# KairosDB vs QuestDB

**Leader by vioscaleAI score:** QuestDB

| Attribute | KairosDB | QuestDB |
|---|---|---|
| **vioscaleAI score** | 29.5 (55% (medium)) | 49.9 (70% (medium)) |
| activity.commits_last_30d | 0 | 38 |
| adoption.dependent_repos | 32 | 106 |
| adoption.github_stars | 1,761 | 17,444 |
| adoption.package_downloads_weekly | 3 | - |
| content.faq | `[{"answer":"Open-source time series database that leverages Cassandra for storage, providing REST and Graphite protocol support for data ingestion and retrieval, with built-in aggregation functions and extensible architecture via plugins. It is indexed under Time-Series Databases.","source":"https://kairosdb.github.io/","question":"What is KairosDB?","confidence":0.6},{"answer":"KairosDB is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://kairosdb.github.io/","question":"Is KairosDB free to use?","confidence":0.6},{"answer":"KairosDB supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://kairosdb.github.io/","question":"What platforms does KairosDB support?","confidence":0.6},{"answer":"Yes. KairosDB can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://kairosdb.github.io/","question":"Can KairosDB be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for KairosDB, including Cassandra, Graphite and Telnet. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://kairosdb.github.io/","question":"What does KairosDB integrate with?","confidence":0.6},{"answer":"Yes. KairosDB is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/kairosdb/kairosdb","question":"Is KairosDB open source?","confidence":0.67}]` | `[{"answer":"QuestDB is an open-source time-series database engineered for low latency, delivering ultra-low latency ingestion, high throughput, and multi-tier storage for demanding time-series workloads. It is indexed under Time-Series Databases.","source":"https://questdb.io","question":"What is QuestDB?","confidence":0.6},{"answer":"QuestDB offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","question":"Is QuestDB free?","confidence":0.6},{"answer":"QuestDB supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","question":"What platforms does QuestDB support?","confidence":0.6},{"answer":"Yes. QuestDB can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","question":"Can QuestDB be self-hosted?","confidence":0.6},{"answer":"We have confirmed 10 integrations for QuestDB, including PostgreSQL, Parquet, Arrow, Polars, Pandas, Debezium, Iceberg and MySQL, plus 2 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","question":"What does QuestDB integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 and GDPR for QuestDB. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as QuestDB not holding them. Always confirm compliance directly before you rely on it.","source":"https://questdb.io","question":"What security certifications does QuestDB have?","confidence":0.48},{"answer":"Yes. QuestDB is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/questdb/questdb","question":"Is QuestDB open source?","confidence":0.95},{"answer":"QuestDB is available worldwide. Its primary markets are the United Kingdom and the United States. The vendor is headquartered in the United Kingdom.","source":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","question":"Where is QuestDB available?","confidence":0.75}]` |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true,"hybrid":true,"self_hosted":true}` |
| description.long | KairosDB is a time series database built on Cassandra that supports multiple cluster architectures with separated read and write paths, allowing efficient data management across distributed systems. | A specialized database engineered to ingest high-volume time-series data at speed, execute queries with minimal latency, and maintain queryable history across tiered storage layers—combining standard SQL with open file formats for portability. |
