Project and task management decision
Microsoft 365 Personal
Do not rebuild: a small team could implement basic storage and an editor, but Microsoft's durable advantages (global infra and brand, plus proprietary Copilot integration) provide most of the product's value and are impractical to replicate.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Provide user auth, store and serve personal documents in cloud storage, edit/view documents in a web editor, and surface AI assistant suggestions inside the editor.
What it still won’t have
- Microsoft’s proprietary Copilot models and tight integration across Microsoft apps
- Global-scale infrastructure, SLAs, and enterprise-grade uptime
- Deep desktop app integrations and native Office features
- Continuous feature updates, security patches, and compliance guarantees
What remains hard
- Infrastructure at scale
Microsoft 365 delivers cloud storage, advanced security, and Microsoft Copilot in your favorite apps—all in one plan.
- Brand trust
Microsoft – AI, Cloud, Productivity, Computing, Gaming & Apps
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 11 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal self-hosted personal productivity suite using: Next.js (React) frontend, PostgreSQL for metadata, S3-compatible object storage (e.g. DigitalOcean Spaces), FastAPI backend (Python) for API, and OpenAI-compatible LLM API for assistant features. In scope: user auth (email/OAuth), upload/download file storage, a basic rich-text editor with save/load, API endpoints to call an LLM and return inline suggestions, simple versioning, and background worker for saves. Out of scope: full Office file format fidelity, exchange/calendar sync, enterprise compliance. Include error handling, input validation, automated tests for API endpoints, and deployment docs (Docker Compose + cloud provider instructions).
How we checked
How the score was reached
- Pay verdict base20
- An open-source build was found+5
- 3 cited sources+3
- Hard moats found in the evidence-3
- Evidence score25
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productMicrosoft – official product page
- open sourcecryptpad/cryptpad
- open sourceONLYOFFICE/CommunityServer
Integrity checks
What held up, and what did not.
