Scout Forge
Usability68Design70Speed88Security64Accessibility80Growth68

Cycling through all six. Tap any point to stop.

Measured on six things

Resend alternative: email API for developers and AI agents

Security

64

HTTPS with HSTS, SPF and DMARC, plus documented auth, idempotency and rate limits. Missing CSP, frame protection and Permissions-Policy; no SOC 2 or pen-test claim found.

Screenshots

1 / 1

About this app

AgentiSend is a transactional email API and Resend alternative for applications and AI agents: Resend-compatible requests over REST, a hosted MCP server, a send budget on every API key, a kill switch, and a Free plan of 5,000 emails a month with no card.

Key features

  • 1Resend-compatible REST API — point the Resend SDK's base URL at AgentiSend and keep your call sites.
  • 2Per-key send budgets (monthly/hourly/daily) plus a per-minute ceiling and an account-wide kill switch.
  • 3Approval queues, loop detection and a documented enforcement ladder for AI agents that send email.
  • 4Readable message log with 12 filterable statuses, delivery reasons and raw MIME per email.
  • 5Hosted MCP server and CLI for Claude Code, Cursor, Windsurf and other MCP clients.
  • 6Free plan: 5,000 emails/month, no card, no expiry, up to 170/day and 3 sending domains.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Backend developers at SaaS startups sending transactional email (Node, Python, Laravel, Go)

Pain points

Opague delivery logs, spam-folder landings, and per-email costs that balloon as the app scales

Primary needs

Drop-in Resend compatibility, a readable message log with delivery reasons, and predictable low pricing

Demographic

AI engineering teams deploying autonomous agents that send email on the user's behalf

Pain points

A stuck bot can fire thousands of emails before anyone notices, with no per-key spend cap

Primary needs

Per-key budgets, an approval queue, loop detection, and an account-wide kill switch

Demographic

Platform and DevEx teams managing email infrastructure for multiple internal senders

Pain points

Managing dozens of API keys with no isolation, and one bad sender tanking shared domain reputation

Primary needs

Per-sender limits, audit trails, idempotency on every write, and a documented enforcement policy

Demographic

Indie hackers and bootstrapped founders who need volume without monthly burn

Pain points

Free tiers expire or require a card, and monthly subscriptions eat into thin margins

Primary needs

A no-expiry free plan, lifetime pricing options, and a fast path to first send

Scout Review

Written by AI from measured evidence, scored out of 100.

AgentiSend is a transactional email API positioned as a Resend alternative with a twist: every API key carries a send budget, risky sends can wait in an approval queue, and one button pauses every sender. For teams deploying AI agents that send email on a user's behalf, that's a genuinely underserved need — Resend and Amazon SES give you an API and a bill, not a leash. The execution is uneven. Speed is excellent (Lighthouse mobile 100/100, LCP 1.1s), accessibility is near-clean at 97/100 with one contrast miss, and the docs are unusually deep for a product this young: 255 operations, 122 error codes, guides for SDKs, webhooks, domains, templates and Resend migration. Design has a strong visual identity but a broken hero demo and illegible screenshots. Security is table-stakes-plus: HTTPS, HSTS, SPF and DMARC, but no CSP, frame protection or published audit. The product is very early — the domain is months old — so the real test is whether the guardrail story converts into adoption.

Measure by measure

Usability

68

One clear hero action, Google sign-in, no-card free plan and a docs set covering quickstart, SDKs, webhooks and migration. Dense copy after the hero slows the path to proof.

Design

70

Confident violet display type, tight hierarchy and a monospace spec-sheet stats row give it a coherent developer-tool identity. Undercut by an empty hero demo panel and screenshots too small to read.

Speed

88

Lighthouse mobile 100/100 with LCP 1.1s, CLS 0.014 and TBT 8ms; desktop 97/100. A genuinely snappy marketing page with no lag complaints in the collected evidence.

Security

64

HTTPS with HSTS, SPF and DMARC, plus documented auth, idempotency and rate limits. Missing CSP, frame protection and Permissions-Policy; no SOC 2 or pen-test claim found.

Accessibility

80

Lighthouse accessibility 97/100 with a single contrast-ratio failure; responsive layout and keyboard-friendly controls. No published WCAG statement or multi-language support found.

Growth

68

Sharp wedge: Resend-compatible API plus per-key budgets, approvals and a kill switch for AI agents — a need incumbents don't address. Early (domain ~0.3 years) but the category has headroom.

Improvement areas

  • Hero demo renders as an empty black panel with a spinner — replace with a static or preloaded demo.
  • Product screenshots are scaled too small to read; enlarge or crop to the relevant console area.
  • No CSP, frame protection or Permissions-Policy; no published SOC 2, pen-test or security page.
  • Heavy repetition of 'Resend alternative' in copy clutters the message and buries the agent story.

