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Lifetime DealNewRocketHubMarketing & SalesEmail Marketing
Keplars — Email infrastructure without SMTP pain
Tool Overview
Getting email working in a new product used to mean wrestling with DNS records, SMTP credentials, and domain warm-up delays before a single message could leave the server. Keplars shortcuts the whole process by letting teams connect Gmail, Google Workspace, or Outlook via OAuth and start sending in minutes.
The platform handles both transactional emails (password resets, OTPs, order confirmations) and marketing campaigns from a single dashboard, with real-time delivery tracking down to the individual event level. Infrastructure runs across Leaseweb, AWS, and SUMMIT data centers, with 99.77% deliverability reported across sends.
Date added September 27, 2026
Our Take on Keplars
Keplars addresses a real pain point: the amount of infrastructure work that sits between a developer and their first outbound email. The OAuth-based onboarding genuinely removes the DNS and SMTP friction that slows down early-stage builds, and the sandbox environment for pre-production testing is a feature many competitors skip or charge extra for.
The platform is young, founded in January 2026, with a small team and a bootstrapped stage. For teams sending under 100k emails per month, the value is clear. At higher volumes, the per-email cost structure gets less predictable, and mature alternatives like Resend or Postmark have longer track records.
The RocketHub LTD does not support plan upgrades or code stacking after purchase, so picking the right tier from the start matters. Agencies and multi-product teams will want to assess the highest tier carefully before committing.
At a Glance
What stands out
OAuth onboarding lets you connect Gmail or Outlook and send production-ready emails in under five minutes, with no DNS records or SMTP credentials required at the start.
A built-in sandbox mode lets you test templates, triggers, and flows against real logic without touching production inboxes or burning through your email quota.
Both transactional and marketing emails run from the same dashboard, eliminating the need to maintain a separate tool for campaigns alongside your API-triggered sends.
The Enceladas editor combines drag-and-drop, raw code, and Canva or Figma import in one interface, so designers and developers can work on templates without handoffs.
Things to note
The company was founded in January 2026 and has a team of 1 to 10 people, which means the product is early-stage and support depth or long-term continuity carries the usual startup risk.
RocketHub plan tiers on this deal cannot be upgraded or stacked after purchase, so you need to select the tier your volume can grow into before buying.
The highest LTD tier caps sends at 100k emails per month; teams needing more need to contact support for add-on capacity, which is not self-serve at the time of launch.
Per-email cost at scale is less transparent than flat-rate competitors, and at high volumes, established providers like Resend or Postmark may offer more predictable economics.
Tiers Comparison
| Feature | Tier 1 | Tier 2 | Tier 3 |
|---|---|---|---|
| Monthly Emails | ~10,000 | ~50,000 | 100,000 |
| OAuth Sending (Gmail/Outlook) | ✅ | ✅ | ✅ |
| Custom Domain (SPF/DKIM/DMARC) | ✅ | ✅ | ✅ |
| REST API & SMTP Access | ✅ | ✅ | ✅ |
| Sandbox Testing | ✅ | ✅ | ✅ |
| Real-Time Delivery Logs | ✅ | ✅ | ✅ |
| Marketing Campaigns | ✅ | ✅ | ✅ |
| Enceladas Template Editor | ✅ | ✅ | ✅ |
| Mailbox Warmup | ✅ | ✅ | ✅ |
| Multi-Account/Client Support | Limited | ✅ | ✅ |
| Best For | Indie hackers & MVPs | Growing startups | Agencies & high-volume teams |
Deal Details
Deal TypeLifetime Deal
Current Price$49
Refund PolicyRocketHub standard refund policy applies; check deal page for current terms.
PlatformRocketHub
FoundedJanuary 2026
Team Size1-10 employees
HeadquartersDelaware, USA
FundingBootstrapped
What's Included in the deal
Sending & Delivery
OAuth sending via Gmail, Google Workspace, or Outlook
Custom domain support with SPF, DKIM, and DMARC
REST API and SMTP relay with multi-language SDKs
Real-time per-email event timeline (sent, delivered, opened, clicked, bounced)
Mailbox warmup to protect sender reputation
99.77% reported deliverability across regions
Building & Testing
Enceladas editor combining drag-and-drop, raw HTML, and AI generation
Canva and Figma design import for templates
Sandbox environment for pre-production testing
Marketing campaign builder with scheduling and list segmentation
Webhook support and native integrations with n8n, Zapier, Firebase, and Vercel
24/7 support included on all plans
Founder and Company Information
Keplars was founded by Debojyoti Singha and Ananya Singha, who launched the product on Product Hunt in April 2026. By mid-2026 the platform had delivered over 10 million emails.
The company incorporated in Delaware and is fully bootstrapped, with a stated mission to make email infrastructure something founders start with rather than fight through.
