OpenAI API vs Stack AI vs OpenRouter vs Azure AI Foundry

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

Your tool
OpenAI API
vs
Competitor 1
Stack AI
Competitor 2
OpenRouter
Competitor 3
Azure AI Foundry
Compare
4 tools · best value per row highlighted
Your tool OpenAI API
platform.openai.com
The API powering the AI ecosystem
Remove
Competitor Stack AI
stack-ai.com
Connect AI models visually
Make main Remove
Competitor OpenRouter
openrouter.ai
Every model, one endpoint
Make main Remove
Competitor Azure AI Foundry
azure.microsoft.com
Azure AI Foundry, now branded Microsoft Foundry, is Microsoft's enterprise platform for building, grounding and governing AI applications and agents.
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
15.2Mvisits/mo
6.3Kvisits/mo
22Mvisits/mo
—
MoM change
▲ 4.6%
▼ 57.9%
▲ 14.6%
—
6-month growth
-2.4%
-93.7%
+39.6%
—
Global rank web
—
#1,700,092
#2,023
—
Avg. last 3 months
15.2M
13.9K
19.5M
—
Bounce rate lower is better
34%
39%
32%
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Pages / visit
5.4
1.8
7.7
—
Visit duration
3m 56s
14s
6m 13s
—
Traffic sources
● Direct 82% · ● Referral 15%
—
● Direct 89% · ● Referral 10%
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OpenAI APIStack AIOpenRouterAzure AI Foundry
05.5M11M16.5M22MOpenAI API · 18.7MOpenAI API · 16.7MOpenAI API · 16.5MOpenAI API · 15.6MOpenAI API · 15.9MOpenAI API · 15.1MOpenAI API · 15.7MOpenAI API · 14.6MOpenAI API · 15.2MStack AI · 143.4KStack AI · 153.7KStack AI · 167.9KStack AI · 160KStack AI · 99.4KStack AI · 35.9KStack AI · 17.4KStack AI · 20.6KStack AI · 14.9KStack AI · 6.3KOpenRouter · 7.5MOpenRouter · 8.6MOpenRouter · 8.4MOpenRouter · 11.2MOpenRouter · 15.8MOpenRouter · 17.9MOpenRouter · 16.8MOpenRouter · 17.3MOpenRouter · 19.2MOpenRouter · 22M1K10K100K1M10M100MOpenAI API · 18.7MOpenAI API · 16.7MOpenAI API · 16.5MOpenAI API · 15.6MOpenAI API · 15.9MOpenAI API · 15.1MOpenAI API · 15.7MOpenAI API · 14.6MOpenAI API · 15.2MStack AI · 143.4KStack AI · 153.7KStack AI · 167.9KStack AI · 160KStack AI · 99.4KStack AI · 35.9KStack AI · 17.4KStack AI · 20.6KStack AI · 14.9KStack AI · 6.3KOpenRouter · 7.5MOpenRouter · 8.6MOpenRouter · 8.4MOpenRouter · 11.2MOpenRouter · 15.8MOpenRouter · 17.9MOpenRouter · 16.8MOpenRouter · 17.3MOpenRouter · 19.2MOpenRouter · 22MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Paid
Freemium
Freemium
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Starting price
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Free tier
Free tier
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Free tier
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Free trial
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API access
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Plans
—
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Free FreeStandard Custom/moBusiness Custom/moEnterprise Custom
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Capabilities input → output
Input
DocumentsImagesTextAudio
DataDocumentsText
VideoTextImagesAudio
TextImagesAudio
Output
AudioCodeImagesTextVideo
Apps
TextVideoImagesAudio
TextImagesApps
Skill level
Advanced
Intermediate
Advanced
Advanced
Categories
Development & CodeAI APILarge Language Models (LLMs)
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Development & CodeAI APILarge Language Models (LLMs)
Development & CodeProductivity & OfficeAI AgentAI API+2 more
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
6
7
5
13
APIs
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Large language models
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Agents
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Agent creation
–
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LLM development
–
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Developer tools
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LLM gateway
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–
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No-code
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–
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Workflows
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–
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Agent management
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–
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Business automation
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–
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Model routing
–
–
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Models management
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–
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Process automation
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–
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AI system monitoring
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–
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API integrations
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–
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Azure
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–
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Chatbot building
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–
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Development
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Finance workflow automation
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Fine-Tuning
–
–
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LLM comparison
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LLM training
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–
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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.