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Can Swift packages do in-memory database?

also known as: memory database · transient store

Built into the OS — no dependency

Apple framework	iOS	macOS	watchOS	tvOS	visionOS	Linux	Catalyst
CoreData built in as of Xcode 26.6 Details NSInMemoryStoreType persistent store.	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✕ not served here · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `NSInMemoryStoreType` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →
SwiftData built in as of Xcode 26.6 Details In-memory container via ModelConfiguration(isStoredInMemoryOnly:).	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✕ not served here · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →	✓ serves it · confidence 0.90 · as of Xcode 26.6 `ModelConfiguration.isStoredInMemoryOnly` Apple SDK symbol graph · Xcode 26.6 View in Apple Docs →

Package	iOS	macOS	watchOS	tvOS	visionOS	Linux	Catalyst
cache full menu as of 7.4.0 Details	✓ serves it · confidence 0.90 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.90 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.85 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.90 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.85 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.70 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → Surface digest resolves this decl present on linux (no gap); source is Foundation-only under Source/Shared with no os() guards, but there is no Linux CI or README corroboration - confidence reduced. `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →	✓ serves it · confidence 0.85 · as of 7.4.0 `MemoryStorage` Source/Shared/Storage/MemoryStorage.swift:3 View the line on GitHub → `MemoryConfig` Source/Shared/Configuration/MemoryConfig.swift:3 View the line on GitHub → `MemoryStorage.setObject` Source/Shared/Storage/MemoryStorage.swift:42 View the line on GitHub →
fluent-sqlite-driver full menu as of 4.9.0 Details	✓ serves it · confidence 0.90 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Dedicated in-memory SQLite configuration (storage: .memory); unconditional, no platform gaps. `DatabaseConfigurationFactory.sqlite` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:14 View the line on GitHub → Factory defaults to .memory configuration (config: SQLiteConfiguration = .memory). Package.swift:8 View the line on GitHub → Manifest declares .iOS(.v13) floor.	✓ serves it · confidence 0.90 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Dedicated in-memory SQLite configuration (storage: .memory); unconditional, no platform gaps. `DatabaseConfigurationFactory.sqlite` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:14 View the line on GitHub → Factory defaults to .memory configuration (config: SQLiteConfiguration = .memory). Package.swift:7 View the line on GitHub → Manifest declares .macOS(.v10_15) floor.	✓ serves it · confidence 0.90 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Dedicated in-memory SQLite configuration (storage: .memory); unconditional, no platform gaps. Package.swift:9 View the line on GitHub → Manifest declares .watchOS(.v6) floor.	✓ serves it · confidence 0.90 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Dedicated in-memory SQLite configuration (storage: .memory); unconditional, no platform gaps. Package.swift:10 View the line on GitHub → Manifest declares .tvOS(.v13) floor.	✓ serves it · confidence 0.70 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Unconditional public decl; surface digest lists no visionOS gap. No explicit visionOS manifest floor, so confidence lowered.	✓ serves it · confidence 0.85 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Unconditional public decl; surface digest lists no linux gap. Vapor server-side package, CI tested on Linux. `DatabaseConfigurationFactory.sqlite` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:14 View the line on GitHub → Factory defaults to .memory configuration (config: SQLiteConfiguration = .memory).	✓ serves it · confidence 0.70 · as of 4.9.0 `SQLiteConfiguration.memory` Sources/FluentSQLiteDriver/FluentSQLiteConfiguration.swift:125 View the line on GitHub → Unconditional public decl; surface digest lists no macCatalyst gap. No explicit macCatalyst manifest floor, so confidence lowered.
sqlite.swift full menu as of 0.16.0 Details	✓ serves it · confidence 0.90 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:39 View the line on GitHub → Package.swift declares a iOS platform floor.	✓ serves it · confidence 0.90 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:40 View the line on GitHub → Package.swift declares a macOS platform floor.	✓ serves it · confidence 0.90 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:41 View the line on GitHub → Package.swift declares a watchOS platform floor.	✓ serves it · confidence 0.90 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:42 View the line on GitHub → Package.swift declares a tvOS platform floor.	✓ serves it · confidence 0.90 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:43 View the line on GitHub → Package.swift declares a visionOS platform floor.	✓ serves it · confidence 0.85 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:31 View the line on GitHub → Package.swift has an explicit #if os(Linux) branch enabling the SQLiteSwiftCSQLite default trait (bundled SQLite for Linux builds).	✓ serves it · confidence 0.85 · as of 0.16.0 `Connection.Location.inMemory` Sources/SQLite/Core/Connection.swift:46 View the line on GitHub → `Connection.init` Sources/SQLite/Core/Connection.swift:106 View the line on GitHub → init(_ location: Location = .inMemory, readonly: Bool = false) throws — in-memory is the default location. Package.swift:38 View the line on GitHub → Package.swift does not declare a macCatalyst floor, but all anchor symbols are unconditional (no platform gaps) in the extracted surface.
