An AI video generator is a tool that creates video clips from a text prompt or an image, so you can make a shot without a camera, actors or a set. The best AI video generator for most people is Runway, because it pairs its own Gen-4.5 model with outside models, editing tools and upscaling in one workspace, from $12 a month.
The right pick depends on what you make and how much you want to spend. Kling AI is the best value, Google Flow has the most generous free credits, and Pika is the most fun for social clips. This guide compares five tools on pricing, free plans, credits and what each one does best.
How we chose these tools
We researched each tool’s official pricing page, help center and feature pages, plus user feedback on review sites and communities. We compared them on:
- Free plan or trial: what you can make without paying, and whether you can use it commercially.
- Real cost: the price on annual and monthly billing, and how many seconds of video the credits buy.
- Video quality and control: realism, motion, camera control and audio.
- Editing tools: whether you can extend, edit or upscale a clip after generating it.
- Commercial use and watermarks: which plans let you publish clean videos for clients.
What to look for in an AI video generator
A few limits matter far more than the demo reels suggest.
Credits per second, not credits per month. Every tool here runs on credits, and each model costs a set number per second of video. Runway’s Gen-4.5 costs 12 credits a second, so 625 credits buy about 52 seconds. Always work out the seconds you get, and remember failed attempts cost the same as good ones.
Clip length. These tools make short clips, usually 5 to 10 seconds. A 30-second ad is several clips edited together, so you’ll also need a video editor.
Commercial use and watermarks. Free plans usually add a watermark, and some don’t allow commercial use at all. On Kling, any paid plan allows commercial use; on Pika, Pro is the first plan without a watermark and with commercial use.
Audio. Some newer models, like Kling 3.0 and Google’s Veo, can generate sound with the video. It usually costs more credits, but saves a separate sound step.
Can AI make a whole video for me? Not in one click. AI video generators create short shots. You plan the shots, generate them, pick the best takes and edit them together into a finished video.
The best AI video generators at a glance
| Tool | Best for | Free plan | Paid plans from | Cappy Score |
|---|---|---|---|---|
| Runway (Cappy’s Pick) | Best overall, most creative control | 125 one-time credits | $12/month (annual) | 4.4/5 |
| Kling AI | Best value, realistic motion | Small daily allowance, watermarked | $6.60/month (annual) | 4.4/5 |
| Google Flow | Best free option, Google’s Veo models | 50 credits a day | $4.99/month (Google AI Plus) | 4.4/5 |
| Luma AI | Cinematic shots and AI agents | No, trial credits only | $25/month (annual) | 4.0/5 |
| Pika | Fun, quick social clips | 80 credits a month at 480p | $8/month (annual) | 4.0/5 |
1. Runway: best AI video generator overall
Runway generates video from text or images with its own Gen-4.5 model, and lets you edit, extend and upscale the results in the same workspace. Its Aleph model can also change footage you already have, such as the lighting, weather or objects in a scene.
Paid plans include outside models, such as Google’s Veo 3.1, with Kling 3.0 and Seedance added on Pro and Max. Pro and Max also include Unlimited Mode, which generates on supported models without spending credits, in a slower queue.
Key features: Gen-4.5 and Gen-4 Turbo models, Aleph video editing, outside models in one place, Unlimited Mode, 4K upscaling.
Best for: filmmakers, agencies and creators who want to direct every shot.
Where it falls short: Standard’s 625 credits buy only about 52 seconds of Gen-4.5 a month, and credits don’t roll over on Standard and Pro.
Pricing: Free 125 one-time credits; Standard $12, Pro $28, Max $76 a month (annual). Monthly billing costs $15, $35 and $95.
2. Kling AI: best value AI video generator
Kling AI, from Chinese tech company Kuaishou, is known for realistic people and natural movement. Kling 3.0 can generate sound with the video and render at 1080p or 4K. On paid plans, it makes up to four versions of a shot at once.
It’s also one of the cheapest paid plans in AI video. Annual Standard costs $6.60 a month for 660 credits, about 11 five-second 1080p clips with sound.
Key features: realistic motion, native audio, start and end frames, lip sync, web and mobile apps.
Best for: creators and marketers who want realistic clips on a budget.
Where it falls short: monthly prices rise after a discounted first month, free clips can’t be used commercially, and monthly credits expire after 31 days.
Pricing: Free daily credits; Standard $6.60, Pro $24.42, Premier $60.72 a month (annual). Monthly, Standard is $6.99 for the first month, then $8.80.
3. Google Flow: best free AI video generator
Google Flow is Google’s tool for making AI video with its own models, including Veo. You create clips from text or images and build them into scenes, and some models generate sound with the video.
Everyone gets 50 free credits a day, with no subscription needed, which makes Flow the easiest way to try high-quality AI video for free. Google AI plans, the same ones as the Gemini app, add monthly credits and access to more models.
Key features: Google’s Veo models, scene building, video with sound, upscaling, free daily credits.
Best for: anyone who wants to try top-quality AI video without paying, and Google AI subscribers.
Where it falls short: daily credits don’t build up, and some higher-quality models and longer clips need a paid Google AI plan. Google changes its model line-up often.
Pricing: Free 50 credits a day; Google AI Plus $4.99, Pro $19.99 and Ultra $99.99 a month.
4. Luma AI: best for cinematic shots and AI agents
Luma AI makes cinematic video models, including its Ray models, and combines them with Luma Agents, AI helpers that plan, generate, edit and refine a creative project with you. Plans also include selected outside image and video models, with commercial use.
Luma’s earlier app, Dream Machine, has evolved into Luma Agents, and new users start there. Many guides still describe Dream Machine’s old free and Lite plans, which new users can no longer get.
