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ReplyGain replygain.com

Can AI replace ReplyGain?

A local Reddit keyword watcher with AI scoring and suggested replies is a weekend build. ReplyGain is more than that: it schedules ingestion across four platforms, normalizes and deduplicates posts, ranks purchase intent, sends alerts, generates replies, and keeps platform integrations working as APIs and feeds change. The core workflow is vibecodable, but a reliable multi-platform service has real maintenance and infrastructure gaps.

Verdict: Half-bot · AI gets you partway; the hard part stays hardBuild time: multi-day
Half-bot

01What it costs

$22/moStarter, monthly subscription
$264per year at that price

Checked Aug 12, 2026 · source: replygain.com. There is no ongoing free tier; a 7-day pass costs $9 one time and includes Starter access.

02Could AI build it for you?

The core job: Collect public posts from Reddit and Hacker News, match them against product keywords, score likely buying intent with an LLM, and show an editable suggested reply in a local dashboard.

What a working version needs:

  • Node.js and SQLite
  • Reddit and Hacker News public feeds or APIs
  • OpenAI-compatible API key

A founder-focused lead finder. The honest DIY version is a useful personal monitor, not a maintenance-free replacement for the hosted service.

03What you'd give up

  • Four monitored platforms in one service, including Bluesky and X
  • scheduled scans, deduplication, and long-term lead history
  • production alerts through email and Telegram
  • connector maintenance when a platform changes its API or feed
  • billing, quotas, account management, and multi-website support

The first script is easy. The useful version keeps scanning public conversations, removes duplicate and irrelevant posts, handles several platforms, remembers what has already been reviewed, and delivers the right lead at the right time. Founders pay to spend ten minutes reviewing opportunities instead of starting every day with two hours of manual searching.

05The build prompt

Paste this into an AI coding tool (such as Claude, ChatGPT, Lovable or Replit) to build your own version.

prompt.txt
Build a local, honest personal substitute for ReplyGain in an empty folder.

Stack: Node 22, TypeScript, Express, better-sqlite3, and vanilla HTML/CSS/JS. Do not use React or a hosted database.

Scope: Reddit and Hacker News only.

- Import recent public posts using Reddit JSON endpoints and the Hacker News Algolia API
- Let me enter a product description and keywords
- Store posts in SQLite with source, URL, title, text, author, score, and discoveredAt
- Use an OpenAI-compatible API from .env to classify purchase intent from 0 to 100
- Show a sortable local feed with intent score, source, matched keyword, and a link to the original post
- Generate an editable suggested reply for one selected lead
- Add seen, dismissed, and replied states; never post automatically
- Poll on demand only; no background worker, billing, login, Telegram, email, X, Bluesky, or multi-user features
- Include .env.example, README, seed data, and a smoke test that uses fixtures instead of live APIs
- Explain in README that APIs, rate limits, moderation rules, and platform changes make this a personal prototype
- Finish by listing the exact commands used to install, test, and run the app

06Open-source starting points

Sponsor slot · openFeatured alternative to ReplyGain. A labeled card for one relevant tool.
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App prices, verdicts, alternatives and build prompts are adapted from Can I Vibecode It? (MIT License, © 2026 Rob Hallam). Each price shows the date it was checked and its source. Prices change; confirm on the vendor's site before you decide.