Buffer vs Resend
Both are marketing tools. Here is what separates them.
What Buffer is
Buffer is a social media scheduling tool. Posts are written once, dropped into a queue for each connected channel and published on a schedule. It supports Bluesky, Facebook, Google Business Profile, Instagram, LinkedIn, Mastodon, Pinterest, Threads, TikTok, X and YouTube, and runs as a web app, a mobile app and a browser extension. The product is divided into Publish, Create, Community, Insights, Collaborate, Start Page, AI Assistant and API. Pricing is charged per connected social channel rather than per account, and that single decision determines whether Buffer is cheap or expensive for a given team. Essentials is listed at $5 per month per channel and Team at $10 per month per channel with unlimited team members included, so a five-person team posting to three channels pays less than one person posting to eight. Channels 1 to 10 are charged at the standard rate and each channel beyond the tenth costs less, which softens the curve for anyone managing a large roster. The Free plan costs $0, is described as free forever, is for a single user and connects three channels, with a cap of 10 scheduled posts per channel at a time. Paid plans lift that cap to unlimited scheduled posts per channel and add API access, the AI Assistant and unlimited saved ideas. They come with a 14 day free trial. Core analytics are free rather than held back for paying customers. Insights reports reach, engagement, follower changes and top-performing content, compares channels side by side and tracks trends over time. Every metric carries its own definition and a stated refresh frequency, which is useful when a figure disagrees with the native platform and someone has to explain why. Takeaways are AI-generated summaries of performance with suggested actions. Paid plans extend how far back the analytics history goes and add PDF and CSV exports for reporting outside the tool. Start Page is Buffer's link-in-bio page builder, available on the free plan with some feature limits alongside the three connected channels. Its appearance is set with themes, colours, fonts and layouts, and pages can embed videos, products, photos and forms without code. Built-in analytics show which links are getting the most clicks, so the page can be judged on the same terms as the posts pointing at it.
What Resend is
Resend is a service for building, testing and sending email from an application. It covers transactional messages, the ones triggered by something a user does, and marketing campaigns, which it calls Broadcasts. It is built for developers: sending anything at all requires a Resend API key and a domain you have verified yourself. The free plan covers 3,000 emails a month across three verified domains, along with 10,000 automation runs. Pro is $20 a month for 50,000 emails and ten domains. Scale is $90 a month for 100,000 emails and up to a thousand domains. Emails past the allowance cost $0.90 per thousand on Pro and Scale, and automation runs past the free allowance cost $0.0015 each. Scale customers sending more than 3,000 emails a day can add a dedicated IP for $30 a month. Enterprise terms are set to fit. Most of what the dashboard does is also reachable through the API. Broadcasts can be created and sent in one request, and cancelled again while scheduled or queued. Webhooks can be created, retrieved, listed and deleted programmatically, and every email webhook and GET email endpoint returns the Message-ID. Contacts import from a single CSV upload running to millions of rows. Suppressed addresses are managed from the dashboard or the API, request logs are available from anywhere, and sending statistics break down in more detail. API keys carry separate permissions, and a key exposed in public code is detected, revoked and reported to the team automatically. There is a CLI for the terminal, SDKs for several languages including an official PHP one, and support for custom headers. The template side deals with the awkward parts of email HTML. The code editor flags pasted markup that email clients will not render correctly. Templates can be organised into folders, charts can be embedded in a message, links can be turned into rich Open Graph previews, and AI prompts can reference existing content across broadcasts, templates and automations. Resend runs a hosted MCP server with OAuth built in, supporting OAuth 2.1 with PKCE, Client ID Metadata documents, an official HTTP transport and the Agent Plugins Standard. It connects to Claude in one click from the connector directory, and the MCP server and Resend skills install from the Codex plugin marketplace. Auth0 transactional email can be routed through it with an official integration, and sign-up works from inside Vercel or the Vercel CLI. A domain in use by another Resend team can be verified and transferred. The project began as open source in 2022, joined Y Combinator's winter 2023 batch and launched the sending platform that year.
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