AccordNote vs Notion vs Obsidian vs Mem.ai
An honest comparison of the most popular knowledge tools, written by someone who tried them all. With real pricing, real trade-offs, and the gap none of them fill.
Every few months a new note app launches and promises to be your "second brain." You download it, import your notes, spend a weekend setting it up, and abandon it within two weeks.
I know because I've done it with all of them. I built AccordNote because none of them solved the one problem I actually had: I keep losing what AI teaches me.
This post is an honest comparison. No affiliate links. No "AccordNote wins in every category" nonsense. Each tool is genuinely good at something. The question is: which something matters to you?
The landscape at a glance
| Product | Free tier | Paid start | Storage | AI built-in | Data ownership |
|---|---|---|---|---|---|
| AccordNote | Unlimited, full AI | Free (Pro $4.99/mo planned) | Your Google Drive | Yes | You own it |
| Notion | Good (individual) | ~$10/mo | Cloud (AWS) | $10/mo add-on | No |
| Obsidian | Excellent (no limits) | $4/mo (sync) | Local files | No (plugins only) | You own it |
| Mem.ai | 25 notes/mo | $12/mo | Cloud (SOC 2) | Yes | No |
| MyMind | 100 cards | $6.99/mo | Cloud (AWS) | Yes (images) | No |
| Glasp | Public highlights | ~$10/mo | Cloud | Some | No (public default) |
| Recall | 10 AI cards/mo | $10/mo | Hybrid | Yes | Partial |
| Readwise | Trial only (30 days) | $5.59/mo | Cloud | Yes | No |
Notion: the workspace you don't need
What it's great at: Team collaboration, databases, project management, documentation.
The problem: Notion is a workspace. You don't need databases, kanban boards, and 50 integrations to capture a ChatGPT answer. Opening Notion to save an AI response feels like driving a semi truck to pick up groceries.
Notion AI is a $10/mo add-on. Your data sits on their AWS servers. There's no browser extension that injects into AI chat interfaces.
When to use Notion instead: You need a team workspace for docs and projects. Notion is genuinely great at that. Just don't use it as your AI knowledge dump.
Obsidian: powerful but manual
What it's great at: Privacy, local-first storage, plugin ecosystem, knowledge graphs.
The problem: Obsidian has no built-in AI. You need community plugins for any intelligence (Copilot for Obsidian has 100K+ users, but you bring your own API key). There's no browser extension that captures from AI chat UIs. Every note requires manual organization: you pick the folder, the tags, the links. For ADHD brains, that friction is where notes go to die.
Sync costs $4/mo. The learning curve is steep for non-technical users.
When to use Obsidian instead: You're technical, you love tinkering with plugins, and you want absolute control over your file system. Obsidian's privacy model is the gold standard. AccordNote comes close with Google Drive, but Obsidian wins on pure local sovereignty.
Mem.ai: the AI notes app that charges for air
What it's great at: AI-powered search, auto-organization, surfacing related notes.
The problem: The free tier gives you 25 notes per month. That's less than one note per day. Pro is $12/mo. Your data lives on Mem's SOC 2 servers, not yours. There's no extension that injects into ChatGPT, Claude, or Gemini.
Mem's AI is good at connecting your notes. But if you can't afford to dump notes freely because of artificial limits, the AI has nothing to work with.
When to use Mem instead: You're willing to pay $12/mo for a polished AI-first note experience, and you don't care about data ownership.
The others: quick takes
MyMind ($6.99/mo): Beautiful for images and visual bookmarks. Not built for text-heavy AI conversations. Free tier is 100 cards, which is unusable. No insight extraction, no backlinks.
Glasp (~$10/mo): Highlights are public by default. Private mode is paid only. If you're saving personal AI answers about health, finances, or business strategy, Glasp's social model is a non-starter.
Recall ($10/mo, Max $38/mo): Closest to AccordNote in concept. Hybrid storage, knowledge graph, spaced repetition. But no AI-chat-native capture, and the free tier is 10 AI cards per month. Expensive at scale.
Readwise Reader ($9.99/mo): No free tier (30-day trial only). Built for long-form reading and highlights, not AI conversations. Excellent for book notes. Not what you need for ChatGPT answers.
What AccordNote does differently
Four things no competitor combines:
1. AI-chat-native capture
AccordNote injects a save icon directly into ChatGPT, Claude, and Gemini. One click captures the full response, formatting and code blocks included. No tab switching, no copy-paste, no folder selection.
On any other website, select text and a floating save button appears.
2. User-owned storage
Your notes live in your browser's IndexedDB and your personal Google Drive (appDataFolder). AccordNote's servers never store, process, or see your content. We literally cannot read your data.
This isn't a marketing claim. The code is structured so there's no server-side note storage at all.
3. Zero-config insight extraction
Click "Extract Insights" on a category and AI reads all your notes, removes duplicates, and produces structured takeaways with links back to the source. Each insight is traceable. No prompting, no setup.
4. Auto-accordion on paste
Paste a numbered AI response and it automatically converts to collapsible sections. Each numbered item becomes an accordion you can open and close. Pure regex, <1ms, zero API cost.
The honest trade-offs
AccordNote is not better than every tool at everything.
- Obsidian has a richer plugin ecosystem. If you want graph views, calendar integration, or Dataview queries, Obsidian is years ahead.
- Notion is better for teams. AccordNote is a personal tool. No collaboration, no shared workspaces.
- Readwise is better for book highlights. If your primary workflow is reading books and articles (not AI chat), Readwise is purpose-built for that.
- Mem's AI search is more mature. Mem has been doing semantic search longer. AccordNote's search is substring-based with regex support, not embedding-based.
So when should you use AccordNote?
Use AccordNote if:
- You use ChatGPT, Claude, or Gemini daily and keep losing what they tell you
- You want zero-friction capture (one click, not three)
- You care about data ownership (your Drive, not their servers)
- You don't want to pay $10-15/mo for basic note capture
- You want AI to extract insights from your notes without manual organization
Use something else if:
- You need a team workspace (Notion)
- You want absolute local-file sovereignty (Obsidian)
- You primarily read books and articles, not AI chat (Readwise)
- You want social/public knowledge sharing (Glasp)
The gap
Every tool on this list does something well. None of them solve the specific problem of capturing, merging, and extracting insights from AI conversations across multiple platforms.
Your ChatGPT history, Claude history, and Gemini history are three separate silos. ChatGPT trains on your conversations by default. None of them let you search across platforms. None of them extract structured insights.
That's the gap AccordNote fills. Not a replacement for your workspace. Not a replacement for your vault. A bridge between your AI conversations and your brain.
Try AccordNote free — no sign-up required.