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Desktop API client built specifically for gRPC and Protobuf, replacing the manual grpcurl-in-terminal workflow backend engineers fall back to since REST-first tools bolt on gRPC support.
Watch out · macOS only.
What to know▼
How it works
You register your .proto files once and it automatically discovers every gRPC service and method, rendering a schema-aware request editor with enums as dropdowns.
What's different
Built specifically for gRPC and Protobuf rather than REST tools with gRPC bolted on.
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A free, open-source Chrome DevTools extension for testing APIs — capture, inspect, edit, and replay HTTP requests without an external proxy, plus a quick header and secrets audit.
FreeOpen source
What to know▼
How it works
A Chrome DevTools extension that captures, inspects, edits, and replays HTTP/HTTPS requests without an external proxy, plus a Quick Security Check that audits headers and flags secrets or PII.
What's different
Works without needing to route traffic through an external proxy, unlike typical API testing setups.
Pricing
Free and open-source.
Best for
Developers testing API security directly inside Chrome DevTools.
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Collection of random generators for passwords, names, numbers, and colors with an API, for developers and casual users, instead of building your own generator.
What to know▼
How it works
Generate passwords, names, numbers, colors, and more through a customizable interface or an API.
What's different
No registration required for instant access.
Best for
Developers who want a random-generation API, or casual users needing a quick result.
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A REST API that lets developers order lab tests and biomarkers for patients, handling labs, kits, couriers and EU health compliance (GDPR, ISO 15189) behind the scenes. Built for developers integrating diagnostics into health apps, not for clinicians directly.
What to know▼
How it works
A single REST API to order any of 2,500+ biomarkers per patient, from a routine blood panel to whole-genome sequencing, returning structured JSON results via a live sandbox.
What's different
Handles the labs, kits, couriers and EU compliance stack (RiliBÄK, ISO 15189, GDPR) behind the API, reducing integration to three calls: create a profile, book a draw, read the result.
Best for
Developers integrating lab diagnostics into health apps, not clinicians using it directly.
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A Pusher-compatible WebSocket service built on Cloudflare, for developers needing realtime messaging infrastructure instead of switching to Pusher or Ably.
What to know▼
How it works
Drop-in replacement for Pusher using the same protocol, built on Cloudflare.
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An open-source SDK that unifies multiple payment providers (Paystack, Flutterwave, Razorpay, Monnify, Interswitch) behind one API, instead of integrating each provider separately across web, mobile, and no-code platforms.
FreeOpen source
What to know▼
How it works
Native SDKs for React, Vue, Svelte, React Native, Flutter, iOS, Android, plus no-code plugins for Shopify, WordPress, Webflow, Wix, Squarespace.
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Replays Chrome Network requests locally so developers can debug APIs without sending request data to a hosted workspace, instead of using cloud-based API clients.
Works offline
What to know▼
How it works
Copy any Network request as cURL, import into Pulse, edit and rerun locally; supports collections, JSON paths, diffs, validation tests, exports.
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An SDK and runtime that generates a personalized interface per user on top of a SaaS company's existing codebase, without a custom engineering build for each variant.
What to know▼
How it works
Ships shared primitives; each user's interface is generated, compiled, and sandboxed per request
Best for
B2B SaaS teams wanting per-user interfaces without custom engineering
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A Django REST Framework-style ViewSets library for FastAPI that generates full CRUD endpoints from one class, for developers who don't want to hand-write routes.
What to know▼
How it works
Registers LIST/GET/POST/PUT/PATCH/DELETE from a single class, with SQLAlchemy, Tortoise, or Peewee support and OpenAPI schemas.
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Handles form submissions, spam protection, email notifications, and file uploads through a single endpoint you point your HTML form to, instead of building a backend for form handling.
What to know▼
How it works
Point any HTML/JS form to one endpoint; it handles submissions, spam protection, notifications, autoresponders, uploads, and signed webhooks.
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News search API that matches articles by conceptual meaning rather than keyword matching.
What to know▼
How it works
Users describe what they're watching for in natural language, and the API returns scored, deterministic, auditable news results matched by conceptual meaning rather than keywords.
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An API for developers to verify email addresses (catching invalid, disposable, typo and role-based emails) before they enter a signup form or campaign.
