Keplars
Transactional and Marketing Emails Platform
You’ve got emails to send. 📨 Your setup is fighting you. ⏳ ❌
Every day you lose hours wrestling with SMTP setup, DNS records, and app passwords just to get one email out.
And you still don’t know if it landed.
Keplars gets it and enables you to skip all that. Just connect Gmail or Outlook and start sending in minutes.
Get set up in under 5 clicks, then send every email with 99.77% inbox delivery and sub-5-second speed.
Watch each email go from sent to opened to clicked, live.
Plugs into what you already use such as Firebase, Vercel, n8n, and Zapier.
Rated 5.0 on G2 and trusted by Supabase, GitStart, and 1,000+ product teams.
Key Features
Transactional Email Campaigns
Send registration, password resets, confirmations, & alerts via REST API, SMTP, webhooks, and SDKs.
Marketing Email Campaigns
Design, schedule, and send campaigns at scale.
Unified Email Editor
Drag-and-drop or code within the built-in editor or import Canva and Figma designs as templates.
Real-Time Delivery Tracking
Watch every email from sent to opened while seeing delivery, bounces, and engagement instantly.
Mailbox Warmups
Build sender trust by slowly raising volume and creating natural engagement over time.
100+ Native Integrations
Connect Keplars to your CRMs, e-commerce tools, and dev stack in minutes.
Overview
One platform for all your transactional and marketing emails with reliable inbox delivery. Setup in under 5 clicks.
Getting started with Keplars is easy.
1. Connect an email account & verify your domain: Link your gmail or outlook via OAuth. Keplars sends on your behalf with no passwords stored. Verify your domain, next.
2. Connect and go: No SMTP relay, no DNS records, no app passwords. An OAuth connection handles all of it and DKIM, SPF, and DMARC are all configured automatically.
3. Import your contacts: Start adding audiences in your account by importing them or creating them 1 by 1.
4. Start creating campaigns: Pick an audience, choose a template, then send now or schedule. Track opens, clicks & bounces per recipient.
Switching from SendGrid, Postmark, or Resend?
Import your templates and move over with minimal setup. Same sending power without the SMTP config or per-contact fees.
Why Choose Keplars
Emails actually land: Password resets and receipts reach the inbox, not the spam folder. No more locked-out users.
- Launch in an afternoon: Skip the SMTP and DNS setup. What used to take two days is done before lunch.
- Grow without penalty: You pay for what you send not how big your list is.
- Test without risk: Run new templates, flows, and client campaigns in a sandbox before they touch a real inbox, critical if you’re managing sends for multiple clients or products.
Email that just works: Strong uptime and failover keep your invoices and alerts going out.
Fix issues fast: See exactly where an email stalled instead of digging through logs across tools.
Who Needs Keplars
- Startup founder / indie hacker: Set up resets, welcomes, and receipts fast. Add campaigns as you grow.
- Digital agency / dev shop: Manage email for every client. Set up isolated sending per client and onboard in minutes.
- Email marketer: Run campaigns that reach the inbox. Schedule broadcasts and track opens and clicks without per-contact fees.
- Automation / no-code builder: Add email to your workflows. Trigger sends from n8n, Zapier, or Bubble. No SMTP needed.
Product / backend developer: Trigger sends from Next.js, Firebase, or edge functions with full visibility.
Platform / marketplace operator: Run internal sends and let users send from their own accounts in one setup.
Lock in lifetime access before this deal closes, no monthly fees, no per-contact pricing, ever.
Demo: See it in Action👇
Plans & Features
Deal Terms
- Lifetime access to Keplars
- All future LTD Plan updates that map to your plan
- You must activate your license within 60 days from the purchase date. RocketHub has no recourse or influence thereafter nor will engage on your behalf. You will need to work directly with the third party partner and its their sole decision to honor the license though they’re under no obligation. To avoid this loss, please redeem the license.
