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Comparison · Infra & APIs
Nebula vs Retool
A side-by-side editorial comparison of Nebula and Retool — release velocity, themes, recent moves, and the top alternatives to consider.
Nebula vs Retool: at a glance
What is Nebula?
Nebula 1.12 adds optional offloading for throughput after a run of platform fixes.
Nebula is a peer-to-peer mesh VPN with its own certificate authority. Since v1.10.0 added IPv6 and multiple overlay addresses, releases have dealt with the fallout: v1.11.1 fixed an IPv6 firewall bypass, and v1.11.2 in September fixed IPv6 MTU on Windows, local address discovery on Android 11+, and checksums for traffic to a host's own IPv6 address on macOS. v1.12.0 on October 29 added optional UDP and TUN offloading, planned to become the default later, and stricter firewall rule parsing.
What is Retool?
Retool's app builder hits GA, generating React apps, with spend controls beside it.
Retool's app builder is generally available: it builds React apps from natural language, from MCP-compatible coding agents or from imported React code. On the same day Retool shipped limits on AI credit and token usage by user, group and model, along with credit packs by card on all paid plans. Private npm registries for Enterprise apps and GPT 6.1 Terra followed, while self-hosted stable channels took three more 4.34 updates.
Nebula vs Retool: editorial side-by-side
Nebula
2.5INFRA · APIS
Nebula 1.12 adds optional offloading for throughput after a run of platform fixes.
◆ Current state
Nebula is a peer-to-peer mesh VPN with its own certificate authority. Since v1.10.0 added IPv6 and multiple overlay addresses, releases have dealt with the fallout: v1.11.1 fixed an IPv6 firewall bypass, and v1.11.2 in September fixed IPv6 MTU on Windows, local address discovery on Android 11+, and checksums for traffic to a host's own IPv6 address on macOS. v1.12.0 on October 29 added optional UDP and TUN offloading, planned to become the default later, and stricter firewall rule parsing.
◆ Where it's heading
The IPv6 work has moved from security fixes to per-platform correctness, and 1.12 turns to throughput. Offloading starting as opt-in, with a stated plan to make it default, sets up the next release cycle.
◆ Prediction
Expect 1.12.x patches for offloading edge cases, and a later release that turns offloading on by default as announced.
Retool
6.3INFRA · APIS
Retool's app builder hits GA, generating React apps, with spend controls beside it.
◆ Current state
Retool's app builder is generally available: it builds React apps from natural language, from MCP-compatible coding agents or from imported React code. On the same day Retool shipped limits on AI credit and token usage by user, group and model, along with credit packs by card on all paid plans. Private npm registries for Enterprise apps and GPT 6.1 Terra followed, while self-hosted stable channels took three more 4.34 updates.
◆ Where it's heading
Retool is turning AI app generation into a metered product line: the builder is the surface, and credits and spend limits are how it gets sold and governed. Private npm registries point the same way, since generated React apps need a company's own packages. Self-hosted customers stay on a separate steady cadence of Edge builds and stable patches.
◆ Prediction
Expect more Enterprise controls around app builder output and the next frontier model added soon after launch. The entries don't show how AI credits are priced.
Alternatives to Nebula and Retool
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Nebula or Retool.
Skipper
Skipper now serves zone-filtered routes only when its own ingress is balanced across zones.
rsyslog
rsyslog keeps adding cloud outputs, with Kinesis in October after CloudWatch in August.
KubeVirt
KubeVirt 1.10 reaches beta with 1,345 changes from 94 contributors.
ToolJet
ToolJet's beta adds data source folders, database environments and git sync for workflows.
Apereo CAS
Apereo CAS 8.1.0 reaches a third release candidate with 8.0.0 still not final.
See all Nebula alternatives → · See all Retool alternatives →
Recent activity from Nebula and Retool
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoRetoolSelf-hosted Retool 4.34 and 4.0 stable updates
- 4d agoNebulaRelease v1.12.0
- 4d agoRetoolGPT 6.1 Terra available in Retool
- 4d agoRetoolSelf-hosted Retool 4.34 stable update
- 5d agoRetoolPrivate npm registries for apps
- 5d agoRetoolSpend controls for AI usage
- 5d agoRetoolBuy additional AI credits
- 1mo agoNebulav1.11.2 fixes IPv6 MTU on Windows and address discovery on Android
- 2mo agoNebulaIPv6 firewall bypass: unparsed protocols matched TCP/UDP rules
- 3mo agoNebulaBreaking: slog logging, corrected firewall reject/drop direction
- 8mo agoNebulaP256 signature malleability allowed blocklist bypass
- 9mo agoNebulaFix panic in use_system_route_table introduced by the previous release
Frequently asked questions
What is the difference between Nebula and Retool?
They serve adjacent needs but don't currently overlap on shipped themes. Retool is currently shipping more aggressively (velocity 6.3 vs 2.5), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Nebula better than Retool?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Retool is currently shipping more aggressively (velocity 6.3 vs 2.5), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to Nebula?
Top Nebula alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Nebula alternatives" section above for the current picks, or visit /alternatives/nebula-networking for the full list with editorial commentary on each.
What are the best alternatives to Retool?
Top Retool alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Retool alternatives" section above for the current picks, or visit /alternatives/retool for the full list with editorial commentary on each.