# QuestDB vs TDengine

| Attribute | QuestDB | TDengine |
|---|---|---|
| **vioscaleAI score** | 49.9 (70% (medium)) | 54.5 (71% (medium)) |
| activity.commits_last_30d | 38 | 100 |
| adoption.dependent_repos | 106 | 7 |
| adoption.github_stars | 17,444 | 25,158 |
| content.faq | `[{"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}]` | `[{"answer":"AI-native industrial data platform and high-performance time-series database that unifies data ingestion, storage, analytics, modeling, visualization, and AI applications. It is indexed under Time-Series Databases.","source":"https://tdengine.com","question":"What is TDengine?","confidence":0.6},{"answer":"TDengine is open source, so it can be self-hosted and used at no licence cost. It is released under the AGPL-3.0 licence. Paid editions are also offered: Annual License and Perpetual License, priced on request. Pricing changes often, so verify at source before relying on it.","source":"https://tdengine.com","question":"Is TDengine free to use?","confidence":0.6},{"answer":"TDengine supports macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://tdengine.com/tsdb/pricing/","question":"What platforms does TDengine support?","confidence":0.6},{"answer":"Yes. TDengine can be deployed cloud / SaaS, hybrid and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://tdengine.com/tsdb/pricing/","question":"Can TDengine be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for TDengine, including Java, Python and Go. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://tdengine.com/tsdb/pricing/","question":"What does TDengine integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 and ISO 27001 for TDengine. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as TDengine not holding them. Always confirm compliance directly before you rely on it.","source":"https://tdengine.com","question":"What security certifications does TDengine have?","confidence":0.48},{"answer":"Yes. TDengine is published under the AGPL-3.0 licence, a copyleft licence, so check its terms before embedding it in a closed-source product. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/taosdata/TDengine","question":"Is TDengine open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true,"hybrid":true,"self_hosted":true}` | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | 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. | Open-source time-series database for real-time processing of high-volume sensor data, supporting distributed deployment and AI-powered analytics. |
| features.capabilities | `{"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"}` | `{"clustering":"distributed","data_model":"metrics","deployment":"self_hosted","downsampling":"continuous_aggregates","ingest_model":"push","licence_class":"source_available","query_language":"SQL","replication_ha":true,"high_cardinality":"strong","sql_compatibility":"full_sql"}` |
| integrations.count | 7 | 7 |
| integrations.list | `[{"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"}]` | `[{"name":"Java"},{"name":"Python"},{"name":"Go"},{"name":"MQTT","native":true,"category":"iot","direction":"inbound"},{"name":"Kafka","native":true,"category":"data_streaming","direction":"bidirectional"},{"name":"OPC","native":true,"category":"industrial","direction":"inbound"},{"name":"PI System","native":true,"category":"industrial","direction":"bidirectional"},{"name":"Excel","native":true,"category":"business_intelligence","direction":"outbound"},{"name":"Apache Pulsar","native":false,"category":"data_streaming","direction":"inbound"},{"name":"AVEVA Historian","native":false,"category":"industrial","direction":"inbound"}]` |
| language.primary | Java | C |
| license.spdx | Apache-2.0 | AGPL-3.0 |
| market.availability | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":true}` | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":true}` |
| pricing | `{"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"}` | `{"type":"hybrid","plans":[{"free":true,"name":"Free Tier","summary":"Free, up to 5,000 tags","features":["All TSDB and IDMP features","Official support available separately"],"components":[{"kind":"fixed","amount":0,"currency":"USD"}],"description":"Full functionality for up to 5,000 tags, suitable for evaluation, PoC, and small production deployments","contactSales":false,"includedLimits":{"tags":"5,000"}},{"free":false,"name":"Self-Hosted Annual License","summary":"From $12,500/year (7,500 tags). Pricing scales with deployment size.","features":["Standard support included","Product updates and patches"],"commitment":"annual","components":[{"kind":"fixed","amount":12500,"period":"year","currency":"USD"}],"description":"Annual subscription license for on-premises deployment, scaled by tag count","contactSales":false},{"free":false,"name":"Self-Hosted Perpetual License","summary":"From $31,250 (7,500 tags). One-time cost, pricing scales with deployment size.","features":["Perpetual usage rights","Optional annual support available"],"components":[{"kind":"one_time","amount":31250,"currency":"USD"}],"description":"One-time perpetual license for on-premises deployment, optional annual support","contactSales":false},{"free":false,"name":"Cloud - Starter","summary":"$970/month or $11,640/year","features":["Fully managed on AWS, Azure, or GCP","Managed infrastructure and operations"],"components":[{"kind":"fixed","amount":970,"period":"month","currency":"USD"},{"kind":"fixed","amount":11640,"period":"year","currency":"USD"}],"contactSales":false,"includedLimits":{"tags":"5,000"}},{"free":false,"name":"Cloud - Small","summary":"$1,740/month or $20,880/year","components":[{"kind":"fixed","amount":1740,"period":"month","currency":"USD"},{"kind":"fixed","amount":20880,"period":"year","currency":"USD"}],"contactSales":false},{"free":false,"name":"Cloud - Medium","summary":"$2,570/month or $30,840/year","components":[{"kind":"fixed","amount":2570,"period":"month","currency":"USD"},{"kind":"fixed","amount":30840,"period":"year","currency":"USD"}],"contactSales":false},{"free":false,"name":"Cloud - Large","summary":"$3,500/month or $42,000/year","components":[{"kind":"fixed","amount":3500,"period":"month","currency":"USD"},{"kind":"fixed","amount":42000,"period":"year","currency":"USD"}],"contactSales":false},{"free":false,"name":"Cloud - XLarge","summary":"$5,220/month or $62,640/year","components":[{"kind":"fixed","amount":5220,"period":"month","currency":"USD"},{"kind":"fixed","amount":62640,"period":"year","currency":"USD"}],"contactSales":false,"includedLimits":{"tags":"80,000"}}],"addOns":[{"name":"High Availability","components":[{"of":"base plan","kind":"percentage","rate":30}]},{"name":"Premium Support (24/7)"},{"name":"Optional Annual Support (Free Tier)","components":[{"kind":"fixed","amount":3375,"period":"year","currency":"USD"}]}],"summary":"Free tier up to 5,000 tags. Self-hosted annual licenses from $12,500/year, perpetual from $31,250. Managed cloud from $970/month. High availability at +30% of plan cost.","currency":"USD","freeTier":true,"sourceUrl":"https://tdengine.com/pricing/","retrievedAt":"2026-10-13T13:57:09.396Z","startingPrice":{"amount":970,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | freemium |
| pricing.price_level | low | high |
| pricing.starting_price | - | `{"amount":970,"currency":"USD"}` |
| pricing.transparent | no | yes |
| release.cadence_days | 16 | 28 |
| release.history | `[{"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"}]` | `[{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.6","date":"2026-04-30T02:07:04Z","type":"stable","version":"ver-3.4.1.6"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.0","date":"2026-04-01T14:18:08Z","type":"stable","version":"ver-3.4.1.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.9","date":"2026-03-02T12:27:15Z","type":"stable","version":"ver-3.4.0.9"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.2","date":"2026-02-02T09:15:26Z","type":"stable","version":"ver-3.4.0.2"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.0","date":"2026-01-08T02:43:19Z","type":"stable","version":"ver-3.4.0.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.8","date":"2025-12-02T13:40:22Z","type":"stable","version":"ver-3.3.8.8"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.4","date":"2025-11-04T02:12:50Z","type":"stable","version":"ver-3.3.8.4"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.1","date":"2025-10-11T08:51:59Z","type":"stable","version":"ver-3.3.8.1"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.0","date":"2025-09-30T06:44:35Z","type":"stable","version":"ver-3.3.8.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.7.5","date":"2025-08-28T01:51:47Z","type":"stable","version":"ver-3.3.7.5"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.7.0","date":"2025-07-29T08:24:00Z","type":"stable","version":"ver-3.3.7.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.6.13","date":"2025-07-01T12:29:08Z","type":"stable","version":"ver-3.3.6.13"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.6.9","date":"2025-06-03T11:44:31Z","type":"stable","version":"ver-3.3.6.9"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.6.6","date":"2025-05-15T07:53:55Z","type":"stable","version":"ver-3.3.6.6"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.6.3","date":"2025-04-15T00:58:09Z","type":"stable","version":"ver-3.3.6.3"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.6.0","date":"2025-03-25T11:58:53Z","type":"stable","version":"ver-3.3.6.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.5.8","date":"2025-02-28T14:18:53Z","type":"stable","version":"ver-3.3.5.8"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.5.2","date":"2025-01-20T07:07:35Z","type":"stable","version":"ver-3.3.5.2"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.5.0","date":"2025-01-02T08:27:47Z","type":"stable","version":"ver-3.3.5.0"},{"url":"https://github.com/taosdata/TDengine/releases/tag/ver-3.3.4.8","date":"2024-12-03T03:24:06Z","type":"stable","version":"ver-3.3.4.8"}]` |
| reliability.sla_pct | 99.9 | - |
| reliability.status_page | - | yes |
| security.certifications | - | `[{"name":"SOC 2 Type II","level":"Type II","status":"active"},{"name":"ISO 27001","status":"active"},{"name":"ISO 27017","status":"active"}]` |
| security.gdpr | yes | - |
| security.iso27001 | - | yes |
| security.scorecard | 4.4 | 4 |
| security.soc2 | yes | yes |
| security.trust_center | - | https://tdengine.com/security/ |
| security.vulnerabilities | `{"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}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40tdengine%2Fclient&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Time-Series Databases)

| Capability | QuestDB | TDengine |
|---|:--:|:--:|
| **Query** |  |  |
| Query language (SQL / PromQL / InfluxQL-Flux / Graphite) | SQL with time-series extensions (SAMPLE BY, ASOF, HORIZON JOIN, N-dimensional ar | SQL |
| SQL compatibility | Full SQL | Full SQL |
| **Ingest** |  |  |
| Ingest model | Push | Push |
| **Model** |  |  |
| Data model | Wide events | Metrics (labels/tags) |
| **Lifecycle** |  |  |
| Downsampling / rollups | Continuous aggregates | Continuous aggregates |
| Retention / TTL | 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 | Permissive OSS | Source-available |

*Source: vioscaleAI. Generated 2026-10-16T20:12:39.769Z. "-" = undocumented, not absent.*