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Most "best AI tools" lists online are affiliate farms. We test tools on real dev workflows — shipping features, debugging production issues, cutting invoice generation time — and write down what actually worked.
Reviews below are grouped by use case. Every review names the version tested, the stack it was tested in, and what the tool could not do. If you see a tool missing, it either failed testing or we have not finished reviewing it yet.
Google shipped Gemini 3.8 Flash on 2 September 2026, its third Flash in six weeks. Same $0.75 / $3.75 price as 3.7 Flash through December, doubling on 1 January 2027. It jumps from 81.6% to 90.8% on Terminal-Bench 2.1 and edges GPT-5.6 Terra — by thinking harder, which costs output tokens. Here is the decision table, plus the Fairwind-gated Cyber variant.
For a buyer in India, the AI prompt marketplace question is really a payment question. Most big prompt stores price in USD and take only international cards — no UPI, plus an FX markup. Here is how PromptBase, Gumroad, Etsy, PromptHero and WOWHOW actually compare on currency, checkout, and whether you pay once or subscribe.
Garry Tan's gstack is the most-starred Claude Code configuration on GitHub, and it earns it. But it's an engineering stack by design — and if you run a business on Claude Code, engineering is only half the job. A field comparison from an operator, not a spectator.
Three frontier models compete for production workloads in June 2026. Claude Opus 4.8 leads on coding (88.6% SWE-Bench), Gemini 3.5 Pro owns ultra-long context (2M tokens), and GPT-5.6 targets agentic tasks. Here's the decision framework.