What to know▼
How it works
one API call combines 15+ checks with a 0-100 trust score, under 100ms; also supports CSV batch processing
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A native desktop app development toolkit with its own markup, state model and renderer, for developers who want to skip Electron or a WebView.
What to know▼
How it works
A toolkit for building native desktop applications with declarative markup, a message-based state model, a component library, and its own native renderer.
What's different
No browser, no WebView involved — it's a fully native renderer rather than a wrapper.
Best for
Developers who want to build desktop apps without going through Electron or a WebView.
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A fast, privacy-first desktop REST API client built as a Postman alternative — for developers who want a local tool without their request data passing through a third-party cloud.
Data stays with you
What to know▼
How it works
A desktop REST API client built with Wails, Go and React for making and managing API requests.
What's different
Positioned as a privacy-first Postman alternative — a local desktop tool rather than one that routes requests through a third-party cloud.
Best for
Developers who want a fast desktop REST client without their request data passing through a third-party cloud service.
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Turns a single HTTP POST request into a push notification on your phone, for developers wanting alerts from CI, cron jobs, or webhooks without building an app.
Free
What to know▼
How it works
Send a POST request with a publish key and it's delivered as a push notification via topics
What's different
No SDK or account setup needed to send an alert
Pricing
Free to receive notifications
Best for
Developers wanting alerts from scripts, CI, or webhooks
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A Laravel package that wires up both the official WhatsApp Cloud API and personal-account WhatsApp connections behind one facade with an admin dashboard.
What to know▼
How it works
single facade covering Cloud API (templates/transactional) and a web-based personal-account connection (groups, status, freeform chat)
Best for
Laravel developers needing WhatsApp features Cloud API alone doesn't cover
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Free browser-based PDF and photo editing tools (edit, compress, convert, OCR) that never upload files, for privacy-conscious users avoiding paid software or sign-ups.
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Validates Tax ID numbers against country-specific rules for all 249 countries, showing exactly which checks passed or failed rather than a plain valid/invalid.
Free
What to know▼
How it works
Checks length, structure, checksum, and format rules per country via web UI or REST API
What's different
Shows rule-level detail instead of just valid/invalid
Best for
Developers and compliance teams validating TINs before they enter a system
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A plugin that adds SumUp's card checkout widget to Bagisto online stores. A narrow developer integration for one ecommerce platform, not a general payment tool.
What to know▼
How it works
Adds the SumUp inline checkout widget to Bagisto 2.x stores using SumUp's official JS SDK, so customers pay directly on the storefront without external redirects; supports sandbox and production modes, webhook-based payment confirmation, and full or partial refunds from the Bagisto admin panel.
Best for
Bagisto store owners who want to accept SumUp card payments directly in their storefront.
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A cookieless browser-fingerprinting SDK that re-identifies returning visitors across VPNs and cleared cookies for fraud prevention, a backend integration for developers, not a consumer product.
What to know▼
How it works
A drop-in JavaScript SDK with server-side signals that uses cookieless browser fingerprinting to re-identify returning visitors across VPNs, incognito mode and cleared cookies.
Best for
Developers integrating fraud prevention into their backend.
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A dynamic QR code platform (37+ types) with editable destinations, real-time scan analytics, and branding options.
What to know▼
How it works
Generates dynamic QR codes across 37+ types (URL, PDF, vCard, WiFi, menus, UPI payments, Google Review links) that can be edited after printing and tracked with real-time scan analytics by device, location, and time, with branding, UTM tracking, retargeting pixels, and team SSO.
Best for
Marketers, restaurants, retailers, and event organizers needing editable, trackable QR codes.
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A native desktop app for Windows, macOS and Linux built around API development workflows for developers, but the text is mostly marketing language with few concrete details.
What to know▼
How it works
A native desktop app for Windows, macOS, and Linux built around developer tooling for API development workflows.
Best for
Developers who want a native (not browser-based) app for API development tasks.
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Generates a full backend (models, migrations, CRUD, auth) from one config file for FastAPI/NestJS/Go, for developers who don't want to hand-write boilerplate.
Watch out · Next.js frontend generation is listed as 'coming soon,' not yet available.
