Ultimate comparison: Redux side-effect middleware

redux-thunk, redux-saga, and redux-observable on the same row of criteria — an Ultimate Comparison: one sheet, numbers you can sort, and enough links to re-check later. Numbers here are a snapshot from when I exported the matrix (stars, downloads, and Bundlephobia figures drift); use them as signals, not contracts.

Raw export: ultimate-comparison-redux-side-effect-libs.csv.

What I’m comparing

| | redux-thunk | redux-saga | redux-observable | | --- | --- | --- | --- | | Mental model | functions that dispatch later | generator sagas, declarative effects | RxJS epics, actions as streams | | Typical fit | tiny async in Redux | long-running flows, cancellation | teams already fluent in Rx |

All three sit next to Redux / Redux Toolkit; RTK’s createAsyncThunk and RTK Query often replace thunk for new code, but the comparison stays useful for legacy apps and for “pure middleware” discussions.

GitHub (snapshot)

| | redux-thunk | redux-saga | redux-observable | | --- | --- | --- | --- | | Stars | 17.5k | 22.4k | 7.8k | | Open issues | 2 | 18 | 71 | | Open PRs | 1 | 2 | 15 | | Last activity (export) | ~2 days | ~3 weeks | May 16, 2022 | | License | MIT | MIT | MIT | | Contributors | 49 | 317 | 103 | | Used by (GitHub) | 1.7m | 281k | 21.1k | | Forks | 1.1k | 2k | 506 |

npm (snapshot)

| | redux-thunk | redux-saga | redux-observable | | --- | --- | --- | --- | | Version (export) | 2.4.2 | 1.2.2 | 2.0.0 | | Weekly downloads | ~3.1m | ~800k | ~157k | | Package dependencies | 0 | 1 | 2 | | Dependants | 6463 | 3026 | 613 | | TypeScript types in box | yes | yes | yes |

Bundle / cost (Bundlephobia snapshot)

| | redux-thunk | redux-saga | redux-observable | | --- | --- | --- | --- | | Minified | 352B | 13kB | 24kB | | Min + gzip | 236B | 5kB | 7.1kB | | Tree-shakeable (flag) | yes | yes | yes | | “Side-effect free” (flag) | yes | unclear | yes |

Community signals (snapshot)

| | redux-thunk | redux-saga | redux-observable | | --- | --- | --- | --- | | Stack Overflow — questions tagged | 2567 | 2492 | 684 | | Google Trends (relative, export) | lower | highest of three | lowest of three | | StackShare — stacks / followers | 254 / 170 | 386 / 335 | 53 / 43 |

How I use this format

Ultimate Comparison = same criteria down the left, same options across the top, fill from GitHub / npm / Bundlephobia / trends until the decision is boring. Next time I add a row (e.g. RTK Query-only baseline, or maintenance risk score), I re-export CSV and bump the narrative paragraph — not a holy table, a reusable scratchpad shape.