# Crowdin vs DeepL API

> DeepL API scores 72 (BB) on agent readiness against Crowdin's 69.6 (B), and leads in 5 of 7 scored categories. Crowdin leads on reliability. Both do translate text. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api
- Markdown: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

DeepL API scores 72 (BB) on agent readiness against Crowdin's 69.6 (B), and leads in 5 of 7 scored categories. Crowdin leads on reliability. Both do translate text.

- Crowdin: grade B, 69.6/100, rank #153 of 722. Markdown https://www.anchorterminal.com/tools/crowdin.md · JSON https://www.anchorterminal.com/api/v1/tools/crowdin.json
- DeepL API: grade BB, 72/100, rank #98 of 722. Markdown https://www.anchorterminal.com/tools/deepl-api.md · JSON https://www.anchorterminal.com/api/v1/tools/deepl-api.json

## Which one, for what

### Crowdin (B)

Good for: Teams that keep product strings and files in Crowdin and want an agent to upload sources, check progress, apply pre-translation, manage glossaries and pull builds.

Ahead on:
- Reliability, 78 against 52

Watch for: The terms forbid accessing the service to monitor availability, performance or functionality, or for benchmarking, without Crowdin's prior written consent

### DeepL API (BB)

Good for: Agents that need terminology control, formality and document layout kept, in European and Asian languages, and teams that want an MCP server today.

Ahead on:
- Schema & documentation, 95 against 80
- Agent ergonomics, 83 against 69
- Security & auth, 82 against 68
- Maintenance & community, 87 against 82

Also in its favour:
- Agent-ready, a grade of BB or better
- Runs on your own machine
- Free to start without a card

Watch for: API Free and API Pro can't be bought any more, and API Developer's 1 million characters never reset


## Score by category

| Category | Weight | Crowdin | DeepL API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 78 | 52 | Crowdin +26 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 95 | DeepL API +15 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 83 | DeepL API +14 |
| Security & auth | 14% (17.5 this run) | 68 | 82 | DeepL API +14 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 87 | DeepL API +5 |
| Transparency & trust | 7% (8.8 this run) | 79 | 80 | DeepL API +1 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **69.6 · B** | **72 · BB** | |

## Facts side by side

| Fact | Crowdin | DeepL API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Crowdin OÜ | DeepL |
| Hosted endpoint | `https://api.crowdin.com/api/v2` | `https://api.deepl.com/v2/translate` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Crowdin's terms. The CLI and the official API clients are MIT | MIT (MCP server) |
| Tools exposed | none | 13 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-09-30 | 2026-09-30 |
| Terms last updated | 2026-09-24 | 2026-08-01 |
| Privacy policy last updated | 2026-09-24 | 2026-09-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 320 stars, 264k npm/wk, 14k PyPI/wk | 117 stars, 328k npm/wk, 291k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## Verdicts

**Crowdin.** The REST API has a public OpenAPI document with 374 operations, and tokens can be limited by scope, access level and project. Translation runs inside Crowdin projects and connected engines, so it is not a stateless per-character translation API. No Retry-After guidance, idempotency keys or SLA were found in the reviewed documentation.

**DeepL API.** Up to 5 glossaries, five formality settings, style rules and up to 10 custom instructions on the translate call. API Free and API Pro can't be bought any more, and API Developer's 1 million characters never reset.

## Before you call either

### Crowdin

1. Send `Authorization: Bearer <token>` to `https://api.crowdin.com/api/v2`. Crowdin Enterprise uses `https://<organization_domain>.api.crowdin.com/api/v2`
2. Use the MCP V2 endpoint `https://mcp.crowdin.com/v2/mcp` and set `crowdin-tool-sets`, because the server loads all 33 tool sets by default
3. Set `crowdin-read-only: true` on the MCP connection for exploration. It exposes only list and get tools
4. Keep to 20 concurrent requests an account across all tokens, and add your own backoff on 429
5. Upload a file to `/storages` first, then pass the `storageId` to the add-file call. Builds, exports and reports are asynchronous and need a status poll
6. `/mts/{mtId}/translations` takes at most 100 strings a call and needs the `mt` scope and a configured engine

