Qodo Merge started as the hosted, enterprise version of PR-Agent, the open-source pull request reviewer. The PR-Agent README says Qodo Merge has since been rebranded and evolved into Qodo 2.0, a full AI code review platform, while PR-Agent continues as a community-maintained project. Both review pull requests for code problems and against team standards. Design Bug Bot is 21st's GitHub reviewer for the UI part of a pull request: whether changed React code reuses your components, stays on your spacing and type scale, and holds up on mobile.
Use Qodo, or self-hosted PR-Agent, for broad code review across repositories and Git hosts; add Design Bug Bot when your frontend reviews keep catching duplicate components and layouts that break on small screens.
Disclosure: This comparison is published by 21st, which makes Design Bug Bot. It is based on official documentation for each product, checked on September 14, 2026. It is not a head-to-head benchmark: we have not run a common benchmark, and nothing below reports test results.
Qodo, PR-Agent and Design Bug Bot at a glance
| Qodo (formerly Qodo Merge) | PR-Agent (open source) | Design Bug Bot | |
|---|---|---|---|
| Review job | Bugs, rule violations, requirement gaps, cross-repository conflicts. Review overview | Describe, review, improve and ask commands. PR-Agent | Changed UI code: component reuse, styles, layout risks. |
| Team standards | Review Standards from your codebase, PR history and requirements. Review overview | A best_practices.md or AGENTS.md file you list in repo_context_files. Improve docs | The components, tokens, spacing and type scale in the repository. |
| Design reference | A linked Figma design, via the Design Review Agent (research preview). UX deviations | Not described in the docs we checked. | Your existing UI code. |
| Rendered UI evidence | Not described in the docs we checked. | Not described in the docs we checked. | Desktop and mobile screenshots when an isolated render succeeds. |
| Fixes | One-click Apply Suggestion for small single-file fixes. Code review docs | Suggestions from the improve command. Improve docs | Suggested fix code, or a branch pushed for a fix pull request. |
| Git hosts | GitHub, GitHub Enterprise Server, GitLab, Bitbucket, Azure DevOps; Gerrit on premises. Install docs | GitHub, GitLab, Bitbucket, Azure DevOps, Gitea. PR-Agent | GitHub. |
| Hosting | Multi-tenant on all plans; single-tenant or on premises for Enterprise. Install docs | Self-run as a GitHub Action, CLI, Docker container or webhook. PR-Agent | Hosted; each review runs in a disposable sandbox. |
| Pricing | Credit-based Pro Team plan, custom Enterprise. Qodo pricing | Open source under the MIT license. PR-Agent | Five free successful reviews, then AI credits. Details |
What Qodo and PR-Agent cover well
Review that reaches past the diff. Qodo's agents draw on your full repository, pull request history, linked tickets and organizational standards. Findings include logic errors and edge cases, gaps against a linked spec, and breaking changes in related repositories. Review overview
Standards that come from your team. Qodo's Rule Miner turns recurring patterns from your pull request history into enforced rules. Code review docs The February 2026 rule system announcement also describes ingesting existing agent files such as .cursorrules and agents.md, and called the system a beta for GitHub users.
A first step toward design checks. The Design Review Agent compares a pull request with a linked Figma design and reports UX deviations, citing the Figma section as evidence and suggesting a prompt for the fix. Qodo labels it a research preview. UX deviations
An open-source path. PR-Agent is MIT-licensed, community-maintained, and works with OpenAI, Anthropic, Gemini, DeepSeek, Mistral and other models through LiteLLM. PR-Agent Its improve command follows a best_practices.md file once you add it to repo_context_files, and a focus_only_on_problems setting moves suggestions away from style. Improve docs
Where Design Bug Bot differs: your code is the reference
Qodo's design check needs a linked Figma design. Many UI review comments have no mockup behind them: nobody draws a frame that says to use the existing switch, or that a heading belongs on the next step of the type scale. Those rules live in the components and tokens your codebase already has.
