# AceTagGen vs Onyx — Fit & Features

Canonical: https://trutool.co/compare/acetaggen-vs-onyx
Author: Snehil (https://trutool.co/authors/snehil)

Compare AceTagGen and Onyx by use case, features, limitations, and evaluation questions.

## Compare fit, features, and limitations

### AceTagGen
Free prompt system for SUNO AI. Structured 12-step Tag Builder, 3,200+ verified tags, 100-point Prompt Scorer, and a rich research blog with deep-dive articles, guides, tips and power tricks. All free, no signup.
Best fit: People and teams evaluating ai search & research for a specific workflow.
- Core product workflow
Before you choose: Test a representative task, inspect outputs, and confirm integrations, permissions, data handling, licensing, and current costs.
Pricing: https://acetaggen.com
- [Read AceTagGen profile](https://trutool.co/tools/acetaggen): Read AceTagGen profile

### Onyx
Search connected workplace knowledge with an open-source AI assistant.
Best fit: Researchers looking for answers grounded in relevant source material.
- Workplace search
- Knowledge connectors
- AI assistant
Before you choose: Read original sources and verify citations, freshness, and applicability. Professional judgments still need qualified review.
Pricing: https://onyx.app/pricing
- [Read Onyx profile](https://trutool.co/tools/onyx): Read Onyx profile