Ship config changes without redeploys.
Store JSON or toggle variables your app can fetch at runtime via API or SDK — update instantly, no rebuild needed.
JSON & toggles
Versioned history
REST API
Configuration baked into a build means every change is a deploy, a review, and a wait. Flowtag keeps it outside the build — change a value, and your app reads it next.
Stop baking configuration into your builds. Change how your app behaves at any moment, with a full audit trail and access controls built in.
Variables
Runtime config your app can always rely on — versioned, validated, and reachable from anywhere.
JSON Variables
Store structured config values up to 8 KB for flexible runtime behavior.
Toggle Flags
Boolean switches for instant on/off behavior control — no value parsing needed.
Version History
Every change is recorded with a full diff so you can audit and understand what changed and when.
Reads & Writes Tracking
See how often your app is fetching or updating each variable to understand real-world usage.
API & SDK Access
Fetch variables at runtime using scoped tokens. Works with any language via the REST API.
Schema Guardrails
Attach a JSON Schema to a variable and catch invalid payloads before they ship, so runtime config stays safe and predictable.
From variable to running app in three steps.
Create a variable
Pick a JSON value or a boolean toggle, and optionally attach a JSON Schema so invalid payloads are caught before they ship.
Up to 8 KBFetch it at runtime
Read the variable with a scoped token over the REST API or SDK. Works from any language, on any runtime.
Scoped tokensChange it without a build
Update the value and your app picks it up on its next read. Every edit is recorded with a full diff you can audit later.
Full diff historyFast variable reads across regions.
In a multi-region run, the Variables API scored 97% with grade A and 115ms average TTFB.
Grade
A
Score
97%
Avg TTFB
115ms
Best in Europe
46ms (Warsaw)
Best in Americas
48ms (Dallas)
Slowest in Europe
170ms (Paris)
Slowest in Americas
209ms (Santiago)
Tests performed by SpeedVitals on May 16th, 2026
Change your app without shipping a build.
Free plan included. No credit card, no sales demo, no config service to run yourself.
Free forever plan
No credit card, no trial countdown, no setup call.
Audited by default
Every change is recorded with a full diff, on every plan.
Works with any stack
Scoped tokens and a REST API, callable from any language.