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A WordPress safety layer that checks CSS before saving, warning about risky changes and blocking critical errors so a small CSS mistake can't silently break a site.
What to know▼
How it works
Checks CSS before save, warns on risky changes, blocks critical errors, keeps recoverable backups.
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A lightweight error-tracking platform for JavaScript applications that captures browser and Node.js errors via an SDK into a developer dashboard, built for indie developers and small teams.
What to know▼
How it works
Add a small SDK, capture errors from browser or Node.js apps, and view them through a developer-focused dashboard.
Best for
Indie developers and small teams who want error tracking without a complex monitoring setup.
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Lets teams run scheduled browser jobs — screenshots, PDF/Markdown/HTML exports and no-code checks for pricing, signup and UI flows — without maintaining their own Playwright setup.
Can export my data
What to know▼
How it works
Runs scheduled browser jobs to capture screenshots, export pages to PDF/Markdown/HTML, and run no-code checks on pricing, signup, docs and UI flows, keeping outputs, baselines and alerts in one workspace.
What's different
Replaces maintaining your own Playwright infrastructure.
Best for
Teams that need recurring page checks and exports without running browser automation themselves.
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Frames your web page inside a real iPhone, Pixel, Galaxy or iPad simulation in your browser — true viewport, pixel density and touch signals, running 100% locally so localhost and logged-in pages just work.
Free
What to know▼
How it works
Runs entirely in-browser against 93 verified device profiles; includes screenshots, recording, side-by-side compare and environment spoofing.
Pricing
Free on Chrome, Edge and Firefox.
Best for
Developers and QA testing responsive design without physical devices.
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A bug-capture tool that logs console/network/video and routes fixes through an MCP workflow into Jira, Linear or Slack, plus free WCAG accessibility scans to reduce legal exposure.
Watch out · Also includes a free instant WCAG scan (axe-core + IBM Equal Access) plus human-backed accessibility audits, without overlay band-aids.
Free
What to know▼
How it works
Captures bugs with console/network logs and video, then routes them through an MCP workflow that can auto-trigger a fix and open a PR; integrates with Jira, Linear, and Slack.
Pricing
Free tier included.
Watch out
Also includes a free instant WCAG scan (axe-core + IBM Equal Access) plus human-backed accessibility audits, without overlay band-aids.
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A Windows app that turns real screen actions into annotated step-by-step guides with local OCR and no cloud upload, aimed at IT support, helpdesk and training teams.
Works offlineNo subscriptionCan export my data
What to know▼
How it works
A local-first Windows app for turning real desktop actions into professional visual guides: it captures clicks and active windows with consent, offers a structured editor, annotations, blur, and local OCR, and exports to PDF, DOCX, HTML, PowerPoint, or Markdown.
What's different
Keeps screenshots, OCR, and documents entirely local on the user's PC, with no SaaS account and no keystroke logging, unlike cloud-based alternatives.
Pricing
Available on Microsoft Store with a one-time lifetime license.
Best for
IT support, helpdesk, QA, operations, and training teams that need step-by-step documentation from real desktop actions.
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A frontend developer job simulation with realistic tasks and a verified certificate for a portfolio.
What to know▼
How it works
Presents realistic frontend development tasks inspired by real engineering teams, including building responsive UI, fixing bugs and reviewing code, ending with a verified certificate.
Best for
People building a portfolio to prove frontend development skills.
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A terminal tool that groups similar Go goroutines and shows where a running application is spending its time, instead of manually scrolling through stack traces.
What to know▼
How it works
Attaches to a running Go application and groups similar goroutines in an interactive terminal UI.
Best for
Go developers debugging applications with large numbers of goroutines.
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GitHub bot for API teams that blocks breaking OpenAPI contract changes from merging instead of catching them after they break client integrations.
What to know▼
How it works
A GitHub App that checks OpenAPI 3.x JSON or YAML contracts on every pull request and posts a native GitHub Check, catching removed endpoints, responses, required inputs, and incompatible schema changes before merge.
What's different
Works without adding a workflow file, unlike typical CI-based contract checks.
Pricing
Founding Starter offer of £1 for the first month, then £19/month.
Best for
API teams that want breaking OpenAPI changes blocked before they merge instead of caught after they break client integrations.
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A cozy tower-defense game for iPhone and iPad where you plant pest-control gear to stop bugs reaching your veggies; free for the first 8 maps, then a $0.99 one-time unlock for the rest.
Pay onceNo tracking
What to know▼
How it works
A cozy tower-defense game where bugs march toward your veggies and you plant pest-control gear like pellet guns, sprays, zappers and Venus traps to stop them, across 30 maps plus an Endless mode.
Pricing
Free for the first 8 maps; a one-time $0.99 unlocks everything.
Best for
iPhone and iPad players wanting a casual, low-commitment tower defense game.
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A local command-line runner for LeetCode-style coding problems, built around open test suites you can inspect and run yourself instead of a hosted judge.
What to know▼
How it works
A local command-line LeetCode-style problem runner built in Haskell: it takes a solution file, matches it to a problem manifest, builds a language-specific harness, and judges the result locally via a pluggable execution backend.
What's different
Tests and runtime templates live in the repo and are open to inspect, instead of running on a hosted, closed judge.
Best for
Developers who want to run and inspect LeetCode-style coding tests locally rather than on a hosted judge.
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A Python-based simulation tool for hardware engineers to model and stress-test physical systems, like motors, batteries, and drivetrains, before building them, refining the model with real bench data over time.
What to know▼
How it works
Lets engineers compose a hardware system model in Python and stress-test it in software; real bench measurements can be fed back to improve the model for future iterations.
Best for
Hardware engineers who want to catch failure modes (overheating, battery sag, coupling issues) before spending time and BOM cost on a physical build.