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Keplars's Key Features
OAuth Email Sending — Connect Gmail, Google Workspace, or Outlook via OAuth and start sending immediately, using your existing sender reputation without touching DNS or SMTP settings.
Transactional API — Send password resets, OTPs, order confirmations, and alerts through a REST API or SMTP relay with SDKs for Node.js, Python, Go, PHP, and other major languages.
Marketing Campaigns — Schedule and send broadcast campaigns to segmented lists with open, click, and conversion tracking, all from the same platform handling your product emails.
Sandbox Testing — An isolated sandbox environment lets you validate templates, triggers, and delivery flows before going live without touching real inboxes or your sender reputation.
Real-Time Delivery Log — Every email gets a full event timeline covering queued, sent, delivered, opened, clicked, and bounced states, viewable live in the dashboard with no log-digging required.
Enceladas Template Editor — One editor for drag-and-drop design, raw HTML, and AI-generated layouts, with the ability to import Canva or Figma designs directly as email templates.
Keplars's Use Cases
Indie developers and early-stage founders building MVPs who need transactional email working in an afternoon without configuring SMTP or waiting for domain review.
Digital agencies managing email infrastructure for multiple clients who want isolated sending accounts and fast onboarding per client under one dashboard.
No-code and automation builders using tools like n8n, Zapier, or Bubble who need a clean API endpoint to trigger email sends without managing an SMTP server.
Product and backend developers on Next.js, Firebase, or Supabase stacks who want delivery visibility per email without stitching together multiple logging tools.
Watch it in action
Similar Alternatives to Keplars
Resend
Developer-focused transactional email API with clean documentation and strong deliverability, priced at $20 per month for 50,000 emails but without built-in marketing campaign tools.
Postmark
Long-established transactional email service with a strong deliverability reputation and reliable API, but requires full DNS setup before sending and does not handle marketing campaigns.
Amazon SES
Extremely low cost at around $0.10 per 1,000 emails but requires IAM configuration, AWS console knowledge, and significant setup work before the first email can be sent.
Brevo
Full marketing and transactional email platform with a contact-based free tier, good campaign tooling, and broad integrations, though it charges by contacts rather than email volume.
User Reviews for Keplars
Product Hunt User
★★★★★
The setup is fast and the API is clean. Instead of fighting DNS records and waiting for domain review, you connect your Gmail account and you are sending in minutes. Every log, every delivery event is right there in the dashboard. It removes friction instead of adding it.
MakerStack Review
★★★★☆
For early-stage startups and indie developers sending under 25,000 emails per month, Keplars is a solid pick. The OAuth setup and sandbox testing genuinely save time compared to configuring Postmark or Resend from scratch. For higher volumes the per-email cost structure gets less clear, so do the math before committing.
(Based on product analysis)
★★★★☆
Having transactional and marketing sends on the same platform is the part that surprised me most. My previous setup had Postmark for product emails and Mailchimp for campaigns, with separate billing and separate templates. Keplars consolidates both into one dashboard and one API key, which simplifies things considerably.
(Based on product analysis)
★★★★★
The sandbox environment is what sold me. I could test my onboarding sequences and OTP flows against real template logic without touching production inboxes or worrying about hitting rate limits during QA. Most email tools skip this entirely or put it behind a higher tier.
Here's what our community thinks about Keplars
Here's what people are asking about Keplars (FAQs)
Do I need a custom domain to start sending with Keplars?▼
No. Keplars supports OAuth-based sending through Gmail, Google Workspace, or Microsoft Outlook, which means you can start sending production emails without any DNS records, SMTP credentials, or domain warm-up period. Custom domain support with SPF, DKIM, and DMARC is available when you are ready to switch, and the same API integration carries over with no code changes required.
Does the lifetime deal include both transactional and marketing emails?▼
Yes. Keplars handles both from a single platform. Transactional sends (password resets, OTPs, order confirmations, alerts) go through the REST API or SMTP relay, while marketing campaigns are built and scheduled through the campaign interface. All tiers on the RocketHub LTD include access to both.
What happens if I need more than 100,000 emails per month on the top tier?▼
The highest LTD tier includes 100,000 emails per month. If you need more, Keplars support can add extra capacity on top of your existing plan without requiring a new purchase or voiding your lifetime deal. This is handled on a case-by-case basis through the support team rather than a self-serve add-on at the time of launch.
Can I integrate Keplars with no-code tools like n8n or Zapier?▼
Yes. Keplars connects with n8n, Zapier, Bubble, Firebase, and Vercel, among others. Sends can be triggered from these tools without needing to configure SMTP. The REST API and webhook support also mean that any tool capable of making standard HTTP calls can trigger emails from Keplars.
Can I upgrade or stack tiers after purchasing the lifetime deal?▼
At the time this deal launched, RocketHub does not support plan upgrades or stacking multiple codes after purchase. The recommendation from both Keplars and RocketHub is to select the tier that your current or near-future volume can grow into before completing checkout.
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