Choose Resend if you’re a developer looking to integrate transactional email capabilities directly into your SaaS application. Its developer-focused API and strong deliverability features make it an excellent fit for those who need reliable email without the fuss of traditional marketing tools. However, avoid it if you're a marketer seeking advanced campaign management or a non-technical user looking for a straightforward interface.
On the other hand, opt for tldraw if you’re part of a product team or a developer aiming to create custom canvas applications. Its infinite canvas and real-time collaboration features are perfect for prototyping and brainstorming. However, if you require a fully open-source solution or just need a simple free sketching tool, you might want to look elsewhere.