Side by side

AlterSend vs CasaDrop

Both stand on file transfer services. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

AlterSend

Free plan AndroidiPhoneLinux+4

AlterSend combines broad platform support, encrypted peer transfers, resumable sending, and self-hosting. Relay limits and brief IP visibility during peer discovery are the main constraints to weigh.

Visit AlterSend

CasaDrop combines file and folder sharing with controlled upload collection and user-management options. Keep backups before upgrades, since downgrading across a database schema change is unsupported.

Visit CasaDrop

The facts

	AlterSend	CasaDrop
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Android, iPhone, Linux, Mac, Self-hosted, Web, Windows	API, Linux, Self-hosted, Web
Lowest paid plan	Business self-hosted relay: $390 per organization a year	Free or on request
Plans published	5	1
Maker	Not published	Not published
Website	altersend.com	github.com
On file transfer services	#20 of 105	#16 of 105

AlterSend: what it does well

End-to-end encrypted transfers
Direct transfers are unlimited on free plan
Transfers can resume after reconnection
Supports Android, iOS, desktop, web, and self-hosting
Apache 2.0 open-source license

What to know first

Free relayed app transfers capped at 20 GB
Browser links capped at 10 GB
Peer discovery briefly exposes device IP addresses
Business self-hosted relay costs $390 a year

CasaDrop: what it does well

Share links support passwords, expiry, limits, and QR codes
Uploads can reach 100 GB when configured
Uploads can resume after reloads or server restarts
Includes API, metrics, health probes, and activity logs

What to know first

Default maximum uncompressed folder ZIP budget is 10 GB
Downgrading across a schema change is unsupported
Deployment is self-hosted

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