Modern API Tooling: An 11-Principle Scorecard

#api #tooling #testing #rest

A while ago I came across a really good article on the future of API tooling:

https://efp.asia/blog/2025/12/24/api-tooling-crisis/

It lays out a set of criteria for what modern API clients should look like:

Local-first, filesystem-centric: collections and requests live directly in the project repo
Support for OpenAPI specs and GraphQL schemas, plus straightforward testing
Zero login wall: works fully offline without accounts or mandatory cloud sync
Git-native collaboration: uses version control instead of proprietary cloud workspaces or seat licenses
Native performance: built with high-performance tech (e.g. Rust), not browser wrappers
Extensible design: modular plugin architecture that doesn’t bloat the core
Universal imports: OpenAPI, GraphQL, Postman collections, etc.
Proxy agnostic: works cleanly with interception tools like Charles or mitmproxy
Scripting and auth flows: pre-request and post-response hooks
Straightforward testing: built-in code-based testing of API responses

I agree with all of these. The only thing I’d add is pricing as another important dimension.

Recently I was experimenting with a pricing MCP and decided to run a quick test: evaluate all the API clients I know against these criteria using https://pulse.pricingsaas.com/.

Scoring was simple:

Each principle is rated 0 (missing), 1 (partial), or 2 (fully met). Final score is normalized to a 10-point scale.

Overall rankings (out of 10)

Bruno — 8/10
Voiden — 8/10
Yaak — 7/10
Insomnia — 6/10
cURL — 6/10
HTTPie — 5/10
Postman — 5/10
Requestly — 5/10
Hoppscotch — 4/10
Apidog — 4/10

Key takeaway: no perfect API client yet

Every tool fails on at least a few of the 11 principles, so none fully matches the “ideal” API tooling model. The ceiling right now seems to be around 8/10.

What separates the top tools (Bruno, Voiden, Yaak)

The strongest tools tend to share a few traits:

Local-first, filesystem-based storage
Git-native collaboration
No forced login (or minimal account gating)

Where they still fall short is usually native performance, since most GUI tools are built on Electron.

A few structural patterns across the space

Electron is the default weakness Most GUI tools (Bruno, Insomnia, Postman, Requestly, Hoppscotch, Apidog) rely on Electron. The only real exception is Yaak, which uses Tauri + Rust and is much closer to true native performance.
Zero-login is a clear dividing line Several major tools are effectively excluded because they require accounts: Postman, Insomnia, Hoppscotch, Apidog.
Pricing is becoming a core constraint Most tools are increasingly account-gated or paid-tier driven. Voiden stands out as fully free with no tiering, while Postman is heavily penalized due to its pricing model and limited free tier.

Tool-level notes (high level)

Bruno: strong balance of scripting, testing, and Git-native design, but held back by Electron
Voiden: most aligned overall, especially due to being fully free and extensible
Yaak: best native performance, but lacks scripting and testing
Insomnia: strong feature set, but weakened by login and pricing dependence
Postman: best-in-class scripting and testing, but cloud-first and heavy
cURL / HTTPie: great primitives, but not full API design environments

Final insight

The ideal API client would likely combine: