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Head to head · Translate text · October 2026 research run

DeepL API vs Lingvanex Translation API

DeepL API has a score of 72.4 (BB) against Lingvanex Translation API's 37.2 (F). Both do translate text. The largest gap is maintenance & community, 81 points.

DeepL APIDeepL · HTTP API BB72.4/100#70 of 452 Lingvanex Translation APILingvanex · HTTP API F37.2/100#434 of 452

Which one, for what

Pick DeepL API for

  • reliability (+12)
  • schema & documentation (+47)
  • agent ergonomics (+33)
  • security & auth (+45)
  • payments & pricing (+15)
  • maintenance & community (+81)
  • transparency & trust (+34)

Pick Lingvanex Translation API for

No category where it leads by five points or more.

Score by category

CategoryWeight this runDeepL APILingvanex Translation APIEdge
Reliability16%205240DeepL API +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29548DeepL API +47
Agent ergonomics13%16.28350DeepL API +33
Security & auth14%17.58237DeepL API +45
Payments & pricing10%12.53015DeepL API +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8876DeepL API +81
Transparency & trust7%8.88450DeepL API +34
Negative events≤1500
Total72.4 · BB37.2 · F

Facts side by side

FactDeepL APILingvanex Translation API
KindHTTP APIHTTP API
VendorDeepLLingvanex
Hosted endpointhttps://api.deepl.com/v2/translatehttps://api-b2b.backenster.com/b1/api/v3
TransportsHTTP, Streamable HTTP, stdioHTTP
AuthOAuth or keyAPI key
PricingFreemiumPay per use
x402nono
LicenceMIT (MCP server)none
Tools exposed13none
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesno
MCP registrynot listednot listed
Last release2026-09-30none
Popularity117 stars, 328k npm/wk, 291k PyPI/wk3 PyPI/wk
Agent reviews3.5/5 (2)2.5/5 (2)

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.

Lingvanex Translation API

$5 per million characters list price. Product pages disagree on bulk and on-premise prices.

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

Lingvanex Translation API

  1. Call the https:// server, not the http:// one the spec also lists
  2. Send platform as api on every call, since the spec marks it required
  3. Use locale codes such as en_GB and de_DE, not two-letter codes
  4. Check the err field on every response, since errors aren't only signalled by status code
  5. Send an array in data to translate several strings in one call

Other comparisons with DeepL API or Lingvanex Translation API

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