What to know▼
How it works
Generates a full backend — models, migrations, CRUD, and auth — for FastAPI, NestJS, or Go Fiber from a single config.yaml, with a Studio for visually designing APIs, previewing generated code, and downloading a ready-to-deploy project.
What's different
Produces clean, editable code you fully own rather than a black-box generator.
Best for
Developers who don't want to hand-write backend boilerplate.
Watch out
Next.js frontend generation is listed as 'coming soon,' not yet available.
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An OAuth and OpenID Connect identity platform built on OpenIddict that auto-generates OAuth scopes from resources and permissions, instead of manually managing identity configuration.
What to know▼
How it works
Automatically generates OAuth scopes from an app's resources and permissions, with typed claims, JWT encryption, and multi-tenant workspaces.
Pricing
Free to start locally; paid when scaling to production.
Best for
Developers setting up OAuth/OIDC identity for an application who want to avoid hand-configuring scopes.
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A self-hosted platform for writing, previewing, and publishing interactive API documentation with a built-in try-it console, built on the open API Blueprint standard.
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A documentation tool for hosting and organizing API reference docs in one place, aimed at developer teams. The 'API' in the tagline refers to the docs it manages for you, not an API the product itself offers.
What to know▼
How it works
Hosts and organizes your API reference documentation in one place.
Best for
Developer teams that need a central home for their API docs.
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An API that pulls a company's logo, favicon, color palette and brand metadata from any domain, letting developers fetch brand assets programmatically instead of collecting them by hand.
What to know▼
How it works
An API that extracts a company's logo, favicon, color palette and brand metadata from any domain in one call.
What's different
Returns structured brand assets programmatically instead of collecting logos and colors by hand.
Best for
Developers who need to fetch brand assets for other companies automatically.
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Enterprise gamification infrastructure — a design studio, engine and embeddable widgets for adding badges, streaks and leaderboards to a product, integrated via code by engineering teams rather than used directly by consumers.
What to know▼
How it works
Embeddable gamification infrastructure — a design studio, engine and widgets that turn a product's existing user events into buddies, badges, streaks, marketplaces and leagues, designed across six frameworks.
What's different
Embeds with one line of code rather than requiring a custom-built gamification system.
Best for
Engineering teams adding gamification to an existing product.
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Converts old or PDF-based API documentation into an OpenAPI spec, Postman collection and client SDKs automatically, saving developers from manually transcribing messy legacy docs.
What to know▼
How it works
You drop in legacy or PDF-based API documentation and it produces a clean OpenAPI spec, a ready-to-import Postman collection, and client SDKs, without manual transcription.
Best for
Developers integrating against old, messy or poorly-documented APIs who want machine-readable specs instead of transcribing docs by hand.
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An open-source framework for developers and integrators to build custom business communication apps like auto-attendants and fax-to-email — a toolkit, not ready-to-use software.
Open source
What to know▼
How it works
An open-source communications framework that lets developers build custom communication applications such as auto attendants, fax-to-email and click-to-call, with custom business logic controlling incoming and outgoing communication.
What's different
Serves as a common server-side backend for CTI-related projects rather than a ready-to-use application.
Best for
Developers and integrators building custom telephony or communication applications.
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License and entitlement infrastructure for Apple apps: a Swift SDK with offline verification, device limits, trials and Stripe-based license minting, for developers who don't want to build licensing from scratch.
Works offline
What to know▼
How it works
Licensing and entitlement infrastructure for Apple apps: drop in a Swift SDK and verify entitlements locally using offline-ready Ed25519 leases, with device limits, trials and feature flags built in. Connect Stripe and licenses mint automatically from payments.
What's different
Offline-capable local entitlement verification plus automatic Stripe-driven license minting, rather than needing to build licensing infrastructure from scratch.
Best for
Developers of Apple apps who need licensing, trials and device limits without building that infrastructure themselves.
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A white-label SDK for embedding image and video editing, with templates and export, directly into your own product — built for developers, not a hosted editing service.
Can export my dataSelf-hosted
What to know▼
How it works
A programmable SDK for embedding an interactive image and video editor into your own product, including template automation, rendering and export, running inside your own architecture.
What's different
Delivered as a self-hosted SDK you control, rather than a hosted third-party editing service.
