head to head · open source
Prometheus vs realm-swift
Prometheus has 66,109 GitHub stars, 10,839 forks, 890 open issues and last shipped yesterday. realm-swift has 16,609 stars, 2,241 forks, 499 open issues and last shipped 3 days ago. Prometheus leads on adoption by 298% (66,109 vs 16,609 stars). Prometheus is written in Go under Apache-2.0; realm-swift is written in Objective-C under Apache-2.0. Prometheus has attracted 16% as many forks as stars, realm-swift 13%. Prometheus was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Prometheus | realm-swift | |
|---|---|---|
| GitHub stars | ★ 66K | ★ 17K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Objective-C |
| Last push | 2026-09-17 | 2026-09-15 |
| Forks | ⑂ 11K | ⑂ 2.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prometheus if
- You weight community size — 66K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick realm-swift if
- You want the realm-swift feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Objective-C
- You evaluated both and realm-swift fits your workflow better
About Prometheus
Prometheus is an open source monitoring system and time series database, part of the Cloud Native Computing Foundation ecosystem. It collects metrics from configured targets at defined intervals, evaluates alerting rules, and visualizes results. Designed for reliability in dynamic environments, it operates without reliance on distributed storage, ensuring each server node functions independently.
read the full Prometheus overview →
About realm-swift
Realm Database is a mobile database that runs directly inside phones, tablets, and wearables, and it is for iOS, macOS, tvOS, and watchOS developers who need a replacement for Core Data and SQLite.
read the full realm-swift overview →
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Frequently asked questions
Is Prometheus or realm-swift more popular?
Prometheus has 66,109 GitHub stars and realm-swift has 16,609. Prometheus has the larger community by that measure.
Are Prometheus and realm-swift free?
Both are open source. Prometheus is licensed under Apache-2.0 and realm-swift under Apache-2.0. Neither carries a licence fee.
What is the difference between Prometheus and realm-swift?
Prometheus is written in Go and realm-swift in Objective-C. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Prometheus or realm-swift?
Choose Prometheus if you want the larger community (66,109 stars) or its Apache-2.0 licence terms. Choose realm-swift if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.