StreamTranslate supports real-time translation across 28+ languages. Quality and accuracy benchmarks below are based on internal QA against curated source audio. Tier 1 languages have native-speaker QA; Tier 2 are continuously improving.
| Code | Language | Translation Quality | ASR Accuracy | Tier |
|---|---|---|---|---|
| en | English | Native | 99% | Tier 1 |
| es | Spanish | Excellent | 98% | Tier 1 |
| fr | French | Excellent | 98% | Tier 1 |
| de | German | Excellent | 98% | Tier 1 |
| pt | Portuguese (BR/PT) | Excellent | 97% | Tier 1 |
| it | Italian | Excellent | 97% | Tier 1 |
| nl | Dutch | Excellent | 96% | Tier 1 |
| ja | Japanese | Very Good | 95% | Tier 1 |
| ko | Korean | Very Good | 95% | Tier 1 |
| zh | Chinese (Mandarin) | Very Good | 94% | Tier 1 |
| ru | Russian | Very Good | 95% | Tier 1 |
| pl | Polish | Very Good | 94% | Tier 1 |
| tr | Turkish | Very Good | 93% | Tier 1 |
| ar | Arabic (MSA) | Good | 91% | Tier 2 |
| hi | Hindi | Good | 90% | Tier 2 |
| id | Indonesian | Good | 92% | Tier 2 |
| vi | Vietnamese | Good | 90% | Tier 2 |
| th | Thai | Good | 89% | Tier 2 |
| sv | Swedish | Excellent | 96% | Tier 1 |
| da | Danish | Excellent | 96% | Tier 1 |
| no | Norwegian | Excellent | 95% | Tier 1 |
| fi | Finnish | Very Good | 94% | Tier 1 |
| cs | Czech | Very Good | 93% | Tier 1 |
| ro | Romanian | Very Good | 92% | Tier 2 |
| hu | Hungarian | Very Good | 92% | Tier 2 |
| el | Greek | Good | 91% | Tier 2 |
| uk | Ukrainian | Good | 91% | Tier 2 |
| he | Hebrew | Good | 90% | Tier 2 |
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