Alternatives to S2
S2: A hosted API for appending to and reading from durable real-time streams, aimed at developers building agents and event pipelines. Here are 24 other products that do a similar job. Of these, 20 have a free plan.
- AgentLine
Gives AI agents a US or Canadian phone number for calls and SMS, usable over MCP, REST or an agent skill.
Free plan · Developer tools · Developers
- AgentsProof
Traces AI agent runs, scores them against your own rules and test cases, and gives a shareable report link.
Free plan · Developer tools · Developers
- AI Commander
Lets AI assistants like Claude, Codex or ChatGPT run shell commands and background jobs on machines you own, with no inbound ports opened.
Free plan · Developer tools · Developers
- AutoMQ
A Kafka-compatible streaming service that keeps data in cloud object storage to cut broker and network costs for engineering teams.
Pay as you go · Developer tools · Developers
- DashClaw
Holds risky actions from unattended AI coding agents until someone approves them from a dashboard or phone, and logs each decision.
Free trial · Security and passwords · Developers
- Failproof AI
Traces AI coding agent runs, spots where they fail and enforces rules that stop repeat failures as they happen.
Free plan · Uptime and monitoring · Developers
- localscreenshot
Lets AI assistants and developers grab clean web page screenshots from 227 countries through MCP, a CLI or a REST API.
Free plan · Developer tools · Agencies
- 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
- machine0
Persistent cloud virtual machines with up to 60 vCPUs and optional GPUs, which coding agents drive via CLI or MCP, charged per minute.
Since 2026
Pay as you go · Developer tools · Developers
- Okteto
Gives AI coding agents and developers isolated full-stack environments on your own Kubernetes setup to test code against real services.
Since 2025
Free plan · Developer tools · Developers
- Omnara
An open-source API and dashboard for developers to deploy and run stateful AI agents on any model, either hosted or on their own servers.
Since 2025
Free plan · Developer tools · Developers
- onemcp
A hosted portal that joins your MCP servers into one endpoint with OAuth, so AI agents load far fewer tool definitions.
Free plan · Developer tools · Developers
- Preloop
Open-source gateway that tracks spend, sets budgets and requires approvals for AI coding agents and their tool calls.
Free · Security and passwords · 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
- Yokka
A kanban board that shows what each AI coding agent is doing and alerts you when one needs your input.
Free plan · Projects and tasks · Developers
- Lathe
Deploys an app your coding agent built onto one dedicated managed machine with database, cache and backups for a flat monthly price.
Free plan · Developer tools · Developers
- Layerbase
Managed and serverless databases across 19 engines such as Postgres, MySQL and Redis, with data branching and flat monthly prices.
Free plan · Developer tools · Developers
- LibreDB Studio
A browser database editor you deploy next to your databases so a team can query Postgres, MySQL, MongoDB and more.
Free · Developer tools · Developers
- Mist
Self-hosted platform that deploys Docker apps from Git with domains, SSL and databases for small dev teams.
Since 2026
Free · Developer tools · Developers
- OpenPanel
A hosting control panel that gives each customer their own isolated container with separate database, PHP and cache.
Free plan · Website builders · Agencies
- AgentReady
Crawls a website and gives AI agents an MCP endpoint, llms.txt and cited answers, plus stats on agent visits.
Free plan · SEO
- Athas
A light open-source code editor with coding agents, terminals and Git built in, for Mac, Windows and Linux.
Free · Developer tools · Developers
- 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
- Dorothy
Mac app for developers to run, watch and coordinate several AI coding agents side by side with a task board.
Free · Developer tools · Developers