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Head-to-head · Network Protocol Analyzers

Scapy vs Colasoft Capsa

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Scapy #3 in Network Protocol Analyzers 9.0/10 Free plan Free plan✓ 5 of 5 features Visit Scapy
Colasoft Capsa #10 in Network Protocol Analyzers 8.2/10 Free plan · 30-day trial Free planFree trial✓ 4 of 5 features Visit Colasoft

Scapy leads on 1 check, Colasoft Capsa on 0, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreScapy · 9.0/10
  • Free planboth
  • Free trialonly Colasoft Capsa
  • Most featuresScapy · 5 of 5

Scapy scores higher on our rubric for network protocol analyzers: 9.0 against 8.2 out of 10; our editors rank them #3 and #10.

On deployment, Scapy gives you Both where Colasoft Capsa offers Desktop. On capture sources, Scapy gives you Both where Colasoft Capsa offers Local. Scapy offers remote capture; Colasoft Capsa doesn't.

Scapy is the better fit for programmable packet crafting and analysis. Colasoft Capsa is the better fit for windows packet analysis with built-in diagnosis.

  • Scapy fits best

    Programmable packet crafting and analysis

  • Colasoft Capsa fits best

    Windows packet analysis with built-in diagnosis

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Scapy 9.0/10 Visit ↗ Colasoft Capsa 8.2/10 Visit ↗
At a glance
Editor score 9.0 8.2
Ranking #3 in Network Protocol Analyzers #10 in Network Protocol Analyzers
Best for Programmable packet crafting and analysis Windows packet analysis with built-in diagnosis
Pricing model Free Free plan + paid
Starting price Free plan $695 one-time
Free plan ✓ ✓
Free trial — 30 days
Deployment Desktop, Self-hosted Desktop
Platforms Windows, macOS, Linux Windows
Support Docs Email, Docs, Tickets
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Scapy 5/5 · Colasoft Capsa 4/5
PCAP support ✓ ✓
Traffic decryption ✓ ✓
CLI tools ✓ ✓
Remote capture ✓ (best) —
Flow analysis ✓ ✓
Specs
Deployment Both Desktop
Capture sources Both Local
Our review
Pros
  • Build and send custom packets with Python or the interactive shell.
  • Decode protocols and import or export PCAP files.
  • Analyze flows and support remote capture through Wireshark extcap.
  • Real-time capture with protocol, application, flow, and conversation analysis
  • Decrypts HTTPS traffic using RSA, PSK, or PMS log files
  • Automatic diagnosis, security alarms, replay, export, and CLI controls
Cons
  • Its workflow centers on Python and an interactive shell.
  • TLS decryption requires available session secrets.
  • It is a toolkit, not a hosted SaaS service.
  • Windows desktop deployment limits platform choice
  • Capture sources are local rather than remote
  • Paid editions use single-seat perpetual licenses
Our verdict

Scapy is an open-source Python program and library for sending, sniffing, dissecting, forging, and analyzing network packets. It is aimed at users who need programmable control over packet construction and inspection rather than a fixed…

Read the review →

Colasoft Capsa is a Windows-based network protocol analyzer for network engineers, administrators, developers, and networking students. It captures wired and wireless traffic in real time, decodes protocols, monitors hosts and…

Read the review →
  1. ScapyNetwork Protocol Analyzers 9.0Free plan
  2. Colasoft CapsaNetwork Protocol Analyzers 8.2Free plan · 30-day trial

Strengths and trade-offs

  • Scapy — where it wins

    • Build and send custom packets with Python or the interactive shell.
    • Decode protocols and import or export PCAP files.
    • Analyze flows and support remote capture through Wireshark extcap.

    Where it doesn't

    • Its workflow centers on Python and an interactive shell.
    • TLS decryption requires available session secrets.
    • It is a toolkit, not a hosted SaaS service.

  • Colasoft Capsa — where it wins

    • Real-time capture with protocol, application, flow, and conversation analysis
    • Decrypts HTTPS traffic using RSA, PSK, or PMS log files
    • Automatic diagnosis, security alarms, replay, export, and CLI controls

    Where it doesn't

    • Windows desktop deployment limits platform choice
    • Capture sources are local rather than remote
    • Paid editions use single-seat perpetual licenses
  • Scapy9.0/10 · Free plan

    A free, programmable toolkit for crafting, capturing, decoding, and analyzing packets.

    Visit ScapyFull verdict →
  • Colasoft Capsa8.2/10 · Free plan · 30-day trial

    A Windows-focused analyzer combining packet inspection, diagnosis, replay, and security analysis.

    Visit ColasoftFull verdict →

More comparisons

All network protocol analyzers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update