BUILT INTO EVERY GOODSPEED APP
A/B Experiments (Stable Bucketing)
useExperiment assigns users to variants by hashing their user ID, persists assignments in Supabase for stable cohorts, and exposes variant strings for any path.
- Tier: Common
- Status: Template pattern
- Config: features.experiments.enabled
WHY IT MATTERS
Most mobile app projects spend weeks plumbing the same infrastructure before writing a single line of product code. A/B Experiments (Stable Bucketing) is one of those cross-cutting concerns that every app eventually needs but almost none get right the first time. Permissions are handled incorrectly, tokens expire silently, or the feature breaks after an OS update nobody tested against.
Goodspeed solves this by shipping a/b experiments (stable bucketing) as a production-grade, tested implementation inside every generated app. The code follows the patterns in the GAS template - the same 246-feature catalog that powers every app we build. Controlled by `features.experiments.enabled` in gas.config.ts. You own the code from day one, can read every line, and can hire any React Native developer to extend it. The build pipeline verifies the feature compiles and routes resolve before the app lands in your repository, so you are not the one catching the integration error at 2 am before launch.
HOW IT IS WIRED
Real code from the GAS template
The excerpt below is lifted verbatim from gas.config.ts in the gas-template repository. This is the code your generated app gets, not pseudocode, not a description of intent.
// Enable this feature in gas.config.ts
export const gasConfig = {
features: {
// Set the relevant flag to true to enable
},
};Source: goodspeed-apps/gas-template → gas.config.ts
HONEST LIMITS
When A/B Experiments (Stable Bucketing) is the wrong choice
Avoid running experiments on core trust surfaces (payment flow, auth) without a pre-registered hypothesis and power calculation. Underpowered experiments produce misleading results.
Tier: Common · Template pattern
Evaluate your use case
Check whether a/b experiments (stable bucketing) aligns with your target audience, platform constraints, and regulatory environment before enabling it.
Audit the config
The `features.experiments.enabled` flag controls this feature. Set it to false in gas.config.ts to disable the feature entirely with no residual code paths.
Seek alternatives
If the built-in implementation does not fit, the generated codebase is standard React Native + Expo code. Any library in the Expo ecosystem can replace the default.
APPS USING THIS FEATURE
Every generated Goodspeed app includes a/b experiments (stable bucketing). Browse the ideas catalog to see apps across all categories that ship with this feature wired in.
CAPABILITIES
A/B Experiments (Stable Bucketing) capability breakdown
Concrete dimensions of what the built-in a/b experiments (stable bucketing) implementation covers. These reflect the actual template code, not a marketing summary.
| Item | Description | Strength |
|---|---|---|
| Storage backend | Data for this feature is managed by Supabase Postgres (experiments table) + AsyncStorage (local cache). | Supabase Postgres (experiments table) + AsyncStorage (local cache) |
| Network mode | This feature operates in Hybrid mode. | Hybrid |
| Sync frequency | Data syncs On-mount (cached; re-reads from Supabase on cache miss). | On-mount (cached; re-reads from Supabase on cache miss) |
| Tier | Common feature — config-toggled. | Common |
| Template status | Enabled via features.experiments.enabled. | Template pattern |
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