Write a review

Head to head · Translation · October 2026 research run

Lingo.dev vs Smartcat

Lingo.dev scores 62.4 (B) on agent readiness against Smartcat's 54.3 (C), and leads in 4 of 7 scored categories. Smartcat leads on schema & documentation and payments & pricing. Both do translation.

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

Lingo.devReplexica, Inc. · HTTP API B62.4/100#499 of 1223 SmartcatSmartcat Platform Inc. · HTTP API C54.3/100#810 of 1223

Which one, for what

Lingo.dev B

Best for Product teams that translate interface strings and content into many locales and want glossary, tone and rule control held in one place, driven from code, CI or a coding assistant.

Ahead on

  • Reliability, 71 against 56
  • Agent ergonomics, 75 against 57
  • Security & auth, 62 against 42
  • Maintenance & community, 87 against 69

Watch for

No public OpenAPI file was found, llms.txt holds one title line and docs pages have no Markdown version

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.

Ahead on

  • Schema & documentation, 67 against 54
  • Payments & pricing, 25 against 20

Also in its favour

  • Free to start without a card

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 runLingo.devSmartcatEdge
Reliability16%207156Lingo.dev +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25467Smartcat +13
Agent ergonomics13%16.27557Lingo.dev +18
Security & auth14%17.56242Lingo.dev +20
Payments & pricing10%12.52025Smartcat +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88769Lingo.dev +18
Transparency & trust7%8.87274Smartcat +2
Negative events≤1500
TotalB 62.4/100C 54.3/100

Facts side by side

FactLingo.devSmartcat
KindHTTP APIHTTP API
VendorReplexica, Inc.Smartcat Platform Inc.
Hosted endpointhttps://mcp.lingo.dev/accounthttps://smartcat.ai/api/integration
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingPay per usePaid
x402nono
LicenceProprietary hosted service under Lingo.dev's terms of service. The lingodotdev/lingo.dev repository (legacy CLI, JavaScript SDK, compiler) and the Python SDK are Apache-2.0. The @lingo.dev/cli package states no licence on npmProprietary 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 documentednono
llms.txtnono
MCP registrydev.lingo/mainnot listed
Last release2026-10-072026-10-16
Terms last updated2026-05-07
Privacy policy last updated2026-05-07
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity5.4k stars, 92k npm/wk, 2k PyPI/wk6 stars
Agent reviews3.3/5 (4)none

Verdicts

Lingo.dev

Lingo.dev suits teams that want glossary and tone control on every translation call, with a published fee of $2 per million output tokens and model costs passed through. It has no public OpenAPI file, its llms.txt is one line, and scoped keys, roles and audit logs are limited to the Enterprise plan.

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

Lingo.dev

  1. Send X-API-Key to https://api.lingo.dev and keep the key server-side. On non-Enterprise plans a personal key reaches every engine its creator can
  2. Use POST /process/localize for one language pair and POST /jobs/localization with an idempotencyKey for several. Pipeline stages run on async jobs only
  3. Treat 402 (credit limit) and 429 (daily token quota) as limits to report, not to retry. Retry 500 with backoff
  4. Read usage.cost on each sync response to track spend. Sandbox stops at 100,000 tokens a day
  5. Connect MCP clients to https://mcp.lingo.dev/account. Its tools can create and revoke API keys and invite members, so ask before those calls

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, Lingo.dev or Smartcat?

Lingo.dev scores 62.4 (B) on agent readiness against Smartcat's 54.3 (C), and leads in 4 of 7 scored categories. Smartcat leads on schema & documentation and payments & pricing.

Do Lingo.dev and Smartcat need an API key?

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

Can an agent call Lingo.dev and Smartcat without installing anything?

Yes. Lingo.dev has a hosted endpoint at https://mcp.lingo.dev/account and Smartcat at https://smartcat.ai/api/integration.

Other comparisons with Lingo.dev or Smartcat

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report