Know what to build.
Daily opportunities for solo builders, with proof of demand.
Today's issue
11 opportunities
- Measured
- Estimated
- Security#1
Security header scanner for vibe-coded SaaS launches
Build an automated security header and email-auth scanner for indie SaaS founders — paste a URL, get a scored report on CSP, CORS, clickjacking, DMARC/SPF, security.txt and cross-origin isolation, with one-click fix snippets for the most common frameworks (Next.js, Vercel, Cloudflare). Sell it as a one-time scan plus a cheap monthly monitoring tier that re-checks after each deploy and alerts on regressions.
Demand7/10est.Buildability9/10est.Competition5/10est.via Reddit44 competitors - Sales#2
Bundled missed-call and review automation for local trades
Build a bundled lead-response SaaS for local service businesses (plumbers, HVAC, contractors, cleaners) combining missed-call text-back, instant quote follow-up automation, and same-day review request triggers, sold as an outcome (more booked jobs) rather than a website or SEO package. Target niche local-SEO agencies and freelance marketers as resellers, or sell direct to home-service owners via local directories and Facebook groups.
Demand6/10est.Buildability8/10est.Competition6/10est.via Reddit33 competitors - Developer tools#3
Paid de-AI-slop design fixer for vibe coders
Build a paid design-polish toolkit for vibe coders: a Claude/Cursor skill pack or lightweight SaaS that scans an AI-generated app's UI and rewrites it with a real design system (typography, spacing, color, component variants) so it stops looking like generic AI output. Sell it as a one-time skill pack on Gumroad or a small subscription for continuous design audits, targeted at solo builders shipping apps made with Claude Code, v0, Bolt, or Lovable.
Demand9/10measuredBuildability9/10est.Competition8/10est.via GitHub11 competitor - Legal & compliance#4
Cheap evidence-collection tool for DIY SOC 2
Build a lightweight, developer-friendly SOC 2 evidence-collection toolkit for small teams that cannot justify Vanta, Drata or Scytale pricing. It should connect to AWS, GCP, GitHub, Google Workspace and Okta via API, auto-pull and timestamp evidence on a schedule, and package it into an auditor-ready export, replacing the manual Notion or spreadsheet workflow.
Demand6/10est.Buildability7/10est.Competition6/10est.via Reddit33 competitors - AI agents#5
Verification layer so AI agents can prove 'done'
Build a verification and audit layer for AI agents that make changes to live systems (websites, CMSs, codebases, databases): after every write action, it re-reads the live state, diffs it against the intended change, and only then lets the agent report done. Sell it as a drop-in SDK or middleware to teams building agentic automation (marketing agents, DevOps agents, RPA bots) who need trustworthy completion signals and an approval gate before anything goes live.
Demand5/10est.Buildability7/10est.Competition10/10est.via Reddit0No named competitors - Developer tools#6
Per-customer LLM spend caps for micro-SaaS builders
Build a lightweight spend-guardrail proxy for solo AI micro-SaaS builders: a drop-in layer between their app and OpenAI/Anthropic that tracks per-customer token spend, enforces hard caps or auto-throttles runaway accounts, and sends Slack or email alerts before a bug or heavy user blows past their margin. Sell it as a usage-based add-on priced per monitored account or per API call.
Demand5/10est.Buildability7/10est.Competition5/10est.via Reddit44 competitors - Security#7
Obfuscation tools to blind AI reverse-engineering agents
Build and sell a code-protection toolkit (CLI, SDK, or MCP plugin) specifically designed to defeat AI-driven reverse-engineering agents, using decoy logic, prompt poisoning and context-exhaustion tricks to make automated code analysis fail or hallucinate. Target software vendors shipping Electron apps, JS bundles, Python packages and WebAssembly binaries who want to stop AI agents from extracting or cloning their proprietary business logic.
Demand9/10measuredBuildability5/10est.Competition5/10est.via GitHub44 competitors - Data & analytics#8
Independent outage monitor for prediction markets
Build a third-party status and incident monitoring tool for prediction markets (Polymarket, Kalshi, and similar) that tracks uptime, vendor/API outages, and settlement anomalies, alerting traders in real time via Telegram or Discord. Target active traders who need independent verification that a halt or vendor compromise isn't affecting their open positions, since the platform's own status page is not trusted during an incident.
Demand6/10measuredBuildability7/10est.Competition10/10est.via Hacker News0No named competitors - Security#9
Affordable wallet screening for DPRK-linked crypto theft
Build a lightweight wallet and address risk-screening tool for small exchanges, DeFi protocols, and retail crypto users who cannot afford enterprise platforms like Chainalysis. Pull public data (OFAC SDN list, known Lazarus Group and DPRK-linked addresses, on-chain clustering heuristics) into a simple API, browser extension, or Telegram/Discord bot that flags risky transfers in real time. Target smaller crypto teams scrambling to add basic sanctions screening after this record hack puts regulators and users on edge.
Demand2/10measuredBuildability7/10est.Competition5/10est.via Hacker News44 competitors - AI agents#10
Hosted no-code layer on cheap open-source browser agents
Package pre-built fastbrowse automations as a hosted micro-SaaS for non-technical users: a library of ready browser-agent tasks (price monitoring, form filling, lead scraping, QA testing of web flows) with a dashboard, scheduling, and no-code task builder, charging a markup over the already-cheap LLM cost. Target solo marketers, agencies, and indie devs who want browser automation without running CLIs or managing API keys.
Demand1/10measuredBuildability7/10est.Competition7/10est.via Hacker News22 competitors - Data & analytics#11
Searchable archive tool for pending Epstein document release
Build a searchable, OCR'd archive and research tool for the Epstein case files that this bill would force the DOJ to release: full-text search, entity/name extraction, cross-document timeline, and alerting for new batches as they drop. Target journalists, OSINT researchers, and the large true-crime/politics audience that drives huge traffic whenever new tranches surface.
Demand4/10measuredBuildability8/10est.Competition8/10est.via Hacker News11 competitor