NimbalystvsRinger
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Nimbalyst
Stravu · Agent harness
OSSMCP
Panel
6.93 spec wins
- Reliability
- 6.5
- Usefulness
- 6.7
- Cost
- 8.2
- Longevity
- 6.3
“It ships an Excalidraw editor, so your agents can now produce the architecture diagram nobody will read either.”
Ringer
Nate Jones Media · Agent harness
Panel
6.91 spec wins
- Reliability
- 6.8
- Usefulness
- 7.3
- Cost
- 7.8
- Longevity
- 5.5
“A local page shows every worker's token burn as it happens, which is either observability or a very slow slot machine.”
Spec by spec
| Spec | Nimbalyst | Ringer |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local |
| Platforms | macos, linux, windows | macos, linux, windows |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | Yes | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | YesAn embedded Ghostty terminal is bundled alongside the agent sessions. | Yes |
| Multi-file edits | Yes | YesFiles are changed by the worker CLI Ringer spawns for each task, each in its own directory. |
| Git operations | Yes | YesA manifest can run each task in a detached git worktree; Ringer does not commit or open pull requests itself. |
| Browser control | No | No |
| Sandboxed execution | No | No |
| Multi-agent orchestration | Yes | Yes |
| Headless / CI mode | No | YesRuns are driven from a JSON manifest with no interactive step, and a mock engine in the sample config lets the stack be exercised in CI without an API bill. |
| Models | ||
| Backbone | via managed agents (Codex, Claude Code, OpenCode, GitHub Copilot, Gemini) | Codex, Grok, any CLI configured as an engine |
| Bring your own model | YesCodex and Claude Code are fully supported; OpenCode and GitHub Copilot are listed as alpha, with a Gemini provider also available. | Yes |
| Local models | No | No |
| Cost | ||
| Pricing model | byok | byok |
| Starts at | $0/mo | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | No |
| License | MIT | PolyForm-Shield-1.0.0 |
| GitHub stars | 1,816 | 294 |
Which one would each critic pick
| Critic | Nimbalyst | Ringer | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.5 | 7.3 | Nimbalyst — Pick it if you want to read every agent change before it lands; pick Proliferate if you would rather the agents just run and you check the branch later. |
| El Crítico | 6.5 | 6.5 | no preference |
| El Profesor | 7.0 | 7.8 | Ringer — Pass and fail are decided by executing the task's own check command, and a baseline mode validates those checks before a single worker is spawned. |
| La Inversora | 6.5 | 6.3 | Nimbalyst — Stravu is shipping this as the successor to Crystal, which is a second attempt with the same team, and 1,646 stars is audience rather than revenue. |
| La Jefa | 6.3 | 6.5 | Ringer — A JSON manifest with no interactive step and attempts written to Postgres, plus a mock engine so a pipeline can exercise it without an inference bill. |
| El Hacker | 7.8 | 7.0 | Nimbalyst — MIT, an MCP client so my servers attach, an EditorHost SDK for file types nobody anticipated, and Ghostty embedded instead of a homemade terminal. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.