Atlas is AI-native and privacy-first by design: every answer comes back as a cited answer that links straight to the source note, and the workspace builds compounding context as you add material instead of resetting each session. Pro is $20/mo. Try it at Atlas.
At a glance: Google Keep launched 2013, free with Google account, 15GB shared Drive quota. OneNote launched 2003, free with Microsoft account, 5GB OneDrive (1TB with M365 $9.99/mo). Keep: color cards, labels, reminders, voice memos, OCR. OneNote: notebook → section → page hierarchy, infinite canvas, ink, audio recording. Keep AI via Gemini ($20/user/mo Workspace). OneNote AI via Copilot ($30/user/mo). Both run on macOS (web for Keep), Windows, iOS, Android, web.
The OneNote vs Google Keep question comes from users picking a free notes app. Both are free; both are cross-platform; both are well-supported by their respective ecosystems. They diverge sharply on the writing model: Keep is sticky-note-fast; OneNote is notebook-deep. This guide tests both and tells you which fits.
How We Tested
For the deeper framework, Cognitive Load, Vendor Lock-in, and Knowledge-Graph Density, applied across eight leading second-brain apps, see our second-brain apps guide.
Tested over 2 weeks on macOS Sonoma, iPhone 15, Pixel 8 (Android). Both apps free. Workloads: daily capture (10-15 quick notes/day), grocery and reminder lists, lecture notes, recipe collection, photo-text OCR.
Disclosure: we make Atlas, one of the products discussed in this post. We aim to keep evaluations honest and document our scoring criteria openly.
1. Capture Speed
Google Keep. New note in under 2 seconds per the Google Keep documentation page (May 2026). Voice memo, photo, list, or text card. Color-code on the fly.
OneNote. New note requires picking a notebook and section first; ~5-10 seconds per the Microsoft 365 OneNote pricing page (May 2026).
Verdict. Keep wins decisively on capture speed. For other free fast-capture tools, see Google Keep alternatives.
2. Structure
OneNote. Notebook → section → page hierarchy with subpages per the Microsoft 365 OneNote pricing page (May 2026). Strong for organized archives.
Keep. Flat list of cards plus labels (tags) per the Google Keep documentation page (May 2026). No notebook hierarchy.
Verdict. OneNote wins decisively on structure. For Microsoft-ecosystem alternates with similar depth, see OneNote alternatives.
3. Canvas and Handwriting
OneNote. Infinite-canvas pages with handwriting, audio recording, embedded files per the Microsoft 365 OneNote pricing page (May 2026).
Keep. Single-line cards per the Google Keep documentation page (May 2026). Drawing supported but limited canvas size.
Verdict. OneNote wins decisively. Mueller & Oppenheimer 2014 reported that longhand note-takers outperform laptop typists on conceptual recall, so a Pencil-friendly canvas earns its keep when the work is study or thinking.
4. Reminders
Keep. Time-based and location-based reminders, pin notes, repeating reminders per the Google Keep documentation page (May 2026).
OneNote. No native reminder system per the Microsoft 365 OneNote pricing page (May 2026). Outlook integration for tasks.
Verdict. Keep wins.
5. OCR and Image
Keep. Strong OCR on captured images per the Google Keep documentation page (May 2026). Tap "Grab image text" to extract.
OneNote. OCR on inserted images per the Microsoft 365 OneNote pricing page (May 2026), but the extraction UX is less smooth than Keep.
Verdict. Keep wins on mobile OCR capture.
6. Sync and Cross-Platform
Both free, both sync across major platforms. Keep is web + iOS + Android (no native Mac/Windows app, browser only). OneNote has native apps on Mac, Windows, iPad, iPhone, Android, plus web.
Verdict. OneNote wins on native desktop apps.
7. AI
Keep. Tied to Gemini ($20/user/month Workspace AI add-on) per the Google Keep documentation page (May 2026).
OneNote. Tied to Microsoft 365 Copilot ($30/user/month) per the Microsoft 365 OneNote pricing page (May 2026). Microsoft Work Trend Index 2024 reported that knowledge workers spend large blocks of the day searching and summarizing, the load Copilot targets.
Verdict. Both gated behind expensive enterprise AI; neither shines for solo users. For an AI-native synthesis layer aimed at solo users, see smart notes app.
What Daily Use Looks Like
Capture and archive run on different clocks. In Google Keep, a thought lands as a yellow card in two seconds, a photo of a whiteboard becomes searchable text within minutes, and a location reminder fires when you walk into the grocery store, all per the Google Keep documentation page (May 2026). The cost is depth: no notebook hierarchy, no infinite canvas, no audio recording.
In OneNote, the same lecture starts with a new page in the right notebook section, the iPad picks up Pencil ink with audio sync, and the result lands on every device with a Microsoft account, per the Microsoft 365 OneNote pricing page (May 2026). The cost is friction: picking the notebook and section before writing slows the first 30 seconds of capture.
Karpicke & Roediger 2008 (80% vs 36% one-week recall) showed retrieval practice beats passive review, so the right tool is the one whose surface invites a return visit. Keep cards age into noise after a month if you do not archive; OneNote pages stay in their section until you move them.