Best for
Developers who need to ship image or video editing inside their own product without building and maintaining an editor from scratch.
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A free API returning real-time air quality data (AQI, PM2.5, PM10) with strong coverage of Indian cities, plus an endpoint suggesting the best time window to go outside.
Free
What to know▼
How it works
Single API call returns AQI/PM2.5/PM10 and a safe/caution/avoid verdict
What's different
Better Indian city coverage than typical global AQI APIs
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A desktop HTTP testing and automation tool for developers, with request chaining, OpenAPI support and cURL generation. Runs fully offline, free, with no ads or subscription.
FreeWorks offlineNo subscription
What to know▼
How it works
A desktop HTTP testing environment for creating, automating and validating HTTP workflows, with OpenAPI support, request chaining, dynamic parameters, advanced response validation, and cURL generation.
What's different
Completely free and offline, with no ads, subscriptions, or feature restrictions, plus native ARM support.
Pricing
Free, with no ads, subscriptions, or feature restrictions.
Best for
Developers building and validating HTTP request workflows and APIs.
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A developer-facing REST API for real-time and historical currency and forex rates across 1000+ currencies — built for businesses and developers, not individual consumers.
Free
What to know▼
How it works
A REST API delivering real-time and historical exchange rates and currency conversion across 1022+ currencies, returning JSON or XML responses for integration into other applications.
Pricing
Free tier available.
Best for
Developers and fintech platforms that need to integrate live or historical currency data into their own applications.
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A free IP geolocation API returning country, city, ASN, timezone and threat signals for any IP address, with 50 free requests per minute across several data formats.
Free
What to know▼
How it works
An IP geolocation API returning country, city, ASN, timezone and threat signals for any IP address, available in JSON, XML, CSV and PHP formats.
Pricing
Free tier offers roughly 2 million requests per month at 50 requests per minute.
Best for
Developers who need IP geolocation or threat data in their app without paying for a commercial API tier.
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A free transactional email-sending API and SMTP toolkit for developers to plug into their own apps.
Free
What to know▼
How it works
A free email-sending API and SMTP toolkit for developers to send emails, test SMTP configurations, and integrate email features into their applications.
Pricing
Free.
Best for
Developers who need to add transactional email sending to their own apps.
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A screenshot API that turns any URL or HTML into a PNG, JPEG or PDF in one request, with a JSON-driven template mode for social share images. Built for developers; free for the first 200 screenshots a month.
Free
What to know▼
How it works
A single API call (curl + API key) turns any URL or HTML into a pixel-perfect PNG, JPEG or PDF screenshot; a JSON-plus-template mode also generates OG social share images without needing HTML/CSS skills.
What's different
No SDK or complex setup required, and screenshots run on a managed Chromium pool with no cold starts or timeouts.
Pricing
Free during beta — 200 screenshots per month, no credit card required.
Best for
Developers who need a screenshot or OG-image API without managing their own rendering infrastructure.
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An edge-native transactional email service for Next.js/Vercel/Cloudflare apps, with a self-hosted open-source option, for developers who don't want to run their own email infrastructure.
Open sourceSelf-hosted
What to know▼
How it works
An edge-native transactional email service for Next.js, Vercel and Cloudflare Workers, with an open-source self-host option.
What's different
Runs at the edge alongside the deploy rather than as a separate hosted email service, and can be self-hosted.
Best for
Developers on Next.js/Vercel/Cloudflare who want transactional email without running their own infrastructure.
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Packs an entire web app or documentation site into a single offline ZIP file that runs without breaking on JS/CORS restrictions, unlike typical offline export formats.
Works offlineOpen source
What to know▼
How it works
Maps a ZIP to memory and spins up a local HTTP server so the packed app 'thinks' it's online
What's different
Open source, avoids CORS breakage that plagues other offline formats
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Self-hosted, open-source REST API that exposes MyAnimeList data through 70+ read-only endpoints, requiring no database or API key.
Open sourceSelf-hosted
What to know▼
How it works
Exposes public MyAnimeList data through 70+ read-only JSON REST API endpoints covering anime, manga, characters, users, rankings, seasons, reviews, and recommendations; written in Go, runs as a single binary with no database, API key, OAuth flow, or MyAnimeList developer credentials required.
