Most Reddit monitoring tools tell you what's trending. Subredify tells you what's going to rank on Google. The Rank Opportunity Score is a 0-100 composite score calculated at the moment a thread is ingested — before any AI API calls, before you see the post. Here's exactly how it's computed and what each signal means.
The Six Rank Signals
The score is a weighted composite of six independent signals. Each signal is normalized to 0-100 before weighting. The final score reflects the probability that a given thread will appear in Google's top 10 results for at least one relevant query within 72 hours of posting.
- 01Subreddit Authority (25% weight) — Reddit's domain authority is shared, but individual subreddits have different effective authority based on subscriber count, engagement rate, and external link profiles. r/entrepreneur threads rank faster than r/sideproject threads — this signal captures that difference.
- 02Title Searchability (20% weight) — Question-format titles, superlative titles ('best X', 'X vs Y'), and titles that directly mirror commercial search queries score highest. A title that reads like a Google query is a title that will rank for that Google query.
- 03Comment Velocity (20% weight) — Comments per hour in the first 24 hours. High velocity signals authentic engagement to Google's crawler, which accelerates indexation. Threads with >10 comments/hour in the first day are flagged as crawl priority.
- 04Upvote Velocity (15% weight) — Upvotes per hour in the first 6 hours. Early upvote concentration predicts sustained engagement, which Google rewards. This signal decays quickly — a thread that accumulates 50 upvotes in hour one is scored differently than one that accumulates the same total over a week.
- 05Age Window (10% weight) — Threads posted 2-72 hours ago receive a 5% multiplier bonus. This is the window Google prioritizes for fresh content; outside this window, threads compete as established content (lower recency advantage).
- 06Existing SERP Presence (10% weight) — If a thread is already confirmed to appear in Google search results (checked via external search verification), it gets the maximum signal value. These threads have already proven their ranking potential — every reply gets guaranteed distribution.
Score Tiers and What They Mean
- ▪70-100: High — Thread is actively ranking or has strong signals for imminent ranking. Reply in the next 2-4 hours.
- ▪45-69: Medium — Thread may rank with continued engagement. Worth monitoring; reply if ICP match is strong.
- ▪0-44: Low — Thread unlikely to rank organically. Only worth engagement if ICP match is exceptional or you have specific off-platform reasons.
Why It's Computed at Ingest (Not Later)
The score is calculated the moment a thread is ingested — using pure CPU computation, no AI API calls. This approach has two advantages: it's instantaneous (scores appear alongside posts with no delay), and it's free to compute (scoring 10,000 posts costs zero API tokens).
The score is computed at ingest because the signals that matter most are early signals. By the time a thread is 6 hours old, its rank destiny is largely determined. Acting before the window closes is the entire point — and you need scores the moment threads appear, not after a processing delay.
Combined with ICP Scoring
The Rank Opportunity Score answers 'will Google show this thread?' The ICP Score (computed separately via Claude Haiku) answers 'is this thread relevant to your buyers?' Both are required for a thread to be worth your time. A thread that ranks on Google but isn't ICP-relevant is distribution without targeting. A thread that's ICP-relevant but won't rank is effort without reach.
The feed's 'High Google Rank' filter shows only threads with Rank Opportunity Score ≥ 70. The 'High Opportunity' badge appears when Rank ≥ 70 and ICP ≥ 60 — these are the threads where distribution and targeting converge.