### DeepL API

1. Match the host to the key. Keys ending `:fx` go to api-free.deepl.com, others to api.deepl.com
2. Send the key in the `Authorization: DeepL-Auth-Key` header, since query and body keys now get 403
3. Retry 429 and 529 with exponential backoff but stop on 456, which means the quota is spent
4. Set `tag_handling` to html for markup so the tags survive and aren't billed
5. Put a key-level usage limit on any key an agent holds, and scope it to the endpoints it needs

## Questions

### Which is better for AI agents, Crowdin or DeepL API?

DeepL API scores 72 (BB) on agent readiness against Crowdin's 69.6 (B), and leads in 5 of 7 scored categories. Crowdin leads on reliability.

### Do Crowdin and DeepL API need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Crowdin and DeepL API without installing anything?

Yes. Crowdin has a hosted endpoint at https://api.crowdin.com/api/v2 and DeepL API at https://api.deepl.com/v2/translate.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api.json, and with the fewest tokens: https://www.anchorterminal.com/compare/crowdin-vs-deepl-api.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "crowdin", "b": "deepl-api"}`. From a terminal: `anchor compare crowdin deepl-api`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/crowdin.json and https://www.anchorterminal.com/api/v1/tools/deepl-api.json

## Other comparisons with Crowdin or DeepL API

- [Amazon Translate vs Crowdin](https://www.anchorterminal.com/compare/amazon-translate-vs-crowdin.md)
- [Amazon Translate vs DeepL API](https://www.anchorterminal.com/compare/amazon-translate-vs-deepl-api.md)
- [Azure Translator vs Crowdin](https://www.anchorterminal.com/compare/azure-translator-vs-crowdin.md)
- [Azure Translator vs DeepL API](https://www.anchorterminal.com/compare/azure-translator-vs-deepl-api.md)
- [Crowdin vs Google Cloud Translation](https://www.anchorterminal.com/compare/crowdin-vs-google-cloud-translation.md)
- [Crowdin vs Lara Translate API](https://www.anchorterminal.com/compare/crowdin-vs-lara-translate.md)
- [Crowdin vs LibreTranslate](https://www.anchorterminal.com/compare/crowdin-vs-libretranslate.md)
- [Crowdin vs Lingo.dev](https://www.anchorterminal.com/compare/crowdin-vs-lingo-dev.md)
- [Crowdin vs Lingvanex Translation API](https://www.anchorterminal.com/compare/crowdin-vs-lingvanex.md)
- [Crowdin vs Lokalise](https://www.anchorterminal.com/compare/crowdin-vs-lokalise.md)
- [Crowdin vs Phrase](https://www.anchorterminal.com/compare/crowdin-vs-phrase.md)
- [Crowdin vs SYSTRAN Translate API](https://www.anchorterminal.com/compare/crowdin-vs-systran.md)
- [DeepL API vs Google Cloud Translation](https://www.anchorterminal.com/compare/deepl-api-vs-google-cloud-translation.md)
- [DeepL API vs Lara Translate API](https://www.anchorterminal.com/compare/deepl-api-vs-lara-translate.md)
- [DeepL API vs LibreTranslate](https://www.anchorterminal.com/compare/deepl-api-vs-libretranslate.md)
- [DeepL API vs Lingo.dev](https://www.anchorterminal.com/compare/deepl-api-vs-lingo-dev.md)
- [DeepL API vs Lingvanex Translation API](https://www.anchorterminal.com/compare/deepl-api-vs-lingvanex.md)
- [DeepL API vs Lokalise](https://www.anchorterminal.com/compare/deepl-api-vs-lokalise.md)
- [DeepL API vs Phrase](https://www.anchorterminal.com/compare/deepl-api-vs-phrase.md)
- [DeepL API vs SYSTRAN Translate API](https://www.anchorterminal.com/compare/deepl-api-vs-systran.md)