blackbird as of 0.5 Details	✓ serves it · confidence 0.90 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → Doc: 'Instantiates a new SQLite database in memory, without persisting to a file.' `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'. Package.swift:9 View the line on GitHub → Package.swift declares .iOS(.v15) platform floor	✓ serves it · confidence 0.90 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → Doc: 'Instantiates a new SQLite database in memory, without persisting to a file.' `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'. Package.swift:8 View the line on GitHub → Package.swift declares .macOS(.v12) platform floor	✓ serves it · confidence 0.90 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → Doc: 'Instantiates a new SQLite database in memory, without persisting to a file.' `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'. Package.swift:10 View the line on GitHub → Package.swift declares .watchOS(.v8) platform floor	✓ serves it · confidence 0.90 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → Doc: 'Instantiates a new SQLite database in memory, without persisting to a file.' `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'. Package.swift:11 View the line on GitHub → Package.swift declares .tvOS(.v15) platform floor	✓ serves it · confidence 0.80 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → No explicit manifest floor (swift-tools-version 5.7 predates visionOS); symbols are unconditional in the surface digest. `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'.	? not verified yet · confidence 0.20 · as of 0.5 Package.swift:7 View the line on GitHub → platforms list contains only Apple platforms; Surface digest records no platform gaps, but sources unconditionally import Combine, SwiftUI, OSLog and SQLite3 with no os() guards, and Package.swift declares no Linux support; Linux buildability is unverified. Symbol absence is not absence evidence, so status is unknown.	✓ serves it · confidence 0.80 · as of 0.5 `Blackbird.Database.inMemoryDatabase` Sources/Blackbird/BlackbirdDatabase.swift:351 View the line on GitHub → No explicit manifest floor (swift-tools-version 5.7 predates visionOS); symbols are unconditional in the surface digest. `Blackbird.Database.path` Sources/Blackbird/BlackbirdDatabase.swift:327 View the line on GitHub → Doc: path is 'nil for in-memory databases'.
boutique as of 3.0.2 Details	✓ serves it · confidence 0.70 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk	✓ serves it · confidence 0.70 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk	✓ serves it · confidence 0.60 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) No explicit watchOS floor in Package.swift (manifest lists only iOS/macOS); symbol anchors are unconditional and the digest resolves them present on watchOS. `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk	✓ serves it · confidence 0.60 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) No explicit tvOS floor in Package.swift (manifest lists only iOS/macOS); symbol anchors are unconditional and the digest resolves them present on tvOS. `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk	✓ serves it · confidence 0.60 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) No explicit visionOS floor in Package.swift (manifest lists only iOS/macOS); symbol anchors are unconditional and the digest resolves them present on visionOS. `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk	? not verified yet · confidence 0.20 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → Surface digest resolves this decl present on linux (no os() conditions anywhere in the public surface), but the module unconditionally imports SwiftUI, Security, and Observation; Package.swift and README declare only iOS 17+/macOS 14+. Linux buildability unverified — honest answer is unknown.	✓ serves it · confidence 0.65 · as of 3.0.2 `Store.items` Sources/Boutique/Store.swift:64 View the line on GitHub → var items: [Item] — items are held in and read synchronously from the Store's in-memory cache layer (dual-layer memory + disk architecture) No explicit macCatalyst floor in Package.swift (manifest lists only iOS/macOS); symbol anchors are unconditional and the digest resolves them present on macCatalyst. `Store.init` Sources/Boutique/Store.swift:102 View the line on GitHub → doc: 'persisting items to a memory cache' — memory layer is intrinsic to every Store `Store.previewStore` `#if DEBUG` Sources/Boutique/Store.swift:304 View the line on GitHub → DEBUG-only transient Store that only holds items in memory (SwiftUI Previews); no files written to disk
grdb.swift as of v7.11.1 Details	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)	? not verified yet · confidence 0.30 · as of v7.11.1 README.md:423 View the line on GitHub → README: 'Database queues support in-memory databases' (v7.11.1 README.md line 423)

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