OpenAI Codex vs Pieces vs Liminary vs Knowledge Plane

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
OpenAI Codex
vs
Competitor 1
Pieces
Competitor 2
Liminary
Competitor 3
Knowledge Plane
Compare
4 tools · best value per row highlighted
Your tool OpenAI Codex
openai.com
A dedicated coding agent that writes and runs code for you
Remove
Competitor Pieces
pieces.app
Your personal AI coding assistant that remembers everything
Make main Remove
Competitor Liminary
liminary.io
Ever open a browser tab to find something you saved three months ago, only to spend ten minutes hunting through bookmarks
Make main Remove
Competitor Knowledge Plane
knowledgeplane.io
Engineering teams watch their AI tools hallucinate outdated project details
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
204.3Mvisits/mo
169.6Kvisits/mo
23.3Kvisits/mo
—
MoM change
▲ 3.6%
▼ 5.9%
▼ 18.4%
—
6-month growth
+0.3%
-16.0%
-10.4%
—
Global rank web
#212
#248,413
#1,028,276
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Avg. last 3 months
197.3M
176.5K
24.3K
—
Bounce rate lower is better
58%
44%
37%
0%
Pages / visit
3.0
2.2
2.0
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Visit duration
2m 31s
45s
51s
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Traffic sources
● Direct 81% · ● Referral 17%
● Direct 68% · ● Referral 30%
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—
OpenAI CodexPiecesLiminaryKnowledge Plane
066.6M133.2M199.7M266.3MOpenAI Codex · 266.3MOpenAI Codex · 225MOpenAI Codex · 210.1MOpenAI Codex · 191.2MOpenAI Codex · 203.7MOpenAI Codex · 195.7MOpenAI Codex · 203.1MOpenAI Codex · 190.4MOpenAI Codex · 197.2MOpenAI Codex · 204.3MPieces · 269.9KPieces · 295.6KPieces · 310.3KPieces · 237KPieces · 202KPieces · 195.3KPieces · 169.9KPieces · 179.9KPieces · 180.1KPieces · 169.6KLiminary · 37.2KLiminary · 16KLiminary · 26KLiminary · 18.1KLiminary · 28.2KLiminary · 21.2KLiminary · 28.5KLiminary · 23.3K10K100K1M10M100M1BOpenAI Codex · 266.3MOpenAI Codex · 225MOpenAI Codex · 210.1MOpenAI Codex · 191.2MOpenAI Codex · 203.7MOpenAI Codex · 195.7MOpenAI Codex · 203.1MOpenAI Codex · 190.4MOpenAI Codex · 197.2MOpenAI Codex · 204.3MPieces · 269.9KPieces · 295.6KPieces · 310.3KPieces · 237KPieces · 202KPieces · 195.3KPieces · 169.9KPieces · 179.9KPieces · 180.1KPieces · 169.6KLiminary · 37.2KLiminary · 16KLiminary · 26KLiminary · 18.1KLiminary · 28.2KLiminary · 21.2KLiminary · 28.5KLiminary · 23.3KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
Freemium
Freemium
Starting price
$20per month · free tier available
$18.99per month
$29per month · free tier available
$19per month · free tier available
Free tier
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Free trial
–
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API access
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–
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Plans
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Pro $18.99/moEnterprise $22.99/mo
Explorer FreePro $29/moTeam $50/mo
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Capabilities input → output
Input
CodeText
AudioCodeText
DocumentsTextWeb pages
CodeDocumentsText
Output
Code
Text
Text
Text
Skill level
Advanced
Intermediate
Intermediate
Intermediate
Categories
Development & CodeAI Code ReviewAI Coding Assistant
Development & CodeEducation & LearningProductivity & OfficeAI Assistant+2 more
Education & LearningAI Knowledge Management
Education & LearningAI Knowledge Management
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
9
5
6
12
Digital information management
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Code documentation
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Coding
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Knowledge bases
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Agents
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Bookmarking
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Code snippets
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Knowledge graphs
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Agent memory
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Chrome extensions
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Developer tools
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GitHub automation
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GitHub pull requests
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–
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Knowledge
–
–
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Knowledge maps
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Knowledge sourcing
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Code reviews
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Codebase q a
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Debugging
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Development
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Knowledge exchange
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Knowledge exploration
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Note taking
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Slack
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Terminal
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Web search summaries
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 1
▲ 0
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.