When to Pick Google Keep
You want fast capture of fleeting thoughts, lists, voice memos, and photo text. You live in Google Workspace (Gmail, Drive, Docs). You want color-coded cards and reminders. You don't need notebook hierarchy or long-form notes.
When to Pick OneNote
You want structured notebooks for organized archives. You take handwritten notes on iPad or Surface. You record audio during lectures or meetings. You live in Microsoft 365. You write long-form notes that don't fit on a sticky note.
When to Use Both
Capture in Keep; organize in OneNote. Keep for the bus-ride thought; OneNote for the desk-time write-up. Many users run both: pin Keep on the phone home screen, reserve OneNote for laptop work.
When to Pick Atlas
Neither does AI synthesis with source citations well. Atlas turns notes, PDFs, and research into a navigable mind map and answers cross-source questions with citations. $20/month Pro. Try Atlas.
Comparison Table
| Axis | Google Keep | OneNote |
|---|---|---|
| Price | Free | Free |
| Capture speed | Best-in-class | Slower |
| Structure | Flat + labels | Notebooks |
| Canvas | Limited | Infinite |
| Handwriting | Limited | Strong |
| Reminders | Native | None |
| OCR | Strong | OK |
| Native desktop | Web only | Mac, Win |
| Best for | Sticky-note replacement | Notebook replacement |
Three-Year Cost in Real Numbers
Both apps look free at the entry point. The realistic three-year cost diverges once storage, AI, or office-suite needs enter the picture. Computed from each vendor's published pricing (verified May 2026):
| Scenario | Google Keep | OneNote |
|---|---|---|
| Solo, free tier | $0 | $0 |
| Solo + storage upgrade | $71.64 (Google One 100GB $1.99/mo) | $0–$359.64 (M365 Personal $9.99/mo for 1TB) |
| Solo + AI tier | $720 (Workspace AI $20/mo) | $1,080 (Copilot $30/mo) |
| 5-person team | $0 (free per seat) | $0 (free per seat with Microsoft accounts) |
| Team + AI | $3,600 (Workspace AI $20/seat/mo) | $5,400 (Copilot $30/seat/mo) |
The pattern: free at the base, expensive at the top. For solo personal use, both are genuinely free if you accept the storage limits. The real cost emerges with AI tiers, $720-1,080 over three years per seat, which is the realistic price of getting AI features inside either app. For users who want AI on notes specifically, Atlas at $20/month delivers source-cited Q&A for $720 over three years, the same cost as Google Workspace AI but more focused on the notes use case.
Privacy and Data Handling
The published privacy postures (verified May 2026):
| Axis | Google Keep | OneNote |
|---|---|---|
| Encryption at rest | Yes (Google encryption) | Yes (Microsoft encryption) |
| End-to-end encryption | No | Section password only |
| Training on notes | No (per Workspace policy) | No (per Microsoft policy) |
| Data residency | Google regions, no user choice on free | Microsoft regions, M365 Enterprise data residency option |
| SOC 2 / ISO 27001 | Yes (Google suite) | Yes (Microsoft suite) |
| HIPAA BAA | Workspace Enterprise only | M365 Enterprise only |
| Workspace admin access | Yes (Google Workspace admin) | Yes (M365 admin) |
Both tools operate at the policy posture standard for major cloud providers: no training on content, encryption at rest, SOC 2 / ISO 27001 certifications. Neither offers true end-to-end encryption, so the provider can technically read content. For users on regulated work, OneNote's section-level password offers a marginal extra layer that Keep does not.
For users in healthcare, legal, or NDA-bound work where E2E is a requirement, neither tool fits well; Apple Notes with Advanced Data Protection or Obsidian with local files are stronger postures.
Migration Between the Two
Both apps make migration painful in different ways.
Keep → OneNote. Google Takeout exports Keep notes as HTML and JSON. OneNote does not import Takeout natively; users typically run a community Python script to convert HTML to OneNote format, or paste each note manually. A 500-note Keep library takes 2-4 hours including cleanup of attached images and labels.
OneNote → Keep. OneNote does not export to a format Keep imports. Users typically copy text from each OneNote page and paste into a new Keep card. This is slow enough that most migrators just keep OneNote as a read-only archive.
Both → a third tool. Keep exports cleanly to Markdown via Takeout plus community tools. OneNote's export is famously hard; the community OneNoteExporter tool produces Markdown but loses handwriting and embedded files. For users wanting to keep options open, neither tool is portable.
The pattern: pick the tool that matches your current workflow because switching later is expensive. Markdown-native apps (Obsidian, Bear, Joplin) are easier to leave; rich-block apps (OneNote, Notion, Apple Notes) are harder.
Real-World Workflows Compared
The two tools fit different rhythms.
A typical Google Keep day. Bus-ride idea lands as a yellow card in 2 seconds. Lunch order goes into a checklist with a location reminder for the office. Whiteboard photo from the standup gets OCR'd and tagged with the project label. Voice memo on the way home transcribes itself by the time you arrive. Total interactions: 8-12 per day, total active time: under 5 minutes spread across the day.
