$0
Price
Free, open source
Report
Should I Use I2P - The Invisible Internet Project?
I2P is a fully encrypted private network layer. Protect your online activity from surveillance and censorship with built-in end-to-end encryption.
Depends
DependsWorth using only if you specifically need anonymous hosting or censorship-resistant P2P and can handle technical setup — it costs nothing.
Free, mature anonymity network — great for anonymous hosting and P2P, overkill and awkward for everyday private browsing.
Confidence: Medium
Yes
Free tier
Entire project is free
1
Known CVEs
CVE-2020-13431, Windows privesc
Yes
Active development
Releases through Jul 2026
Value for money
5
Completely free and open source
Ease of use
2
Technical setup; users call it impractical
Feature depth
4
Anonymous hosting, P2P, encrypted apps built in
Security posture
3
Strong crypto; real CVE and de-anonymization research
Pros
Cons
- Users say it is not practical or convenient for everyday use⁸
- Anonymity trades off reliability, bandwidth, and latency11
- Windows installer had a local privilege escalation vulnerability⁴
- Hidden services are active large-scale de-anonymization research targets⁵
- Dark web association can draw unwanted scrutiny
Gotchas
Best for
- Journalists and activists in censored regions
- Anonymous site and service hosting
- Privacy-focused P2P file sharing
- Security researchers
Not for
- Casual users wanting simple private browsing — use Tor
- Businesses needing vendor SLAs and support contracts
- Anyone wanting a drop-in VPN replacement
- Non-technical users unwilling to run and update a router client
Pricing
I2P
$0
- Full anonymized network layer
- Anonymous hosting (eepsites)
- Community support only
Security
Encryption by design, but not flawless: one Windows privesc CVE and ongoing de-anonymization research.
- CVE-2020-13431Local privilege escalation in the I2P Windows installer.⁴
- Large-scale de-anonymization of hidden services (2025)Published research demonstrates de-anonymization attacks against I2P hidden services.⁵
- 2014 anonymizing flawA serious flaw in I2P's anonymizing layer was publicly reported in 2014.⁶
What users say
Long-time users call it a mature, self-scaling anonymity network but inconvenient and impractical for everyday use.
“I2P, The Invisible Internet Project is a self-contained, self-scaling anonymizing network that's been around as long as Tor.”
“So every single user is also a small server. For now, it's not practical or convenient enough for almost any sort of”
“because it's far superior to Tor by all means.”
Alternatives
Compare I2P - The Invisible Internet Project with each alternative.
Tor Browser
Easier anonymous browsing with a much larger user base
Whonix
Privacy-hardened OS with Tor isolation built in
I2P - The Invisible Internet Project vs WhonixMullvad VPN
Guess: simpler paid privacy for everyday devices
I2P - The Invisible Internet Project vs Mullvad VPNFull analysis
Based on 20+ public sources; no enterprise review data or vendor pricing exists — the project is free and community-run.
Sources
official
- I2P Documentationi2p.netofficial
- I2P download - SourceForgesourceforge.netofficial
- CVE-2020-13431 I2P Windows Local Privilege Escalationblazeinfosec.comsecurity
security
- A serious flaw in I2Pthetechportal.comsecurity
review
- Reddit r/thehatedone: what is i2p?reddit.comreview
- What is I2P? - Nymnym.comreview
- Tor vs I2P: How the Two Anonymous Networks Differdeepstrike.ioreview
- I2P - Digital Citizenship and Citizenship Educationdcssproject.netreview
- Enemy Unseen - Bitdefender on the Dark Webbitdefender.comsecurity
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