- 30-day money-back guarantee, no matter the reason. No exceptions thereafter
Features Included in All Plans
- Campaigns
- Email Scheduling
- Webhooks
- Unlimited API/SMTP
Tier 1 - RH Orbit
Maps to Orbit Plan-
All features above included
-
10k Email sends/month
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1k Contacts
-
1 User
-
5 Email Accounts
-
10 AI Credits for templates (one-time)
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1 Custom Domain
Tier 2 - RH Launch
Maps to Launch Plan-
All features above included
-
40k Email sends/month
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30k Contacts
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5 Users
-
10 Email Accounts
-
20 AI Credits for templates (one-time)
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5 Custom Domains
Tier 3 - RH Agency
Maps to Launch Plan-
All features above included
-
100k Email sends/month
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100k Contacts
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10 Users
-
20 Email Accounts
-
30 AI Credits for templates (one-time)
-
10 Custom Domains
Frequently Asked Questions
Keplars infrastructure is hosted across Leaseweb data centers, Amazon Web Services (AWS), and SUMMIT to provide a balance of performance, reliability, and global availability. We use multiple layers of infrastructure redundancy and security practices to ensure consistent service delivery.
Keplars supports both transactional and marketing emails – OTPs, password resets, alerts, onboarding flows, product notifications, and subscriber campaigns.
Spam, phishing, malicious content, and emails violating CAN-SPAM or GDPR are not allowed. Transactional, marketing, and cold outreach are all supported as long as your practices remain compliant.
Keplars enforces a fair use policy and maintains its right to remove users for abuse, non-compliant use, or sending prohibited campaigns. Absolutely no refunds for such cases. Be good.
Connect via Google Workspace, Microsoft Outlook, or a custom domain. Integrate using API, SMTP, Webhook, or custom domain – generate credentials from the dashboard and start sending in minutes.
Keplars routes through Gmail, Google Workspace, and Microsoft Outlook infrastructure so dedicated IPs are not applicable. This ensures strong deliverability backed by their sender reputation.
No. Transactional and marketing traffic are separated. OTPs and critical emails are always prioritised and routed independently.
After purchasing you will get a unique redemption code within your Order Confirmation email. It will also contain Redemption Instructions. Simply follow the instructions to redeem your purchase.
Here’s an example Order screenshot for where to look.
REFUNDS – RocketHub offers a simple 30-day money-back guarantee from the date of purchase.
You can request a refund by:
a) Submitting a request from your My Account dashboard, or
b) Emailing [email protected] with your order details and product to refund.
Note the following:
- Refunds are typically processed within a few business days.
- Requests submitted AFTER the 30-day window are NOT eligible for a refund.
- Refunds may be declined in cases of abuse, excessive usage, or violation of our terms.
- Duplicate or accidental purchases are eligible for refund within the 30-day window.
SUPPORT – RocketHub is a marketplace and does not operate or manage the products sold.
- Product support (setup, bugs, features, usage) is handled directly by the deal partner at all times.
- Billing and refund inquiries should be directed to RocketHub.
After the refund window, all product-related questions must be directed to and handled by the deal partner. RocketHub does not provide ongoing product support or act as an intermediary.
A) Included Features
Features available at the time of purchase are included in your plan. Future features are generally included as long as they do not introduce significant ongoing costs (such as per-use, AI LLM, 3rd party API, infrastructure, or bandwidth expenses).
B) AI, Credits & Variable Costs
This product uses third-party AI models (text, image, and/or video), and costs may vary over time. Credit usage and generation limits may be adjusted based on underlying provider pricing, which is outside the partner’s control. Current credit usage is outlined in the plans and/or FAQ at the time of purchase.
C) Paid Add-ons
If new features introduce meaningful ongoing costs, partners may offer them as optional paid add-ons (one-time or recurring), often at discounted rates for lifetime deal customers. This helps ensure long-term sustainability of the product.
D) Plan Mapping & Changes
Lifetime deal plans are based on the partner’s current plan structure at the time of purchase. Partners may update plan names, pricing, or limits over time. Your LTD will continue to reflect the value and limits defined at purchase, but does not guarantee access to all future highest-tier offerings.
E) Feature Changes or Removal
Products evolve. Features may be improved, replaced, or removed entirely based on business needs. If a feature is removed, it will be removed for all users (not just LTD holders). Previously included features will not be converted into paid add-ons unless they are fundamentally reworked or replaced.
F) Fair Use & Limits
All plans are subject to reasonable usage limits to prevent abuse and ensure platform stability. This may include rate limits, throttling, or other safeguards.
G) Third-Party Integrations
Integrations and external services depend on third-party providers. Changes to those providers (pricing, APIs, or availability) may impact or remove certain integrations.
