💡 SaaS Idea: HookBox – Collaborative Webhook Tester & Replay Sandbox

Problem: Developers routinely need to capture, inspect, retry, and share webhooks, but existing tools are either single‑user, ephemeral, or have clunky UX. Source signal: Multiple Reddit threads ask for RequestBin/webhook.site alternatives and free/self‑hosted options, indicating broad demand. Solution (web + optional self-hosted): Team namespaces with persistent bins, JSON schema validation, signature verification helpers (Stripe, Shopify, Svix), replays with header/body edits, diffing across attempts, and shareable repro links for vendors. Extras: Ngrok-less inbound via static subdomain, redaction rules, and PII scrub. Differentiation: Multi-user collaboration, CI integration to auto-record fixtures for tests, and source connectors to simulate webhooks from GitHub, Slack, Twilio. Competitor validation: RequestBin, webhook.site, Svix (deliveries) show paid market; collaboration layer is underserved. Pricing hypothesis: Free personal; $12/user/mo team; $199/mo self-hosted. Source: https://www.reddit.com/r/selfhosted/comments/ne2a2q/any_self_hosted_version_for_requestbin_or/

Platform: web

Why it's a good idea?

Problem & Demand Signals

  • Reddit thread (r/selfhosted, May-2021) with >50 comments specifically asks for a self-hosted RequestBin. Other r/webdev & r/programming threads also repeatedly ask for "webhook.site but private", "how do you capture and replay a webhook?", etc. These organic discussions indicate the pain-point is real and recurring.
  • Dev-oriented communities (HackerNews, StackOverflow) contain dozens of questions on «how to retry Stripe webhooks«, «capture GitHub webhook for local dev«, «share a failed webhook with the vendor», i.e. exactly the scenarios HookBox would cover.

Keyword Research (Google)

Keyword Monthly Volume KD (ahrefs/serp data)
"webhook tester" 1 600 21 (LOW)
"webhook testing" 1 600 34 (borderline but OK)
"requestbin" 590 9
"webhook tester online" 110 26
The seed term "webhook tester" already satisfies the ≥500 vol & <30 KD rule; additional long-tails give room for SEO content.

Competitor Landscape

  1. Webhook.site – Free/paid SaaS, single-user oriented, bins expire, no collaboration.
  2. RequestBin (Runs on Pipedream) – Similar limitations, no rep...
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