grammarly-cost-tuning

Grammarly Cost Tuning

Overview

Grammarly enterprise pricing is per-seat with API costs driven by text check request volume and document length. Each grammar check, tone analysis, and plagiarism scan consumes API quota proportional to word count. For organizations processing thousands of documents daily, unchecked API usage — especially on long documents or duplicate content — creates substantial cost overrun. Implementing validation gates, result caching, and sample-based scoring reduces API spend by 40-60% without sacrificing quality coverage.

Cost Breakdown

Component	Cost Driver	Optimization
Seat licenses	Per-user/month enterprise pricing	Audit active seats quarterly; remove inactive users
Text check requests	Per-call API quota on grammar/tone checks	Cache results for identical text; deduplicate requests
Document length	API cost scales with word count per request	Chunk documents over 10K words; skip boilerplate sections
Plagiarism scans	Higher-cost endpoint for originality checks	Run only on final drafts, not every revision
AI rewrite suggestions	Premium feature with per-request cost	Batch rewrites; limit to flagged passages only

API Call Reduction

class GrammarlyCostGate {
  private resultCache = new Map<string, any>();

  shouldCheck(text: string): boolean {
    const words = text.split(/\s+/).length;
    return words >= 30 && words <= 50_000; // Skip too-short; chunk too-long
  }

  async checkWithCache(text: string, checkFn: (t: string) => Promise<any>): Promise<any> {
    const hash = this.hashText(text);
    if (this.resultCache.has(hash)) return this.resultCache.get(hash);
    const result = await checkFn(text);
    this.resultCache.set(hash, result);
    return result;
  }

  sampleDocuments(documents: string[], rate = 0.2): string[] {
    // For bulk content audits, score a representative sample
    return documents.filter(() => Math.random() < rate);
  }

  private hashText(text: string): string {
    return text.slice(0, 200) + '|' + text.length;
  }
}

Usage Monitoring

class GrammarlyUsageMonitor {
  private daily = { score: 0, ai: 0, plagiarism: 0 };
  private budgets = { score: 5000, ai: 1000, plagiarism: 200 };

  record(type: 'score' | 'ai' | 'plagiarism'): void {
    this.daily[type]++;
    const utilization = (this.daily[type] / this.budgets[type]) * 100;
    if (utilization > 80) {
      console.warn(`Grammarly ${type} budget ${utilization.toFixed(0)}% used: ${this.daily[type]}/${this.budgets[type]}`);
    }
  }

  getReport(): Record<string, { used: number; budget: number }> {
    return Object.fromEntries(
      Object.keys(this.daily).map(k => [k, {
        used: this.daily[k as keyof typeof this.daily],
        budget: this.budgets[k as keyof typeof this.budgets]
      }])
    );
  }
}

Cost Optimization Checklist

• Cache grammar check results for identical text
• Validate text length before sending (30-50K word range)
• Use sample-based scoring for bulk content audits (20% sample)
• Run plagiarism checks only on final drafts
• Chunk documents over 10K words into smaller segments
• Skip boilerplate sections (headers, footers, legal text)
• Limit AI rewrite suggestions to flagged passages only
• Set per-endpoint daily budget alerts at 80% threshold

Error Handling

Issue	Cause	Fix
API quota exhausted mid-day	No usage monitoring or budget gates	Implement daily budget tracking with early warning
Duplicate checks on same content	No result caching	Hash-based cache for identical text submissions
Timeout on large documents	Single 50K+ word submission	Chunk into 10K-word segments and process sequentially
Plagiarism costs spiking	Running originality check on every save	Restrict to final draft submissions only
Stale cache returning outdated scores	Algorithm updates not reflected	TTL of 7 days on cached results; invalidate on version change

Resources

• Grammarly Enterprise
• Grammarly Developer API

Next Steps

See grammarly-performance-tuning.