# Helo — An independent email API from former Postmark folks
Source: https://maarket.ai/developer-tools/helo
Last updated: 2026-10-05

## Helo at a glance
- Category: Developer Tools (https://maarket.ai/category/developer-tools)
- Best for: Startup
- Agent compatibility: Agent Ready
- Karma Points: 15
- Rank in category: #18
- Community: 0 use this, 0 recommend it, 0 all-time clicks
- Website: https://helohq.com
- Pricing: https://www.helohq.com/pricing
- X: Helo_Hq

## About Helo
An email API from former Postmark people, built for developers and platforms that send on behalf of their customers. Contains bad senders, lets customers send from their own domains and keeps stats, unsubscribes and credentials separate per tenant, with REST, SMTP and SDKs.

## Alternatives in Developer Tools
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| m'kay | 15 | https://maarket.ai/developer-tools/m-kay |
| Bitrise Build Hub | 15 | https://maarket.ai/developer-tools/bitrise-build-hub |
| gg-friggin-ez | 11 | https://maarket.ai/developer-tools/gg-friggin-ez |
| 99tests | 10 | https://maarket.ai/developer-tools/99tests |
| Hyrax AI | 10 | https://maarket.ai/developer-tools/hyrax-ai |
| DEV·TV | 10 | https://maarket.ai/developer-tools/dev-tv |
| Autonomous Product Delivery (AutonomyAI) | 10 | https://maarket.ai/developer-tools/autonomous-product-delivery-autonomyai |
| Jev State | 10 | https://maarket.ai/developer-tools/jev-state |
| CodeSpotlight | 10 | https://maarket.ai/developer-tools/codespotlight |
| Vitals | 10 | https://maarket.ai/developer-tools/vitals |
| Wu | 10 | https://maarket.ai/developer-tools/wu |
| slop-grader | 10 | https://maarket.ai/developer-tools/slop-grader |
| deb.griffo.io | 9 | https://maarket.ai/developer-tools/deb-griffo-io |
| Fulvid | 5 | https://maarket.ai/developer-tools/fulvid |

## Frequently asked questions

### Who is Helo built for?
Developers and platforms that send on behalf of their own customers, rather than a single company sending only its own mail.

### How does multi-tenant sending work?
Customers send from their own domains, and stats, unsubscribes and credentials are kept separate per tenant, so one account's data never mixes with another's.

### What stops a bad customer ruining delivery?
It is built to contain bad senders, which is the purpose of that per-tenant separation: one abusive tenant should not drag the rest down.

### How do I integrate it?
REST and SMTP are both offered, plus SDKs, so you can move an existing SMTP integration across or build against the API.

### Is Helo agent ready?
Yes — Helo is listed as Agent Ready on Maarket.

### Who is Helo best for?
Helo is listed as a fit for Startup teams.

### What does Helo do?
An independent email API from former Postmark folks

### What are the alternatives to Helo?
Other Developer Tools products on Maarket include 99tests, Claude Code, Supabase, GitHub Copilot, Postman, Cursor.

### How is Helo ranked on Maarket?
Purely by Karma Points earned from community actions — reviews, recommends, use signals and clicks. There is no pay-to-rank; sponsor placements are always clearly labeled.