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Supermemory VS Underscore Done

Compare Supermemory VS Underscore Done and see what are their differences

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Contents:
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  2. ยป Reviews
  3. ยป Alternatives

Supermemory logo Supermemory

ai second brain for all your saved stuff

Underscore Done logo Underscore Done

Real-world tasks your agent can't do alone.
Not present
  • Underscore Done Main Screen
    Main Screen //
    2026-08-09

Underscore Done (_done) is a suite of pay-per-call utility APIs built for AI agents. No API keys, no subscriptions - agents pay per request with USDC via the x402 protocol

Supermemory

Website
supermemory.ai
Pricing URL
-
$ Details
-
Release Date
-
Edit details

Underscore Done

Website
underscoredone.com
Pricing URL
Official Underscore Done Pricing
$ Details
paid $0.01 (Per api call)
Release Date
2026 July
Startup details
Country
United States
State
texas
City
Austin
Edit details

Analysis of Supermemory

Overall verdict

  • Supermemory is a solid tool for building a personal or organizational knowledge base, offering an effective way to save, organize, and retrieve information from across the web using AI-powered search and recall.

Why this product is good

  • AI-powered semantic search lets you retrieve saved content by meaning rather than exact keywords
  • Easily capture bookmarks, articles, tweets, notes, and other web content into a unified knowledge hub
  • Acts as a 'second brain' that helps you connect and rediscover previously saved information
  • Offers integrations and a browser extension for frictionless capture of content
  • Useful for chatting with your own saved knowledge base via an AI interface

Recommended for

  • Researchers and students who collect and reference large amounts of information
  • Content creators and writers who need to organize inspiration and source material
  • Knowledge workers wanting a personal 'second brain' for productivity
  • Developers building AI apps that need a memory or knowledge layer
  • Anyone who bookmarks heavily and struggles to find saved content later

Category Popularity

0-100% (relative to Supermemory and Underscore Done)

Supermemory

Underscore Done

AI
93 93%
AI
7% 7
AI Agents
0 0%
AI Agents
100% 100
Productivity
100 100%
Productivity
0% 0
Developer Tools
100 100%
Developer Tools
0% 0

Questions & Answers

As answered by people managing Supermemory and Underscore Done.

What makes your product unique?

Underscore Done's answer:

We provide data and actions that AI cannot achieve.

Also we don't require accounts, registration, api keys. And we charge per usage and never charge monthly subscriptions.

How would you describe the primary audience of your product?

Underscore Done's answer:

Ai Agents that work on behalf of people.

User comments

Share your experience with using Supermemory and Underscore Done. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, Supermemory seems to be more popular. It has been mentiond 4 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.

Supermemory mentions (4)

  • AI Agentic Memory for beginners.
    This is usually a challenge that any developer has to take care of when building an AI agent. In fact, managing the context is one of the hardest problems when working with AI agents and there are many companies like SuperMemory, Mem0 which have invested both resources and time to solve this problem. - Source: dev.to / 20 days ago
  • Building an autonomous Slack agent with OpenCode
    Memory. I use Supermemory for this. Before, Pipa loaded context files and knew to update them. A memory tool adds teammate-like recall: goals, preferences, latest business state, and small details that should carry across runs. Good memory tools also know how to supersede and delete memories, which matters once the agent has more autonomy. - Source: dev.to / 2 months ago
  • Build a Real-Time Voice RAG Agent for Your Documentation
    We wire everything up with Vision Agents as the voice agent framework, Stream for WebRTC audio and video, OpenAI Realtime for speech in and speech out, Anam so the agent shows up as a face on the video, and Supermemory so answers come from search over your uploaded documents instead of guesswork. The code stays small and most of the behavior lives in one registered function that asks the memory store for relevant... - Source: dev.to / 3 months ago
  • Ask HN: What are you working on (August 2024)?
    My friends and I are working on https://supermemory.ai, an AI second brain to help you remember content from saved webpages and notes. - Source: Hacker News / almost 2 years ago

Underscore Done mentions (0)

We have not tracked any mentions of Underscore Done yet. Tracking of Underscore Done recommendations started around Aug 2026.

What are some alternatives?

When comparing Supermemory and Underscore Done, you can also consider the following products

Mem - Capture and access information from anywhere

AgentGatePay - Enable AI agents to make autonomous payments with AP2 mandates and X402 protocol. Multi-chain crypto, budget controls, instant settlement.

Mem0 - Your private, local memory layer for all AI tools

x402 - An open protocol for internet-native payments from Coinbase

OpenMemory - Give AI agents long-term memory.

Mengram - AI memory API with 3 types: facts, events, and workflows

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