Kosuke provides a live sandbox environment that runs a codebase so product managers, designers, and marketers can independently complete small tickets such as UI tweaks, feature flags, or form changes.
Funding
Funding not disclosed
Founders
Product
Problem
Product teams often need to implement small UI tweaks, feature flags, or form updates, but must rely on engineers to make and test these changes. Without a realistic preview of the live codebase, non‑technical stakeholders cannot verify their work, leading to blind diffs, review bottlenecks, and delayed releases.
Solution
Kosuke runs the full application stack in an on‑demand sandbox for each ticket, allowing product managers, designers, and marketers to edit code, database entries, and environment settings directly. The sandbox provides an interactive preview that reflects the actual front‑end, back‑end, mobile, and data layers, enabling stakeholders to test and iterate until the change is ready. Once satisfied, the user opens a pull request that already contains a validated change, so engineers receive clean, pre‑tested PRs that can be merged without additional QA. Shareable preview links let sales, customer success, or external reviewers see the updated functionality without any developer involvement.
Target Audience
Primary users are product managers, UX designers, and marketing specialists who need to ship minor product updates, as well as engineering teams that want to offload low‑complexity tickets and focus on core development work.
Features
- Live sandbox environment that mirrors the repository’s full stack (frontend, backend, mobile, and databases) for each ticket
- Support for 10+ front‑end frameworks (e.g., Next.js, React, Vue, Svelte) and 14 back‑end stacks (Node.js, Python, Go, Ruby on Rails, etc.)
- One‑click integration with existing Git repositories; conventions and sandbox settings are configured once and reused automatically
- Shareable preview URLs that render the updated UI in real time, usable by non‑technical team members and external stakeholders
- No local development setup required for non‑engineers; changes are made directly in the cloud sandbox
- Built‑in diff and review workflow that presents a fully tested change rather than a raw code diff
- Upcoming “Dev Mode” that runs multiple AI agents in parallel within isolated sandboxes for advanced automation scenarios