Edge Database Android / iOS* Type of data stored Sync Central Sync P2P Offline Sync Data level encryption License / business model Flutter support Vector (AI) support  Short description Minimum Footprint size Company
Azure SQL Edge  No Relational DB for IoT No No No will provide encryption Proprietary No No Designed as a SQL database for the IoT edge; however, due to the footprint it is no Edge Database 500 MB+ Microsoft
Couchbase Mobile Android / iOS JSON Documents / NoSQL db Yes Yes No Database encryption with SQLCipher (256-bit AES) Partly proprietary, partly open-source, Couchbase Lite is BSL 1.1 Unofficial Flutter plugin for Couchbase Lite Community Edition No Embedded / portable database with P2P and central synchronization (sync) support; pricing upon request; some restrictions apply for the free version. Secure SSL. < 3,5 MB Couchbase
extremeDB iOS In-memory relational DB, hybrid persistence No No No AES encryption Proprietary No Yes, vector support available, nothing more yet Embedded relational database < 1 MB McObject LLC
InterBase ToGo / IBLite Android / iOS Relational No No No 256 bit AES strength encryption Proprietary No No Embeddable SQL database. < 1 MB Embarcadero
LevelDB Android / iOS Key-value pairs / NoSQL db No No No No New BSD Unofficial client that is very badly rated No Portable lightweight key-value store, NoSQL, no index support; benchmarks from 2011 have been removed unfortunately < 1 MB LevelDB
Team
LiteDB Android / iOS (with Xamarin only) NoSQL document store, fully wirtten in .Net No No No Salted AES MIT license No No A .Net embedded NoSQL database < 1 MB LiteDB team
Mongo Realm / Realm DB (acquired by Mongo in 2019) Android / iOS Object Database Yes (Mongo Atlas), tied to using Mongo DB No No Yes Mongo Realm is Apache 2.0, Mongo DB is SSPL, Mongo Atlas (?) Officially released a Flutter binding in spring 2023 (See Flutter databases) No Embedded object database 5 MB+ MongoDB Inc.
ObjectBox Android / iOS / Linux / Windows / any POSIX Object-oriented NoSQL edge database for high-performance on edge devices in Mobile and IoT Yes WIP Yes transport encryption; additional encryption upon request Apache 2.0 and Proprietary Yes Yes, vector support already available, more AI support coming High-performance NoSQL Edge Database with out-of-the-box Data Sync for Mobile and IoT; fully ACID compliant; benchmarks available. < 1 MB ObjectBox
Oracle Database Lite Android / iOS Relational Yes Yes No 128-bit AES Standard encrytion Proprietary No No Portable with P2P and central sync support as well as support for sync with SQLite < 1 MB Oracle Corporation
redis DB No K/V in-memory store, typically used as cache No No No TLS/SSL-based encryption can be enabled for data in motion. Three clause BSD license, RSAL and Proprietary Unofficial redis Dart client available Yes High-performance in-memory Key Value store with optional durability An empty instance uses ~ 3MB of memory redislabs (the original author of redis left in 2020)
SQL Anywhere Android / iOS Relational Yes, tied to using other SAP tech though (we believe) No No AES-FIPS cipher encryption for full database or selected tables Proprietary No No Embedded / portable database with central snyc support with a stationary database, pricing now available here   SAP (originally Sybase)
SQLite embedded on iOS and Android Relational No No No No, Use SQLCipher to encrypt SQLite Public domain Flutter plugins (ORMs) for SQLite, but nothing from Hwaci No, but various unofficial extensions are available C programming library; probably still 90% market share in the small devices space (personal assumption) < 1 MB Hwaci
UnQLite Android / iOS Key-value pairs / JSON store / NoSQL db No No No 128-bit or 256-bit AES standard encryption 2-Clause BSD not yet; might be coming though; there was a 0.0.1 released some time ago No Portable lightweight embedded db; self-contained C library without dependency. ~ 1.5 MB Symisc systems