| features.capabilities | `{"clustering":"distributed","data_model":"metrics","deployment":"self_hosted","downsampling":"continuous_aggregates","ingest_model":"push","licence_class":"source_available","retention_ttl":"manual","query_language":"REST API, Graphite protocol","replication_ha":true,"high_cardinality":"strong","sql_compatibility":"non_sql"}` | `{"clustering":"distributed","data_model":"events","deployment":"self_hosted","compression":"columnar with frame compression","downsampling":"continuous_aggregates","ingest_model":"push","licence_class":"permissive_oss","retention_ttl":"automatic","query_language":"SQL with time-series extensions (SAMPLE BY, ASOF, HORIZON JOIN, N-dimensional ar","replication_ha":true,"high_cardinality":"strong","sql_compatibility":"full_sql"}` |
| integrations.count | 3 | 7 |
| integrations.list | `[{"name":"Cassandra"},{"name":"Graphite"},{"name":"Telnet"}]` | `[{"name":"PostgreSQL"},{"name":"Parquet"},{"name":"Arrow"},{"name":"Polars"},{"name":"Pandas"},{"name":"Debezium"},{"name":"Iceberg"},{"name":"MySQL"},{"name":"MongoDB"},{"name":"Cassandra"},{"name":"Kafka","native":true,"direction":"inbound"},{"name":"Apache Parquet","native":true,"direction":"bidirectional"},{"name":"Apache Arrow","native":true,"direction":"bidirectional"},{"name":"Claude Code","native":true,"direction":"bidirectional"},{"name":"REST API","native":true,"direction":"bidirectional"},{"name":"Apache Iceberg","native":true},{"name":"Databricks","category":"data_platform"},{"name":"AWS","category":"cloud"},{"name":"Azure","category":"cloud"}]` |
| language.primary | Java | Java |
| license.spdx | Apache-2.0 | Apache-2.0 |
| market.availability | - | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"linux":true}` | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://kairosdb.github.io/","retrievedAt":"2026-08-13T23:03:34.808Z"}` | `{"type":"hybrid","summary":"Open-source Apache 2.0 free tier; QuestDB Cloud and Enterprise plans available via contact/quote","freeTier":true,"sourceUrl":"https://questdb.com/glossary/black-scholes-model-for-option-pricing/","retrievedAt":"2026-08-14T16:37:07.614Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | open_source | freemium |
| pricing.price_level | free | low |
| pricing.transparent | - | no |
| release.cadence_days | 92 | 16 |
| release.history | `[{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.3.0","date":"2021-08-09T04:31:37Z","type":"stable","version":"v1.3.0"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.2.2","date":"2018-11-10T04:04:05Z","type":"stable","version":"v1.2.2"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.3.0-beta1","date":"2018-04-14T04:43:02Z","type":"prerelease","version":"v1.3.0-beta1"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.2.1","date":"2018-03-31T19:07:29Z","type":"stable","version":"v1.2.1"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.2.0","date":"2018-02-01T14:54:51Z","type":"stable","version":"v1.2.0"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.1.3","date":"2017-01-04T00:24:16Z","type":"stable","version":"v1.1.3"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.1.2","date":"2016-09-08T04:29:39Z","type":"stable","version":"v1.1.2"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.1.1","date":"2015-12-08T03:09:45Z","type":"stable","version":"v1.1.1"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.1.0","date":"2015-11-05T23:22:46Z","type":"stable","version":"v1.1.0"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v1.0.0","date":"2015-06-05T05:08:49Z","type":"stable","version":"v1.0.0"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v0.9.5beta2","date":"2015-04-03T13:25:15Z","type":"prerelease","version":"v0.9.5beta2"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v0.9.5beta1","date":"2015-01-26T20:29:20Z","type":"prerelease","version":"v0.9.5beta1"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v0.9.4","date":"2014-07-07T21:30:43Z","type":"stable","version":"v0.9.4"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v0.9.3","date":"2014-06-18T16:10:41Z","type":"stable","version":"v0.9.3"},{"url":"https://github.com/kairosdb/kairosdb/releases/tag/v0.9.2","date":"2014-06-18T16:51:02Z","type":"stable","version":"v0.9.2"}]` | `[{"url":"https://github.com/questdb/questdb/releases/