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Head to head · Translate text · October 2026 research run

Lokalise vs SYSTRAN Translate API

Lokalise scores 71.3 (BB) on agent readiness against SYSTRAN Translate API's 40 (E), and leads in 6 of 7 scored categories. SYSTRAN Translate API leads on payments & pricing. Both do translate text.

LokaliseLokalise, Inc. · HTTP API BB71.3/100#115 of 722 SYSTRAN Translate APISYSTRAN (ChapsVision) · HTTP API E40/100#691 of 722

Which one, for what

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 25
  • Schema & documentation, 76 against 42
  • Agent ergonomics, 69 against 54
  • Security & auth, 73 against 55
  • Maintenance & community, 84 against 4
  • Transparency & trust, 81 against 51

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

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

SYSTRAN Translate API E

Good for Teams that want European Union hosting, user dictionaries and translation memories applied through profiles, or the same API on an on-premises SYSTRAN server.

Ahead on

  • Payments & pricing, 40 against 30

Watch for

The terms forbid benchmark tests and automated access that exceeds normal human volumes, which matters for any agent workload

Score by category

CategoryWeight this runLokaliseSYSTRAN Translate APIEdge
Reliability16%208425Lokalise +59
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27642Lokalise +34
Agent ergonomics13%16.26954Lokalise +15
Security & auth14%17.57355Lokalise +18
Payments & pricing10%12.53040SYSTRAN Translate API +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8844Lokalise +80
Transparency & trust7%8.88151Lokalise +30
Negative events≤1500
Total71.3 · BB40 · E

Facts side by side

FactLokaliseSYSTRAN Translate API
KindHTTP APIHTTP API
VendorLokalise, Inc.SYSTRAN (ChapsVision)
Hosted endpointhttps://api.lokalise.com/api2https://api-translate.systran.net
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingPaidPay per use
x402nono
LicenceProprietary service under the Lokalise Master Service Agreement. The CLI and the Node SDK on GitHub are BSD 3-ClauseProprietary service under the SYSTRAN Translate PRO terms and conditions
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-052023-06-16
Terms last updated2025-11-01no date given
Privacy policy last updated2026-03-01no document linked
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
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
Popularity124 stars, 338k npm/wk, 39k PyPI/wknone

Verdicts

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.

SYSTRAN Translate API

Five documented REST APIs cover text, files, dictionaries, translation memories and profiles, with a Google-compatible mode and a public price of €14.99 per million characters. The reference pages date from June 2023, and no changelog, status page, rate limit, SDK or downloadable OpenAPI file was found. The terms bar benchmark tests and automated use beyond human volumes.

Before you call either

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.

SYSTRAN Translate API

  1. Send the key as Authorization: Key <api_key> and avoid the documented ?key= query option, which puts the secret in URLs and logs
  2. Expect HTTP 400, not 401, when credentials are missing. The body reads No key / credentials provided
  3. Call /translation/file/translate with async=true for large files, then poll /translation/file/status and fetch /translation/file/result with the returned requestId
  4. Apply dictionaries and translation memories through a profile and pass its UUID as profile. withDictionary and withCorpus are deprecated
  5. Read the terms before automating. They bar benchmark tests and request volumes beyond normal human use, and SYSTRAN may throttle or suspend access

Questions

Which is better for AI agents, Lokalise or SYSTRAN Translate API?

Lokalise scores 71.3 (BB) on agent readiness against SYSTRAN Translate API's 40 (E), and leads in 6 of 7 scored categories. SYSTRAN Translate API leads on payments & pricing.

Do Lokalise and SYSTRAN Translate API need an API key?

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

Can an agent call Lokalise and SYSTRAN Translate API without installing anything?

Yes. Lokalise has a hosted endpoint at https://api.lokalise.com/api2 and SYSTRAN Translate API at https://api-translate.systran.net.

Other comparisons with Lokalise or SYSTRAN Translate API

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