Upstash QStash vs Synadia Cloud (NATS)
Agent-native side-by-side. Scores are curated estimates on a 0–10 scale. Lock-in: higher = worse. Prefer JTBD picks via /api/decide when choosing for a job.
| Dimension | Upstash QStash | Synadia Cloud (NATS) |
|---|---|---|
| Overall | 8.4 | 8.3 |
| Capability fit | 8.2 | 8.6 |
| Price / performance | 9.2 | 8.2 |
| Latency / reliability | 8.4 | 8.8 |
| Developer & agent DX | 9.2 | 8.0 |
| Privacy / data retention | 7.8 | 8.5 |
| Lock-in risk (higher = worse) | 3.5 | 3.8 |
| Maturity / track record | 8.0 | 8.5 |
| Pricing | As of 2026-09-14 (upstash.com/pricing/qstash): Free 1k messages/day, 50 GB, 1 MB max. PAYG $1 per 100k messages (unlimited/day, 10 MB, 1-year delay); bandwidth free to 50 GB then $0.05/GB. Fixed 1M $180/mo; Fixed 10M $42… | As of 2026-09-14 (docs.synadia.com/cloud/pricing): Personal free (2 accounts, 10 connections, 5 GiB, 10 GiB net). Starter $49/mo (3 accounts, 100 conn, 10 GiB std / 1 GiB HA). Pro $199/mo (10 accounts, 1k conn, 50 GiB st… |
| Tagline | Depot pick for a raw serverless agent event backbone (webhooks, delayed retries, fan-out) without operating… | Pick when agents need a real pub/sub fabric (multi-service, edge leafs) not just HTTP callbacks. QStash for… |
Upstash QStash
Depot pick for a raw serverless agent event backbone (webhooks, delayed retries, fan-out) without operating Kafka/SQS. Inngest when you need durable steps; NATS/Synadia when you need a real messaging fabric; WarpStream/Confluent when you already are Kafka. Strengths: Serverless HTTP queue/scheduler with almost no ops —
Strengths
- Serverless HTTP queue/scheduler with almost no ops — ideal agent callback bus
- Penny-level PAYG and a real free tier
- Works from Workers/Vercel/edge without a VPC
Weaknesses
- Not a workflow engine (no step state like Inngest/Temporal)
- Retries are billable
- SOC2 requires add-on until Enterprise
Synadia Cloud (NATS)
Pick when agents need a real pub/sub fabric (multi-service, edge leafs) not just HTTP callbacks. QStash for simpler serverless; Kafka/WarpStream for log-shaped replay. Strengths: NATS/JetStream fabric with subject-based routing — excellent agent command/event bus; Cheap Starter/Pro vs Kafka clouds; Leaf nodes for edge/
Strengths
- NATS/JetStream fabric with subject-based routing — excellent agent command/event bus
- Cheap Starter/Pro vs Kafka clouds
- Leaf nodes for edge/device agents
Weaknesses
- You still write consumer logic (not a workflow product)
- Personal plan drops connections on overage
- Smaller ecosystem than Kafka/SQS
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