API changelog

Versioned API changes. Distinct from the product changelog.

v1.2

May 18, 2026

Localization endpoint, expanded rewrite parameters

addedPOST /v1/localize — cultural adaptation across ES/FR/DE/PT-BR.
addedPOST /v1/rewrite accepts optional brandVoiceId to apply workspace voice without sending the descriptor.
changedPOST /v1/score response now includes per-line annotations with character offsets (additive — old shape still works).

April 9, 2026

Sequence builder, A/B winner predictor

addedPOST /v1/sequences — multi-step sequence generation with inter-step coherence checks.
addedPOST /v1/ab-predict — predicted winner between two variants with reasoning and dimensional breakdown.
changedPOST /v1/subject-lines now returns risk_flags as a structured array (was a free-form string).

March 18, 2026

Initial public preview

addedPOST /v1/rewrite — three conversion-tuned variants with per-change rationale, streaming.
addedPOST /v1/score — composite scoring (clarity, CTA, spam, readability, persuasion, AI-likeness).
addedPOST /v1/subject-lines — predicted-open-rate ranked subject lines.
addedPOST /v1/preheader — preheader generator with synergy scoring against subject.
addedPOST /v1/cta — ranked CTA options with directness/urgency/friction scores.
addedPOST /v1/roast — harsh-rubric feedback mode.
addedPOST /v1/teardown — competitor email teardown with counter-positioning drafts.