Bruno vs Postman: A Privacy-Focused API Client Comparison for Developers
API clients have quietly become one of the most sensitive pieces of software on a developer’s machine. They hold production credentials, customer data samples, internal endpoint maps, and authentication tokens. Yet until recently, almost nobody asked where all of that went after you hit “Send.”
That changed in 2023, when Postman disclosed a breach in which attackers gained access to a cloud database and exfiltrated API keys belonging to roughly 30,000 customers. The same year, the company’s decision to remove the offline Scratch Pad and require users to sign in to use the app triggered a wave of migration. Bruno, an open-source, Git-native API client that stores everything as plain files on your local disk, became one of the main beneficiaries of that backlash.
This comparison looks at how the two tools differ on privacy, architecture, features, and daily workflow—and where each one still makes sense.
The Core Architectural Difference
The privacy question in API clients comes down to one thing: where your collections live.
Bruno is offline-first by design. Collections are stored as .bru text files inside a folder on your filesystem. There is no mandatory account, no cloud sync, and no telemetry that phones home with your request data. You can version a collection with Git, review changes in a pull request, and share it the same way you share code. The company behind Bruno sells an optional paid team plan, but the core app does not require it.
Postman is cloud-first. Collections, environments, and history are designed to live in Postman’s cloud, synced across devices and shared with teammates through workspaces. The company offers an offline mode, but it has repeatedly shifted the boundaries of what that mode covers—first removing the Scratch Pad in 2023, then partially restoring offline capabilities after user pushback. The direction of travel has consistently been toward cloud and toward accounts.
That difference has practical consequences. With Bruno, “where is my data?” has a one-line answer: in this folder. With Postman, the answer depends on which plan you’re on, which features you’ve enabled, and what the company’s current policy says.
Privacy and Data Handling Compared
| Bruno | Postman | |
|---|---|---|
| Account required | No | Yes (for most functionality) |
| Default storage | Local files | Postman cloud |
| Source code | Open source (MIT) | Closed source |
| Self-hosting | N/A—nothing to host | Enterprise plan only |
| Telemetry | Opt-in | On by default in many builds |
| Secrets in Git | Possible, but avoidable with .env files |
N/A—cloud storage |
The open-source point matters more than it might seem. With Bruno, you can audit what the app does with your data, or pay someone to. With Postman, you’re trusting a vendor’s security posture and privacy policy—which is a reasonable thing to do, but it is a different kind of trust.
One caveat worth stating plainly: local storage is not automatically secure. If you commit a Bruno collection containing a hardcoded bearer token to a public repository, you’ve leaked it just as surely as if you’d shared it in a cloud workspace. Bruno’s model pushes responsibility for secret hygiene back onto the developer, and teams need conventions—environment files in .gitignore, secret managers for CI—to use it safely.
Feature Comparison: Where Each Tool Wins
Postman’s advantage is breadth. It has mature support for mock servers, API documentation generation, automated monitoring, a public API network, and a scripting sandbox that a large ecosystem of tutorials and Stack Overflow answers is built around. If your team already runs its API lifecycle through Postman—design, mock, test, document, monitor—replacing it means replacing a workflow, not just an app.
Bruno’s advantage is focus and speed. The desktop app launches quickly, uses noticeably less memory than Postman’s Electron-based client, and keeps everything in a Git-friendly format. Its scripting layer uses a JavaScript-like syntax that will feel familiar to anyone who has written Postman tests, and it supports the standard collection formats for importing existing work. For teams that live in Git and treat API collections as code, this is a better fit than a cloud workspace.
Where Bruno still trails: collaboration features outside of Git, the depth of its API documentation tooling, and the size of its community. Postman has years of head start on ecosystem, integrations, and enterprise controls like SSO and role-based access.
Migration and Daily Workflow
Moving from Postman to Bruno is not painful. Bruno imports Postman collections and environments, and the translation of pre-request scripts and tests is mostly mechanical, though complex scripts using Postman-specific APIs may need rework.
The bigger adjustment is cultural. Instead of opening a shared workspace, you clone a repository. Instead of a “share collection” button, you open a pull request. Teams that already review infrastructure as code tend to find this natural. Teams that don’t may find it adds friction, and it’s worth being honest about that before switching.
A hybrid approach also works: keep Bruno for individual and small-team work on sensitive APIs, and keep Postman where its ecosystem genuinely earns its keep—public API documentation, monitoring, or client-facing mock servers.
Which Should You Choose?
Choose Bruno if:
- You handle production credentials or regulated data and want to minimize third-party exposure
- Your team already treats configuration as code and uses Git review workflows
- You want an open-source tool you can inspect, fork, or self-manage
- You’re working solo or on a small team without enterprise procurement needs
Choose Postman if:
- You rely on its broader API lifecycle features—mocks, monitors, docs, the public network
- Your organization has standardized on it and needs SSO, audit logs, and vendor support
- Your team prefers a managed, zero-setup collaboration model over Git-based sharing
The Takeaway
Bruno and Postman represent two different answers to the same question: should an API client be a local tool or a cloud platform? Postman bet on the platform, and it built the richer ecosystem as a result. Bruno bet on the file, and it won over developers who want their credentials to stay on their own disk.
If privacy and data ownership are your primary concerns, Bruno’s local-first, open-source model is the clearer choice. If you need the full API lifecycle in one managed product, Postman still delivers more—provided you’re comfortable with where your data lives. Many teams will reasonably end up using both, and that’s a fine outcome. The important thing is to make the choice deliberately rather than by default.