tag/10.0.1","date":"2026-08-24T13:55:02Z","type":"stable","version":"10.0.1"},{"url":"https://github.com/questdb/questdb/releases/tag/10.0.0","date":"2026-08-06T15:36:51Z","type":"stable","version":"10.0.0"},{"url":"https://github.com/questdb/questdb/releases/tag/9.4.3","date":"2026-06-15T17:01:58Z","type":"stable","version":"9.4.3"},{"url":"https://github.com/questdb/questdb/releases/tag/9.4.2","date":"2026-06-09T13:30:03Z","type":"stable","version":"9.4.2"},{"url":"https://github.com/questdb/questdb/releases/tag/9.4.1","date":"2026-06-03T08:03:25Z","type":"stable","version":"9.4.1"},{"url":"https://github.com/questdb/questdb/releases/tag/9.4.0","date":"2026-05-18T12:56:56Z","type":"stable","version":"9.4.0"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.5","date":"2026-04-13T17:21:09Z","type":"stable","version":"9.3.5"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.4","date":"2026-03-26T16:16:42Z","type":"stable","version":"9.3.4"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.3","date":"2026-02-25T14:23:44Z","type":"stable","version":"9.3.3"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.2","date":"2026-01-28T15:23:29Z","type":"stable","version":"9.3.2"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.1","date":"2026-01-14T16:41:31Z","type":"stable","version":"9.3.1"},{"url":"https://github.com/questdb/questdb/releases/tag/9.3.0","date":"2026-01-09T13:08:40Z","type":"stable","version":"9.3.0"},{"url":"https://github.com/questdb/questdb/releases/tag/9.2.3","date":"2025-12-18T12:13:27Z","type":"stable","version":"9.2.3"},{"url":"https://github.com/questdb/questdb/releases/tag/9.2.2","date":"2025-12-01T12:48:30Z","type":"stable","version":"9.2.2"},{"url":"https://github.com/questdb/questdb/releases/tag/9.2.1","date":"2025-11-25T14:38:23Z","type":"stable","version":"9.2.1"},{"url":"https://github.com/questdb/questdb/releases/tag/9.2.0","date":"2025-11-13T16:13:27Z","type":"stable","version":"9.2.0"},{"url":"https://github.com/questdb/questdb/releases/tag/9.1.1","date":"2025-11-03T15:25:09Z","type":"stable","version":"9.1.1"},{"url":"https://github.com/questdb/questdb/releases/tag/9.1.0","date":"2025-10-03T13:54:02Z","type":"stable","version":"9.1.0"},{"url":"https://github.com/questdb/questdb/releases/tag/9.0.3","date":"2025-08-29T18:32:12Z","type":"stable","version":"9.0.3"},{"url":"https://github.com/questdb/questdb/releases/tag/9.0.2","date":"2025-08-15T16:34:55Z","type":"stable","version":"9.0.2"}]` |
| reliability.sla_pct | - | 99.9 |
| reliability.status_page | yes | - |
| security.gdpr | - | yes |
| security.scorecard | 3.4 | 4.4 |
| security.soc2 | - | yes |
| security.vulnerabilities | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.kairosdb%3Akairosdb&per_page=100","last_12m":0,"max_severity":"MODERATE"}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.questdb%3Aquestdb&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Time-Series Databases)

| Capability | KairosDB | QuestDB |
|---|:--:|:--:|
| **Query** |  |  |
| Query language (SQL / PromQL / InfluxQL-Flux / Graphite) | REST API, Graphite protocol | SQL with time-series extensions (SAMPLE BY, ASOF, HORIZON JOIN, N-dimensional ar |
| SQL compatibility | Non-SQL | Full SQL |
| **Ingest** |  |  |
| Ingest model | Push | Push |
| **Model** |  |  |
| Data model | Metrics (labels/tags) | Wide events |
| **Lifecycle** |  |  |
| Downsampling / rollups | Continuous aggregates | Continuous aggregates |
| Retention / TTL | Manual | Automatic |
| **Storage** |  |  |
| Compression (columnar / delta / Gorilla) | - | columnar with frame compression |
| **Performance** |  |  |
| High-cardinality handling | Strong | Strong |
| **Scale** |  |  |
| Clustering / horizontal scale | Distributed / sharded | Distributed / sharded |
| Replication / HA | ✓ | ✓ |
| **Deployment** |  |  |
| Deployment | Self-hosted | Self-hosted |
| **Interop** |  |  |
| Prometheus remote-write compatible | - | - |
| **Licensing** |  |  |
| Licence class | Source-available | Permissive OSS |

*Source: vioscaleAI. Generated 2026-10-16T20:59:28.011Z. "-" = undocumented, not absent.*