Shortwave
Superhuman
Spark Mail
Gmail
FiloMail
InboxZero
Missive
Sanebox
ChainMemory
Tempreon
TheSecondBrain.dev
Memori
Agentmemory
OpenMemory MCP
Pinecone
Memo.ai
ChainMemory gives your AI agents persistent memory that belongs to YOU โ not to a single vendor.
Save a memory in ChatGPT, recall it in Claude or Gemini. Available via Chrome extension, MCP server (npm), or REST API. Every memory gets a cryptographic fingerprint and project states are anchored with Merkle proofs, so anyone can independently verify integrity โ no trust required.
Memories consolidate into a structured Project Brain (decisions, milestones, risks) instead of a pile of raw notes. Multi-agent native: Claude, Cursor and GPT share one consolidated state. Free tier available.
Shortwave
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Based on our record, Shortwave seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
> [2] https://shortwave.com Welp! It's already hugged to deathi guess. - Source: Hacker News / over 2 years ago
Try Shortwave. A bunch of engineers quit Google and essentially resurrected it. Source: about 4 years ago
Superhuman - Superhuman is an email management tool.
Tempreon - A personal memory layer for your AI tools, connected over MCP.
Spark Mail - Spark helps you take your inbox under control. Instantly see whatโs important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
TheSecondBrain.dev - One Brain. Everywhere you work. One memory for Claude, ChatGPT, Cursor and every AI tool you use. Runs in your own Cloudflare account. Open source.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
Memori - Persistent memory from agent trace, not just conversation