Design Bug Bot starts from the repository. It reviews changed UI code against your existing components, tokens, spacing and type scale, so a hand-rolled toggle is compared with the one you already ship, whether or not anyone wrote a rule for it. It also looks for horizontal overflow, fixed widths, actions hidden on mobile and unnecessary dependencies.
It tries to show the result, too. Changed pages and components are picked from the diff and rendered in a React harness inside a disposable sandbox; when the render succeeds, the review can include screenshots and visual checks at desktop and mobile widths. Otherwise you still get source-supported findings, labeled as code-backed recommendations. Each finding explains the problem, points to the file and line when available, and includes suggested fix code.
What it does not do: review logic, security or backend code, check work against tickets, or run outside GitHub. It focuses on React codebases, and its check is advisory rather than blocking.
Where each fits
A pull request that matches the mockup but adds a second button. Qodo's Design Review Agent can compare the page with the linked Figma frame. Whether the button should have been your existing component is a codebase question, which is what Design Bug Bot checks.
PR-Agent with style suggestions turned down. If you run PR-Agent with focus_only_on_problems enabled, you chose fewer style suggestions on purpose. Design Bug Bot adds a design pass that stays quiet elsewhere: a pull request with no UI files gets a neutral check and no comment.
Self-hosted Git or strict data residency. Qodo offers single-tenant and on-premises deployment on Enterprise, and PR-Agent can be self-hosted. Design Bug Bot is a hosted GitHub App, so it is not an option there.
Qodo pricing
The following is listed on Qodo pricing on September 14, 2026. Qodo offers a 14-day free trial with no credit card. Pro Team starts at $30 a month for up to 30 users, with credits at $0.012 each, pooled across the team, in packs from 2,500 credits (about 18 reviews a month) to 20,000 (about 144). Enterprise is custom for teams of 30 or more. There is no permanent free tier, but qualified open-source projects can apply for free access. PR-Agent is MIT-licensed, and its repository notes that it is not the Qodo free tier.
Design Bug Bot gives new accounts five successful reviews free, then uses AI credits on a subscription that includes AI. See the trial and billing details.
Put both on the same UI pull request
- Use one pull request with a Figma link and one without. Run Qodo's Design Review Agent where a frame is linked, and write down which existing component or token each change should have used.
- Reintroduce a known duplicate. Bring back a hand-rolled version of a component your team later replaced with the shared one, and note which findings name the existing component and include fix code.
- Compare your real setup. For PR-Agent, record the model, whether best_practices.md is in repo_context_files, and whether focus_only_on_problems is on.
- Watch the quiet cases and the meter. Open a backend-only pull request to see which reviews comment, then compare Qodo credits per review with the listed estimates and Design Bug Bot's successful reviews with the free allowance.
To decide which components count as established, use the design system consistency audit. For another hosted reviewer, see Greptile vs Design Bug Bot.
Frequently asked
- Is Qodo Merge the same as PR-Agent?
- Not anymore. The PR-Agent README says Qodo Merge was the hosted, enterprise version of PR-Agent and has been rebranded and evolved into Qodo 2.0. PR-Agent remains a separate, MIT-licensed project maintained by the community.
- Can Qodo review UI design?
- Qodo's Design Review Agent, labeled a research preview, compares a pull request with a linked Figma design and reports UX deviations. Design Bug Bot uses a different reference: the components, tokens, spacing and type scale already in your repository.
- Does Design Bug Bot replace PR-Agent's improve suggestions?
- No. PR-Agent's improve command suggests general code changes across a pull request. Design Bug Bot reviews UI changes for component reuse and layout risks, and gives pull requests without UI files a neutral check and no comment.
- How is Qodo priced compared with Design Bug Bot?
- On September 14, 2026, Qodo's pricing page listed a 14-day trial and a Pro Team plan starting at $30 a month, with pooled credits at $0.012 each. Design Bug Bot gives new accounts five successful reviews free, then uses AI credits on a plan that includes AI.