Key features: cinematic Ray models, Luma Agents, outside models, video editing, commercial use on every plan.
Best for: filmmakers and creative teams who want a polished, cinematic look and help planning projects.
Where it falls short: there’s no free plan, and the cheapest plan costs $25 a month on annual billing, the most expensive starting price here.
Pricing: Plus $25, Pro $75, Ultra $250 a month (annual). Monthly billing costs $30, $90 and $300.
5. Pika: best for fun, quick social clips
Pika is built for short, eye-catching clips rather than cinematic realism. Besides text and image to video, it’s known for creative effects that transform objects, swap elements and add surprising twists to a scene, which suits social media.
The free plan refills 80 credits every month, at 480p. Paid plans add more credits, higher resolutions and faster generation.
Key features: creative effects, text and image to video, keyframes, faster generation on paid plans.
Best for: social media creators who want playful, attention-grabbing clips.
Where it falls short: 80 free credits cover only a few low-resolution clips, and Pro is the first plan with commercial use and no watermark.
Pricing: Free 80 credits a month; Standard $8, Pro $28, Fancy $76 a month (annual). Monthly billing costs $10, $35 and $95.
Feature comparison
| Tool | Own models | Audio with video | Editing existing footage | Free plan catch |
|---|---|---|---|---|
| Runway | Gen-4.5, Gen-4 Turbo, Aleph | Yes, on supported models | Yes, with Aleph | 125 credits, one time |
| Kling AI | Kling 3.0 and earlier | Yes, on Kling 3.0 | Limited (extend, lip sync) | Watermarked, no commercial use |
| Google Flow | Veo | Yes, on supported models | Limited (scenes, upscaling) | Top models need a paid plan |
| Luma AI | Ray | Check the model | Yes, with Luma Agents | No free plan |
| Pika | Pika models | Check the model | Effects on existing clips | 480p only |
What each tool costs for one person for a year
Here’s the cheapest paid plan for each tool, on annual billing where it’s offered.
| Tool | Plan | Cost per year |
|---|---|---|
| Google Flow | Google AI Plus | $59.88 |
| Kling AI | Standard | $79.20 |
| Pika | Standard | $96 |
| Runway | Standard | $144 |
| Luma AI | Plus | $300 |
The cheapest plan isn’t always the cheapest video. Compare how many seconds each plan’s credits buy on the model you’d actually use, and leave room for failed attempts.
The best AI video generator for your type of work
Filmmakers and directors. You need control over each shot and a consistent look. Runway’s editing tools and multiple models fit best, with Luma AI as a strong option for cinematic style.
Social media creators. You post often and need clips that stop the scroll. Kling AI gives realistic clips cheaply, and Pika’s effects are made for playful social content.
Marketers and small businesses. You need product shots and short ads you can use commercially. Kling AI’s paid plans include commercial use from $6.60 a month; Runway Standard is the step up if you need editing.
Agencies. You make concept films and pitches for clients. Runway Pro or Max, or Luma AI Pro, give you the credits and tools for repeated client work.
Beginners and the curious. You want to see what AI video can do before paying. Start with Google Flow’s 50 free daily credits, then try Kling’s free allowance.
Which AI video generator should you choose?
- Best overall → Runway
- Best value → Kling AI
- Best free option → Google Flow
- Cinematic shots with AI agents → Luma AI
- Fun social clips → Pika
Read our full Runway review and Kling AI review, or browse all AI video generators. To edit your clips into a finished video, see our guide to the best AI video editors.
How to get started with an AI video generator
- Plan your shots. Write down each shot you need, its length and the camera move, before you generate anything.
- Start from an image. Image to video gives more predictable results than text alone, especially for people and products.
- Draft cheaply. Use a faster model or a lower resolution to test prompts, then generate the final take at full quality.
- Test on the free credits first. Try the same prompt in your top two tools and compare the results before you pay.
- Edit the clips together in a video editor, adding music, captions and titles.
Common mistakes to avoid
- Counting credits, not seconds. A big credit number can buy less than a minute of video on top models. Work out the seconds.
- Publishing free-plan clips commercially. Free clips are often watermarked and not licensed for business use. Check the plan before client work.
- Paying monthly for a year. Annual billing saves 20% to 25% on most of these tools.
- Forgetting the renewal price. Kling’s monthly plans start with a discounted first month. Check the price after that.
- Copying real people or brands. Avoid prompts that imitate real people, logos or copyrighted characters.
Frequently asked questions
What is the best AI video generator?
Runway is the best overall for most people, thanks to its Gen-4.5 model, editing tools and access to several outside models from $12 a month. Kling AI is the best value, and Google Flow is the best free option.
What is the best free AI video generator?
Google Flow, which gives everyone 50 free credits a day with no subscription. Kling AI also has a small daily free allowance, but free clips are watermarked and not for commercial use.
Which AI video generator is the cheapest?
Google Flow’s paid credits start with Google AI Plus at $4.99 a month. Among dedicated video tools, Kling AI Standard is the cheapest at $6.60 a month on annual billing.
Can I use AI-generated videos commercially?
Usually yes on paid plans. Kling allows commercial use on every paid plan, Pika from Pro, and Luma on every plan. Always check the current terms before client work.
How long can AI-generated videos be?
Most tools create clips of 5 to 10 seconds, and some let you extend a clip. Longer videos are made by editing several clips together.
Is Runway better than Kling?
Runway offers more editing tools and several models in one plan. Kling is cheaper and known for realistic motion. For most budget-conscious creators, Kling is better value; for creative control, Runway wins.