All ViralNebula tools
15 AI tools for YouTube creators, grouped by the stage of the job they belong to. Each is a standalone web app — nothing to install, no browser extension.
How the suite fits together
A video fails at one of five points: the topic nobody wants, the script people stop watching, the thumbnail nobody clicks, the metadata that says nothing, or the post-mortem you never run. The order below — research → script → thumbnail → publish → diagnose — mirrors that, and each step's output is the next step's input. A title from the Idea Generator drops into the Script Writer; that script is what the Hook Optimizer and Voice Generator read.
Research comes first because it is the cheapest place to be wrong. Viral Hunter looks for outliers — uploads whose views run far ahead of their own channel's baseline, separating real topic demand from a big existing audience. Keyword Research says whether a new channel can realistically rank for the term, Competitor Spy shows how the channels already winning it package and schedule uploads, and Audience Voice reads comments back to you at scale.
Production is the Script Writer for the words (see our guide to writing scripts with AI), the Thumbnail Generator and Thumbnail Analyzer for the packaging (see the thumbnail size reference), and Script Safety to flag copyright and demonetisation risks before you record.
At publish time the YouTube SEO Optimizer writes the title, description and tags you paste into Studio — our breakdown of tags versus hashtags covers what still counts. Afterwards the Video Diagnostic drills into one failed video, the Channel Audit finds patterns across the channel, and the Video Asset Grabber pulls the thumbnail and tag data to study what beat you.
What each tool costs to run
Access depends on which of two credit pools a tool bills, not on how the menu groups it. The AI pool covers the generation tools and has a real free allowance: 300 credits per day and 900 per month, rising to 1,000 and 30,000 on a paid plan. The growth pool covers the research tools that call YouTube's Data API, and its free allowance is zero — paid-plan only. Credits are reserved before a run and refunded if it fails. Every card is labelled with its pool; full numbers are on the pricing page and in the FAQ.
Create — turning an idea into a finished video
All four bill the AI credit pool, so all four work on the free plan. Ordered the way you work: decide what the video is, write it, give it a face, give it a voice.
AI YouTube Idea Generator
Generate endless viral YouTube video ideas tailored to your niche and audience.
Free plan · 5 AI credits
AI YouTube Script Writer
Turn raw ideas into retention-hacked scripts with hooks, storytelling beats, and CTAs.
Free plan · 50 AI credits
AI YouTube Thumbnail Generator
Generate high-CTR YouTube thumbnails inspired by top creators in your niche.
Free plan · 30 AI credits
AI YouTube Voice Generator
Create ultra-realistic AI voiceovers for your YouTube videos, ads, and social content.
Free plan · AI credits
Growth — research before, diagnosis after
Research and analysis. Most read live data through YouTube's official public Data API and bill the growth pool, which is paid-plan only. Two exceptions, marked below: the Thumbnail Analyzer and Script Safety bill AI credits and work on the free plan.
YouTube SEO Optimizer
Rank higher on YouTube with AI-generated titles, tags, and descriptions tuned to your video.
Daily allowance
Viral YouTube Trend Hunter
Spot viral YouTube trends before they explode. Analyze rising topics and outliers across YouTube.
Paid plan · 10 growth credits
YouTube Competitor Spy Tool
Spy on your competitors' tags, keywords, upload schedules, and viral strategies.
Paid plan · 10 growth credits
YouTube Keyword Research Tool
Find low-competition, high-volume keywords for your niche.
Paid plan · 10 growth credits
YouTube Channel Audit
Get a comprehensive analysis of your channel's performance, weaknesses, and opportunities.
Paid plan · 10 growth credits
YouTube Video Diagnostic
Find out exactly why a single video is underperforming and what to fix — across packaging, discovery, CTR, hook, retention, and engagement.
Paid plan · 50 growth credits
YouTube Video Asset Grabber
Instantly download high-quality YouTube thumbnails and extract tags from any video.
Paid plan · 10 growth credits
YouTube Script Safety & Fact Checker
Check your YouTube scripts for copyright risks, sensitive topics, and factual errors before you record.
Free plan · 50 AI credits
YouTube Audience Voice Analyzer
Extract burning questions and content demands from your audience's YouTube comments.
Paid plan · 10 growth credits
AI YouTube Thumbnail Analyzer
Upload a thumbnail and get an instant CTR score, mobile squint-test, corner-by-corner fixes, and a one-click AI redesign.
Free plan · 10 AI credits
AI YouTube Hook Optimizer
Paste your script and get a retention score for your opening, drop-off-risk flags, and stronger hooks grounded in what your video delivers.
Paid plan · 10 growth credits
Coming from another tool
Most YouTube software measures and manages a channel you already publish to; this suite is built to produce the video. Weighing it against a subscription you already pay for? The vidIQ comparison and TubeBuddy comparison are honest about where the other tool is still the better pick; all comparisons sit together. New here? The how-to-use guide and the blog — starting with the overview of AI YouTube automation — are the fastest way in.
Frequently asked questions
Which ViralNebula tools can I use on the free plan?
The six that bill the AI credit pool: Idea Generator, Script Writer, Thumbnail Generator, Voice Generator, Thumbnail Analyzer and Script Safety. The free plan includes 300 AI credits per day and 900 per month. Growth-pool tools are paid-plan only, because the free growth allowance is zero.
What is the difference between AI credits and growth credits?
Two separate pools. AI credits power the generation tools — 5 for a batch of ideas, 50 for a script, 30 for a thumbnail — and the free plan includes 300 per day. Growth credits power the research tools that read YouTube's public Data API, and that pool exists only on the paid plan.
Which tool should I start with?
Start where you are stuck. No topic: the Idea Generator. No structure: the Script Writer. Impressions but no clicks: the Thumbnail Analyzer. Clicks but early drop-off: the Hook Optimizer. One failed video: the Video Diagnostic. A pattern across many: the Channel Audit.
Do I need to connect my YouTube account to use these tools?
No. Every tool works from a URL, a keyword or text you paste in. Research tools read public data through YouTube's official Data API, and where a tool needs numbers only you can see — the Video Diagnostic — you upload screenshots of your own YouTube Studio analytics instead.
What happens to my credits if a generation fails?
Credits are reserved before a request runs and refunded automatically if it fails, so an error never costs you anything.