Features that Molly has but Signal lacks:
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Uses OpenStreetMap for maps and not Google maps unlike Signal.
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Supports UnifiedPush for Push notifications. If you got no Play services on your phone, Molly falls back to WebSocket which is more efficient than Signal and drains less battery power.
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(Fully FOSS) Contains no proprietary blobs, unlike Signal (Molly-FOSS version).
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(Local encryption) Protects database with passphrase encryption.
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(Automatic locking) Locks down the app automatically when you are gone for a set period of time.
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(RAM Shredding) Securely shreds sensitive data from RAM.
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(Backup scheduling) Automatic backups on a daily or weekly basis.
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Supports SOCKS proxy and Tor via Orbot. Before you say Signal supports “proxy” it is just for their TLS signal server proxies.
And a lot more…
What Molly is working on or planning to work on:
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Use a private crypto wallet (Monero) for payments integrated in app, unlike MobileCoin that is currently in Signal app that is a well known scam.
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Remote attestation (based on auditor)
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Sandboxing WebRTC
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Text only mode
It is actually funny how you think these features should be present in the official Android client as Signal “prioritizes privacy and security”, but Signal have clearly refused to implement any of those.
Molly devs are planning on getting an audit soon.