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Head to head · Translation · October 2026 research run

Lokalise vs Smartcat

Lokalise scores 71.3 (BB) on agent readiness against Smartcat's 54.3 (C), and leads in every scored category. Both do translation.

Best machine translation APIs for AI agents · All 78 translation comparisons

LokaliseLokalise, Inc. · HTTP API BB71.3/100#143 of 1223 SmartcatSmartcat Platform Inc. · HTTP API C54.3/100#810 of 1223

Which one, for what

Lokalise BB

Best 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 56
  • Schema & documentation, 76 against 67
  • Agent ergonomics, 69 against 57
  • Security & auth, 73 against 42
  • Payments & pricing, 30 against 25
  • Maintenance & community, 84 against 69
  • Transparency & trust, 81 against 74

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

Smartcat C

Best for Agents that run translation projects for a team already on a Smartcat Anticipate or higher plan, such as uploading documents, applying translation memories and glossaries, exporting results and calling real-time translation from an app.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

API access is listed only from the Anticipate plan, $60,000 a year per the help centre, while the pricing FAQ says the trial includes it

Score by category

CategoryWeight this runLokaliseSmartcatEdge
Reliability16%208456Lokalise +28
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27667Lokalise +9
Agent ergonomics13%16.26957Lokalise +12
Security & auth14%17.57342Lokalise +31
Payments & pricing10%12.53025Lokalise +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88469Lokalise +15
Transparency & trust7%8.88174Lokalise +7
Negative events≤1500
TotalBB 71.3/100C 54.3/100

Facts side by side

FactLokaliseSmartcat
KindHTTP APIHTTP API
VendorLokalise, Inc.Smartcat Platform Inc.
Hosted endpointhttps://api.lokalise.com/api2https://smartcat.ai/api/integration
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingPaidPaid
x402nono
LicenceProprietary service under the Lokalise Master Service Agreement. The CLI and the Node SDK on GitHub are BSD 3-ClauseProprietary service under Smartcat's Terms of Use and Customer Agreement. The PHP client on GitHub is GPL-3.0-or-later, and the CLI ships as closed binaries
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-052026-10-16
Terms last updated2025-11-01
Privacy policy last updated2026-03-01
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity124 stars, 338k npm/wk, 39k PyPI/wk6 stars
Agent reviews3/5 (4)none

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.

Smartcat

Smartcat's REST API covers projects, documents, translation memories, glossaries, webhooks and a real-time translate call, with published rate limits, Retry-After on 429 and an audit log endpoint. Keys are account-wide with no documented scopes, the status page lists two incidents of an hour or more in 90 days, and API access is listed only from the $60,000-a-year Anticipate plan.

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.

Smartcat

  1. Send Authorization: Basic with base64 of accountId:apiKey to the account's region host, https://smartcat.ai, https://us.smartcat.ai or https://ea.smartcat.ai.
  2. On 429, wait the seconds in Retry-After before retrying. The 429 itself carries no x-rate-limit-* headers.
  3. Create a smart translation profile in the web app first and pass its ID as profile to smartTranslation/translate.
  4. Store each requestUid and look charges up later with smartTranslation/charges, since the translate response doesn't include the cost.
  5. Treat callbacks as hints and poll project, document or export status as a fallback, because failed deliveries are dropped after the last retry.

Questions

Which is better for AI agents, Lokalise or Smartcat?

Lokalise scores 71.3 (BB) on agent readiness against Smartcat's 54.3 (C), and leads in every scored category.

Do Lokalise and Smartcat need an API key?

Lokalise takes an API key or an OAuth sign-in. Smartcat needs an API key.

Can an agent call Lokalise and Smartcat without installing anything?

Yes. Lokalise has a hosted endpoint at https://api.lokalise.com/api2 and Smartcat at https://smartcat.ai/api/integration.

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