Aiven vs Amazon RDS
SEPT 2026 auditA comparison of Aiven and Amazon RDS built from values read directly from each provider's own documentation, with the source recorded against every figure.
The short answer
Choose Aiven if…
Teams who want more than one open-source data service from one vendor and one bill — Postgres beside Kafka, ClickHouse or OpenSearch — with the availability tier chosen per service rather than fixed.
Editorial · Palash Bagchi · approved
Choose Amazon RDS if…
Teams already inside AWS, where the database sitting in the same VPC as everything else is worth more than any single feature on this page. Six engines, up to 35 days of point-in-time recovery, and read replicas you create and delete yourself.
Editorial · Palash Bagchi · approved
Consider something else if…
- Aiven: You want long recovery history on a cheap plan. Backup history is what the plan tiers buy here: two days on the entry paid plan against thirty at the top.
- Amazon RDS: You want a database per pull request. RDS documents no branching, and replicas are manual — AWS states outright that it does not autoscale them.
4 sourced criteria separate them — see where, with sources, below.
Pick the criteria you care about. The chart counts how many of them lean toward each provider — the same read as scanning the bars below, just totalled for the ones you chose.
Aiven 0
Amazon RDS 0
At a glance.
| Criterion | Aiven | Amazon RDS |
|---|---|---|
| Execution | ||
| Managed connection pooling | Supported — not on the Free or Developer tiers | Supported |
| Data | ||
| Engine | PostgreSQL, alongside MySQL, ClickHouse, OpenSearch, Valkey, Kafka, Flink and Grafana. Aiven runs the upstream projects rather than a compatible reimplementation, which is why its own docs point at postgresql.org for per-release detail. | PostgreSQL, alongside MySQL, MariaDB, Oracle, SQL Server and Db2. Each engine is a separate RDS product with its own version list and its own feature support, so a capability documented for one is not a capability of RDS as a whole. |
| Connection limit | Set per plan, not by a formula: 100 on the entry paid plan (Startup-4), rising to 200, 400, 800 and 1000 as the plan grows, with 25 on Hobbyist, 20 on Free and 15 on Developer. Aiven states plainly that it does not apply a per-GiB formula, and that some of the allowance is used by Aiven itself to manage the service. | Not a fixed number: RDS for PostgreSQL sets max_connections by formula from the instance's memory — LEAST({DBInstanceClassMemory/9531392}, 5000) — so a bigger instance class gets more connections and the ceiling is 5,000 however large it is. The parameter can be set by hand anywhere from 6 to 262,143, which is a limit on what you may configure rather than what an instance will serve. Other engines use different divisors: MySQL is memory/12582880 with no cap. |
| Point-in-time recovery | Bounded by the plan's backup history, so 2 days on the entry paid plan and 30 at the top. Granularity is fine within that: full backups daily with write-ahead logs copied every 5 minutes or per new file, whichever comes first. | Any point inside the configured backup retention period, so up to 35 days. Transaction logs are uploaded to S3 every five minutes, which is what bounds how close to now the latest restorable time can be. |
| Read replicas | Supported | Supported — 15 per primary, raisable on request |
| Backup retention | By plan: none on Hobbyist, 2 days on Startup, 14 on Business, 30 on Premium. The magnitude is Startup's 2 days, the entry paid plan. Aiven's high-availability page states 2 days for Hobbyist where the backups page states none — the backups page is the more specific of the two and is what is recorded here. | Between 0 and 35 days, set per DB instance; 0 disables automated backups entirely. The default depends on how the instance was created — one day via the API or CLI, seven days via the console — so there is no single default to quote. Multi-AZ DB clusters cannot be set below 1 day. |
Where they differ.
Engine
- Aiven
- PostgreSQL, alongside MySQL, ClickHouse, OpenSearch, Valkey, Kafka, Flink and Grafana. Aiven runs the upstream projects rather than a compatible reimplementation, which is why its own docs point at postgresql.org for per-release detail.
- Amazon RDS
- PostgreSQL, alongside MySQL, MariaDB, Oracle, SQL Server and Db2. Each engine is a separate RDS product with its own version list and its own feature support, so a capability documented for one is not a capability of RDS as a whole.
Sources (2) →Sources ↓
- Aiven for PostgreSQL® — Aiven docs ↗
“Aiven for PostgreSQL is the perfect fit for your relational data. A scalable SQL database solution that can be up and running within a few minutes. [...] Find a comprehensive per-release documentation on the PostgreSQL project website.”
Read 2026-09-09 · official docs
- Amazon RDS for PostgreSQL — Amazon Relational Database Service User Guide ↗
“Amazon RDS supports DB instances running several versions of PostgreSQL. [...] DB instances running PostgreSQL support Multi-AZ deployments, read replicas, Provisioned IOPS, and can be created inside a virtual private cloud (VPC).”
