AgentKitten vs improv.sh

AgentKitten and improv.sh are both cli coding agents tracked by AIDiveForge. Below is a side-by-side comparison of pricing, capabilities, platforms, and ownership — sourced from each tool's live website and verified before publishing.

AgentKitten

Orbit selects a task from a dependency-ordered backlog, hands it to the configured agent adapter, runs tests, lint, and type checks against the result, and only advances the orbit when those gates pass. Every run writes four artifacts: structured agent output, rubric scoring, an accept-or-iterate recommendation, and a human-readable progress log. The workflow is agent-neutral — Claude, Codex, Cursor, or any adapter you wire up behind the same contract. Where it breaks: Orbit is intentionally minimal, so teams expecting a hosted dashboard, a GUI, or built-in multi-agent parallelism will find precious little of that. The harness is a loop, not a platform.

improv.sh

improv operates as a task harness: the @im call pulls repo context, detects your test commands, writes acceptance criteria, and packages shell validation steps into one spec the agent can implement on turn one. The loop infrastructure is the distinguishing piece — judges run your actual exit-code commands (npm test, typecheck, build), so done means your tests pass, not that the agent says it's done. The tool installs locally via curl with no external API keys required, and the Chrome extension brings the same engine into web-based chat interfaces. The 920-skill library and daily auto-research loop suggest the routing layer will keep growing — but the page offers no independent benchmarks to validate the token-savings figures cited.

Attribute	AgentKitten	improv.sh
Pricing	Free	Free
Free trial	No	No
Open source	Yes	Yes
Has API	No	No
Self-hosted option	Yes	Yes
Platforms	Linux, macOS, Python 3.8+	VS Code, Cursor, Claude Code, terminal, Chrome
Pros	Validation gates block task advancement until tests, lint, and type checks pass, which means the agent cannot silently ship a broken diff and have it logged as complete. Four structured artifact files per orbit — result, evaluation, review, and progress log — so you can compare agent behavior across models with evidence instead of anecdotes. Dependency-ordered backlog execution keeps each orbit scoped to one task at a time, so the run log stays traceable and retries do not bleed context across unrelated work. Agent-neutral adapter design, so swapping the underlying coding model behind the same validation contract requires no changes to the harness or the artifact schema. MIT licensed and self-hosted with a replay demo that needs no API key, so you can audit the full workflow loop before committing any credentials or infrastructure.	Repo-aware spec compilation pulls your actual test commands and package scripts into the task before the agent starts, which means the agent implements against your real constraints instead of inventing them mid-run. Exit-code judges close the loop on real shell commands — npm test, typecheck, build — so you are not relying on the agent's self-assessment of whether it finished. Task memory persisted under .improv/tasks/ survives session boundaries, so an agent restarted mid-task picks up status and spec instead of starting the discovery cycle again. Local-first install with no external API keys required, which means the harness runs in air-gapped or locked-down environments where cloud tooling is blocked. Chrome extension and VS Code/Cursor Marketplace extension share the same local engine, so the spec compilation and judge loop work whether you are in the IDE or a browser-based chat interface — without switching tabs.
Cons	There is no API, no hosted runtime, and no GUI — all interaction is CLI-driven and all artifacts are local JSON files, so any team that needs a dashboard their product manager can open without a terminal will build that layer themselves or abandon Orbit for a platform that ships one. The harness runs one orbit at a time in a single-task loop; teams that need parallel agent execution across multiple workstreams hit this architectural boundary immediately and route around it by running separate harness instances manually, which breaks the unified progress trail. Adapter support covers JSON-speaking CLI agents, but integrating a coding tool that does not expose a CLI or JSON output requires writing and maintaining a custom adapter — at which point the integration work exceeds what smaller teams budgeted for a validation harness. The artifact schema and rubric scoring are defined by the harness; teams with compliance requirements that specify a different evidence format reformat the JSON downstream or switch to a purpose-built audit pipeline that natively matches their schema.	Task state is written to .improv/tasks/ on the local machine. Teams with more than one developer working the same codebase have no shared task state — there is no sync layer described on the page — so parallel agent runs on different machines produce divergent task records with no reconciliation path. The tool exposes no API surface, so teams that want to trigger improv from a CI pipeline or wrap it in a custom orchestration layer cannot. Teams hitting this wall move to harness frameworks that expose programmatic interfaces — at which point they are maintaining the prompt compilation logic themselves. The token-savings figures on the page (~613 tokens median) are vendor-reported with no independent reproduction methodology described. Teams making adoption decisions based on cost reduction should treat these numbers as illustrative until they run their own baseline comparison. Chrome extension installation requires either the Chrome Web Store or a manual sideload script — neither path is available in Firefox or Safari. Teams on non-Chromium browsers are limited to the terminal install, losing the browser chat integration entirely.

Bottom line

AgentKitten and improv.sh are closely matched on pricing model, openness, and API availability — pick by feature set and platform support in the table above.

Frequently asked questions

What is the difference between AgentKitten and improv.sh?

AgentKitten is Free and open source, while improv.sh is Free and open source. Compare pricing, free trial, API, platforms, and pros/cons in the table above on AIDiveForge.

Is AgentKitten better than improv.sh?

It depends on your workflow. Use the side-by-side attributes (pricing, open source, API, self-hosted, platforms) to decide. AIDiveForge does not rank a universal winner — we publish verified facts so you can choose.