---
title: Citation Style Comparator - APA, IEEE & More | Scholar Sidekick
description: Compare citation styles side by side. Browse 10,000+ styles including APA, Vancouver, Chicago, and IEEE. Enter a DOI and see the difference. Free, no signup.
doc_version: "1.0"
last_updated: "2026-05-18"
---

# Citation Style Comparator

> HTML version: https://scholar-sidekick.com/tools/citation-style-comparator

Enter a DOI (or any supported identifier) and see the same paper formatted in any of 10,000+ CSL styles side by side. Useful for picking a style for a new journal submission, sanity-checking what a journal's house style produces, or comparing builtin styles against community CSL definitions.

## What this tool does

Resolves the identifier to canonical metadata once, then runs the metadata through the CSL engine for each style you select. Builtin styles (Vancouver, AMA, APA, IEEE, CSE) render through Scholar Sidekick's deterministic formatter; the other 10,000+ are fetched from the [CSL style registry](https://github.com/citation-style-language/styles) at request time.

## How to use

1. Open [the tool](https://scholar-sidekick.com/tools/citation-style-comparator).
2. Paste the identifier.
3. Pick the styles you want to compare. Toggle between them to see the structural differences (author-year vs numeric, et-al thresholds, journal abbreviation, italics on title vs container, etc.).

## Programmatic access

The same style-rendering surface is exposed via the [`POST /api/format`](https://scholar-sidekick.com/docs) endpoint - pass any `style` parameter from the CSL registry or one of the builtin slugs. The [scholar-sidekick MCP](https://scholar-sidekick.com/mcp) `formatCitation` tool accepts the same parameter.

## Related tools

- [DOI Lookup](https://scholar-sidekick.com/tools/doi-lookup) - the underlying metadata fetch that backs the formatter
- [DOI to BibTeX Converter](https://scholar-sidekick.com/tools/doi-to-bibtex) - structured-export sibling
- [DOI to RIS Converter](https://scholar-sidekick.com/tools/doi-to-ris) - reference-manager-import sibling
- [Free tools index](https://scholar-sidekick.com/tools) - all citation tools

## Sitemap

See the full [sitemap](https://scholar-sidekick.com/sitemap.md) for all pages.