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FroznLabs
Curated Technology Directory • Verified Free-Tier Boundaries

Tools & Resources Directory

Benchmarked directory of essential software, developer APIs, databases, and cloud infrastructure. We independently audit pricing, free-tier thresholds, and alternative ecosystems.

Free Tier Transparency: We audit exact numerical thresholds. Free trials are strictly separated from permanent free tiers.
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APIs & Platforms

External APIs, developer SDKs & integration infrastructure

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Resend email delivery API logo
APIs & Platforms
Freemium

Developer-first email delivery API built with modern React Email components.

Free Tier Allowance Verified: February 2026

3,000 emails/month free, capped at 100 emails/day; includes custom domain DKIM/SPF verification with zero credit card.

First-class React Email SDK for building emails as typed React code. High inbox deliverability with automated DNS records validation.