Dev tools · alternatives · 2026
24 alternatives to Baldur
Circuit breaker and retry for Python, with an ops console
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
BreakerMachines is a production-ready circuit breaker for Ruby/Rails with built-in async/fiber support, fallback chains, and rich monitoring. Unlike existing gems, it handles modern Ruby's fiber scheduler and avoids dangerous thread timeouts.
2025 · github.com · its alternatives →
- 2
Retry a command with exponential backoff and jitter (+ Starlark expressions) - dbohdan/recur
2024 · github.com · its alternatives →
- 3
Hi HN! I built Oxyde because I was tired of duplicating my models. If you use FastAPI, you know the drill. You define Pydantic models for your API, then define separate ORM models for your database, then write converters between them. SQLModel tries to fix this but it's still SQLAlchemy underneath. Tortoise gives you a nice Django-style API but its own model system. Django ORM is great but welded to the framework. I wanted something simple: your Pydantic model IS your database model. One class, full validation on input and output, native type hints, zero duplication. The query API is…
Mar 2026 · github.com · its alternatives →
- 4
Hi HN, Here's a tool I wrote for retrying fallible commands. Nothing groundbreaking here, this is a tool that's been made many times (and several have been submitted to Show HN). Though this one does have a more comprehensive feature set than most. I hope one or two people will find it useful. I wrote `attempt` for two reasons: - To have a more featureful alternative to `wait-for-it.sh` for use in Docker Compose. Specifically to apply migration scripts to a database that may not be up yet. I wanted to be able to inspect the error messages from my migration tool & retry on connection errors.…
2025 · github.com · its alternatives →
- 5
Hi! I've built this because I kept reaching for Celery for simple scheduled tasks and it felt like overkill. I just needed "run this function every hour" or "daily at 9am", not distributed workers. So it's decorators for scheduling (@scheduler.every(5).minutes, @scheduler.daily.at("09:00")), state saves to JSON so jobs survive restarts, and there's an optional FastAPI dashboard if you want to see what's running. No Redis, no message broker, runs in-process with your app. Trade-off is it's single process only — if you need distributed workers, stick with Celery.
Jan 2026 · github.com · its alternatives →
- 6
Tornado HTTP/2 Client. Contribute to vladmunteanu/th2c development by creating an account on GitHub.
2018 · github.com · its alternatives →
- 7
- 8TY
Hi HN, Some misbehaving networks drop WireGuard packets either by accident or on purpose. Commonly the latter is done with simple DPI rules that block the handshake initiation [1], but it could be applied to other message types as well. We thought it would be great if there was tool for folks to use as a quick litmus test to see if this happening for them, without having to configure a client to send data through a random, functional WireGuard tunnel to an untrusted remote host. So we built probe.sh. How it works: - The probe.sh web app is an Elixir Phoenix app that spawns a few gen_udp…
2024 · probe.sh · its alternatives →
- 9
A cross-language, zero-copy coroutine observability framework based on the cTP shared-memory protocol, utilizing lock-free ring buffers for ultra-low overhead state tracing. - lixiasky-back/coroTracer
Mar 2026 · github.com · its alternatives →
- 10
Dead easy interface for executing many HTTP requests asynchronously. Also provides helper functions for executing embarrassingly parallel async coroutines. - joshlk/many_requests
2020 · github.com · its alternatives →
- 11
Hey everyone, I built reaktiv, a small reactive signals library for Python, inspired by Angular’s reactivity model. It lets you define Signals, Computed Values, and Effects that automatically track dependencies and update efficiently. The main focus is async-first reactivity without external dependencies. Here is an example code: ``` import asyncio from reaktiv import Signal, ComputeSignal, Effect async def main(): count = Signal(0) doubled = ComputeSignal(lambda: count.get() * 2) async def log_count(): print(f"Count: {count.get()}, Doubled: {doubled.get()}") Effect(log_count).schedule()…
2025 · github.com · its alternatives →
- 12
The Requests Stampede library is a wrapper around the Requests library that provides request retry logic and backoff delays. - PatrickMurray/RequestsStampede
2021 · github.com · its alternatives →
- 13
