ArkainvsBolt
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Arkain
goorm · Web app builder
#193MCP
Panel
4.82 spec wins
- Reliability
- 4.8
- Usefulness
- 5.2
- Cost
- 4.2
- Longevity
- 5.2
“Its prompt-to-app builder is free for three uses, which is roughly how many attempts it takes to describe what you wanted.”
Bolt
StackBlitz · Web app builder
#159MCP
Panel
4.91 spec wins
- Reliability
- 4.5
- Usefulness
- 5.3
- Cost
- 4.3
- Longevity
- 5.5
“Open source until December 2024, metered ever since, and the meter mostly counts uploading your own files to the model.”
Spec by spec
| Spec | Arkain | Bolt |
|---|---|---|
| Architecture | ||
| Category | Web app builder | Web app builder |
| Runs | cloud | sandbox, cloud |
| Platforms | web | web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | Yes | Yes |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | NoRepositories are imported from GitHub, but the docs do not describe the agent committing or opening pull requests. | Yes |
| Browser control | YesArkain itself runs in the browser and the agent has a web fetch tool; it does not document driving a browser as a tool. | NoNo browser-driving or app-testing agent is documented; Standard and Max differ only in how much the agent reasons per step (https://support.bolt.new/building/using-bolt/agents.md). |
| Sandboxed execution | YesEvery project runs in its own Linux container in Arkain's cloud, sized by the plan. | Yes"Bolt relies on WebContainers, a browser-based runtime from StackBlitz that enables a full-stack development environment in the browser" — an in-browser VM, not a container you manage. |
| Multi-agent orchestration | No | No |
| Headless / CI mode | No | No |
| Models | ||
| Backbone | Claude Sonnet 4.6, Claude Sonnet 4.5, Claude Haiku 4.5, Claude Opus 4.5, GPT-5.2, GPT-5.4, GPT-5 mini, Gemini 3 Pro | Claude |
| Bring your own model | No | No"Bolt handles model selection behind the scenes" — no model or provider picker, custom endpoint or key. |
| Local models | No | No |
| Cost | ||
| Pricing model | mixed | subscription |
| Starts at | $0/mo | $25/mo |
| Free tier | Yes | Yes |
| Bring your own key | No | No |
| Openness | ||
| Open source | No | No |
| License | proprietary | proprietary |
| GitHub stars | n/a | 16,569 |
Which one would each critic pick
| Critic | Arkain | Bolt | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 5.8 | 5.5 | Arkain — Pick this if you want a working environment without installing one; pick a local terminal agent if you would rather own the machine your code is edited on. |
| El Crítico | 4.8 | 4.8 | no preference |
| El Profesor | 5.0 | 4.8 | Arkain — The agent is documented as independently exploring the codebase, but the retrieval method behind that verb is not described, and no evaluation accompanies the claim. |
| La Inversora | 5.8 | 6.0 | Bolt — StackBlitz pivoted from an IDE to an app builder, open-sourced a core it stopped updating, and now competes on features in the most crowded category on this board. |
| La Jefa | 4.5 | 5.0 | Bolt — JavaScript only, no headless mode, enterprise on request, and a meter that grows with repository size; a demo tool for the design team, not yet for engineering. |
| El Hacker | 3.3 | 3.5 | Bolt — The MIT repo stopped in December 2024, the hosted product is closed, Claude only, no key of my own; WebContainers are clever and I still cannot own any of it. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.