Trust Score: How to Evaluate AI Tool Reliability in 2026

How do you judge that an AI tool is reliable before adopting it? With tens of thousands of tools on the market and aggressive marketing from every vendor, sorting becomes impossible without a rigorous evaluation framework. That's exactly the role of the **Trust Score** we publish on Trust-Vault.

## The 4 Pillars (25 points each)

Our score is built on four dimensions, each scored out of 25 points, for a total of 100.

### 1. Privacy (25 points)
- GDPR/RGPD compliance
- Server location, encryption at rest and in transit
- Privacy policy clarity and accessibility
- User rights effectiveness (access, rectification, deletion, portability)
- Subcontractor transparency and non-EU transfers

### 2. Reliability (25 points)
- Advertised feature reliability
- Output quality, precision, and consistency
- Verified user satisfaction (weighted average by review volume)
- Uptime, response time, incident management
- Customer support responsiveness and quality

### 3. Security (25 points)
- Certifications: SOC 2 Type II, ISO 27001, HIPAA where applicable
- Encryption (TLS 1.2+ in transit, AES-256 at rest)
- MFA, access control, logging
- Bug bounty program or third-party audits
- Known breach history and post-incident communication

### 4. Transparency (25 points)
- Pricing clarity (displayed prices, no hidden fees)
- Documentation, user guides, API docs, public changelog
- Open source code and accepted contributions
- Regular communications, blog, public roadmap
- Terms of service: readable, balanced, dated

## The Formula

```
Trust Score = Privacy (25) + Reliability (25) + Security (25) + Transparency (25)
```

The score is an integer between 0 and 100, **recalculated weekly** to integrate new data.

## Score Interpretation

| Range | Level | Reading |
|-------|-------|---------|
| 85-100 | Excellent | Maximum trust, excels across all 4 pillars |
| 70-84 | Very good | Strong guarantees, minor improvement areas |
| 50-69 | Good | Reliable but identified gaps |
| 25-49 | Average | Some positive signals, significant weaknesses |
| 1-24 | Low | Few guarantees — use with caution |
| 0 | Not rated | Insufficient data |

## Our Independence Commitment

- **No pay-for-ranking**: no vendor can pay to improve their Trust Score
- **Affiliate disclosure**: our affiliate links are identified and don't influence scores
- **Editorial independence**: editorial team separate from the commercial team

## How to Use It Practically

- A **high score** is a good starting point but doesn't replace your own due diligence
- For **sensitive professional use**, don't go below 70
- Cross it with your sector constraints and your DPO/CISO requirements

For the complete tool catalog evaluated with this methodology, see our [Trust-Vault home page](/en/) and our [methodology page](/en/pages/methodology).