Six AI chat apps for keeping long-running project context on Android in 2026
An XDA writer recently switched from ChatGPT, Gemini, and Perplexity to just Claude, and the reason was Projects: a workspace where reference docs, past conversations, and custom instructions live together and stay in scope across chats. That is the feature most casual AI users still miss. The best apps for AI chat with project context on Android carry that idea into a phone-first workflow: less prompt copy-pasting, more work getting done in the app itself.
We ran six mainstream AI apps against the same test: can you point the model at a folder of notes, a PDF, or a running project, and get useful, grounded answers days later without re-pasting everything. All six can do this to different degrees. Here is who wins for which job.
What to look for in an AI chat app with project context
- Persistent workspace. A place to keep files, notes, and instructions that carries across chats.
- File uploads. PDFs, spreadsheets, and code files that the model can actually read on the phone.
- Custom instructions. A place to say "always answer in bullets" or "assume the client is on Rails 8" once.
- Search over past chats. The context lives in old conversations; the app needs to find it.
- Fair free tier. Some of the value shows up only after weeks of use; a free tier that still respects that pays off.
Quick comparison
| App | Best for | Free plan | Project workspace | File upload |
|---|---|---|---|---|
| Claude | Projects with heavy context | Yes | Yes, first-class | Yes |
| ChatGPT | Familiar assistant with GPTs | Yes | Yes, via Projects and GPTs | Yes |
| Perplexity | Research with sources | Yes | Yes, Spaces | Yes |
| Microsoft Copilot | Office document workflows | Yes | Via Microsoft 365 | Yes |
| Google Gemini | Gems and Workspace tie-in | Yes | Gems (custom experts) | Yes |
| Notion AI | Notes plus AI in one app | Limited | Yes, whole workspace is context | Yes |
1. Claude, best for projects with heavy context
Claude by Anthropic is the app that made the "project context" conversation front-of-mind. Projects hold reference PDFs, notes, and long chats in one workspace with per-project custom instructions. Long-context answers stay grounded in what you have loaded, and the Android app carries the same Projects across desktop and phone. Recent releases added file editing and connectors that pull in email or docs when you choose to allow it.
Where it falls short: the free tier limits messages per day and free Projects have smaller file allowances. Serious project use asks for the paid tier.
Pricing: free tier available; a paid subscription unlocks larger context and more usage.
Platforms: Android, iOS, web, macOS, Windows.
Bottom line: the pick for anyone who has a real, ongoing project with source documents to lean on.
2. ChatGPT, best familiar assistant with GPTs
ChatGPT covers the same ground with Projects (a workspace for files and instructions) plus GPTs (customised assistants that anyone can build and share). The Android app carries voice, image input, and file uploads. Projects are the closest match to Claude's approach on the same phone screen.
Where it falls short: the free tier caps advanced-model usage and Projects file allowances are smaller than the paid tier. Advanced Voice Mode is still gated.
Pricing: free tier available; a paid subscription unlocks advanced models and higher limits.
Platforms: Android, iOS, web, macOS, Windows.
Bottom line: the pick for anyone who wants an ecosystem of custom GPTs alongside their own projects.
3. Perplexity, best for research with sources
Perplexity approaches project context from a research angle. Spaces let you group threads, upload files, and set custom instructions, and every answer comes with citations. For long-running research projects (say, tracking a topic across weeks) the source-link discipline is the clearest advantage over the general assistants.
Where it falls short: Perplexity leans heavily on web search grounding, so tasks that need pure creative writing or long reasoning without citations feel less at home.
Pricing: free tier available; Perplexity Pro unlocks Spaces file allowances, image gen, and heavier usage.
Platforms: Android, iOS, web, macOS.
Bottom line: the pick when the project is research and the sources matter as much as the answer.
4. Microsoft Copilot, best for Office document workflows
Microsoft Copilot is the practical answer when the project lives in Word, Excel, and Outlook. On a phone the Copilot app can summarise inboxes, draft replies, and pull context from OneDrive files. The Microsoft 365 integration means the "project" you refer to is often the actual document library, not a hand-curated workspace.
Where it falls short: most of the deep integration lives inside the paid Microsoft 365 tier. The standalone free app is a lighter experience.
Pricing: free tier available; Microsoft 365 Copilot is a paid add-on.
Platforms: Android, iOS, web, Windows, macOS.
Bottom line: the pick when the project is really a Microsoft 365 workspace. Skip it otherwise.
5. Google Gemini, best for Gems and Workspace tie-in
Google Gemini uses Gems (custom experts) as its take on project context. Each Gem carries its own persona, instructions, and reference files, and the Android app switches between them on a small chip UI. The Workspace integration reads from Gmail and Drive with permission, which is the practical draw for anyone whose "project" already lives in Google's ecosystem.
Where it falls short: Gem file uploads are more limited than Claude Projects or ChatGPT Projects on the paid tiers.
Pricing: free tier available; Gemini Advanced (as part of Google AI Pro) unlocks larger context and more usage.
Platforms: Android, iOS, web.
Bottom line: the pick for anyone already living in Gmail and Drive. Skip it if the project files live outside Google.
6. Notion AI, best for notes plus AI in one app
Notion AI flips the model: instead of adding project context to a chat app, it adds a chat app to your project notes. Every page in a Notion workspace is fair game as context, so questions like "what did I decide about pricing last month" get grounded answers from your own database. The Android app has grown into a serious writer and Q&A layer for long-running documents.
Where it falls short: Notion AI adds a per-seat charge on top of the base plan, and it works best when the workspace is already well organised.
Pricing: a modest per-user monthly add-on to any Notion plan.
Platforms: Android, iOS, web, macOS, Windows.
Bottom line: the pick when your project already lives in Notion. Skip it if adding another workspace is not on.
How to pick the right one
- If you want the strongest Projects feature: Claude.
- If you want a familiar assistant with GPTs on top: ChatGPT.
- If your project is a research topic: Perplexity.
- If your workflow is in Office: Microsoft Copilot.
- If your workflow is in Gmail and Drive: Google Gemini.
- If your notes already live in Notion: Notion AI.
FAQ
What is a "project" in an AI chat app? A workspace that holds files, custom instructions, and past chats together so the model has consistent context. It saves the round-trip of pasting the same background into every new chat.
Are Claude Projects private? Anthropic states that consumer conversation data in Projects is not used to train models by default. Enterprise plans have separate data controls.
Which AI chat app is best on the free tier? Claude for Projects and Perplexity for research both offer usable free tiers. ChatGPT is generous with volume but caps advanced-model access.
Can I attach PDFs to project chats on Android? Yes, in Claude, ChatGPT, Perplexity, and Microsoft Copilot. Gemini supports file attachments but with tighter size limits on Android.
Do any of these work offline? No. All rely on cloud inference. If offline chat is a hard requirement, look at on-device LLM apps instead.
