Keplars email infrastructure, $1.8K MRR: one platform for every email

Keplars provides transactional and marketing email infrastructure with delivery visibility, testing, integrations, and a visual editor. Its $1.8K MRR is verified through the payment provider's API by TrustMRR (Stripe), as of September 30, 2026.

What it actually sells

Keplars sells transactional and marketing email infrastructure for developers and product teams. It includes delivery visibility, sandbox testing, and support for sending transactional and marketing emails through one platform.

Its editor supports drag-and-drop design, raw code, and imports from Canva and Figma. Delivery tracking covers opens, clicks, bounces, delivery status, and engagement metrics.

How it charges

The Pulse plan includes 5,000 emails per month for $1/month, billed monthly. The plan covers transactional emails, and the site presents it as one entry point into Keplars email infrastructure.

Month by month

Monthly revenue as read from the payment provider by TrustMRR, in US dollars, as of September 30, 2026.

Month	Revenue (USD)
2026-01	$30
2026-02	$131
2026-03	$50
2026-04	$117
2026-05	$56
2026-06	$99
2026-07	$90
2026-08	$204
2026-09	$313

Where customers come from

Keplars provides comprehensive documentation, examples, quick-start guides, and a migration guide for existing email providers. The site also supports automated email sends across 5,000+ Zapier-connected apps and lists 100+ native integrations.

The founder lists Product Hunt, Word of mouth, Discord, Partnerships, Cold DM, LinkedIn, and X / Twitter as growth channels.

What stands out

Keplars combines transactional APIs and full marketing campaigns in one platform. Developers can integrate through REST APIs, SMTP, webhooks, OAuth, and SDKs for their favorite programming languages.

The site lists a 99.99% uptime SLA with multi-region failover, a 99.77% global inbox deliverability rate, and an average global inbox delivery time under 5 seconds.

From the official site

One platform for every email use case, from transactional APIs to full marketing campaigns.

Excerpts from the official website, fetched October 1, 2026.

Where it sits in the data

Keplars's $1.8K MRR is higher than 81% of the 5,602 projects with payment-verified revenue in our dataset; the median across them is $150. Within the “Dev Tools” category (717 projects) it is higher than 84% (category median $100). Snapshot: 2026-09-02 to 2026-09-30. The dataset only covers founders who chose to publish their numbers, so it leans toward businesses that work; use it for scale, not as an average.

Currency

All figures are in US dollars as published. A rough yuan or euro conversion is not applied here because prices, taxes and acquisition costs differ by country.

Could you build something like this?

My view is that this needs real work. Buyers would be developers, startups, product teams, and growing businesses that need transactional email, marketing campaigns, delivery visibility, testing, and integrations. Distribution would need to come through developer documentation, migration guides, integrations, developer communities, direct outreach, partnerships, and launch platforms.

The difficult parts are email deliverability, uptime, integrations, migration support, and the ongoing support load. Email infrastructure also operates in a competitive developer-tool market, where reliability and compatibility are central purchase requirements.

Verdict: Needs real work.

One thing to take from it

My view is that Keplars shows a product-led infrastructure business built around a broad integration surface, entry pricing, migration support, and developer-facing distribution. The clearest lesson is to package technical infrastructure around the workflows its buyers already use.

Sources

Keplars official website, fetched October 1, 2026
Keplars pricing page, fetched October 1, 2026
Keplars about page, fetched October 1, 2026
TrustMRR: revenue verified through the payment provider's API by TrustMRR (Stripe), as of September 30, 2026

Revenue, team and start-cost figures are what the founder reported at the interview date, not current figures and not a prediction of what you will earn. Product and pricing facts come from the business's own website as checked on 30 September 2026. Method & sources · Disclosure