# Amazon Comprehend vs Flair

| Attribute | Amazon Comprehend | Flair |
|---|---|---|
| **Vioscale score** | 72.3 (33% (low)) | 40.6 (20% (low)) |
| activity.commits_last_30d | - | 0 |
| adoption.dependent_repos | - | 497 |
| adoption.github_stars | - | 14,384 |
| deployment.options | `{"cloud":true}` | - |
| description.long | A machine learning service that processes text to identify entities, sentiment, topics, and key phrases. It supports both standard pre-built models and custom models trained on your own data, with APIs for document processing in multiple formats. | A framework providing pre-built models for natural language processing tasks including entity recognition, sentiment analysis, part-of-speech tagging, and text classification, with multilingual support and specialized biomedical text processing capabilities. |
| language.primary | - | Python |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true,"web":true}` | - |
| pricing | `{"type":"usage","plans":[{"free":false,"name":"Standard APIs (Pay-per-use)","summary":"$0.0001 per unit (100 characters)","features":["Entity recognition","Sentiment analysis","Syntax analysis","Key phrase extraction","Language detection","Event detection","Toxicity detection","Prompt safety classification","PII detection","Redaction"],"components":[{"per":{"qty":1,"unit":"unit"},"kind":"metered","note":"1 unit = 100 characters, 3-unit minimum per request","amount":0.0001,"currency":"USD"}],"description":"Entity recognition, sentiment analysis, syntax analysis, key phrase extraction, language detection, event detection, toxicity detection, prompt safety","contactSales":false,"includedLimits":{"free_tier":"50k units/month for 12 months"}},{"free":false,"name":"Custom Classification & Entities","summary":"$3/hour training + $0.50/month management + $0.0003/unit inference","features":["Custom model training","Custom entity extraction","Custom text classification","Model management"],"components":[{"kind":"one_time","note":"Model training, billed by the second","amount":3,"period":"hour","currency":"USD"},{"kind":"fixed","note":"Custom model management","amount":0.5,"period":"month","currency":"USD"},{"per":{"qty":1,"unit":"unit"},"kind":"metered","note":"Async inference at 100 characters per unit, 3-unit minimum","amount":0.0003,"currency":"USD"}],"description":"Train custom NLP models to categorize text and extract domain-specific entities","contactSales":false},{"free":false,"name":"Managed Endpoints (Synchronous)","summary":"$0.0005 per second per Inference Unit","features":["Real-time synchronous inference","Scalable throughput with multiple IUs"],"components":[{"per":{"qty":1,"unit":"second","quantity":"per Inference Unit"},"kind":"metered","note":"1 IU = 100 characters/sec throughput, minimum 60 seconds per billing period","amount":0.0005,"currency":"USD"}],"description":"Real-time inference endpoints with provisioned throughput","contactSales":false}],"summary":"From $0.0001 per unit (100 characters) for standard APIs. Free tier: 50K units per month for 12 months.","currency":"USD","freeTier":true,"sourceUrl":"https://aws.amazon.com/comprehend/pricing/?pg=ln&sec=hs","retrievedAt":"2026-08-19T16:04:06.586Z","startingPrice":{"amount":0.5,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-19T17:44:05.951Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | commercial |
| pricing.price_level | low | free |
| pricing.starting_price | `{"amount":0.5,"currency":"USD"}` | - |
| pricing.transparent | yes | - |
| release.cadence_days | - | 80 |
| release.history | - | `[{"url":"https://github.com/flairNLP/flair/releases/tag/v0.15.1","date":"2025-02-05T14:46:22Z","type":"stable","version":"v0.15.1"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.15.0","date":"2024-12-20T08:57:44Z","type":"stable","version":"v0.15.0"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.14.0","date":"2024-07-25T12:21:58Z","type":"stable","version":"v0.14.0"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.13.1","date":"2023-12-18T09:29:22Z","type":"stable","version":"v0.13.1"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.13.0","date":"2023-10-28T12:19:55Z","type":"stable","version":"v0.13.0"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.12.2","date":"2023-03-30T15:49:56Z","type":"stable","version":"v0.12.2"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.12.1","date":"2023-03-10T15:32:35Z","type":"stable","version":"v0.12.1"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.12","date":"2023-03-06T10:17:28Z","type":"stable","version":"v0.12"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.11","date":"2022-04-10T20:35:57Z","type":"stable","version":"v0.11"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.10","date":"2021-11-18T08:33:59Z","type":"stable","version":"v0.10"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.9","date":"2021-08-29T23:23:01Z","type":"stable","version":"v0.9"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.8","date":"2021-03-05T11:57:03Z","type":"stable","version":"v0.8"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.7","date":"2020-12-01T19:35:00Z","type":"stable","version":"v0.7"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.6.1","date":"2020-09-23T10:40:31Z","type":"stable","version":"v0.6.1"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.6","date":"2020-08-17T13:34:00Z","type":"stable","version":"v0.6"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.5.1","date":"2020-07-05T21:39:00Z","type":"stable","version":"v0.5.1"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.5","date":"2020-05-24T12:00:55Z","type":"stable","version":"v0.5"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.4.5","date":"2020-01-24T16:08:32Z","type":"stable","version":"v0.4.5"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.4.4","date":"2019-10-20T22:22:35Z","type":"stable","version":"v0.4.4"},{"url":"https://github.com/flairNLP/flair/releases/tag/v0.4.3","date":"2019-08-26T18:26:09Z","type":"stable","version":"v0.4.3"}]` |
| security.disclosure_policy | yes | - |
| security.fedramp | yes | - |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.pci | yes | - |
| security.vulnerabilities | - | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=flair&per_page=100","last_12m":0,"max_severity":"MODERATE"}` |

## Capabilities (NLP Apis)

| Capability | Amazon Comprehend | Flair |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Custom model training | - | - |
| Domain specific models | - | - |
| Deployment model | - | - |
| Batch processing | - | - |
| Real time latency | - | - |
| Embeddings endpoint | - | - |
| Data residency EU | - | - |
| Open source | - | - |
| Pricing model | - | - |

*Source: Vioscale. Generated 2026-09-01T17:07:02.947Z. "-" = undocumented, not absent.*