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