The best alternatives to Spidr are Mapped, Signal Messenger, and KeyMesh.io. If these 3 options don't work for you, we've listed a few more alternatives below.
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Signal is a cross-platform encrypted messaging service developed by the Signal Foundation and Signal Messenger LLC. It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos.
KeyMesh is a decentralized address book for Ethereum accounts. You can use it to prove on Twitter that you own an account, and search for other accounts using Twitter names. Using KeyMesh you can send money and messages to verified Twitter names, instead of long addresses.