Dev tools · alternatives · 2026

24 alternatives to Visual debugger for Rails system tests

Hey all, I've been working on this side project to get a Cypress.io-like experience, but for Ruby developers. It's plug-n-play with Capybara system tests, with the following features: - visualize assertions/commands as they happen - view all API requests, errors, and logs in the timeline - pause/continue on any step - rewind through history with a recorded video This is brand new, so looking for people to start trying it out and leave feedback.

This visual debugger for Rails system tests integrates with Capybara to provide Cypress.io-like debugging capabilities for Ruby developers. It displays assertions and commands in real-time, shows API requests and… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Visual debugger for Rails system tests launched in 2024; newer entries below may have overtaken it.

1. 1
   Cyperful▲79

   Visual debugger for Rails system tests

   2024 · github.com · its alternatives →

2. 2
   Debugger that generates video visualizations for algorithm learning▲102

   A simple Python debugger and profiler that generates animated visualizations of program flow, useful for algorithm learning. - CCExtractor/vardbg

   2020 · github.com · its alternatives →

3. 3
   Letting LLMs Run a Debugger▲147

   Hey HN, I just built an experimental VSCode extension called LLM Debugger. It’s a proof-of-concept that lets a large language model take charge of debugging. Instead of only looking at the static code, the LLM also gets to see the live runtime state—actual variable values, function calls, branch decisions, and more. The idea is to give it enough context to help diagnose issues faster and even generate synthetic data from running programs. Here’s what it does: * Active Debugging: It integrates with Node.js debug sessions to gather runtime info (like variable states and stack traces). *…

   2025 · github.com · its alternatives →

4. 4
   Leaping – Debug Python tests instantly with an LLM debugger▲120

   Hi HN! We’re Adrien and Kanav. We met at our previous job, where we spent about a third of our lives combating a constant firehose of bugs. In the hope of reducing this pain for others in the future, we’re working on automating debugging. We’re currently working on a platform that ingests logs and then automatically reproduces, root causes and ultimately fixes production bugs as they happen. You can see some of our work on this here - https://news.ycombinator.com/item?id=39528087 As we were building the root-cause phase of our automated debugger, we realized that we developed…

   2024 · github.com · its alternatives →

5. 5
   BetterBugs.io▲669

   Capture bugs, record sessions, and fix with AI

   2024 · betterbugs.io · its alternatives →

6. 6
   Get Rails performance metrics into Chrome Dev Tools▲136

   Bring Rails server-side performance metrics 📈 to Chrome's Developer Tools via the Server Timing API. Production Safe™. - scoutapp/ruby_server_timing

   2018 · github.com · its alternatives →

7. 7
   Zipy▲339

   Debug instantly with session playback and monitoring in one

   2022 · zipy.ai · its alternatives →

8. 8
   We’re open-sourcing our session replay tool▲408

   Hey HN! We’re open-sourcing highlight.io (https://github.com/highlight/highlight), a session replay and error monitoring tool. Highlight.io gives you a high-precision video-like replay of what users are doing when an error or exception occurs in your web app, along with a full-fledged error monitoring experience (similar to bugsnag, rollbar, etc..). The main value prop of highlight.io is that we help you understand the full context surrounding an error and allow you to drill down to the code path that a user invoked (i.e user clicked button X, sent network request Y, and…

   2023 · github.com · its alternatives →

9. 9
   Session Replays by Requestly▲518

   Debug web apps faster with record & replay

   2023 · requestly.com · its alternatives →

10. 10
    Timber.io▲318

    Log better. Solve problems faster.

    2017 · timber.io · its alternatives →

11. 11
    Luzo▲122

    Design and debug API workflows visually

    Mar 2026 · luzoapi.vercel.app · its alternatives →

12. 12
    A syntax highlighter for Git and diff output, written in Rust▲261

    A syntax-highlighting pager for git, diff, grep, rg --json, and blame output - dandavison/delta

    2020 · github.com · its alternatives →

13. 13WM
    We made an MCP server so Cursor can debug Node.js on its own▲139

    2025 · npmjs.com · its alternatives →

14. 14
    Hurl – Run and test HTTP requests with plain text, curl and Rust▲223

    Hurl, run and test HTTP requests with plain text and curl. Hurl can run fast automated integration tests.

    2021 · hurl.dev · its alternatives →

15. 15
    DeploySentinel▲73

    Debug flakey & failed Cypress tests from CI 10x faster

    2022 · hyperdx.io · its alternatives →

16. 16
    Replay for Test Suites▲117

    Fix flaky browser tests once and for all

    2023 · replay.io · its alternatives →

17. 17RA
    Rbkit – a low-pause profiler for ruby▲67

    2015 · rbkit.codemancers.com · its alternatives →

18. 18
    NetworkSpy▲89

    HTTP(s) proxy debugger with custom viewer

    Jun 2026 · networkspy.app · its alternatives →

19. 19
    An open source performance monitoring tool▲135

    Hey HN. We’re Jay and Vadim from Highlight.io (https://highlight.io). We’re building an open source [1] monitoring platform for web applications. Today we’re excited to be sharing a performance tool we’ve been working on, which helps you inspect the latency of code execution from the client to the server. As engineers at past startups, we often had to debug slow queries, poor load times, inconsistent errors, etc... While tools like Jaegar [2] helped us inspect server-side performance, we had no way to tie user events to the traces we were inspecting. In other words, although we had…

    2024 · github.com · its alternatives →

20. 20
    Rust based AWS Lambda Logs Viewer (TUI)▲57

    My first Rust program with support from Cursor :)). few days for idea. 1 night for "talk and fight" with Cursor

    2024 · github.com · its alternatives →

21. 21
    Ruby Heap Viz – An interactive Ruby object graph visualization▲51

    An interactive Ruby Object Graph Visualization. Contribute to mattbaker/ruby-heap-viz development by creating an account on GitHub.

    2014 · github.com · its alternatives →

22. 22
    I built a tool to un-dumb Claude Code's CLI output (Local Log Viewer)▲69

    Hi HN, I built this because I got tired of the Claude Code CLI hiding details from me. Recent updates have replaced critical output with summaries like "Read 3 files" or "Edited 2 files". To see what actually happened, I was forced to use `--verbose`, which floods the terminal with unreadable JSON and system prompts. I wanted a middle ground: *Full observability without the noise.* `claude-devtools` is a local Electron app that tails the session logs in `~/.claude/` to reconstruct the execution trace in real-time. *Unlike wrappers, it solves the visibility gap in your native…

    Feb 2026 · github.com · its alternatives →

23. 23
    Inspect – DevTool to debug Safari and WebViews on iOS devices▲75

    Agent-first mobile web debugging for iOS and Android. Give Claude, Codex, Cursor, and other coding agents real-device DOM, console, network, and screenshots.

    2020 · inspect.dev · its alternatives →

24. 24
    RoRvsWild▲84

    Performances and errors monitoring for Ruby on Rails apps.

    2017 · rorvswild.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →