Honest comparison with existing tools. Every tool has trade-offs.
| Feature | Tack | Trello/Jira | Linear | Custom DB |
|---|---|---|---|---|
| Agent-first REST API | Yes | API exists, not agent-optimized | GraphQL, complex | Whatever you build |
| Sparse-field reads (save tokens) | ?fields=id,title | No | GraphQL fields | Manual |
| Atomic claiming (prevent duplicate work) | TTL-based, 409 on conflict | No | No | Manual |
| Structured decisions (not comments) | Options with buttons | No | No | Manual |
| Self-hosted | SQLite, one file | Cloud only | Cloud only | Yes |
| No vendor lock-in | MIT, fork freely | Proprietary | Proprietary | Yes |
| Setup time | 30 seconds | Account + config | Account + config | Hours to weeks |
Tack is not a replacement for Jira. If you need enterprise project management, use enterprise tools. Tack is for agent teams that need lightweight coordination without SaaS dependencies.
| Feature | Chock | HumanLayer | LangGraph HITL | Custom webhook |
|---|---|---|---|---|
| Standalone service | Yes | SDK required | Framework-coupled | Manual |
| Contingent approvals (structured conditions) | Schema-based | Yes/No only | Yes/No only | Manual |
| Model-agnostic | Pure HTTP | Python SDK | LangChain only | Yes |
| Web UI for reviewers | Built-in | Slack/email | No | No |
| Self-hosted | One file | Cloud | Yes | Yes |
| Callback support | POST on decision | Polling | State graph | Manual |
Chock's key differentiator is contingent approvals. Not just yes/no — approve with structured conditions that agents can parse and act on.
| Feature | Spur | Hookdeck | n8n | Custom script |
|---|---|---|---|---|
| Single-file deployment | Yes | Cloud | Platform | Yes |
| Template engine | {field.subfield} | Transform rules | Nodes | Manual |
| Multi-destination (Telegram/Slack/Discord/HTTP) | 4 built-in | HTTP only | Many integrations | Per-script |
| Event replay | Single + bulk | Yes | Manual | No |
| Self-hosted, no dependencies | SQLite | Cloud | Docker + Postgres | Yes |
| Setup time | 30 seconds | Account setup | Docker + config | Hours |
Spur is not a replacement for n8n or Zapier. If you need complex multi-step automations, use those. Spur is for routing agent events to where your humans are.