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FastAPI is an Open Source, modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.

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Open source alternative to Datadog

Which is more popular?
Based on our record, FastAPI should be more popular than SigNoz. It has been mentioned 315 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | fastapi.tiangolo.com | signoz.io |
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| Company | Startup from Colombia | — |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of FastAPI yet.
SigNoz is an open-source observability tool that helps you monitor your applications and troubleshoot problems. It provides traces, metrics, and logs under a single pane of glass. With SigNoz, you can do the following: Visualise Traces, Metrics, and Logs in a single pane of glass Monitor...
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FastAPI from the ground up
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External articles and on-site reviews we used to compare the two products.


When our backend team needs to build services for data parsing, aggregators, or high-load APIs, FastAPI is our absolute go-to choice. It completely lives up to its name-development speed is outstanding. The...
FastAPI, as the name hints, is a swift mover. Built on Starlette, it’s all about speed and performance with Python. Crafting API masterpieces at the speed of light, now that’s something.
Since its release in 2018, it has rapidly gained popularity due to its great performance and simplicity. In fact, according to PyPi Stats, FastAPI has over 9 million monthly downloads, surpassing even full-stack...
SigNoz can be a great Grafana alternative. SigNoz is also open-source, just like Grafana. So, if you want to self-host SigNoz, clone the GitHub repo to get started.
Recommendations tracked on public social media and blogs since March 2021.


Using FastAPI, FastStream, and dishka lets us follow Clean Architecture principles and almost avoid leaky abstractions. The prototype also used Pydantic and SQLAlchemy. I do not focus on them because these technologies are already... - Source: dev.to / 7 days ago
If your FastAPI app talks to a database through SQLAlchemy, chances are high you will meet it sooner or later. Not on your machine, of course. It shows up in production, after a few quiet hours, under load. And the reflex is always the... - Source: dev.to / 13 days ago
API: FastAPI with async SQLAlchemy, PostgreSQL 17 for data, Redis for caching and rate limits. The cache is invalidated by a single version counter bumped on every write: no fine-grained purging to manage. - Source: dev.to / 22 days ago
The entire SigNoz stack lives inside an isolated Docker network (verne_observability). The SigNoz API and UI container is additionally connected to an internal network (verne_internal). This allows our core API to proxy dashboard... - Source: dev.to / 2 months ago
So I built Why Did It Break. It's an investigation agent on top of SigNoz. You ask a question the way you'd ask a colleague ("why is checkout slow?") and the agent runs live queries against SigNoz, follows leads like an engineer would,... - Source: dev.to / 3 months ago
So what is DriftWatch? DriftWatch is an AI agent SDK that observes itself. Every skill (tool) Call and LLM step is traced via OpenTelemetry into SigNoz, and an AI layer on top of those traces flags Behavioral drift — shifts in... - Source: dev.to / 3 months ago
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