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Bundles 10 JavaScript developer tools, including a code analyzer, performance estimator, visualizer, AST explorer, and refactoring engine, into one no-signup platform.
No sign-up
What to know▼
How it works
Includes a 20+-rule code analyzer, complexity/performance estimator, interactive visualizer for closures and async code, AST explorer, a 5-mode refactoring engine, a bug-hunting game, and interview prep from junior to staff level.
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A desktop packet-capture and network-debugging tool for Windows and macOS that can mirror traffic live from a paired iOS or Android app, keeping all data on-device. For developers.
Watch out · All data stays on the user's device and is never uploaded to a server.
Data stays with you
What to know▼
How it works
A desktop packet capture and network debugging tool for Windows and macOS that captures and decrypts HTTP/HTTPS traffic, inspects JSON/XML/HTML, compares requests/responses, and replays requests to reproduce bugs. Pairs with a mobile PCP app to mirror traffic live from Android and iOS devices.
What's different
Mirrors mobile device traffic to the desktop in real time without requiring root or jailbreak on the mobile device.
Best for
Developers debugging network traffic across desktop and mobile apps.
Watch out
All data stays on the user's device and is never uploaded to a server.
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A developer tool for building mock API endpoints and sandboxes — simulate responses, trigger webhooks, inspect logs — so frontend, QA and demo work isn't blocked waiting on real backend APIs.
What to know▼
How it works
Lets teams create mock API endpoints and sandboxes from one workspace — simulate responses and edge cases, trigger webhooks, and inspect request logs.
Best for
Frontend, QA, and demo work that's blocked waiting on production APIs that aren't ready yet.
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Lets hardware, firmware and software teams define executable hardware behavior so they can start integration work before physical hardware exists, instead of maintaining fragile simulators.
What to know▼
How it works
Lets hardware, firmware and software teams define executable hardware behavior models so they can begin integration and testing work before physical hardware is fabricated.
What's different
Positioned as an alternative to rewriting applications or maintaining fragile simulators for pre-hardware development.
Best for
Engineering teams who need software, firmware and test work to start before physical hardware is available.
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A tool for building and running automated integration tests across many API types — HTTP, SOAP, databases, message queues and more — for QA and engineering teams, not a hosted API itself.
Watch out · Data is saved offline on your local machine rather than in the cloud.
FreeWorks offline
What to know▼
How it works
A tool for building and running automated integration test cases across many API types — HTTP, SOAP, relational databases (Oracle, SQL Server, PostgreSQL, H2), JMS, FTP(S), SFTP, AMQP, MQTT, IBM MQ and IBM ACE. Includes HTTP stubs/mock servers, data-driven testing, endpoint management and Git-based team collaboration.
What's different
Covers many non-HTTP protocols and database types, not just REST/HTTP APIs.
Pricing
Free.
Best for
QA and engineering teams doing integration, microservices, ESB or SOA testing who need low-code test authoring.
Watch out
Data is saved offline on your local machine rather than in the cloud.
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An offline QA workspace for recurring marketing reports that recalculates KPIs from a CSV and requires human sign-off before sending reports to clients.
No sign-upWorks offline
What to know▼
How it works
Drop in a CSV to recalculate KPIs, summarize channels, and flag missing or suspicious data before requiring human sign-off.
What's different
No account, upload, or tracking.
Best for
Agencies and teams doing QA on client-facing marketing reports.
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GitHub app that automatically posts visual diffs of BPMN and DMN diagram changes on pull requests.
Nothing to install
What to know▼
How it works
A GitHub app that automatically posts a visual diff of BPMN and DMN diagram changes on every pull request, showing added, removed, and moved elements and properties.
What's different
No setup or manual file upload required — fully automated on PRs.
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Generates realistic fake data across 120+ fields and exports to CSV, Excel, JSON, SQL, XML or YAML — a free browser tool for developers testing forms or databases, no signup needed.
FreeNo sign-upCan export my data
What to know▼
How it works
Generates realistic fake data across 120+ fields and 15 templates, exporting to CSV, Excel, JSON, SQL, XML or YAML, running entirely in the browser.
Pricing
Free, no signup.
Best for
Developers who need placeholder data for testing forms or databases without creating an account.
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An open-source desktop browser that gives developers and QA engineers isolated cookie and session tabs for testing multiple user roles at once, instead of juggling multiple browsers or profiles.
Open source
What to know▼
How it works
Every tab has independent cookies, storage and authentication, so admin, manager, customer and other roles can be tested simultaneously in one window.
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A Chrome extension that bundles a screenshot or recording with console logs, network requests and environment info into one bug report, entirely on your machine. Built for developers and QA.
Works offlineData stays with youCan export my data
What to know▼
How it works
A Chrome extension that captures a screenshot or video recording along with console logs, network requests and environment info, bundling them into one paste-ready bug report; can export a video to webm or a full HTML report.
What's different
Runs 100% locally — nothing leaves your machine.
Best for
Developers and QA testers who need a complete, shareable bug report without manually collecting logs and screenshots.
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Records a visual test once and replays it across desktop, tablet and mobile to catch UI regressions against your design baselines — runs locally so credentials never leave your machine.
What to know▼
How it works
Records a visual test once against Figma, a design system, or approved baselines, then replays it across desktop, tablet and mobile to catch UI regressions.
What's different
Runs on your machine so credentials never leave it.
Best for
Developers or QA teams wanting automated visual regression testing without sending credentials to the cloud.
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Diffs your design against your live site and tells you which differences are real bugs versus noise — upload a design, paste a URL, get a plain-English report, no CI/CD or SDK setup; built for freelancers and small agencies.
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Advisory-first Git hooks that catch workflow mistakes before your first push and suggest the exact safe command — local-only, telemetry-free, open source, for JavaScript/TypeScript.