H) Long-Term Availability
Lifetime deals provide access for the lifetime of the product, not a guaranteed duration. If the company is acquired, pivots significantly, or shuts down, services may be discontinued.
Final Note to Buyers
We encourage you to make your purchase decision based on the product’s current capabilities and assume the roadmap, if any, is a possibility not a guarantee. If you have questions, please ask before purchasing.
At the time this deal was launched, RocketHub does not support changing or upgrading your plan after purchase. LTD’s purchased via RocketHub also currently doesn’t support combining or stacking purchase codes. We recommend purchasing the tier that your business can grow into.
Founder Details
Quick Information
Founded: January 2026
Headquarters: Delaware, USA
Company Size: 1–10 employees
Product Stage: Startup
Financial Stage: Bootstrapped
Quick Links
Letter From the Founder
Hey Rocketeers 👋,
Keplars started with a simple belief: email infrastructure should help you grow your business, not slow it down.
We saw founders and developers spend too much time dealing with DNS records, deliverability issues, fragmented tools, and complex setups. Something as fundamental as sending an email had become unnecessarily difficult.
So we built Keplars.
Whether you’re launching your first product, building your next startup, or scaling to millions of emails, we want Keplars to grow with you.
From your first email to your millionth, we’re here to simplify the journey and provide the infrastructure you need along the way.
Our mission is to become the communication infrastructure platform that founders start with, developers love, and enterprises trust.
Thank you for being part of this journey. We’re excited to grow together.
Deb and Ananya
Founders, Keplars
Company Updates and FAQs
2026 – Delaware, USA
– Pullgenius AI for codebase scan and PR reviewer.
– InsightOps for engineering team work stats and performance metrics.
– SWING Technologies is a software development agency.
– Started my journey from Mobile Engineer to Engineering Manager at YC Company.
The idea for Keplars came from our own experience building software products and startups. We repeatedly faced the same challenge: email infrastructure was far more complex than it should be. Setting up DNS records, managing deliverability, switching between multiple tools, and debugging issues consumed valuable development time. We realized that sending emails should be as simple as connecting an account and making an API call. That frustration led us to build Keplars.
Keplars simplifies email infrastructure for developers and businesses. Traditional email platforms often require complex setup, custom domains, multiple tools, and technical expertise. Keplars allows users to start sending emails in minutes through OAuth, even without a custom domain. We unify transactional emails, marketing campaigns, automations, real-time tracking, mailbox warmup, APIs, SMTP, and a visual-plus-code email editor into a single platform, making email simple from day one and scalable as businesses grow.
Lifetime Deal
1 review for Keplars
01 Customer(s) recommended this item
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A true replaceemnt for resend
An actual email sending API with warm up and deliverability reporting. Nothing else offers email infrastructure at this level a true replacement for Resend. Great for developers to integrate.
August 20, 2026
Only logged in customers who have purchased this product may leave a review.
Got a Question? Ask here.
Can this integrate with ConvertBox? For email pop up forms. Does this have email automation and workflows? Can this tool work for bloggers?
Hi Jeaneane, thanks for asking!
No native ConvertBox integration yet, but you can connect them through webhooks or our API, so a form submission in ConvertBox can trigger an email or add a contact in Keplars.
You can also just use SMTP if you’d rather not touch the API.
Yes, we have automations: build multi-step workflows in the dashboard (welcome series, post-purchase follow-ups, re-engagement) with triggers, delays, and conditions, then drive them from your app via API.
– https://docs.keplars.com/docs/marketing
– https://docs.keplars.com/api-reference
And yes, it works well for bloggers. You get audiences/contact lists for newsletters plus transactional sending, all from one platform.
Happy to help with anything else!
Do Keplars have a built-in SMTP? Do I have to connect Amazon SES?
Hi Jeaneane, yes, Keplars has built-in SMTP. No need to connect Amazon SES or any external provider. You get SMTP credentials (host: smtp.keplars.com) that work with any standard SMTP library like Nodemailer or PHPMailer.
Docs: https://docs.keplars.com/docs/getting-started/setup-smtp-keys
Hi! Just so I understand, from your answer bellow about SMTP: which infrastructure is effectively sending the emails? Is Keplars just a layer over our own GMail / Outlook, or you actually send the emails, and we can optionally configure our Gmail / Outlook to use Keplars for mail sending?
Another question: do these plans include API access?
