No moat. Still in business.

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Excel add-in for querying tables with SQL, scripting workbooks in C# and building custom Excel functions.

Since 2016

Free plan · Data and spreadsheets · Developers

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Fires webhooks once or on a cron schedule in your timezone and alerts you when a call fails.

Since 2019

Free plan · Developer tools · Developers

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Posts a Slack alert when Apple or Google approves or rejects your app, or a TestFlight build is ready.

Since 2023

Subscription · Uptime and monitoring · Developers

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Send your own HTML form to a hosted endpoint that stores entries, holds back spam and forwards them to email or other tools.

Forms and surveys · Agencies

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A small headless CMS for writing and publishing blog posts and media, pulled into your site by API.

Free plan · Website builders · Creators and writers

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An API that renders HTML and saved templates into PDFs and screenshots, for developers who need documents from their apps.

Pay as you go · Documents and e-signature · Developers

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An email API that developers use to receive mail on their own domain as JSON, route it and reply in the same thread.

Since 2025

Subscription · Transactional email · Developers

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Creates and checks llms.txt files so AI coding assistants can read your docs, and refreshes them when the site changes.

Since 2025

Free plan · SEO · Developers

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An API that takes videos your users upload, converts them to web-ready formats and serves them from a CDN.

Free plan · Video and audio · Developers

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A Chrome extension that gives you a webhook URL, so automation tools can open links as new tabs in your browser.

Since 2026

Automation and integrations · Developers

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A hosted service that sends your app's webhooks with retries, logs and debugging so developers need not build it.

Free plan · Developer tools · Developers

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Connect email accounts and get messages sent to your webhooks, with an API for replies and content analysis.

Since 2023

Free trial · Developer tools · Developers

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Sends webhooks from your app to customers with retries, signatures and logs, hosted in the EU or run on your own servers.

Free plan · Developer tools · Developers

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Sends messages from your scripts, servers or webhooks straight to the Pocket Alert app on your iPhone or Android phone.

Since 2024

Free plan · Uptime and monitoring · Developers

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A free personal URL that emails you when a script, cron job or build calls it, for developers who want simple alerts.

Free · Uptime and monitoring · Developers

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A light self-hosted Git server with a web interface that runs as one binary or Docker container on small machines.

Free · Developer tools · Developers

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Lets app and game developers change settings and run A/B tests remotely, without shipping a new build or waiting for store review.

Since 2024

Developer tools · Developers

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Hosted service that receives, logs and retries webhooks, with a CLI for local testing and a typed SDK.

Since 2024

Developer tools · Developers

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Receives incoming email and passes each message to your app as a signed HTTP POST, so there's no need to run a mail server.

Free · Developer tools · Developers

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A form backend for developers that adds front-end validation, autoresponders and spam blocking, with a HIPAA option.

Free trial · Forms and surveys · Health and clinics

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A cloud workspace for creating, running and sharing marimo Python and SQL notebooks for data work

Since 2024

Developer tools · Developers

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Gives static website forms a hosted endpoint that stores submissions, filters spam and sends alerts to email, Slack or Discord.

Forms and surveys · Developers

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Hosted backend that takes in webhooks from Stripe, Shopify and others, stores them and runs your code with queues, cron and retries.

Since 2024

Free plan · Developer tools · Developers

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An API that gives AI agents their own email inboxes to send and receive mail, with webhooks and scanning for prompt injection.

Since 2026

Free plan · Transactional email · Developers

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An API and MCP server that lets AI agents send contracts and collect two-party signatures by email.

Since 2026

Free plan · Documents and e-signature · Developers

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One MCP server that gives AI agents hundreds of sourced data streams like weather, markets and releases, with full history.

Since 2026

Developer tools · Developers

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Gives you one fixed webhook URL that forwards Stripe and Paddle events to whichever branch deployment you are testing.

Since 2026

Free plan · Developer tools · Developers

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API and dashboard that let developers send and receive WhatsApp messages from their own product.

Since 2025

Free plan · Developer tools · Developers

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Gives AI agents their own email addresses and inboxes through an API, hosted in the EU, for developers building agents.

Since 2026

Free plan · Transactional email · Developers

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Receives webhooks from providers like Stripe, then verifies, stores and forwards them to your services with retries.

Free plan · Developer tools · Developers

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Gives each AI agent a real email address, and soon a phone number, so it can read mail, reply and use login codes.

Since 2026

Free plan · Developer tools · Developers

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A form endpoint for React, Vue or plain HTML sites that stores submissions, blocks spam and emails or forwards each one.

Free plan · Forms and surveys · Developers

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Gives an HTML contact form an endpoint that filters spam and emails submissions, for static site owners and developers.

Free plan · Forms and surveys · Developers

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A Mac terminal manager for developers running several coding agents, showing which session is waiting for input.

Since 2026

Developer tools · Developers

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Uptime checks you set up through an API, a GitHub Action or an AI agent, with alerts when a site goes down.

Since 2026

Free plan · Uptime and monitoring · Developers

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Sits in front of your server to receive webhooks from Stripe, Shopify and others, logging each one so missed events can be resent.

Free plan · Developer tools · Developers

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Opens a public HTTPS address to a server on your own machine, so developers can test webhooks and bots.

Since 2025

Free plan · Developer tools · Developers

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An email sending API for developers that shows every message's path from queue to delivery, bounce or open.

Free plan · Transactional email · Developers

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Paste one endpoint into an HTML form to get spam filtering, stored submissions, email alerts and routing to other tools.

Free plan · Forms and surveys · Developers

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Dashboard for email sent through Amazon SES showing bounces, deliveries, complaints, opens and clicks, run yourself or hosted.

Free · Transactional email · Developers

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Hosted service that sends webhooks for software teams, with retries, dead letter queues and delivery logs.

Since 2025

Free plan · Developer tools · Developers

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A hosted endpoint in front of your API that queues requests, retries failed deliveries and keeps a searchable log.

Since 2026

Free plan · Developer tools · Developers

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Point any domain at any URL with automatic HTTPS, path rules and hit analytics, no server to run.

Free plan · Website builders

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Send app events with one HTTP call, then search them and get them delivered to Slack, Discord, Telegram or webhooks.

Since 2026

Free plan · Developer tools · Developers

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Trigger webhooks and HTTP calls from Apple Watch faces, widgets and Siri, and see the response code.

Since 2025

Developer tools · Developers

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Deploys apps from a GitHub repo onto a server in your own cloud account, with HTTPS and redeploys on each push.

Since 2026

Free plan · Developer tools · Developers

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WordPress plugin that fetches JSON, XML or CSV from an API and shows it on your site through templates.

Free plan · Website builders

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An API that adds open and click tracking to emails from any provider and sends the events to your app by webhook.

Since 2026

Free plan · Transactional email · Developers