# Dapper vs Sequelize

**Leader by Vioscale score:** Sequelize

| Attribute | Dapper | Sequelize |
|---|---|---|
| **Vioscale score** | 52.1 (38% (low)) | 73.7 (72% (medium)) |
| activity.commits_last_30d | 6 | 7 |
| adoption.dependent_repos | 477 | 193,226 |
| adoption.github_stars | 18,373 | 30,377 |
| adoption.package_downloads_weekly | - | 2,842,247 |
| deployment.options | - | `{"self_hosted":true}` |
| description.long | A micro-ORM for .NET that extends ADO.NET connections to execute SQL queries and stored procedures, supporting both synchronous and asynchronous operations with features for object mapping, dynamic SQL building, and multi-result set processing. | Sequelize is an ORM that bridges JavaScript and TypeScript applications with multiple relational databases including PostgreSQL, MySQL, MariaDB, SQLite, Oracle, SQL Server, Snowflake, and DB2. It provides declarative schema modeling, relationship definitions, transaction support, and flexible data loading strategies. |
| features.capabilities | `{"raw_sql":true,"multi_db":true,"languages":"C# / .NET (all TFMs)","relations":true}` | `{"multi_db":true,"languages":"JavaScript, TypeScript","relations":true,"migrations":true,"schema_first":true,"type_safe_queries":true}` |
| language.primary | C# | TypeScript |
| license.spdx | - | MIT |
| market.availability | - | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | - | `{"cli":true}` |
| pricing | - | `{"type":"open_source","freeTier":true,"sourceUrl":"https://sequelize.org","retrievedAt":"2026-08-14T21:37:06.541Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | - | commercial |
| pricing.price_level | - | free |
| pricing.transparent | - | yes |
| release.cadence_days | 26 | 20 |
| release.history | `[{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.79","date":"2026-05-16T20:40:41Z","type":"stable","version":"2.1.79"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.72","date":"2026-03-06T07:16:11Z","type":"stable","version":"2.1.72"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.66","date":"2025-02-06T12:26:12Z","type":"stable","version":"2.1.66"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.44","date":"2024-04-12T12:42:44Z","type":"stable","version":"2.1.44"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.42","date":"2024-04-12T10:23:44Z","type":"stable","version":"2.1.42"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.37","date":"2024-03-14T15:17:02Z","type":"stable","version":"2.1.37"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.35","date":"2024-03-06T15:08:18Z","type":"stable","version":"2.1.35"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.28","date":"2024-01-02T16:13:39Z","type":"stable","version":"2.1.28"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.24","date":"2023-11-23T09:30:26Z","type":"stable","version":"2.1.24"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.21","date":"2023-11-11T09:07:29Z","type":"stable","version":"2.1.21"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.15","date":"2023-10-19T12:52:19Z","type":"stable","version":"2.1.15"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.11","date":"2023-10-13T06:26:06Z","type":"stable","version":"2.1.11"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.4","date":"2023-09-13T20:52:44Z","type":"stable","version":"2.1.4"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.1.1","date":"2023-09-12T15:17:35Z","type":"stable","version":"2.1.1"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.0.151","date":"2023-08-18T09:51:46Z","type":"stable","version":"2.0.151"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.0.143","date":"2023-06-20T12:43:19Z","type":"stable","version":"2.0.143"},{"url":"https://github.com/DapperLib/Dapper/releases/tag/2.0.138","date":"2023-06-09T15:32:01Z","type":"stable","version":"2.0.138"}]` | `[{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.8","date":"2026-03-07T18:44:44Z","type":"stable","version":"v6.37.8"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.48","date":"2026-02-04T13:52:17Z","type":"prerelease","version":"v7.0.0-alpha.48"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.47","date":"2025-10-25T08:02:02Z","type":"prerelease","version":"v7.0.0-alpha.47"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.7","date":"2025-03-28T11:35:01Z","type":"stable","version":"v6.37.7"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.46","date":"2025-03-22T20:59:50Z","type":"prerelease","version":"v7.0.0-alpha.46"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.6","date":"2025-03-04T10:38:26Z","type":"stable","version":"v6.37.6"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.45","date":"2025-02-17T13:59:21Z","type":"prerelease","version":"v7.0.0-alpha.45"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.44","date":"2025-01-27T07:32:05Z","type":"prerelease","version":"v7.0.0-alpha.44"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.5","date":"2024-10-25T12:30:39Z","type":"stable","version":"v6.37.5"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.43","date":"2024-10-04T14:13:01Z","type":"prerelease","version":"v7.0.0-alpha.43"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.4","date":"2024-10-04T14:21:15Z","type":"stable","version":"v6.37.4"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.42","date":"2024-09-13T13:40:39Z","type":"prerelease","version":"v7.0.0-alpha.42"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.41","date":"2024-05-17T14:56:35Z","type":"prerelease","version":"v7.0.0-alpha.41"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.3","date":"2024-04-13T20:54:30Z","type":"stable","version":"v6.37.3"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.40","date":"2024-04-11T17:31:50Z","type":"prerelease","version":"v7.0.0-alpha.40"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.2","date":"2024-03-29T18:55:34Z","type":"stable","version":"v6.37.2"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.39","date":"2024-03-22T17:25:56Z","type":"prerelease","version":"v7.0.0-alpha.39"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.38","date":"2024-03-19T08:38:28Z","type":"prerelease","version":"v7.0.0-alpha.38"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v7.0.0-alpha.37","date":"2024-02-10T13:55:26Z","type":"prerelease","version":"v7.0.0-alpha.37"},{"url":"https://github.com/sequelize/sequelize/releases/tag/v6.37.1","date":"2024-02-18T00:44:09Z","type":"stable","version":"v6.37.1"}]` |
| reliability.status_page | yes | - |
| security.disclosure_policy | - | yes |
| security.scorecard | - | 6.7 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=nuget&package_name=dapper&per_page=100","last_12m":0,"max_severity":null}` | `{"count":19,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=sequelize&per_page=100","last_12m":2,"max_severity":"CRITICAL"}` |

## Capabilities (ORM & Database Tools)

| Capability | Dapper | Sequelize |
|---|:--:|:--:|
| **Core** |  |  |
| Type-safe queries | - | ✓ |
| Schema migrations | - | ✓ |
| Relations / joins API | ✓ | ✓ |
| Languages | C# / .NET (all TFMs) | JavaScript, TypeScript |
| **Modelling** |  |  |
| Schema-first modelling | - | ✓ |
| **Flexibility** |  |  |
| Raw SQL escape hatch | ✓ | - |
| **Portability** |  |  |
| Multiple database backends | ✓ | ✓ |
| **Ops** |  |  |
| Connection pooling | - | - |
| **DX** |  |  |
| Data browser / studio | - | - |

*Source: Vioscale. Generated 2026-09-01T15:00:58.298Z. "-" = undocumented, not absent.*