API Spector vs free Postman and Bruno
Short version: Most comparisons put API Spector next to Postman's paid
platform. This one uses the versions testers actually run day to day: Postman's
Free plan and the open-source Bruno client, so the differences are the
ones you would really hit without paying.
The Postman column describes the Free plan as it stands in early 2026.
Postman revises its free-tier caps often (seats, monitor calls, runner usage),
so treat the figures here as a snapshot and check Postman's current pricing
before you rely on one. "Limited" means the capability exists but is
constrained on that tool's free tier: a usage cap, a cloud requirement, or a
manual workaround.
Side by side
Foundations
|
API Spector (free desktop) |
Postman (Free) |
Bruno (open source) |
| Price to use the client |
Free |
Free, 1 user |
Free, MIT open source |
| Account / sign-in |
Not required |
Required for most workflows |
Not required |
| Where your data lives |
Your machine (files) |
Postman cloud by default |
Your machine (.bru files) |
| Works fully offline |
Yes |
Limited; sync is central |
Yes |
| Git-reviewable storage |
Yes, diff in a pull request |
No, cloud-synced |
Yes, .bru text files |
| Seats on the free tier |
Unlimited (local) |
1 user |
Unlimited (local) |
| Workspaces / project structure |
Unlimited |
Limited on Free |
2 on the free tier |
Requests and protocols
|
API Spector |
Postman (Free) |
Bruno |
| REST / HTTP |
Yes |
Yes |
Yes |
| GraphQL |
Yes, introspection builder + subscriptions |
Query + variables |
Query + variables |
| SOAP + WSDL loader |
Yes, builds the envelope |
Manual, no WSDL import |
No |
| gRPC |
Unary + server streaming |
Yes |
Yes |
| WebSocket, Socket.IO, MQTT, SSE |
All four |
WebSocket only |
Limited |
| Multipart / file upload |
Yes |
Yes |
Yes |
Test data and data-driven runs
|
API Spector |
Postman (Free) |
Bruno |
| CSV / JSON data tables |
Built-in editor, import and export |
Via runner, capped on Free |
CSV / JSON iteration |
Per-row {{variables}} |
Yes |
Yes |
Yes |
| Same data drives exported tests and flows |
Yes |
No |
No |
Beyond the request client
|
API Spector |
Postman (Free) |
Bruno |
| Export to real test code |
Robot, Playwright, Karate, REST Assured, supertest |
Snippets / Newman |
No |
| Contract testing |
Built in, Pact-compatible |
External tooling |
No |
| Mock servers |
Local (+ optional cloud) |
Cloud, capped on Free |
No |
| Monitors / scheduled checks |
Optional cloud |
About 1,000 calls/mo on Free |
No |
| Visual flows (chain on a canvas) |
Yes |
Postman Flows, cloud + limited |
No |
| Fuzz testing (spec-driven) |
Yes |
No |
No |
| OpenAPI coverage + CI gate |
Yes |
Paid platform feature |
No |
Secrets and security
|
API Spector |
Postman (Free) |
Bruno |
| External secret managers |
Vault/OpenBao, AWS, Azure, GCP, 1Password |
Vault/env, cloud-synced vault |
None by default, env vars only |
| Local encryption |
AES-256-GCM on disk |
Cloud vault |
Env-based |
| Secrets stay on your machine |
Yes |
Synced by default |
Yes |
Import and interop
|
API Spector |
Postman (Free) |
Bruno |
| Import from other tools |
Postman, Insomnia, Bruno, OpenAPI, HAR, cURL, WSDL, SoapUI/ReadyAPI, .http, Arazzo |
Postman formats, OpenAPI, cURL |
OpenAPI, Postman, Insomnia, cURL |
| EU-built, GDPR-first, local by default |
Yes |
US cloud platform |
OSS, local |
What the differences mean in practice
- Your CSV drives everything. Import a
.csv into a data table and every row
becomes a set of {{variables}}. The same table feeds the request runner, a
visual flow, and the Robot Framework or Playwright code you export, with no
monthly cap on how often it runs. Postman does data-driven runs too, but the
Free plan limits runner usage; Bruno iterates CSV/JSON but stops at the client.
- One tool, not a stack of add-ons. Mock servers, contract testing, visual
flows, fuzz testing, and OpenAPI coverage are in the app. On Postman Free these
are capped or cloud-gated; in Bruno they are not there.
- Secrets never leave the machine. Reference Vault/OpenBao, AWS, Azure, GCP,
or 1Password directly, or keep values in a local AES-256-GCM store. Bruno has no
secret-manager integration by default, and Postman's vault syncs to its cloud.
- Tests you can take with you. Export a collection to Robot Framework,
Playwright, Karate, REST Assured, or supertest and run it in your own CI, with
no proprietary runner in the middle.
Pricing
All three clients are free to use. API Spector's desktop app is free and
local-first; its optional cloud (hosted mocks, monitors, and
a contract broker) is Pro or Team, and never required for anything above.
Postman's Free plan is the cloud platform with the caps listed here; Bruno's paid
tiers add client features and lift the workspace limit.
Compare the yearly cost for your team size.
Choose API Spector if
- You want a local-first tool with no account, unlimited workspaces, and secrets
that stay on your machine.
- You need more than a request client: mocks, contracts, flows, fuzzing, coverage,
and test-code export in one place, without paying to lift a free-tier cap.
See the full single-tool pages for Postman and Bruno.