Fact comparison
COG Second Brain vs PM Operating System in Claude Code
Summary: COG Second Brain, An open-source second brain made of markdown files, Obsidian and git. It ships 33 to 35 skills, six worker agents, four read-only verifiers and a people CRM. It works with Claude Code and several other agent CLIs.; PM Operating System in Claude Code, A paid pack of 103 files with 41 slash-command workflows for PRDs, research synthesis, planning, analytics and launches. Each workflow reads a company-context file first. Seven reviewer personas simulate cross-functional review on demand.. Stated plan prices: COG Second Brain, Free; PM Operating System in Claude Code, $49 once. Licence: COG Second Brain, Not stated; PM Operating System in Claude Code, one time. Industries: COG Second Brain, Research, Software and SaaS, Startups; PM Operating System in Claude Code, Software and SaaS, Startups. Functions: COG Second Brain, Operations, Project management, Research; PM Operating System in Claude Code, Data and reporting, Project management, Research. Runtimes: COG Second Brain, Claude Code, Cursor, Gemini CLI, Codex, Kiro, Antigravity; PM Operating System in Claude Code, Claude Code, Cursor, VS Code. Company sizes: COG Second Brain, solo, 2-10; PM Operating System in Claude Code, solo, 2-10, 11-50. Self-updating: COG Second Brain, Not stated; PM Operating System in Claude Code, No. Support: COG Second Brain, GitHub issues; PM Operating System in Claude Code, Not stated. AIOS Market rating: COG Second Brain, 7.5 / 10; PM Operating System in Claude Code, 5.5 / 10. Autonomy: COG Second Brain, Autonomy: 5 / 10; PM Operating System in Claude Code, Autonomy: 3 / 10. Depth: COG Second Brain, Depth: 8 / 10; PM Operating System in Claude Code, Depth: 7 / 10. Ease of setup: COG Second Brain, Ease of setup: 6 / 10; PM Operating System in Claude Code, Ease of setup: 5 / 10. Ownership and privacy: COG Second Brain, Ownership and privacy: 10 / 10; PM Operating System in Claude Code, Ownership and privacy: 8 / 10. Value for money: COG Second Brain, Value for money: 9 / 10; PM Operating System in Claude Code, Value for money: 8 / 10. Updates and support: COG Second Brain, Updates and support: 9 / 10; PM Operating System in Claude Code, Updates and support: 3 / 10. Security: COG Second Brain, Security: 7 / 10; PM Operating System in Claude Code, Security: 4 / 10. Maturity and traction: COG Second Brain, Maturity and traction: 7 / 10; PM Operating System in Claude Code, Maturity and traction: 5 / 10. Install method: COG Second Brain, git clone then ask your agent to run onboarding, or npx skills add; PM Operating System in Claude Code, Download files from Gumroad and open in Claude Code. Install time: COG Second Brain, About 2 minutes (stated); PM Operating System in Claude Code, Not stated. Data privacy: COG Second Brain, Plain markdown files in your own repo; PM Operating System in Claude Code, Local files in your own Claude Code project; optional tool integrations you configure. Rankings are based on editorial stars.
Listed options
Swipe or scroll the table horizontally to view every fact.
| Fact | COG Second Brain | PM Operating System in Claude Code |
|---|---|---|
| Type | operating system | operating system |
| Summary | An open-source second brain made of markdown files, Obsidian and git. It ships 33 to 35 skills, six worker agents, four read-only verifiers and a people CRM. It works with Claude Code and several other agent CLIs. | A paid pack of 103 files with 41 slash-command workflows for PRDs, research synthesis, planning, analytics and launches. Each workflow reads a company-context file first. Seven reviewer personas simulate cross-functional review on demand. |
| Seller | AIOS Market | AIOS Market |
| Stated plan prices | Free | $49 once |
| Licence | Not stated | one time |
| Industries | Research, Software and SaaS, Startups | Software and SaaS, Startups |
| Functions | Operations, Project management, Research | Data and reporting, Project management, Research |
| Runtimes | Claude Code, Cursor, Gemini CLI, Codex, Kiro, Antigravity | Claude Code, Cursor, VS Code |
| Integrations | Not stated | Not stated |
| Company sizes | solo, 2-10 | solo, 2-10, 11-50 |
| Self-updating | Not stated | No |
| Team sharing | Not stated | Not stated |
| Seats included | Not stated | Not stated |
| Install verification | Not verified | Not verified |
| Security verification | Not verified | Not verified |
| Install difficulty | moderate | moderate |
| Support | GitHub issues | Not stated |
| Installs | 0 | 0 |
| Class | Full operating system (installed) | Full operating system (installed) |
| Usefulness level | 3 / 5: Capable | 3 / 5: Capable |
| AIOS Market rating | 7.5 / 10 | 5.5 / 10 |
| Buyer rating | No buyer reviews yet | No buyer reviews yet |
| Sample listing | No | No |
| Autonomy | Autonomy: 5 / 10 | Autonomy: 3 / 10 |
| Depth | Depth: 8 / 10 | Depth: 7 / 10 |
| Ease of setup | Ease of setup: 6 / 10 | Ease of setup: 5 / 10 |
| Ownership and privacy | Ownership and privacy: 10 / 10 | Ownership and privacy: 8 / 10 |
| Value for money | Value for money: 9 / 10 | Value for money: 8 / 10 |
| Updates and support | Updates and support: 9 / 10 | Updates and support: 3 / 10 |
| Security | Security: 7 / 10 | Security: 4 / 10 |
| Maturity and traction | Maturity and traction: 7 / 10 | Maturity and traction: 5 / 10 |
| Operating systems | macOS, Linux, Windows | macOS, Linux, Windows |
| Install method | git clone then ask your agent to run onboarding, or npx skills add | Download files from Gumroad and open in Claude Code |
| Install time | About 2 minutes (stated) | Not stated |
| Data privacy | Plain markdown files in your own repo | Local files in your own Claude Code project; optional tool integrations you configure |
| Agents listed | Not stated | Not stated |
How to choose
- Compare the stated plan and billing terms.
- Check runtime and operating-system requirements.
- Review installation and licence details.
- Confirm data privacy and support information.
Frequently asked questions
- How many listings are listed?
- 2 are listed right now: COG Second Brain and PM Operating System in Claude Code.
- What do listings cost?
- Stated prices: free to $49, across 2 priced plans. Check each listing for current terms.
- Which runtimes do listings need?
- The listings name Antigravity, Claude Code, Codex, Cursor, Gemini CLI, Kiro, VS Code.