Read 2026-09-09 · official docs
Connection limit
- Aiven
- Set per plan, not by a formula: 100 on the entry paid plan (Startup-4), rising to 200, 400, 800 and 1000 as the plan grows, with 25 on Hobbyist, 20 on Free and 15 on Developer. Aiven states plainly that it does not apply a per-GiB formula, and that some of the allowance is used by Aiven itself to manage the service.
- Amazon RDS
- Not a fixed number: RDS for PostgreSQL sets max_connections by formula from the instance's memory — LEAST({DBInstanceClassMemory/9531392}, 5000) — so a bigger instance class gets more connections and the ceiling is 5,000 however large it is. The parameter can be set by hand anywhere from 6 to 262,143, which is a limit on what you may configure rather than what an instance will serve. Other engines use different divisors: MySQL is memory/12582880 with no cap.
Sources (2) →Sources ↓
- Connection limits per plan for Aiven for PostgreSQL® — Aiven docs ↗
“Default values of the max_connections setting vary according to the service plan: Plan Max connections Developer 15 Free 20 Hobbyist 25 Startup/Business/Premium-4 100 Startup/Business/Premium-8 200 Startup/Business/Premium-16 400 Startup/Business/Premium-32 800 Startup/Business/Premium-64 and above 1000 note Aiven can utilize any number of the connections for managing the service. Aiven for PostgreSQL doesn't apply a fixed per-GiB connection formula”
Read 2026-09-09 · official docs
- Quotas and constraints for Amazon RDS — Amazon Relational Database Service User Guide ↗
“PostgreSQL max_connections 6–262143 LEAST({DBInstanceClassMemory/9531392}, 5000) Maximum number of concurrent connections [...] DBInstanceClassMemory is in bytes.”
Read 2026-09-09 · official docs
Point-in-time recovery
Bounded by the plan's backup history, so 2 days on the entry paid plan and 30 at the top. Granularity is fine within that: full backups daily with write-ahead logs copied every 5 minutes or per new file, whichever comes first.
Any point inside the configured backup retention period, so up to 35 days. Transaction logs are uploaded to S3 every five minutes, which is what bounds how close to now the latest restorable time can be.
Sources (2) →Sources ↓
- Aiven for PostgreSQL® backups — Aiven docs ↗
“Aiven for PostgreSQL® databases are automatically backed up, with full backups made daily, and write-ahead logs (WAL) copied at 5 minute intervals, or for every new file generated. All backups are encrypted using pghoard, an open source tool developed and maintained by Aiven.”
Read 2026-09-09 · official docs
- Restoring a DB instance to a specified time for Amazon RDS — Amazon Relational Database Service User Guide ↗
“RDS uploads transaction logs for DB instances to Amazon S3 every five minutes. To see the latest restorable time for a DB instance, use the AWS CLI describe-db-instances command and look at the value returned in the LatestRestorableTime field for the DB instance. [...] You can restore to any point in time within your backup retention period.”
Read 2026-09-09 · official docs
Backup retention
- Aiven
- By plan: none on Hobbyist, 2 days on Startup, 14 on Business, 30 on Premium. The magnitude is Startup's 2 days, the entry paid plan. Aiven's high-availability page states 2 days for Hobbyist where the backups page states none — the backups page is the more specific of the two and is what is recorded here.
- Amazon RDS
- Between 0 and 35 days, set per DB instance; 0 disables automated backups entirely. The default depends on how the instance was created — one day via the API or CLI, seven days via the console — so there is no single default to quote. Multi-AZ DB clusters cannot be set below 1 day.
Sources (2) →Sources ↓
- Aiven for PostgreSQL® backups — Aiven docs ↗
“Backup retention time by plan The number of stored backups and the backup retention time depends on the service plan that you have selected. Plan Type Backup Retention Time Hobbyist None Startup 2 days Business 14 days Premium 30 days”
Read 2026-09-09 · official docs
- Backup retention period — Amazon Relational Database Service User Guide ↗
“If you create a DB instance using the Amazon RDS API or the AWS CLI and if you don't set the backup retention period, the default backup retention period is one day. If you create a DB instance using the console, the default backup retention period is seven days. [...] You can set the backup retention period of a DB instance to between 0 and 35 days. Setting the backup retention period to 0 disables automated backups. For a Multi-AZ DB cluster, you can set the backup retention period to between 1 and 35 days.”
Read 2026-09-09 · official docs
When these numbers change, hear about it. Sources are re-checked monthly; a repricing goes out as a short note.
Documented by only one.
These criteria are published by one provider and not the other. An absence here means we have not found a source, not that the feature is missing.
Questions this comparison answers.
Should I choose Aiven or Amazon RDS?
Pick Aiven if Teams who want more than one open-source data service from one vendor and one bill — Postgres beside Kafka, ClickHouse or OpenSearch — with the availability tier chosen per service rather than fixed.
Pick Amazon RDS if Teams already inside AWS, where the database sitting in the same VPC as everything else is worth more than any single feature on this page. Six engines, up to 35 days of point-in-time recovery, and read replicas you create and delete yourself.