Stop guessing which subscribers stay. Know with AI churn intelligence.
LetterLoop connects to your Substack, Beehiiv, or Ghost and surfaces retention signals your platform doesn't show.
$npm install letterloop-sdk Surface At-Risk Subscribers Before They Leave
LetterLoop analyzes open rates, reply frequency, and engagement cadence to flag churn risk weeks before it happens. Built for creators running $5K+ MRR.
- Weekly churn risk scores per subscriber
- Engagement decay alerts
- Configurable risk thresholds
```javascript
import { LetterLoopClient } from 'letterloop-sdk';
const client = new LetterLoopClient({ apiKey: process.env.LETTERLOOP_KEY });
const atRisk = await client.subscribers.findByRisk({
threshold: 'high',
since: '14d'
});
console.log(`Found ${atRisk.length} high-risk subscribers`);Track MRR Trends Your Dashboard Ignores
Aggregates recurring revenue, upgrades, downgrades, and cancellations across platforms. Syncs daily. Exports to CSV or via API for downstream tooling.
- MRR breakdown by tier and plan
- Cohort retention visualization
- Webhook support for real-time events
```python
import letterloop
client = letterloop.Client(api_key="ll_...")
metrics = client.metrics.mrr_history(
start_date="2024-01-01",
granularity="day"
)
for day in metrics:
print(f"{day['date']}: ${day['mrr']}")Automated Analysis Without a Data Team
GPT-4o-powered summaries of subscriber behavior patterns, content performance, and retention opportunities. Delivered weekly to your inbox or Slack.
- Weekly digest reports
- Trend anomaly detection
- Content-ENGAGEMENT correlation
Common Questions
Which newsletter platforms does LetterLoop support?
LetterLoop currently supports Substack, Beehiiv, and Ghost via official API integrations. Each integration provides read access to subscriber data, engagement metrics, and revenue information. OAuth-based connection keeps credentials on your behalf—no password sharing required.
How does LetterLoop calculate churn risk?
Churn risk is computed from a weighted model combining open rate decline (40%), reply frequency (25%), click-through rate (20%), and subscription tenure (15%). The model is tunable per creator; default thresholds are optimized for creators with 500+ paid subscribers.
Where is subscriber data processed and stored?
Data is processed in AWS us-east-1 with optional EU data residency (Frankfurt) for GDPR compliance. At-rest encryption uses AES-256. You can request data deletion at any time; complete wipe occurs within 72 hours per our data retention policy.
Is there an API for custom integrations?
Yes. The LetterLoop REST API exposes all dashboard data with OpenAPI 3.1 documentation. Available endpoints include /subscribers, /metrics, /churn-predictions, and /reports. Rate limits are 1000 req/min on Pro plans; enterprise tiers offer higher throughput and dedicated support.
What's the pricing model?
LetterLoop uses a per-creator pricing model: $29/month covers up to 1,000 paid subscribers. Growth plans scale to 10,000+ subscribers at $79/month. All plans include API access, weekly AI digests, and data exports. No per-seat fees for team members.
Can I export my data if I cancel?
Full data export is available at any time via the dashboard or API. Exports include subscriber lists, engagement history, revenue records, and AI-generated reports in JSON or CSV format. Download window remains open for 30 days after account closure.
Ship your retention intelligence in under a week
Join creators processing $15K+ MRR who stopped managing churn in spreadsheets.