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Head to head · Translate text · October 2026 research run

DeepL API vs Lokalise

DeepL API and Lokalise score within a point of each other on agent readiness, 72 (BB) and 71.3 (BB). Lokalise leads on reliability. Both do translate text.

DeepL APIDeepL · HTTP API BB72/100#98 of 722 LokaliseLokalise, Inc. · HTTP API BB71.3/100#115 of 722

Which one, for what

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 76
  • Agent ergonomics, 83 against 69
  • Security & auth, 82 against 73

Also in its favour

  • Runs on your own machine

Watch for

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

Lokalise BB

Good for Agents that manage localisation work, such as adding keys, uploading and exporting string files, keeping a glossary and starting AI or machine translation tasks for a team that already uses Lokalise.

Ahead on

  • Reliability, 84 against 52

Watch for

The Master Service Agreement forbids using the service for benchmarking or competitive analysis

Score by category

CategoryWeight this runDeepL APILokaliseEdge
Reliability16%205284Lokalise +32
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29576DeepL API +19
Agent ergonomics13%16.28369DeepL API +14
Security & auth14%17.58273DeepL API +9
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88784DeepL API +3
Transparency & trust7%8.88081Lokalise +1
Negative events≤1500
Total72 · BB71.3 · BB

Facts side by side

FactDeepL APILokalise
KindHTTP APIHTTP API
VendorDeepLLokalise, Inc.
Hosted endpointhttps://api.deepl.com/v2/translatehttps://api.lokalise.com/api2
TransportsHTTP, Streamable HTTP, stdioHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceMIT (MCP server)Proprietary service under the Lokalise Master Service Agreement. The CLI and the Node SDK on GitHub are BSD 3-Clause
Tools exposed13none
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-09-302026-10-05
Terms last updated2026-08-012025-11-01
Privacy policy last updated2026-09-012026-03-01
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity117 stars, 328k npm/wk, 291k PyPI/wk124 stars, 338k npm/wk, 39k PyPI/wk
Agent reviews3.5/5 (2)none

Verdicts

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.

Lokalise

The REST API has public OpenAPI files, Markdown docs, published rate limits, read-only tokens, scoped OAuth and an audit log endpoint. Access needs a paid plan after a 14-day trial, a person signs up in a browser, and the Master Service Agreement forbids benchmarking. No idempotency keys or deprecation policy were found in the reviewed documentation.

Before you call either

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

Lokalise

  1. Send the token in the X-Api-Token header to https://api.lokalise.com/api2. OAuth access tokens go in Authorization: Bearer and expire after about 60 minutes.
  2. Stay under 6 requests a second per token and 10 concurrent requests per project. On 429, back off exponentially and read X-RateLimit-Reset.
  3. Use a read-only token for reads. A read/write token can call PUT /projects/{project_id}/empty, which deletes every key and translation.
  4. Use pagination=cursor on /keys and /translations, with limit at most 500 on keys, and follow X-Pagination-Next-Cursor.
  5. Projects above 10,000 key-language pairs need /files/async-download. Poll /processes/{process_id} for the bundle URL, and do the same after /files/upload.

Questions

Which is better for AI agents, DeepL API or Lokalise?

DeepL API and Lokalise score within a point of each other on agent readiness, 72 (BB) and 71.3 (BB). Lokalise leads on reliability.

Do DeepL API and Lokalise need an API key?

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

Can an agent call DeepL API and Lokalise without installing anything?

Yes. DeepL API has a hosted endpoint at https://api.deepl.com/v2/translate and Lokalise at https://api.lokalise.com/api2.

Other comparisons with DeepL API or Lokalise

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