Design & Usability

The homepage has a clear identity: heavy violet display type, a monospace stats row (255 API operations, 51 webhook types, 12 statuses) and a genuinely good 'your bot asked to send one email too many' section that tells the per-key budget story visually instead of as bullets. The problem is the hero demo renders as an empty black panel with a spinner, so the centerpiece is missing on first load, and the product screenshots are scaled so small the interface text is unreadable. Copy leans hard on 'Resend alternative' repetition. Usability is stronger: one obvious action (email field, Start free, Continue with Google), no-card reassurance, and a docs set covering quickstart, SDKs, webhooks, domains, templates and migration. Density climbs fast after the hero, though — several paragraph blocks before any visual proof.

Speed & Security

Speed is the standout: Lighthouse mobile 100/100 with LCP 1.1s, CLS 0.014 and TBT 8ms, desktop 97/100. The marketing page is light and snappy, and no lag complaints surfaced in the collected evidence. Security is competent but not exceptional: HTTPS enforced with HSTS, X-Content-Type-Options and Referrer-Policy set, SPF and DMARC published, and docs that spell out auth, the error envelope, idempotency, rate limits and request ids. What's missing is the hardening layer — no Content-Security-Policy, no frame protection, no Permissions-Policy, giving 8/12 on the header checklist. No SOC 2, ISO or pen-test claim appears in the collected evidence, which is normal for a product this young but keeps the score in the category-typical band rather than above it.

Accessibility & Growth

Accessibility scores 97/100 on Lighthouse with a single failing audit: insufficient background/foreground contrast. The layout is responsive, the tab bar and form controls are keyboard-friendly, and headings follow a sane order. There's no published WCAG conformance statement or multi-language support, so the score sits at the top of the automated band without claiming more than was verified. Growth is the interesting one. The idea is specific: a Resend-compatible transactional email API whose differentiator is guardrails for autonomous senders — per-key budgets, an approval queue, loop detection and an account-wide kill switch. That's a real, named problem (a stuck bot firing thousands of emails) that Resend and SES don't solve, aimed at AI engineering teams and platform teams with dozens of keys. Pricing undercuts Resend (5,000 free emails vs 3,000, 40% yearly discount, lifetime plans). The limit is that the wedge is copyable and the brand is brand new — domain registered 2026-08-05 — so distribution, not the idea, is the open question.

Conclusion

If you're wiring an AI agent to send email and you're nervous about what happens when it loops, AgentiSend is worth a free-tier test: 5,000 emails a month, no card, no expiry, and budgets on before the first send. If you just need cheap transactional email and don't care about per-key limits, Resend's ecosystem and React Email integration are still the safer default. The gap AgentiSend has to close is trust — fix the hero demo, publish a security page, and get a real customer story on the site. The idea is good enough to earn that work.

Suggestions for improvement

  • Fix the hero demo panel — it renders as an empty black box with a spinner, killing the first impression.
  • Scale up product screenshots so the console UI text is legible at page size.
  • Publish a security page: CSP, frame protection, and any audit or pen-test status.
  • Cut the repeated 'Resend alternative' phrasing and lead with the agent-guardrail story instead.
How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

AgentiSendResendAmazon SESAgentMail
Free tier5,000 emails/month, no card, no expiry, up to 170/day3,000 emails/month free tierNo free tier; pay-per-email from the first sendAgent inbox product; free tier not verified in collected evidence
Per-key send budgetsYes — monthly/hourly/daily budget plus per-minute ceiling on every keyNo per-key budgetsNo; you build rate limits and quotas yourselfFocus is agent inboxes, not guarded outbound budgets
Kill switch / pause all sendersYes — one button pauses every key at onceNo account-wide kill switchNo; requires custom IAM/policy workNot positioned as a kill switch for outbound sending
Resend SDK compatibilityYes — Resend SDK requests accepted unchanged via base URL swapNative (it is the origin SDK)No; AWS SDK and raw SMTP onlyNo Resend compatibility claimed
Approval queue for risky sendsYes — sends can wait for a person to approveNo approval queueNo; would require custom workflowAgent inbox with read/reply; approval queue not verified
Pricing entry pointFree $0; Starter $9/mo (or $5.40 yearly); lifetime plans availableFree tier then paid monthly plans; no yearly or lifetime optionPay-per-email, cheapest at scale but requires DIY setupAgent inbox pricing; not verified in collected evidence

Resend

The better-known transactional email API with a generous free tier and React Email integration — but no per-key budgets or kill switch for autonomous senders.

Amazon SES

AWS's raw email service: cheapest at scale but requires you to wire up permissions, DNS, and bounce handling yourself.

AgentMail

Gives AI agents their own inbox to read and reply from, rather than focusing on guarded outbound sending.

Comparing options? See AgentiSend alternatives, scored side by side

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