GPUHour vs Zarx
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
GPUHour compared with Zarx
| Detail | 
GPUHour | 
Zarx |
|---|
| What it does | Live cloud GPU price comparison across marketplaces and providers
| EU-resident inference API for open-weight language models
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| Stage | Not given
| MVP
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| Founded | Not given
| Not given
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| Based in | Not given
| ES
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| Pricing model | Free
| Contact for pricing
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| Pricing | Not given
| Not given
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| Key features | - Live price polling from provider APIs
- Sortable comparison table with 286 prices across 82 GPU models
- Price normalization to per GPU-hour
- Tracks 61 providers
- Spot and on-demand pricing comparison
- Free JSON API
- Android app available
- Real-time timestamp tracking
- Support for consumer and datacenter GPU cards
| - OpenAI-compatible Responses and Chat Completions endpoints
- Streaming with Server-Sent Events
- Function calling and tool use
- Structured JSON output with schema validation
- Audio transcription with file and live WebSocket modes
- Text-to-speech with built-in and customizable voices
- Speech-to-speech translation
- Time series forecasting up to 1,000 periods
- Per-key usage tracking and limits
- Servers owned and operated by NPAW in EU
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| What makes it different | - Real-time pricing data from provider APIs instead of stale spreadsheets
- Unified table comparing all GPU rental options instead of checking 15+ pricing pages
- Shows actual price spread for same GPU across different clouds
- Transparent about data availability and updates timestamps
- Free API access to price data
| - Data residency in EU with no US sub-processor in the data path
- OpenAI-compatible API so teams can keep existing integrations
- Three capability levels—Z Ultra, Z Pro, Z Fast—on the same API
- Operated by NPAW, which has run its own data infrastructure since 2008
- ISO 27001, ISO 27701, ISO 42001 and ENS High certified
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ▲ +1 (up) since last check | 5 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 0 |
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| Citation Flow (Majestic) | 19 | 13 |
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| Referring domains (Majestic) | 22 | 1 |
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4 details filled in for both companies.
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