Product Discovery Startups

WhatNotSell The fact-checker for online deals: real discounts only, from 180+ stores

AppIndex Find the right AI tools for the right tasks

Builder Brief Turn Reddit, HN, and IH signals into evidence-backed product briefs

ToolListed List your tool, gain SEO backlinks, and reach high-intent users

MakerHunt Launch weekly, get real votes, and reach early adopters

Plug Your Build List your indie build in a permanent, searchable directory

Flyback Machine learning powered market intelligence for luxury watches

Jungkat Organizing product information for clearer comparisons

Kit.Club Skincare platform using structured data, AI, and community guidance

Only EU Find European alternatives to US software, products, and services

The AI Agent Index Search a structured, machine-readable directory of AI agents for business

Dishcount Turn local grocery deals into personalized meal plans

Mimir Search millions of materials science papers with accurate cited answers

Celavii Agentic creator intelligence from $49/mo with no contracts

BigIdeasDB Database Full of Validated Real-World Problems