Running an AI tool review site means I test 50+ new tools monthly. Most are wrappers around GPT-4 with a UI. Here's how I separate signal from noise in under 10 minutes per tool.

The 90% Filter (Eliminates Most Tools Instantly)

Before I even sign up, three questions:

1. Does it solve a problem I had before AI existed? If the "problem" only exists because AI created it (e.g., "manage your AI-generated content"), skip.
2. Can I describe the value without saying "AI-powered"? If removing "AI" from the description makes it meaningless, it's a feature not a product.
3. Would I pay for this if it weren't novel? Novelty wears off in a week. Utility doesn't.

This filter eliminates ~90% of new launches immediately.

The 10-Minute Deep Evaluation

For tools that pass the filter:

Minute 1-2: First-Use Experience

• Time to first value (TTFV): can I get output in under 60 seconds?
• Does it require my data/API keys to demo? (Red flag for privacy)
• Login friction: email-only signup or OAuth maze?

Minute 3-5: Core Functionality

• Run my standard test prompts (I keep a bank of 20 across categories)
• Compare output quality to the same prompt in raw Claude/GPT
• If output quality is indistinguishable → the tool adds no value over the API directly

Minute 6-8: Differentiation Check

• What does this do that I can't do with a well-crafted system prompt + API?
• Is the differentiation in UI/UX, output quality, or workflow integration?
• UI/UX differentiation is valid but must be significant (not just "dark mode ChatGPT")

Minute 9-10: Business Model Viability

• Free tier limitations: is it usable or a time-locked demo?
• Pricing relative to raw API costs (most tools are 10-50x markup on API costs)
• Team/enterprise angle: does this tool make sense for one person or only at scale?

What I've Learned After 600+ Tool Reviews

The Patterns That Predict Success

1. Workflow-native tools win — tools that live inside your existing workflow (VS Code extension, Slack bot, browser extension) beat standalone apps every time
2. Specific > general — "AI that writes SQL from natural language" beats "AI assistant for everything"
3. Output format matters more than output quality — a tool that gives me a perfect CSV is more valuable than one that gives me a slightly better answer as plain text
4. Batch processing is the killer feature — any tool that processes 100 items while I sleep is 10x more valuable than one that handles them one at a time

The Red Flags

• "Just like ChatGPT but..." — if your differentiator starts with "just like X," you don't have one
• Requires API keys to function — you're paying for a UI over an API you already have access to
• No export/API — your data is trapped; you'll hit a wall within a month
• Pricing per "credit" not per usage — designed to be confusing, always more expensive than it looks
• "Enterprise" with no team features — means "expensive" not "enterprise-ready"

The Categories That Actually Deliver Value

From highest to lowest ROI across 600+ reviews:

1. Code assistants (Cursor, Copilot, Claude Code) — measurable time savings, daily use
2. Writing/editing aids (Grammarly, Hemingway) — specific enough to be reliable
3. Data extraction/transformation — structured output from unstructured input
4. Image generation (for specific use cases, not general "make me art")
5. Meeting summarization — genuinely useful, hard to do manually at scale

Categories with the worst ROI:

• General chatbots (you already have one)
• AI social media managers (output is generic)
• AI "agents" that do everything (do nothing well)

The Review Site

I publish structured reviews with these evaluation scores at aidiscoverydigest.com. Every review includes: TTFV, differentiation score, pricing analysis, and a "would I still use this in 6 months" prediction.

If you're building an AI tool: the bar is higher than you think. Your competitor isn't other AI tools — it's a well-written system prompt in the user's existing API setup.