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Tech riderRev. 4 Oct 2026

Scalene

Ch 057.2of 29 Profiling Software
  1. 1Runs onBrowser, Linux, Mac, Web, Windows
  2. 2CostsFree plan
  3. 3Profiling modessampling
  4. 4Supported languagesPython
  5. 5CPU profilingYes
  6. 6Memory profilingYes
  7. 7Thread profilingYes
  8. 8Deployment modeldesktop
8 lines stated Written from the maker's own pages: github.com
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Overview

Scalene is ranked #5 of 29 in profiling software on Specifiction. It runs on Browser extension, Linux, macOS, Web, Windows. There is a free plan.

Scalene plans and pricing

All plans
Scalene Free Open-source Python profiler · install via pip or conda github.com · 4 Oct 2026

Compared on profiling software

Profiling modes
samplinggithub.com
Supported languages
Pythongithub.com
CPU profiling
Yesgithub.com
Memory profiling
Yesgithub.com
Thread profiling
Yesgithub.com
Deployment model
desktopgithub.com

Facts

Purpose
Scalene profiles Python programs for CPU, GPU, and memory use and provides AI-powered optimization proposals.github.com · 4 Oct 2026
Detailed profiling
It reports performance at line and function level and separates Python time from native-code and system time.github.com · 4 Oct 2026
Memory analysis
It reports per-line memory use, distinguishes Python from native allocations, and identifies lines with likely memory leaks.github.com · 4 Oct 2026
GPU support
GPU profiling reports time on NVIDIA-based systems.github.com · 4 Oct 2026
Async profiling
Async profiling attributes wall-clock await time to the line where a coroutine is suspended and reports mean and peak concurrent waiters.github.com · 4 Oct 2026
Stack views
Its GUI can display stitched Python and native call stacks, memory flame charts, and a timeline.github.com · 4 Oct 2026
AI providers
For optimization suggestions, Scalene lists Amazon Bedrock, Microsoft Azure, OpenAI, and local models via Ollama as supported providers.github.com · 4 Oct 2026
Local processing
The web interface processes profiles locally and works offline; the project says API keys passed from environment variables are sent only to the local browser session and are never written into the HTML file.github.com · 4 Oct 2026
Interfaces
Scalene can be used from the command line, a web-based GUI, a Visual Studio Code extension, or Jupyter notebooks.github.com · 4 Oct 2026
Install platforms
The project lists macOS, Linux, Windows, and Windows Subsystem for Linux 2 as supported installation platforms.github.com · 4 Oct 2026
Windows note
Starting with Scalene 2.0, Windows supports full memory profiling; troubleshooting may require the Visual C++ Redistributable.github.com · 4 Oct 2026
Performance overhead
The README says profiling overhead is typically no more than 10–20%, and often less.github.com · 4 Oct 2026
License
The repository identifies its license as Apache-2.0.github.com · 4 Oct 2026
Support
The project links to a Scalene community Slack for community discussion.github.com · 4 Oct 2026

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