Overview

Sia combines a consumer cloud-storage app with tools for developers building storage into applications. It is most compelling for privacy-minded users and developers who want a decentralized storage network; consumer plans are easier to compare, while network use requires separate usage-cost calculations.

Files are encrypted on the user’s device before upload, and Sia says nobody else can read them. The app describes redundant storage across independent hosts worldwide, with downloads available in parallel from multiple hosts. That distributed design is a meaningful alternative to relying on one central access point, though the consumer plan quotas and network rates serve different needs.

Sia’s project dates to 2013. It describes itself as open source and supported by the nonprofit Sia Foundation and community donations; the Sia Storage site identifies The Sia Storage Company. Support is through Discord’s help channel or hello@sia.tech.

Key features

Encryption before upload: Files are encrypted on the user’s device, which makes Sia a fit for users who want storage hosts unable to read their files, according to Sia.
Distributed storage and retrieval: Redundant storage across independent hosts and parallel downloads are designed to spread storage and retrieval across the network rather than rely on one access point.
Developer SDKs: SDKs for Rust, Go, Python, and JavaScript give developers several language options for building storage into applications.
S3-compatible gateway: The s3d gateway works with rclone, Cyberduck, Nextcloud, Duplicati, and other S3 clients, making it relevant to teams that already use those tools.
Self-hosting flexibility: The SDK can connect to any indexer, including one the user hosts, for developers who want to manage that part of the setup themselves.
Open network model: Sia describes its network as peer-to-peer with no central access point or single point of failure. It also supports IPFS and identifies its network type as hybrid.

Pricing

The consumer plans set storage, app-count, and speed limits. The free tier is a useful way to start, but its 50 GB cap makes it a constrained long-term option for larger libraries.

Plan	Price	Included	Best fit
Free	0.00 USD per free	50 GB storage, 3 apps, 500 Mbps	Trying the consumer service or storing a modest amount.
Plus	7.99 USD per month	500 GB storage, 3 apps, 500 Mbps	Users who need more capacity without changing the free tier’s app or speed allowance.
Pro	14.99 USD per month	5 TB storage, 5 apps, 1 Gbps	Users needing substantially more space and higher listed speed.
Unlimited	19.99 USD per month	10 TB storage, $4.99/TB-mo over, 100 apps, 5 Gbps	Large libraries or many apps, with extra storage priced per TB-month beyond the included capacity.

These consumer allowances should not be confused with Sia network pricing. The network page gives median rates of $3.53/TB/month for storage at 3X redundancy, $0.03/TB for upload, and $2.25/TB for download. Those usage-based rates are more relevant to developers estimating storage and transfer costs than to someone choosing a fixed consumer tier.

Platforms

Sia supports Android, iOS, Linux, macOS, Windows, and web, as well as API and self-hosted use. Desktop and mobile apps are available. That breadth accommodates both ordinary device use and developer or self-managed deployments.

Who it's for

Sia is a strong candidate for people who value device-side encryption and distributed storage, and for developers who want SDKs, S3-compatible access, or the option to use their own indexer. Users with a smaller storage need can start free; those with larger needs should compare the consumer quota tiers against network storage and transfer charges. It is less suitable for someone who wants to treat the consumer plan price as the whole cost of developer-network use.

Pros and cons

Pro: Privacy-oriented storage. Files are encrypted before upload, and Sia says other parties cannot read them.
Pro: Multiple routes for developers. Four SDK languages, an S3-compatible gateway, and self-hosted indexer support provide flexibility for application builders.
Pro: Clear consumer capacity tiers. The plans progress from 50 GB free to 10 TB, with app-count and speed allowances also stated.
Con: Consumer and network pricing are separate. Developers need to account for storage, upload, and download rates rather than assume the consumer tiers cover network use.
Con: The free tier is capped at 50 GB. It can serve as a starting point, but larger storage needs require a paid plan or another approach.

Alternatives

For a wider comparison, see Decentralized Storage Services. Choose Peergos if fully open-source server code and reproducible builds are priorities; it has no free plan and supports self-hosting. Carbide Network is another option, with Android, iOS, macOS, Windows, and API support and plans that describe provider earnings and per-GB billing. Consider Stratos for a freemium service with a similarly broad mix of mobile, desktop, web, API, and self-hosted platforms.

Aleph Cloud (formerly Aleph.im) is worth comparing if you want API and web access alongside a free static-website tier with IPFS distribution and basic bandwidth. Walrus has a free launch-period plan and was created by Mysten Labs, the team behind Sui. Filecoin may suit buyers looking for a listed 2.50 USD per month starting rate for Filecoin Onchain Cloud, with a minimum of two copies. Arweave is another paid option with broad platform support. Swarm is a paid alternative whose maker describes its code as open source and its network as open and permissionless.

Verdict

Choose Sia if you want device-encrypted storage backed by a distributed network, or if you are a developer who can use its SDKs, gateway, and network pricing. The main reason to look elsewhere is the split between consumer quotas and usage-based network costs: those evaluating application storage need to estimate transfer as well as capacity.

	Sia	Storj
Free plan	Yes	No
Free trial	No	No
Paid from	$7.99/mo	—
Open source	No	No
Platforms	Android, api, iOS, Linux, macOS, self-hosted, Web, Windows	Web
Free plan	Yes	No
Free storage	50 GB	—
Network type	hybrid	—
Client-side encryption	Yes	—
IPFS support	Yes	—
Desktop apps	Yes	—
Mobile apps	Yes	—
Paid from	—	7 /mo

Sia vs Storj

Sia

Storj