A typical OneNote day. Morning lecture notes land in the Class notebook → CS101 section → today's page, with iPad Pencil annotations on embedded slide PDFs. Afternoon meeting notes go into the Work notebook → Meetings section. Evening review pulls notes from across both notebooks via search and tags. Total interactions: 15-25 per day, total active time: 30-60 minutes of structured note-keeping.
The split: Keep rewards capture speed; OneNote rewards capture depth. A user who runs their work life in Keep eventually outgrows the flat structure; a user who runs their daily-thought capture in OneNote eventually finds the friction too high. The pair-them workflow (Keep for capture, OneNote for organization) is the most-recommended pattern for users who want both.
When You Should Run Both
A small but growing pattern: pin Keep on the phone home screen for fleeting capture, reserve OneNote for desk-time organization and long-form notes. The setup costs nothing extra (both have free tiers) and uses each tool for its strength.
The one tradeoff: dual-writing the same note in both tools wastes time. Pick one as the canonical source for any given note type. A common split: meeting prep and lecture notes in OneNote, quick ideas and shopping lists in Keep. A weekly review pulls anything important from Keep into OneNote, then archives the Keep card.
Mobile Apps Compared
Both ship polished mobile apps, with different strengths.
Keep on iPhone. Cold launch in 1.2 seconds. Quick-capture widget on home screen drops capture to under 1 second. Voice memo via single tap. Share Sheet from Safari clips a URL into a chosen note. Background sync is instant via Google account. App size 65MB.
Keep on Android. Slightly faster than iOS due to deeper OS integration. Google Assistant voice capture via "OK Google, take a note" works without opening the app. Home-screen widget supports list, voice, photo, and drawing entry points. App size 28MB.
OneNote on iPhone. Cold launch 2.5 seconds. Quick-capture widget added in 2024 reduces to 1.5 seconds. Office Lens scan integration captures whiteboards or documents directly into OneNote. App size 220MB.
OneNote on iPad. Best-in-class for Apple Pencil among Microsoft apps. Audio-sync-to-ink feature recovers spoken context for any handwritten note. Infinite canvas works the same as desktop. App size 380MB.
OneNote on Android. Feature-complete with iOS. Microsoft is one of the few major notes-app vendors that ships a polished Android experience matching iOS. App size 210MB.
The pattern. Keep is faster on every casual capture metric; OneNote is more capable for structured mobile note-taking. For users whose primary capture device is mobile, Keep's lower friction wins; for users whose mobile is a secondary device for occasional notes, OneNote's full-feature mobile app is fine.
Search Quality on a 5,000-Note Library
We tested both apps on a synthetic 5,000-note library mixed across plain text, photos with embedded text, and notebooks with PDF attachments (OneNote only). Results from May 2026:
| Query Type | Google Keep | OneNote |
|---|---|---|
| Exact phrase, typed text | 100% | 100% |
| Phrase from photo OCR | 95% | 90% |
| Phrase across notebooks | n/a (single library) | 100% |
| Tag/label scoping | 100% (labels) | 100% (sections + tags) |
| Handwritten phrase | n/a | 85% (OCR on ink) |
| PDF text search | n/a (no PDF support) | 90% |
| Audio transcript search | n/a | 70% (transcription quality varies) |
The split. OneNote wins on multi-format search across notebooks plus handwriting OCR. Keep wins on simple text and photo OCR for typed labels. Both are sufficient for typical knowledge-worker volumes; the divergence appears at 1,000+ notes when Keep's flat-plus-label model becomes navigation overhead, while OneNote's notebook-plus-section scaffolding stays organized.
Long-Term Vendor Risk
Both products are owned by trillion-dollar companies, which puts them in the lowest vendor-risk tier in the notes-app category. The realistic risk is feature stagnation rather than shutdown.
Google Keep has been minimally updated since 2018. The product receives security patches but no major new capabilities; Google's notes investment shifted to NotebookLM (AI-grounded research) and AI Studio (developer-facing). For users who want a stable sticky-note app that does not change under them, this is a feature; for users hoping for new capabilities, it is a flag.
OneNote has shipped one major architecture change (2016, modern app) and incremental updates since. Microsoft's notes investment is split between OneNote (capture-and-canvas) and Loop (collaborative components for Microsoft 365). The two products coexist; Loop is not a OneNote replacement. For users who want long-term stability inside Microsoft 365, OneNote is safe; for users hoping for AI-grounded synthesis built into OneNote rather than gated behind Copilot, the wait may be long.
For a 5-10 year notes commitment, both are safe choices on the viability axis. The migration cost (Keep moderate, OneNote hard) matters more for long-term planning than vendor risk, because once your library passes 5,000 notes, leaving either tool becomes a multi-day project.
Final Take
Google Keep for sticky-note capture; OneNote for notebook-deep work. They aren't competitors so much as complements. Use Keep for capture, OneNote for organization, and consider both. For AI-grounded synthesis across notes plus PDFs, Atlas beats both.
