---
title: "just-eval vs hallucination-index"
type: "comparison"
canonical_url: "https://www.graphcanon.com/compare/re-align-just-eval-vs-rungalileo-hallucination-index"
tools: ["re-align-just-eval", "rungalileo-hallucination-index"]
---

# just-eval vs hallucination-index

*GraphCanon updated Aug 8, 2026*

## Verdict

Pick just-eval if just-eval provides a straightforward GPT-based framework for evaluating LLMs across multiple dimensions with clear outputs; pick hallucination-index if hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types.

[just-eval](https://allenai.github.io/re-align/) reports 90 GitHub stars, 7 forks, and 2 open issues, last pushed Jan 29, 2024. [hallucination-index](https://www.rungalileo.io/hallucinationindex) has 116 stars, 8 forks, and 1 open issues, last pushed Jul 28, 2025. Figures are from public GitHub metadata via [just-eval's repository](https://github.com/Re-Align/just-eval) and [hallucination-index's repository](https://github.com/rungalileo/hallucination-index).

| | [just-eval](/tools/re-align-just-eval.md) | [hallucination-index](/tools/rungalileo-hallucination-index.md) |
| --- | --- | --- |
| Tagline | A simple GPT-based evaluation tool for multi-aspect, interpretable assessment of LLMs. | Initiative to evaluate and rank popular LLMs based on hallucination propensity |
| Stars | 90 | 116 |
| Forks | 7 | 8 |
| Open issues | 2 | 1 |
| Language | Python | - |
| Adopt for | just-eval provides a straightforward GPT-based framework for evaluating LLMs across multiple dimensions with clear outputs. | Hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types. |
| Persona | - | - |
| Runtime | - | - |
| License | MIT | - |
| Categories | Evaluation & Observability | Evaluation & Observability |

## Trust and health

_Sourced signals - not a safety guarantee. No winner column._

| | [just-eval](/tools/re-align-just-eval.md) | [hallucination-index](/tools/rungalileo-hallucination-index.md) |
| --- | --- | --- |
| Days since push | 921d | 365d |
| Open issues (now) | 2 | 1 |
| Full report | [trust report](/tools/re-align-just-eval/trust.md) | [trust report](/tools/rungalileo-hallucination-index/trust.md) |

## Decision facts: just-eval

- **Adopt for:** just-eval provides a straightforward GPT-based framework for evaluating LLMs across multiple dimensions with clear outputs.

## Decision facts: hallucination-index

- **Adopt for:** Hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types.

## Choose when

### Choose just-eval if…

- Tags unique to just-eval: evaluation, gpt4, llm, llm-eval.
- When your team requires an in-depth yet interpretable evaluation of LLM performance, focusing on various aspects.

### Choose hallucination-index if…

- Tags unique to hallucination-index: hallucinations, large language models, openai, rag.
- Use when you need to ensure accuracy in short-context tasks, as it tests models like Chain-of-Note prompting techniques specifically for such scenarios.
- More GitHub stars (116 vs 90) - visibility, not fit.

## When NOT to use just-eval

- Avoid if direct integration with competing API services is needed as just-eval focuses solely on OpenAI API key configuration.
- Not suitable when your project demands a custom evaluation framework that extends beyond simple GPT-based assessments.

## When NOT to use hallucination-index

- Avoid using Hallucination-Index when your application requires real-time evaluation of hallucinations, as it focuses on predefined tests rather than live model performance.
- Do not rely solely on this index if your primary concern is the latest updates to LLM models; its data might not reflect recent improvements in models or the introduction of new ones.

## Common questions

### What is the difference between just-eval and hallucination-index?

just-eval: A simple GPT-based evaluation tool for multi-aspect, interpretable assessment of LLMs.. hallucination-index: Initiative to evaluate and rank popular LLMs based on hallucination propensity. See the comparison table for live GitHub stats and shared categories.

### When should I choose just-eval over hallucination-index?

Choose just-eval over hallucination-index when Tags unique to just-eval: evaluation, gpt4, llm, llm-eval; When your team requires an in-depth yet interpretable evaluation of LLM performance, focusing on various aspects.

### When should I choose hallucination-index over just-eval?

Choose hallucination-index over just-eval when Tags unique to hallucination-index: hallucinations, large language models, openai, rag; Use when you need to ensure accuracy in short-context tasks, as it tests models like Chain-of-Note prompting techniques specifically for such scenarios; More GitHub stars (116 vs 90) - visibility, not fit.

### When should I avoid just-eval?

Avoid if direct integration with competing API services is needed as just-eval focuses solely on OpenAI API key configuration. Not suitable when your project demands a custom evaluation framework that extends beyond simple GPT-based assessments.

### When should I avoid hallucination-index?

Avoid using Hallucination-Index when your application requires real-time evaluation of hallucinations, as it focuses on predefined tests rather than live model performance. Do not rely solely on this index if your primary concern is the latest updates to LLM models; its data might not reflect recent improvements in models or the introduction of new ones.

### Is just-eval or hallucination-index more popular on GitHub?

hallucination-index has more GitHub stars (116 vs 90). Stars measure visibility, not whether either tool fits your constraints.

### Are just-eval and hallucination-index open source?

Yes - both are open-source projects on GitHub.

### Where can I find alternatives to just-eval or hallucination-index?

GraphCanon lists graph-backed alternatives at [just-eval alternatives](/tools/re-align-just-eval/alternatives) and [hallucination-index alternatives](/tools/rungalileo-hallucination-index/alternatives) ([just-eval markdown twin](/tools/re-align-just-eval/alternatives.md), [hallucination-index markdown twin](/tools/rungalileo-hallucination-index/alternatives.md)), ranked by typed relationship edges rather than popularity votes.

### Is there a machine-readable version of this comparison?

Yes. The markdown twin at [this comparison](/compare/re-align-just-eval-vs-rungalileo-hallucination-index.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.

### Which is better maintained, just-eval or hallucination-index?

just-eval: Dormant. hallucination-index: Dormant. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.

### Where are the full trust reports for just-eval and hallucination-index?

GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [just-eval trust report](/tools/re-align-just-eval/trust); [hallucination-index trust report](/tools/rungalileo-hallucination-index/trust).

---

**Machine-readable endpoints**

- JSON: [`/api/graphcanon/graph?tool=re-align-just-eval`](/api/graphcanon/graph?tool=re-align-just-eval)
- LLM index: [/llms.txt](/llms.txt)
- Full corpus: [/llms-full.txt](/llms-full.txt)

_GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_