Hey HN! I'm Rodrigo, I run distributed systems across a few countries. I built Openfuse because of something that kept bugging me about how we all do circuit breakers. If you're running 20 instances of a service and Stripe starts returning 500s, each instance discovers that independently. Instance 1 trips its breaker after 5 failures. Instance 14 just got recycled and hasn't seen any yet. Instance 7 is in half-open, probing a service you already know is dead. For some window of time, part of your fleet is protecting itself and part of it is still hammering a dead dependency and timing out,…
Feb 2026 · openfuse.io · its alternatives →
- 14
A declarative library to make blocking code play nicely with the tornado ioloop - bobpoekert/tornado-threadpool
2012 · github.com · its alternatives →
- 15
Nathan here, one of the people who built Retrace. Happy to answer technical questions. Retrace records a CPython application's interactions with the nondeterministic outside world i.e. network, DB, filesystem, time, randomness, subprocesses, and lets you replay that execution locally and deterministically. The goal is to take a production failure and open the same execution in VS Code, with the ability to step forwards and backwards through the replay. The core idea is to record boundary crossings rather than tracing every Python line in production. External calls are recorded as…
May 2026 · github.com · its alternatives →
- 16
OP here. I built RepoReaper to solve code context fragmentation in RAG. Unlike standard chat-with-repo tools, it simulates a senior engineer's workflow: it parses Python AST for logic-aware chunking, uses a ReAct loop to JIT-fetch missing file dependencies from GitHub, and employs hybrid search (BM25+Vector). It also generates Mermaid diagrams for architecture visualization. The backend is fully async and persists state via ChromaDB. Link: https://github.com/tzzp1224/RepoReaper
Jan 2026 · github.com · its alternatives →
- 17
Local AI agent guardrails, budgets, & circuit breakers.
Jun 2026 · stackmint.ai · its alternatives →
- 18
Author here. I started seapie as a reaction to pdb's command-driven interface in 2019. I wanted a breakpoint to simply mean 'open a Python REPL here', with debugging functionality layered on top instead of replacing the REPL. `seapie.breakpoint()` opens a working `>>>` REPL at the current execution state. Any changes to variables or function definitions persist. Debugger state is exposed via built-ins (e.g. `_magic_`), and stepping/frame control/etc is handled via small `!commands`. I've been using this regularly in my own work for a few years now. Happy to answer questions or hear…
Jan 2026 · github.com · its alternatives →
- 19
Catch, edit, and retry failed webhooks & cron jobs
Jun 2026 · underlayer.dev · its alternatives →
- 20
We've all written and rewritten code that catches exceptions and then retries to do the same procedure again. Here's a python library to help you eliminate this code from your business logic, keeping your code cleaner and your fingers more energetic.
2013 · github.com · its alternatives →
- 21CA
2014 · engineering.harrys.com · its alternatives →
- 22
I'm an "ideas person" who messes around with AI on a low budget. I got tired of watching my tokens vanish and context windows filling up while agents fumbled around trying to find the right thing. Agents don't flail like they used to with shell tools, but there are still weak/blind spots and back-and-forth episodes — especially when using tools in combination/sequence. So I built "tilth" today. Or rather, AI built it — every line is Opus 4.6. I spent a lot of my precious tokens getting it to "not shit" (at least several of the different vendors' AI overlords assure me it's not…
Feb 2026 · github.com · its alternatives →
- 23
A reverse proxy that detects recursive agent loops and enforces spend caps in volatile memory, without retaining prompt payloads.
17d ago · circuit-breaker-sage.vercel.app · its alternatives →
- 24
Workflow orchestrator written in rust. Contribute to RainingComputers/Flowmium development by creating an account on GitHub.
2024 · github.com · its alternatives →
Also compare
- BreakerMachines – Modern Circuit Breaker for Rails with Async Support alternatives
- Retry a command with exponential backoff and jitter (+ Starlark exprs) alternatives
- Oxyde – Pydantic-native async ORM with a Rust core alternatives
- Attempt – A CLI for retrying fallible commands alternatives
- FastScheduler – Decorator-first Python task scheduler, async support alternatives
- Asynchronous HTTP/2 client for Python 2.7 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 →