If you want one recommendation: NotebookLM (now branded Gemini Notebook) is the best free option, because every feature is available at $0 and the free tier limits volume rather than capability. For paid picks, Mem Pro at $8.33/month annual is the strongest solo knowledge-management choice, Otter Pro at $8.33/month annual wins meeting capture, Notion Business at $20/user/month annual is the pick for teams that already live in Notion, and Obsidian is the answer if data ownership matters more than convenience.
TL;DR
- Cheapest full-featured AI: NotebookLM/Gemini Notebook, free with 100 notebooks, 50 sources per notebook and 50 chat queries per day.
- Best meeting transcription: Otter.ai Pro, $8.33/month billed annually or $16.99/month monthly.
- Best zero-effort organisation: Mem Pro, $8.33/month annually or $14.99/month monthly.
- Best for teams already on Notion: Business at $20/user/month annually; the standalone $10 AI add-on was retired in May 2025, so Business is now the cheapest tier with full AI.
- Best for privacy and ownership: Obsidian, free for personal and commercial use since February 2025, with optional Sync at $4/month annual.
- Last verified: 4 August 2026, against vendor pricing pages.
What are the best AI note-taking apps in 2026 at a glance?
| Tool | Free tier | Standout feature | Best for | Key limitation |
|---|---|---|---|---|
| Notion AI | Yes, limited AI trial allocation | Ask Notion search across every page, plus AI Meeting Notes and agents | Teams using Notion as their knowledge base | Full AI requires Business at $20/user/mo annual; no offline mode |
| Otter.ai | Yes, ~300 min/mo with a 30-min cap per conversation | OtterPilot auto-joins calendar meetings and IDs speakers live | Meeting-heavy professionals | Not a knowledge base; Business seats are $30/user/mo |
| Mem | Yes, ~25 items/mo | AI auto-tags and links notes, no folders required | People who refuse to maintain a hierarchy | No Android app; thin integration ecosystem |
| Obsidian | Yes, the complete app | Local plain-Markdown vault with 4,300+ plugins | Privacy-focused knowledge workers and developers | No built-in AI; you configure plugins and supply API keys |
| NotebookLM / Gemini Notebook | Yes, every feature included | Source-grounded answers that cite your uploaded documents | Researchers and students | Works on uploaded sources only; no meeting recording |
Pricing checked 4 August 2026. Verify current figures at notion.com/pricing, otter.ai/pricing, get.mem.ai/pricing, obsidian.md/pricing and notebooklm.google/plans.
Why should you split "AI note-taking" into two categories before buying?
Almost every comparison list treats these five products as competitors. They are not. Two distinct jobs are hiding inside one search term:
- Knowledge management. Organising your own thinking over months and years. Notion, Mem and Obsidian compete here. Success looks like finding something you wrote eight months ago in one query.
- Meeting capture. Recording, transcribing and summarising conversations you were part of. Otter owns this lane, alongside tools like Fireflies and Granola. Success looks like an accurate transcript with the action items pulled out.
NotebookLM sits in a third, narrower lane: interrogating a fixed set of documents. It is a research surface, not a daily capture tool.
The practical consequence is that feature counts are the wrong buying criterion. Buy for your primary bottleneck. If you leave meetings without remembering what you agreed, no amount of bidirectional linking will help. If your problem is 2,000 unsorted notes, a transcription tool will not fix it. This framing also explains the cheapest sensible stack for people who need both, covered further down.
Which tool should you choose for your situation?
- Solo knowledge worker who wants zero setup: Mem Pro. Capture and let the AI tag and resurface. $8.33/month annually.
- Meeting-heavy professional: Otter Pro. Auto-joining, searchable transcripts, summaries. $8.33/month annually.
- Team that wants one workspace: Notion Business. AI search across the whole workspace plus meeting notes. $20/user/month annually.
- Privacy-focused developer or second-brain practitioner: Obsidian free, with a community AI plugin and your own model. See our Claude and Obsidian persistent memory guide for a working setup.
- Student or researcher working from documents: NotebookLM. Everything you need at $0.
- Small team needing both meetings and a knowledge base: Otter Pro ($8.33) plus Notion Plus ($10/user/month annual) is roughly $18.33/user/month. That is less than Notion Business alone, with better meeting capture. The tradeoff is you lose Ask Notion workspace-wide AI search.
What does Notion AI actually cost in 2026?
Notion's AI layer adds Ask Notion (search across everything you have access to), AI Meeting Notes, drafting inside pages, Enterprise Search across connected apps, and agents that can carry out multi-step work.
