nomoat / API Substack / Alternatives
Alternatives to API Substack
API Substack: An unofficial API, CLI and MCP server that lets Substack writers draft, schedule and publish posts outside the editor. Here are 12 other products that do a similar job. Of these, 10 have a free plan.
- Composio
Gives AI assistants and agents authenticated access to over 1,500 apps so they can take actions, with a managed MCP gateway.
Pay as you go · Developer tools · Developers
- Opposable
Lets Claude, Codex or other AI agents tap, type and read the screen on your iPhone or Android phone, or on a rented cloud phone.
Free plan · Developer tools · Individuals and families
- Parley
Lets a team's AI coding agents pass work to each other over MCP and pings a person in Slack when stuck.
Free plan · Developer tools · Developers
- Velane
Hosts agents, small APIs and internal tools with sandboxes, secrets, environments and many app connections, run from your editor.
Free plan · Developer tools · Developers
- Activepieces
Builds automated workflows and AI agents that connect hundreds of apps, as a hosted service or on your own servers.
Free plan · Automation and integrations
- DocuQueue
API and MCP server that turns your data into branded PDFs such as invoices, contracts and offer letters.
Free plan · Documents and e-signature
- dassi
A browser extension you teach a repeated web task once, which then runs it on a schedule using the sites you are logged into.
Subscription · Automation and integrations
- EventSend
Send app events with one HTTP call, then search them and get them delivered to Slack, Discord, Telegram or webhooks.
Free plan · Developer tools · Developers
- Loopthink
Connects Claude and ChatGPT to tools like Search Console, Google Ads and your own APIs, with per-person logins and call logs.
Free plan · Automation and integrations
- Lumbox
Gives each AI agent a real email address, and soon a phone number, so it can read mail, reply and use login codes.
Free plan · Developer tools · Developers
- Pullfrog
A GitHub app that runs AI agents in GitHub Actions to review pull requests, triage issues and fix failing CI.
Free plan · Developer tools · Developers
- Vessel
A desktop browser that lets AI assistants click, fill forms and browse websites while you watch and step in.
Free plan · Developer tools · Individuals and families