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It's a split decision.
Choose SQLite when your application needs an embedded SQL engine, runs on a device or computer, and should avoid a separate database server. Its core is public domain and free to use. Choose MongoDB when your app needs a document model, a managed Atlas deployment or self-managed software, and database features such as search and stream processing. Atlas has a free tier, but production clusters add hourly compute and storage costs. Neither is a universal speed winner; workload and deployment matter.
01Side by side
| SQLite | MongoDB | |
|---|---|---|
| Pricing model | Free core; paid support and optional extensions | Hourly Atlas tiers; Enterprise pricing not published |
| Free tier | Core source code is free for any purpose | M0: 512 MB storage; up to 100 ops/second |
| Open source and licence | Public-domain source code | Community Edition is free; licence terms aren't stated |
| Self-hosting | C library embedded in an application | Self-managed MongoDB on your infrastructure |
| API and SDKs | SQL engine with C-language APIs | Document model with a single query API |
| CLI and docs | CLI, C/C++ interface spec, SQL documentation | Documentation, Community Forums, Compass GUI |
| Integrations | Built into mobile phones and most computers | Integrates with 100+ technologies |
| Deployment model | Self-contained library bundled with applications | Atlas cloud service or self-managed software |
SQLite Choose SQLite if
- Choose SQLite if your app needs SQL storage without a database server.
- Choose SQLite if public-domain source code matters.
- Choose SQLite if you need a C library bundled into an application.
MongoDB Choose MongoDB if
- Choose MongoDB if you want a document model and one query API.
- Choose MongoDB if you need Atlas or self-managed deployment options.
- Choose MongoDB if search or stream-processing features fit your application.
02Pricing at real usage
SQLite’s core source code is public domain and free to use. There is no listed per-query or per-server charge for the engine. Costs arise if you buy services or extensions: the Annual Maintenance Subscription is $1,500 per year for one development team and up to 20 contact hours. Technical Support starts at $8,000 for a one-year standard agreement; the SQLite License is a separate $6,000 one-time purchase for a warranty of title.
MongoDB Atlas has a free M0 tier with 512 MB of storage and up to 100 operations per second. Flex is listed at $0.011 per hour, with 5 GB storage and usage costs of $8–$30 per month. Dedicated clusters start at $56.94 per month; hourly rates and included storage vary by cluster. Atlas bills clusters hourly, so costs rise with selected compute and deployment. Enterprise Advanced pricing is not published.
03API, SDKs and integration
SQLite is a C-language library that implements a SQL database engine. Its documentation includes a C/C++ interface specification, a command-line interface, a TCL interface specification, SQL syntax, functions and pragmas. The homepage also links to getting-started material, FAQs and quirks and gotchas. This is an embedded-library integration, not a hosted database API: the homepage says SQLite is built into mobile phones and most computers, and bundled with many applications.
MongoDB describes its document model as using a single query API for application data. The platform is available through Atlas or self-managed software; its homepage lists documentation, Community Forums, Compass, and integrations with 100+ technologies. It also lists search, vector search, stream processing and analytics capabilities. MongoDB’s homepage does not name language-specific SDKs, so check its documentation for the client and language support your stack requires. The homepage identifies Compass as a GUI, not a command-line tool.
04Open source, self-hosting and lock-in
SQLite’s source code is in the public domain and free for anyone to use for any purpose. Its C library can be bundled into an application, so the database engine does not require a separate hosted service. The vendor also sells a $6,000 one-time SQLite License for buyers seeking a warranty of title; that is distinct from the public-domain code.
MongoDB supports self-managed deployments on your own infrastructure as well as Atlas in the cloud. Its homepage offers Community Edition at no cost, but does not state licence terms there; check the applicable licence before choosing it. Atlas adds a managed service relationship, while self-management keeps deployment on your infrastructure. MongoDB lists Relational Migrator for moving applications to MongoDB, but that does not describe an export path out. The vendors do not publish data-export details on their homepages; ask about formats, tooling, and any Atlas transfer charges before planning a migration.
Questions people ask
What are the key differences between MongoDB and SQL databases?
SQLite is a SQL database engine delivered as a C library, so it can be bundled into an application. MongoDB uses a document model and a single query API. MongoDB is available as managed Atlas or self-managed software; SQLite is described as a self-contained library.
Which is faster, MongoDB or SQLite?
There is no workload-independent winner in the published facts. SQLite describes itself as fast, but that is not a comparative benchmark. Performance depends on the application, data, query patterns and deployment. Test representative workloads on the target architecture before choosing.
Can MongoDB be self-hosted?
Yes. MongoDB offers self-managed software for deployment on your own infrastructure, alongside cloud-based Atlas. Its homepage also identifies Community Edition for local development. Check the licence and operational requirements for the exact edition you plan to deploy.
Is SQLite free for commercial use?
SQLite’s source code is in the public domain and is free for anyone to use for any purpose, including commercial use. The vendor separately sells a SQLite License for buyers seeking a warranty of title; it is not presented as a required fee to use the core code.