Runway vs Kling: Which AI Video Generator Is Cheaper?

Side by side: what Runway and Kling give you for free, what they charge to start, and whether they stamp a watermark. Sisif sits in the third column at $1 a clip.

Runway starts at $12/mo and Kling at $5.99-7.99/mo. On the free tier, Runway watermarks free exports and Kling watermarks free exports. Both are closed models you rent by the credit. Sisif runs an open-weights video model, charges $1 a clip, and never adds a watermark.

A short prompt is one 5 s clip at $1. A timeline is a story, $1 per 5 s, priced before you pay.

Compare

$1 a clipNo watermarkNo subscriptionCredits never expire

Sisif · terms
sisif.ai · rendered on our own GPUs
Watermarknone, ever
Credit expirynever
Failed rendercredits returned
Commercial useincluded
Subscriptionnone required
Modelopen weights, our GPUs
Agentspay per clip over the API
1 × clip, 5 s, 540x960$1
Total$1
Same terms on clips, and on every monthly plan.

Runway vs Kling vs Sisif

Feature Runway Kling Sisif
Free tier 125 one-time credits (no refresh) ~66 credits/day (~6 clips) None. $1 a clip, bought one at a time
Watermark on free output Yes Yes None
Entry paid plan $12/mo $5.99-7.99/mo $10/month (100 credits)
Cost per second $0.25-0.50 ~$0.09 2.5 to 6 credits per second
Model weights Closed Closed Open weights

Verdict

Kling is cheaper to start ($5.99-7.99/mo against $12/mo) and refreshes free credits daily, about six clips a day. Runway gives 125 credits once. Both watermark free exports. Sisif gives no credits away at all: a clip is $1, paid once, with no watermark on any export.

How it works

01

Describe the clip

Write what should happen in 5 seconds: the subject, the style, the camera move. The prompt stays attached to the render, so you can see what made each clip.

02

We render it

An open-weights model on GPUs we operate turns the prompt into a 540x960 portrait clip, most of the time in 2-5 minutes. A failed render returns the credits.

03

Download and publish

One MP4, no watermark, yours to publish anywhere, commercial use included. Pay $1 for the clip; nothing recurring.

Frequently asked questions

Which is cheaper, Runway or Kling?

Runway's entry plan is $12/mo and Kling's is $5.99-7.99/mo, both monthly. Sisif sells clips one at a time instead: $1 a clip, no subscription, with monthly plans from $10/month.

Do Runway and Kling watermark free videos?

Runway watermarks free exports. Kling watermarks free exports. Sisif never adds a watermark, on any plan.

Is there a cheaper alternative to Runway and Kling?

Sisif runs an open-weights video model and charges per clip: $1 per clip, with no subscription. Describe the clip, render it in portrait, download an MP4 with no watermark.

Explore more

Recent renders, with the prompt that made each one 5 s · 540x960 portrait
01you are dreaming. You wander an endless library whose shelves float in star-speckled darkness. Every book hums softly; opening one projects holograms of forgotten childhood memories. A paper moon drifts between aisles, guiding you toward a blank tome titled “Tomorrow.”
02“Bridal Bubbles at Dawn” – The bride, still in her delicate lace cover-up, the sunrise casting a blush glow over the scene.
03“Champagne Sandbar Soirée” – Three girlfriends clink flutes on a hidden sandbar; one splashes sparkling water at the camera while the others strike carefree, swimsuit-model poses.
04“Cabana brunch playlist” – Fresh fruit platters, draped white curtains fluttering, Bluetooth speaker playing mellow R&B, and toes idly tracing patterns in the sand.
05A barefoot couple wrapped in a linen sheet, standing on a balcony overlooking turquoise waves at sunrise
06Sorrento Coast, drone shot, travel, holiday video, sunny day

Ready to try the no-watermark one?

Every clip is $1. No watermark, no subscription, and the credits you buy never expire.

Render a clip See pricing