Guides

Explainers and status trackers for the fast-moving parts of AI video — APIs that have not shipped yet, free tiers worth knowing about, and the questions everyone asks after a launch.

Kling 4.0 API: what we know

Kling's own developer API hasn't shipped yet — what's confirmed, what's reported, and what to watch for.

Updated 2026-10-20

Free AI video generators with sound, no sign-up

How free no-signup video tools with native audio work, what to realistically expect, and how to pick one.

Updated 2026-10-20

Want the head-to-head version?

Guides explain one topic. Comparisons put two models in the ring.

See all comparisons