AI can write code now. Everyone agrees on that. The question is: how much of the job does it actually finish?
Replit and Bolt generate apps from chat prompts — great for prototypes, rough for production. Devin calls itself an "AI software engineer" that can plan, code, and ship — closer to autonomous, but still session-based and human-supervised. Rosvelt takes it further: multi-agent, ticket-driven, persistent memory, and fully autonomous from ticket to deployed production code.
Same promise. Very different delivery. Here's the breakdown.
1. Rosvelt
Official site: rosvelt.com
Rosvelt isn't a code generator you chat with. It's a multi-agent platform where you assign tickets and AI ships production features end-to-end — the same way you'd assign work to a senior engineering team, except there are no developers. Agents plan the architecture, write clean code, run tests, open PRs, and deploy. They remember your repo, your conventions, and past decisions across sessions.
No prompting loops. No copy-pasting. No babysitting. You write the ticket, and the feature ships.
Pros
Cons
Pricing
Best for
Founders, agencies, and teams that want to ship real features to production from a ticket — without hiring developers or babysitting an AI chatbot.
2. Replit Agent
Official site: replit.com
Replit started as a browser-based IDE and evolved into an AI app builder. You describe what you want in a chat, and Replit Agent generates a full-stack app — frontend, backend, database — right in the browser. It's impressive for getting a v1 running fast. But it's fundamentally prompt-driven and session-based: every conversation starts from scratch, and complex projects require constant hand-holding.
In mid-2026, Replit moved to a dynamic pricing model that's drawn backlash — single tasks can run into hundreds of dollars if prompts aren't precise.
Pros
Cons
Pricing
Best for
Non-technical builders who want to spin up a prototype quickly in the browser — and don't mind babysitting the AI through every iteration.
3. Bolt.new
Official site: bolt.new
Bolt is an AI app builder by StackBlitz that generates full-stack apps from a single prompt. Powered by WebContainers, everything runs in the browser with zero local setup. Describe what you want, and Bolt generates React frontend, backend, and basic deploy. It integrates frontier coding models (Claude, GPT) and can import from Figma or GitHub.
Fast for prototypes. But like Replit, it's a prompt-and-iterate loop — not an autonomous agent that ships production features.
Pros
Cons
Pricing
Best for
Designers and non-technical founders who want to go from Figma mockup or idea to a working prototype in minutes — and are okay iterating manually from there.
4. Devin
Official site: devin.ai
Devin, by Cognition, calls itself "the AI software engineer." It's the closest competitor to Rosvelt in ambition: Devin can plan, code, debug, test, and open PRs. It integrates with GitHub, GitLab, Slack, Linear, and Jira. Nubank famously used it to accelerate a multi-million-line code migration with 20x cost savings.
But Devin is session-based and human-supervised. You prompt it, it works in a sandboxed environment, and a human reviews and merges. It's powerful for delegating repetitive tasks — but it's not a multi-agent system that autonomously ships features end-to-end from a ticket.
Pros
Cons
Pricing
Best for
Engineering teams that want to delegate repetitive coding tasks (migrations, refactors, bug fixes) to an AI assistant while keeping a human engineer in the review loop.
The Real Comparison
| Dimension | Rosvelt | Replit Agent | Bolt.new | Devin |
|---|---|---|---|---|
| How you work | Assign a ticket | Chat and prompt | Chat and prompt | Prompt a session |
| Autonomy | Full: self-planning multi-agent | Needs constant direction | Needs constant direction | Semi-autonomous, human reviews |
| Multi-agent? | Yes — agents coordinate in parallel | No | No | No (concurrent sessions, not coordination) |
| Memory | Persistent across sessions | Resets every session | Resets every session | Session-based only |
| Code quality | Production-grade with tests | Prototype-grade | Template-based | Good for delegated tasks |
| Deploys? | Yes, end-to-end | Yes (Replit hosting) | Yes (basic hosting) | No — opens PRs only |
| Needs developers? | No | No (but needs prompter) | No (but needs prompter) | Yes (to review and merge) |
| Best output | Shipped production features | Working prototypes | Working prototypes | PRs for review |
| Starting price | Studio $299/mo · Agency $499/mo · unlimited seats | Free / $20 | Free / $25 | Free / $20 |
The Gap Nobody Talks About
Replit and Bolt are generators: you prompt, they produce, you iterate. They're great at going from zero to prototype. But the moment you need to maintain, scale, or ship production software, the chat-and-iterate loop breaks down.
Devin is more autonomous than generators — it can plan and code real tasks. But it's still session-based, single-agent, and human-supervised. Every PR needs a developer to review and merge. It's a powerful assistant, not an autonomous team.
Rosvelt closes the gap. Ticket in, production feature out. No prompting loops. No human review bottleneck. No starting from scratch every session. Multi-agent coordination means complex features get broken down and executed in parallel — the way a real engineering team works, except it's AI.
Conclusion
All four tools use AI to build software. The difference is how far they take it.
🟠 Replit if you want to prototype a full-stack app from a chat prompt in the browser.
⚡ Bolt if you want to go from Figma or idea to working MVP in minutes.
🤖 Devin if you have developers and want an AI assistant to handle repetitive tasks while they review.
🚀 Rosvelt if you want to assign a ticket and get a deployed production feature back — no prompting, no loops, no developers.
Generators build prototypes. Assistants open PRs. Rosvelt ships product. 🔥