Curated Technology Directory • Verified Free-Tier Boundaries

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

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APIs & Platforms

External APIs, developer SDKs & integration infrastructure

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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.

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Stripe

APIs & Platforms

Paid

Financial infrastructure and payment processing APIs for the internet economy.

Free Tier Allowance Verified: February 2026

No monthly subscription fee; pure transaction-based pricing (2.9% + 30¢ per successful card charge). Free test sandbox is unlimited.

Stripe Checkout and Elements for drop-in, PCI-compliant payment UI. Stripe Billing engine supporting proration, usage meters, and coupons.

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