Thanks a lot! If Keplars does the sending and we get API, this is a must-buy!
Hi Alban, good question!
Keplars connects to your Gmail or Outlook via OAuth and actually sends through that account, so your sender reputation stays yours. It’s not a separate mail server layer, and there’s no need to configure your Gmail/Outlook to use Keplars separately since that connection is the sending method. You can also verify a custom domain to send from, if you’d rather not send through Gmail/Outlook directly.
Brief Doc: https://docs.keplars.com/docs
And yes, all tiers include unlimited API and SMTP access, so API is included no matter which plan you go with.
Hello Keplars team, if I choose the custom domain option, do I still get 100k emails on the highest plan? If I need to send more than 100k emails, how does that work? Are there addons, or would I need to buy another plan? Would purchasing an additional plan increase my limits or void the LTD? Thanks!
Hi Damien, yes, the 100k email limit on the highest plan is the same whether you send through OAuth or a verified custom domain, it’s not a separate allowance.
If you need more than 100k, reach out to support and we’ll add extra capacity on top, no need to buy another plan, and it won’t void your LTD.
99.77% inbox delivery is a very specific number. How did you measure it?
Hi Sanjeet, fair question.
We consistently see delivery above 99%, and it can hit 100% when the sending domain’s reputation is solid. We haven’t run this through a formal benchmarking tool yet, but that’s something we’d love to add.
I have the following concerns regarding your product and company:
1. Lack of transparency regarding the legal entity
I reviewed your Terms of Service, Privacy Policy, and Contact page, but I could not find the following information clearly disclosed:
* Full registered legal entity name
* Company registration number
* Registered business address
* Country of incorporation
* Governing law and jurisdiction for disputes
* Legal identity of the GDPR data controller
The documents refer only to the brand name “Keplars Mail Service.” This level of disclosure is insufficient for a service that processes contact information and email content and requests OAuth permissions.
2. No completed independent security certification
Your official documentation confirms that:
* Keplars has not yet obtained SOC 2 certification.
* Its GDPR readiness review is still in progress.
* Its SOC 2 Type I audit is still marked as “In Progress.”
* The service is not intended for sensitive or regulated data.
Although the Keplars Trust Center states that the platform uses TLS, encryption at rest, backups, and security monitoring, these are currently self-reported claims. No publicly available independent audit report has been provided to verify them.
Hi Will, thanks for the detailed writeup, appreciate it.
Entity disclosure: fair catch. Keplars currently operates under our US parent, ArcticByt LLC, and we’ve started incorporating Keplars as its own separate US entity. On the India side, Keplars is a registered Private Limited company with an active CIN and GST registration. Can’t post registration numbers in a public thread, but happy to share details directly, feel free to reach out and we’ll set up a chat. We’ll also get the entity name, jurisdiction, and GDPR data controller added explicitly to the ToS, Privacy Policy, and Contact/Legal page.
Certifications: everything in our Trust Center is accurate. We haven’t completed SOC 2 Type I or a formal GDPR audit yet, both are in progress. TLS, encryption at rest, backups, and monitoring are live today, but until audited, that’s self-reported, not verified, and we’ll make that distinction clearer on the page.
If you’re handling sensitive or regulated data, hold off until the audits land. For general transactional/marketing email, the infra’s solid, but you should make that call with accurate info.
Appreciate you flagging this.
Does Keplars Tier 1 send SMTP/API email through Keplars’ own transactional-mail infrastructure and authenticated custom domain, or does every SMTP/API send relay through my connected Gmail or Outlook account and count against that provider’s sending limits?
Hi Ali,
Good question, here’s how the routing actually works:
It’s not tied to your tier, it comes down to which credentials you generate. If you generate SMTP/API credentials against an OAuth connection (Gmail, Google Workspace, or Outlook), Keplars sends through that connected account directly, no separate mail server layer in between, so it counts against that provider’s own daily limits (Gmail: 500/day, Google Workspace: 2,000/day), and your sender reputation stays tied to your own inbox.
If instead you generate credentials against a verified custom domain, sends go out through Keplars own transactional infrastructure with full SPF/DKIM/DMARC authentication on your domain, no Gmail/Outlook involved, and none of those provider caps apply.
We don’t restrict this by tier or plan, it’s simply whichever credentials you choose to generate and use.
Let me know if you have more questions.
Best,
Deb