Pricing as of 4 August 2026: Free at $0 with a limited AI trial allocation. Plus at $10/user/month annually or $12 monthly, also with only a trial allocation of AI. Business at $20/user/month annually or $24 monthly, which is the cheapest tier with full AI. Enterprise is custom-priced and adds zero data retention. Custom agents are billed separately at $10 per 1,000 Notion credits on top of any plan, a change that took effect 4 May 2026.
The important detail many comparison pages still get wrong: the standalone $10/month AI add-on was retired in May 2025. You can no longer bolt AI onto a cheap plan. That reframes the value question. At $20/user/month you are buying a workspace with AI inside it, not an AI note-taker.
Strengths: the AI has genuine context because your projects, docs and meeting notes already live there. Templates and integrations are mature.
Honest limitations: no local or offline mode, so an unreliable connection means no notes. There is no way for a solo user to buy just the AI. And a five-person team on Business is $100/month annually billed, which is a real budget line for a small business. If your workspace is thin, the AI has little to search and the value drops sharply.
Is Otter.ai still the best meeting transcription tool?
For live transcription of calls, yes. OtterPilot joins scheduled Zoom, Google Meet and Microsoft Teams meetings from your calendar, transcribes in real time with speaker identification, and produces a summary with action items afterwards.
Pricing as of 4 August 2026: Free at $0 with roughly 300 minutes per month and a 30-minute cap per conversation. Pro at $16.99/month monthly or $8.33/month annually, with roughly 1,200 minutes per month and a 90-minute conversation cap. Business at $30/user/month with unlimited meetings, a four-hour conversation cap, admin controls and CRM integrations. Enterprise is custom, adding SSO and compliance features.
One thing worth knowing before you upgrade: transcription accuracy is the same on every tier. Paying more buys volume, longer conversations and admin features, not a better transcript. If accuracy on your accents or jargon is the problem, a higher plan will not fix it, so test the free tier on a real meeting first.
The free tier's real constraint is the 30-minute per-conversation cap, not the monthly minutes. A typical one-hour weekly review gets cut in half. That single limit pushes most professional users to Pro faster than the minute budget does.
Honest limitations: Otter is a meeting recorder, not a knowledge base. AI Chat is capped at around 20 queries per month on free. Business at $30 per seat escalates quickly. And recording other people carries consent obligations that vary by jurisdiction, so check your local rules and tell participants.
What makes Mem different from Notion and Obsidian?
Mem's premise is that you should never organise anything. You capture notes, and AI tags, categorises and links them, then resurfaces related material when it is relevant. Search is natural language rather than folder navigation.
Pricing as of 4 August 2026: Free with roughly 25 items per month. Pro at $14.99/month monthly or $8.33/month annually, which includes unlimited notes, AI chat over your notes, AI organisation, 100 GB storage, unlimited file upload, and web plus iOS access. Teams pricing is custom and adds a shared knowledge base, group billing and SLAs.
Mem 2.0 shipped in early 2026 as a rebuilt engine addressing the speed and sync complaints that dogged the original. If you tried Mem before and left, the version you used is not the version being sold now.
Strengths: genuinely the lowest-friction capture of the five. Imports from Notion and Evernote work, so migrating is not a rewrite.
Honest limitations: there is no Android app, which rules it out for a large share of users. The integration ecosystem is small next to Notion's. You also give up structural control: if you want a deliberate hierarchy or a database view, Mem is the wrong tool. It is a smaller company than Google or Notion, which is a reasonable consideration for notes you expect to keep for a decade.
Why do developers and privacy-focused users pick Obsidian?
Obsidian stores notes as plain Markdown files on your own disk, with bidirectional links, a graph view, and more than 4,300 community plugins. Nothing needs to touch a server.
Pricing as of 4 August 2026: the core app is free for personal and commercial use. Since February 2025 the previous $50/user/year commercial licence became optional and voluntary, so using Obsidian at work costs nothing. Optional add-ons: Sync at $4/month annually or $5/month monthly for end-to-end encrypted cross-device sync, and Publish at $8/month annually or $10/month monthly to publish notes as a website. Catalyst is a $25-plus one-off donation for early access builds, and unlocks no features.
The AI story is different from the others: Obsidian ships no built-in AI. You add it through plugins such as Smart Connections, Copilot or Text Generator, or by pointing an external agent at the vault. That means you choose the model and provider, and you pay API costs directly. Our roundup of free AI API providers covers ways to keep that bill near zero, and the best free AI agent tools list includes agents that work well against a local vault.
Strengths: total data ownership, no lock-in, full offline operation, and the largest plugin ecosystem of the five.
Honest limitations: setup is work. Expect an hour or two to get plugins, keys and sync configured, and ongoing maintenance when a plugin breaks. There is no real-time collaborative editing. Sync is paid, though iCloud, Dropbox or a Git repository work for free with more fiddling. And it does not record meetings.
