Slack
25 projects shared since May 2026 were built for Slack.
How these numbers are counted and compared: the method.
Summary
25 projects shared since May 2026 were built for Slack: add-ons, companions and plugins. 10 of them came in the last 12 weeks. The most-discussed project of the last 4 weeks is Out of Office (4 comments). It blocks chosen work apps on a phone after a set workday end time until morning, with widgets and vacation date ranges. The kinds of projects built for it most are AI agent orchestration platforms, Sports prediction games and AI text rewriting tools.
Projects built with it
0
Share of stated stacks, last 4 weeks
–
Adjusted trend, last 4 weeks vs previous 8 weeks
too few to tell
Add-ons built for it
25
Share of stated stacks, each week
Share rather than counts, so changes in how many posts a subreddit lets through don't show up as trends.
Often used with
- Not enough data
What's built with it
- Not enough data
Latest add-ons built for Slack
- Vibe Shift — Rewrites a Slack message in a chosen tone and drafts replies to threads using AI.“I built a Slack app because I kept rewriting messages five times before sending them”
- CursorFollow — Captures the active window and renders it into one stable shareable window that follows focus across apps.“I made a small open-source tool that lets you share one window in meetings and have it follow whatever you're working on”
- Out of Office — Blocks chosen work apps on a phone after a set workday end time until morning, with widgets and vacation date ranges.“My phone now roasts me every time I open Slack after 6 PM. I built it on purpose.”
- Doorlog — Logs team decisions from Slack with an owner, rationale, reversibility tag, and audit-trailed reversal.“Built a Slack bot to stop "wait, why did we decide that?" — looking for feedback”
- Karolina — Monitors customer account signals in Slack, surfaces what changed, and suggests next steps for approval before routing them to a team member.“Your scariest competitor isn’t another SaaS. It’s your customer + Claude this weekend.”
- codex-slack — Routes Slack channels to local project directories and relays messages to Codex sessions with thread control and scheduled tasks.“OSS: Fast codex/slack bridge for mobile vibing”
- WorldFixture — Generates a synthetic company whose Slack, GitHub, email and other vendor APIs stay in sync and change over time for testing and demos.“A fake SaaS company with emulated Github, Gmail, Slack, Object Storage and more. It's for dev, tests and demos.”
- Luffy — Runs recurring team work asynchronously across company tools from inside Slack, escalating to a human only for decisions or approvals.“We rebuilt Luffy’s website — what should we improve, and what should we not change?”
- SCM One-Pager for Slack — Generates one-page company summaries from SEC filings and posts them to Slack for finance club members.“Slackbot for Finance Students”
- I built a Slack bot to chase my… — Lists overdue invoices from QuickBooks in Slack and sends or drafts polite-to-final payment reminder emails through Gmail after the user approves them.“I built a Slack bot to chase my overdue invoices, and made sure it can't move money or send without my ok”
- copynpaste — Converts pasted text's formatting into the syntax of a chosen destination app, such as Slack, Notion, or X.“Helping launch a tool that fixes formatting when you paste text between apps (Notion→Slack, ChatGPT→X, etc)”
- Slacker — Watches selected Slack channels and surfaces threads that need attention, such as stale conversations, unclosed issues, and missed action items.“Slacker - Open Source app that surfaces the Slack threads that actually need attention”
- Lackey — Acts as a Slack-based company memory that answers questions from past messages and meetings, tracks tasks, and creates tickets assigned by ownership.“A company brain right in your Slack, with a full embedded memory system across all your apps”
- PathFinder — Generates structured text descriptions of shared diagrams in Slack threads and answers follow-up questions about them.“I built a Slack bot that reads diagrams aloud for blind coworkers”
- OpenTag — Lets users @mention AI coding agents inside GitHub issues and Slack threads, running them locally and returning results to the same thread.“I built a way to @mention AI agents inside GitHub issues & Slack threads looking for feedback”
Pitched as alternatives to Slack
- squad-chat — Provides a private group chat with presence and mentions inside a Claude Code terminal pane, without sending messages to Claude.“I built a group chat that lives inside Claude Code”
- Free Your Workflow — Catalogs free and open-source alternatives to paid productivity and no-code tools, organized by the paid tool they replace and by profession.“Directory of free/open-source alternatives to Notion, Airtable, Zapier, Slack and more”
- ReplaceAI — Searches an index of about 59,000 software tools to find free open-source and self-hostable alternatives to paid proprietary software.“I Vibe coded a fast, 0ms discovery engine to find open-source alternatives to expensive software (59k+ tools indexed)”
- Headrails — Routes handoffs between team AI agents through a shared inbox and stores their findings in a searchable shared memory.“I built a shared inbox for my team's AI agents so they'd stop routing their handoffs through humans in Slack channels”
- Deft — Provides a self-hosted workspace combining chat, tasks, notes, a knowledge base and calendar, with searchable records of decisions.“Another SaaS bill or build it myself? I may have overreacted.”
- MeetGeon — Syncs a PC and a phone by scanning a QR code to start a web call.“I lost my high school tech fair with this customizable Discord alternative, but I still want your feedback.”
- RealtimeChat — Provides open-source team chat with channels, DMs, threads, reactions, file sharing and search, plus bots and optional AI catch-up summaries.“I'm building an open-source Slack alternative because per-seat pricing gets ridiculous. Would you switch?”
- CPYNET — Passes short text or small files between machines via one-time in-memory pastes that delete after first read or a timer.“CPYNET: paste text between machines with curl, gone the moment it's read”
- Echo — Provides a Slack-style team chat with workspaces, channels, and direct messages with file sharing, using Postgres as the realtime message bus.“Built a Slack-style chat app — no Redis, and Postgres handles the realtime backplane”
- 8 years of failure to this… — Helps people who build products take them to market, according to the author's description.“8 years of failure to this…”
- FreeFlow — Provides an open source team chat where AI agents join channels as members, take requests in threads, and work where the whole team can see.“I gave my agent a ticket in a chat channel and it replied with a PR”
- Murmur — Stores personal notes in a browser-cached, offline-capable chat-style app that autosaves to a Google Sheet the user deploys and owns.“My weekend project: a private "Slack-for-one" that stores notes in your own Google Sheet”
- Bloxie — Runs asynchronous polls, meeting scheduling votes and structured team decisions with configurable tie-breaks, letting guests vote without accounts.“ReactNative SideProject Bloxie”
- DevContract — Syncs .env files between team members or machines via LAN peer-to-peer or an encrypted relay, with three-way merging and YAML-based local service checks.“I built a local-first P2P environment sync tool in Go to replace Doppler and Slack copy-pasting. No SaaS, no accounts.”
- Margin — Provides an open source team messaging platform with end-to-end encrypted direct messages, peer-to-peer and group calls, and channels and spaces for organizations.“I've been building an open source alternative to Teams in my spare time and just hit open beta”