Dragonfly Cloud vs Render Key Value: client limits and the next resize
Compare engine governance, client limits, and capacity changes before committing a growing application to Dragonfly Cloud or Render Key Value.
New Render Key Value instances run Valkey, with restart downtime when you upgrade capacity. Dragonfly Cloud runs its own company-controlled engine and offers horizontal scaling through Swarm, which requires cluster-aware clients. Choose Render if Valkey is central to your decision. For Dragonfly, weigh future licensing control and the cluster-mode choice you must make at creation.
At a glance
| Dimension | Dragonfly Cloud | Render Key Value |
|---|---|---|
| price (w/ 2 replicas) | from $24.00/GB-month | from $27/GB-month |
| availability | AWS, Google Cloud, Azure | Render cloud |
| engine + version | proprietary | Valkey 8 or Redis 6 |
| uptime SLA | 99.95% | unknown |
| support SLA | from 1 hour | unknown |
| autoscaling | autoscaling (business tier) | not supported |
| maximum size | 15 TB | 40 GB |
About Dragonfly Cloud
Dragonfly Cloud is a managed service built on the Dragonfly engine. Dragonfly is a separate implementation with a Redis-compatible API. The service offers standalone datastores and sharded Swarm deployments, with client requirements that depend on the selected mode.
About Render Key Value
Render Key Value is Render’s hosted key-value service. New instances run Valkey 8, while legacy instances run Redis 6. Customers select a provisioned instance size, which determines its memory and connection limits.
Recent updates
September 2, 2026 - Momento introduced Cluster and Flex capacity for Momento Cache. Both provide dedicated, managed Valkey resources. Cluster exposes topology choices, while Flex selects topology within capacity bounds, giving teams a choice in how they configure capacity while Momento operates the cluster.
June 11, 2026 - Render added configurable persistence for paid Key Value instances. Journal + Snapshot, Snapshot only, and Off give teams a choice based on the data they can regenerate. Mode changes restart the instance, and moving to or from Off loses all data, so include recovery behavior in planned capacity changes.
Choose the project you want to depend on
Render’s new instances run Valkey 8, making it the Valkey option in this pair. Prefer Valkey over Redis for its broad industry backing and continued advancement of the state of the art.
Dragonfly is a separate engine, not Redis or Valkey. DragonflyDB, Ltd. controls its licensing and can change the terms for future releases. That creates a dependency on one company’s decisions about the engine’s future. (Dragonfly license, maintainer discussion of version-specific terms)
Redis Inc.’s March 2024 licensing change provides a historical example of that risk. Momento’s RIP Redis article on the Garantia Data licensing heist explains the concern about company-controlled engine licensing.
Plan how capacity changes will affect the application
Dragonfly Swarm added managed horizontal scaling on February 19, 2025. Swarm requires cluster-aware clients, and cluster mode stays fixed for an existing datastore. Memory and compute can resize, and Business lists autoscaling.
Render upgrades restart the instance, causing about one to two minutes of unavailability. You cannot downgrade an existing instance in place. Data-loss consequences depend on persistence mode, so the application’s fallback and cache-warming needs belong in the resize plan. (Render capacity changes)
Connection limits can force that resize before memory fills. Render’s published compute plans allow 1,000 connections at 1 GB and reach 40,000 at 40 GB.
Try Momento Cache
If application replicas are multiplying while the dataset stays small, evaluate Momento for client scale and managed operations.
Momento Cache puts dedicated, high-performance Valkey behind a managed gateway that keeps client integration stable as your application grows. Choose Cluster for direct control over instance types, shards, and replicas, or Flex to set capacity and replication bounds while Momento selects the topology. Both include built-in autoscaling and fully managed cluster operations.
Talk to a Momento solution engineer to evaluate the capacity model and configuration that fit your workload.
Frequently asked questions
When is Render’s Off mode useful?
Use Off for disposable cache data that the application can regenerate. Moving to or from Off loses all data and restarts the instance.
What happens to older Render Redis instances?
Instances created before February 12, 2025 use Redis 6 and continue operating without feature-version upgrades. Render has documented security patch maintenance for both engines.
How should I size Dragonfly for sustained traffic?
Use baseline bandwidth for the chosen configuration. Dragonfly’s AWS Standard 12.5 GB example lists 0.5 Gbps baseline and 10 Gbps temporary, non-guaranteed burst. Those figures vary with cloud, memory, and compute tier.
What uptime and support commitments are published?
Dragonfly’s 99.95% SLA averages monthly shard availability. Its initial support response starts from 1 hour.
Render’s public terms do not establish a Key Value uptime percentage or numerical support response target.