#35 in Application SecurityUpdated 2026-08

Abby

by Abby · Open source, type-safe feature flags and remote config for developers

31.5 — BenchRank score out of 100

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Pricing page

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Overview

Abby is an open source feature flagging and remote config service with typed SDKs for React, Next.js, Svelte and Angular. Flags, remote config variables and A/B test variants are declared in one typed config, with separate environments per flag and SDK fallbacks to limit downtime. It supports SSR and SSG, ships optional devtools for debugging, and can be self-hosted.

Best for: Engineering teams on React, Next.js, Svelte or Angular wanting typed feature flags and remote config
Pricing: Free Starter tier, then $12/month per project for Startup and $89/month per project for Pro, with a contact-sales Enterprise plan.
Runs on: WebSelf-hosted

Strengths and trade-offs

Strengths

Typed SDKs for React, Next.js, Svelte and Angular
Open source, with the option to self-host
SSR and SSG supported out of the box
Devtools for debugging flags and config; CLI in beta

Trade-offs

Priced per project, so running several projects multiplies the cost
Free tier caps you at 1,000 events, 1 A/B test and 3 flags
A/B tests stay capped at 10 on both paid tiers below Enterprise
Captured pages give no detail on self-hosting requirements or support

Pricing

Published plans from Abby’s own pricing page, in USD. Usage charges and add-ons may apply on top.

Abby pricing tiers, monthly rates in USD
Plan	Monthly	Includes
Starter	Freeper project	1,000 events / month 1 A/B test 3 feature flags / remote configs 5 environments
Startup	$12per project	10,000 events / month 10 A/B tests 30 feature flags / remote configs 5 environments
Pro	$89per project	100,000 events / month 10 A/B tests 50 feature flags / remote configs 10 environments
Enterprise	Contact sales	Unlimited events / month Unlimited tests Unlimited feature flags / remote configs Unlimited environments

How this score is made up

Each dimension is scored out of 100 and combined into the headline score using fixed weights.

MCP support: 0 out of 100
Documentation: 50 out of 100
Agent friendliness: 61 out of 100
Changelog: 0 out of 100
Marketing site structure: 50 out of 100
Operational trust: 40 out of 100

Measured, but not part of the score

Useful to know, but not a mark for or against the product — so these do not affect the ranking.

Openness: 40 out of 100
Maintenance: 15 out of 100

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