Import designs and send directly | Not supported |
| Real-time Tracking | Open time, delivered time, click time | Basic open and click rates |
| Webhooks | All lifecycle events, included | Event-based |
| Automations | Included with AI-generated templates | Limited, requires upgrade |
| Mailbox Warmup | Included | Not available |
| Sandbox Mode | Full sandbox. Test without sending real emails | Partial, available on some plans |
| Analytics | Real-time dashboard, all plans | Available on paid tiers |
| Domain Authentication | Auto-managed SPF, DKIM, DMARC | Manual setup required |
| Integrations | Vercel, Firebase, Supabase, Lovable, n8n, Zapier, Bubble, Payload CMS, PocketBase, React Email, and more | Segment, Zapier, limited modern dev stack |
| Marketing Email Pricing | Usage-based. Pay per email sent, not contacts stored | Contact + volume hybrid from $15/mo, overage fees apply |
| Support | Responsive, all plans | Depends on tier |
Why Developers Choose Keplars Over SendGrid
- Faster Onboarding
Connect via OAuth with Gmail or Google Workspace and send your first email in minutes, not days. No DNS configuration required to get started.
- OAuth Email Sending
Send transactional emails authenticated via OAuth from Gmail, Google Workspace, and Microsoft Outlook. Keplars uses your real inbox reputation for maximum deliverability.
- Unified Platform
APIs, SMTP, webhooks, templates, analytics, and automations in one place. No stitching together separate tools or upgrading tiers to unlock features.
- Developer Experience
Clean REST APIs, clear documentation, predictable behavior, and detailed delivery logs. Built for engineers who want to move fast without surprises.
- Transparent Pricing
Usage-based pricing with no hidden tier gates. You pay for what you actually use: emails, domains, webhooks, and team members. No flat overage charges.
- Modern APIs
Well-documented REST APIs with straightforward request/response patterns. Integration takes minutes, not days, regardless of your tech stack.
- Strong Deliverability
99.77% inbox rate backed by Gmail, Google Workspace, and Outlook infrastructure with SPF, DKIM, and DMARC auto-configured for every domain.
- Real-Time Event Tracking
See delivery, open, click, bounce, and spam events in real time. Full event timelines for every email so nothing gets lost between sent and delivered.
Built for Modern Transactional Emails
Secure, branded password reset links delivered instantly to your users.
One-time password codes that arrive in under 5 seconds, every time.
Passwordless login links sent and received in seconds for frictionless auth.
Welcome emails, account alerts, and product updates delivered reliably.
Payment success, failure, and retry notifications sent automatically.
Invoices and receipts as HTML or PDF delivered straight to customer inboxes.
Trial expiry, renewal reminders, and subscription change confirmations.
Changelog announcements and feature notifications your users actually want to see.
How to Migrate From SendGrid to Keplars
Switch in under an hour. No downtime required. Your subjects, recipients, and HTML stay exactly the same.
Sign up at dash.keplars.com, go to API Keys, and create a key. Takes under a minute.
Run bun add @keplars/sdk for JavaScript or pip install keplars for Python.
Swap the SendGrid client with Keplars. Two lines change. Everything else stays the same.
Paste your existing webhook endpoint URL into the Keplars dashboard. Event names map one-to-one.
Flip sandbox mode on in the dashboard and send without delivering real emails during verification.
Before vs After
import sgMail from '@sendgrid/mail';
sgMail.setApiKey(process.env.SENDGRID_API_KEY);
await sgMail.send({
to: '[email protected]',
from: '[email protected]',
subject: 'Welcome!',
html: '<h1>Welcome aboard</h1>',
});import { Keplars } from '@keplars/sdk';
const keplars = new Keplars({
apiKey: process.env.KEPLARS_API_KEY,
});
await keplars.emails.sendInstant({
to: ['[email protected]'],
subject: 'Welcome!',
html: '<h1>Welcome aboard</h1>',
is_html: true,
});Webhook event names
Templates, suppression lists, and contact management all carry over. Full details in the migration guide.
Why Startups Prefer Keplars
- Developer-First Workflow
Keplars is built around the way developers actually work. Clean APIs, no-code template editor, OAuth onboarding, and sandbox testing, all available from day one.
- Faster Setup, Less Friction
Start sending in minutes with OAuth. No mandatory DNS setup, no waiting for domain warm-up, no multi-day review processes before you can send a single email.
- Flexible APIs
REST API and SMTP relay work with any language or framework. Whether you are using Node.js, Python, Go, Ruby, or PHP, integration is straightforward and documented.
- Lower Operational Complexity
One platform for all your transactional email needs. Avoid managing multiple tools for templates, analytics, webhooks, and delivery. Keplars brings it all together.
- Email Visibility
See exactly what happened to every email: delivered, opened, clicked, bounced, or flagged as spam. Full event timelines, real-time dashboards, and alert monitoring.
- Centralized Email Infrastructure
Manage all your sending domains, connected mailboxes, API keys, templates, and automations from a single dashboard. One source of truth for your email stack.
Frequently Asked Questions
Stop paying for email capacity you don't use
Disclaimer: Comparisons are provided for informational purposes only and are based on publicly available data at the time of publication.
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