Is NotebookLM (Gemini Notebook) really free, and what are the catches?
Yes, and the free tier is unusually complete. NotebookLM was renamed Gemini Notebook in July 2026 and now runs on Gemini 3, but it is the same product. You upload sources, and the AI answers questions grounded in those documents with citations pointing back to the passage it used.
Pricing as of 4 August 2026: free with any Google account, no card and no expiry. The free tier includes 100 notebooks, 50 sources per notebook, 50 chat queries per day, three Audio Overviews per day, three Video Overviews per day, plus Deep Research, mind maps and flashcards. There is no standalone paid version. Higher limits, roughly five times the notebooks and sources plus larger daily caps, arrive through Google AI Pro at $19.99/month, which also bundles Gemini Advanced and 2 TB of storage, or through Google Workspace plans.
The design tradeoff: the limits are volume gates, not feature gates. That is rare, and it is why NotebookLM is the honest answer to "what is the best free option".
Honest limitations: it only reasons over sources you upload, so it is not a daily capture tool. There is no bidirectional linking, no meeting recording and no personal knowledge management layer. Google Drive and Docs integration is excellent, which is also a dependency if you work outside that ecosystem.
A quick scoring rubric before you pay
- Meetings per week × how often you forget commitments → Otter.
- Number of unsorted notes × how much you hate filing → Mem.
- Team size × how much documentation already lives in one place → Notion.
- Sensitivity of your notes × your willingness to configure software → Obsidian.
- Volume of PDFs and reports you must digest × deadline pressure → NotebookLM.
One observation worth budgeting for: migration cost is asymmetric. Leaving Obsidian is trivial because your notes are already Markdown files on disk. Leaving Notion or Mem means an export and a cleanup pass. If unsure, starting local and moving up is cheaper than the reverse.
What are the credible alternatives?
- Fireflies.ai — closest Otter competitor, stronger CRM and revenue-team workflows.
- Granola — Mac-first meeting notes that enhance what you typed rather than producing a raw transcript.
- Evernote — mature capture and web clipping, weaker AI than this group.
- Apple Notes — free, fast, and increasingly capable on-device; see our on-device AI assistant guide for Mac.
- Logseq — outliner alternative to Obsidian, also local-first and free.
- Microsoft OneNote with Copilot — sensible default if your organisation already pays for Microsoft 365.
FAQ
Q: What is the cheapest AI note-taking app in 2026? A: NotebookLM (Gemini Notebook) and Obsidian both cost $0. NotebookLM gives you every feature free with daily volume caps; Obsidian's app is free but you supply your own AI plugin and API key. Among conventional paid plans, Mem Pro and Otter Pro tie at $8.33/month on annual billing.
Q: Is Notion AI worth $20 per user per month? A: It is worth it if your team already keeps its documentation in Notion, because Ask Notion search only helps when there is a lot to search. Since the standalone $10 AI add-on was retired in May 2025, Business is the cheapest tier with full AI, so solo users wanting AI alone should look elsewhere.
Q: Otter vs Notion AI for meeting notes? A: Otter for accuracy and reliability, since OtterPilot joins calls automatically and transcribes live with speaker identification. Notion AI Meeting Notes is more convenient when the notes need to sit beside the related project, but Otter remains the stronger dedicated transcriber.
Q: Is there a genuinely free option with no time limit? A: Two. NotebookLM's free tier has no expiry with no card required, and Obsidian's core app is free for personal and commercial use following the February 2025 licence change. Otter, Notion and Mem all have free tiers, but each is capped in ways that push regular users to pay.
Q: Obsidian vs Mem for personal knowledge management? A: Mem if you want the software to organise for you and accept a cloud service with no Android app. Obsidian if you want ownership, offline access and plugin flexibility, and are willing to spend an hour or two on setup plus your own AI costs.
Q: Can I combine tools instead of buying one that does everything? A: Yes, and it is often cheaper. Otter Pro at $8.33/month plus Notion Plus at $10/user/month is around $18.33/user/month, below Notion Business, with better transcription. The tradeoff is losing workspace-wide AI search. If you are building a solo practice, the stack matters as much as the tool; our guide to starting a one-person AI consulting business covers that budgeting.
Last verified: 4 August 2026. All prices were checked against the vendors' own pricing pages on that date and are quoted in the currency each vendor lists. Pricing in this category changes often, sometimes mid-quarter, so confirm on the official page before purchasing. Where a figure is described as approximate, the vendor states it as a guideline rather than a hard number.
Corrections log: No corrections issued yet. Material factual changes will be listed here with the date.
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