For a legal team testing document review workflows, the best free options are usually the ones that let you:

• upload or simulate a document set
• assign review decisions/tags
• search/filter efficiently
• export results or notes
• work with a small team without much setup

Here are the best free or free-tier platforms to consider:

1. Google Drive + Google Sheets

Best for: very simple workflow prototyping

Why it’s useful

• Easy to upload docs and share with a team
• Sheets can act as a lightweight tagging/review log
• Comments and version history are useful for testing collaboration

Limitations

• Not a true legal review platform
• Weak for large-scale tagging, issue coding, or privilege workflows
• Manual and easy to get messy

2. Airtable

Best for: structured tagging and workflow testing

Why it’s useful

• Excellent for custom fields like “Responsive,” “Privileged,” “Issue Code,” “Reviewer”
• Easy filtering, views, and sorting
• Good for simulating review queues and assignment workflows

Limitations

• Free plan has record and automation limits
• Not designed for native document review at scale
• File handling is basic compared with eDiscovery tools

3. Notion

Best for: lightweight internal workflow tracking

Why it’s useful

• Flexible databases for tags, statuses, and reviewer notes
• Good for documenting review protocols and testing process steps
• Easy to collaborate

Limitations

• Not ideal for bulk document review
• Search and tagging are fine, but not eDiscovery-grade
• Free plan is limited for team use and file uploads

4. Zoho WorkDrive + Zoho Sheet/Zoho Creator

Best for: teams wanting a more “app-like” free setup

Why it’s useful

• Can build simple custom review forms and tagging processes
• Better structure than spreadsheets alone
• Good if you want to prototype a legal intake/review process

Limitations

• More setup effort
• Not a dedicated review platform
• Free tiers vary and may be restrictive

5. Label Studio

Best for: document classification/tagging experiments

Why it’s useful

• Open-source and free
• Good for testing labeling workflows, classification, and annotation
• Can support custom tag sets and reviewer instructions

Limitations

• More technical to set up
• Not built specifically for legal review
• Better for content labeling than attorney-style review

6. Doccano

Best for: text classification and annotation testing

Why it’s useful

• Free and open-source
• Good for tagging text excerpts or documents
• Useful for prototyping coding schemes and reviewer consistency

Limitations

• Best for text annotation, not full document review
• Requires some technical setup
• Not purpose-built for legal privilege/relevance review

7. DOCReview-style open-source tools or self-hosted review apps

Best for: teams with technical support

Examples vary, but self-hosted review systems can be useful if you want:

• custom tag fields
• reviewer assignment
• audit trails
• controlled access

Limitations

• Usually require installation/admin support
• User experience may be rough
• Maintenance burden is higher

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Best options by use case

If you want the easiest no-cost option:

• Airtable
• Google Sheets + Drive

If you want something more like a review database:

• Airtable
• Notion

If you want open-source labeling/testing:

• Label Studio
• Doccano

If you want to test legal review logic, not production review:

• Airtable
• Google Sheets
• Notion

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What to look for in a testing platform

For legal workflow testing, prioritize platforms that support:

• multi-tag coding
• reviewer assignment
• status tracking like first pass / QC / final
• search and filter
• export to CSV
• comments or notes
• access control
• audit trail or revision history

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Practical recommendation

If your goal is to test a legal review workflow quickly, I’d start with:

1. Airtable for structured review/tagging simulation
2. Google Drive + Sheets for the simplest collaboration test
3. Label Studio if you want open-source labeling and are okay with setup

If you want, I can also give you:

• a comparison table
• a recommended setup for a legal review pilot
• or a sample tagging schema for responsiveness/privilege/issue coding.