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Calibre vs Signal

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Calibre Signal
PriceFreeFree
Pricing modelfreefree
LicenseGPL-3.0AGPL-3.0
Open sourceYesYes
Self-hostableYesNo
Platformswindows, macos, linuxwindows, macos, linux, android, ios
Rating4.6★ (48000)4.5★ (350000)
RepositoryAvailableAvailable
Last updatedAug 2026Aug 2026
Calibre alternatives Signal alternatives
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