CATEGORY · 42 SERVICES

Feature flags & gradual rollout

Compare included quotas, restrictions and official provider documentation.

Free allowance

50.000 flag API requests/month; one team member and one project; unlimited feature flags

Keep in mind

Free Cloud is limited to 50.000 counted API requests/month and 1 team member; fair-use terms apply. If Free exceeds its monthly limit, Flagsmith allows 7 days to upgrade before action is taken; do not assume unlimited free overage. Additional team members, scheduling and A/B testing require paid plans.

Free allowance

Apache-2.0 open-source Kubernetes operator for feature flags, injecting flagd sidecars and exposing flag evaluation via gRPC and HTTP; no software license fee or vendor quota.

Keep in mind

Requires a user-operated Kubernetes cluster and flagd sidecars; infrastructure and monitoring are not free. The operator resolves cross-namespace resources, with documented multi-tenant isolation risk GHSA-398h-7f66-3h4p; apply upstream mitigations.

Free allowance

Unlimited seats and feature flags; five service connections; 1.000 client-side MAU/month

Keep in mind

Developer is $0/month with no card required, limited to 5 service connections and 1.000 client-side MAU/month; additional paid entitlements and advanced capabilities belong to Foundation/Enterprise plans. Commercial-use eligibility beyond the published Developer terms remains unconfirmed.

Free allowance

1 project; 10 flags; 2 environments; 1 developer; unlimited evaluations

Keep in mind

Free is permanent without a credit card or trial deadline: 1 project, 10 flags, 2 environments, up to 3 team members and 7-day audit logs. Paid tiers unlock larger teams, more projects/environments, scheduled changes and longer audit history.

Free allowance

2 projects/workspace; unlimited flags; 3 environments; 3 seats; 75.000 evaluations/month; 50 AI messages/month

Keep in mind

Ongoing Free ($0, no card) is limited to one workspace, two projects, three environments, three seats, 75.000 evaluations/month and 50 AI messages/month. Higher quotas, audit logs, RBAC and full API access belong to paid plans. The advertised $20 per 1M extra evaluations is an additional paid-usage rate, not an included Free allowance; confirm overage enforcement before relying on a hard stop.

Free allowance

1.000 client-side MAUs; 10.000 cloud config requests/month; 100K server config requests/month; 5.000 events/month; unlimited feature flags and seats

Keep in mind

Client-side MAUs count unique client SDK initializations, while cloud-bucketing requests, server SDK configuration fetches and events have separate quotas. Free has no credit card requirement. Paid Business features and overages are separate; the pricing page does not clearly specify Free over-quota behavior, so do not assume unlimited calls or automatic billing.

Free allowance

3 users, 1 project, unlimited feature flags, experiments and traffic; optional managed warehouse includes 1 million events/month

Keep in mind

Cloud Starter is free without a card. Bring-your-own data warehouse may have separate infrastructure charges; advanced AI Visual Editor, governance and multi-project features require Pro. The self-hosted Open Source edition is separate.

Free allowance

500 monthly active contexts; unlimited flags, projects and users

Keep in mind

Permanent Free tier includes 500 monthly active contexts and unlimited projects, users and flags, without a card. The separate 30-day Team trial does not make Free time-limited. Hosted MCP/Management API, audit logs and advanced lifecycle reporting require paid plans.

Free self-hosted software
Free allowance

Self-hosted Unleash Open Source feature-flag management with gradual rollout and SDK integration.

Keep in mind

You run the flag server and data store. Check the open-source edition's feature limits; enterprise hosting, governance, and support may require payment.

Free self-hosted software
Free allowance

Self-hosted Flagsmith feature-flag and remote-configuration platform with SDK-based evaluation.

Keep in mind

You provide server and database resources. Cloud usage allowances do not apply; hosted support and certain enterprise capabilities are separate.

Free allowance

OpenFeature provides free, vendor-neutral SDKs and an API specification for evaluating feature flags in applications.

Keep in mind

OpenFeature is a specification and SDK ecosystem, not a hosted flag-management service. You still need a provider and flag backend; their hosting and licensing may incur costs.

Free allowance

7.500 monthly active users; 100 concurrent server connections; 2 projects; unlimited flags, environments and seats; 30-day audit log.

Keep in mind

Free tier has soft MAU and connection limits; the provider warns rather than immediately disabling flag evaluations. Advanced features including segments, change approvals, and several roadmap items require paid tiers or are not yet available.

Free allowance

10 feature flags; 2 environments; 2 products; 5 million config JSON downloads/month; 20 GB network traffic/month; unlimited seats, service connections, MAUs and local flag evaluations.

Keep in mind

Free plan caps flags, environments, products, targeting rules and monthly CDN downloads/traffic; higher limits and advanced governance require paid plans. ConfigCat counts config JSON downloads rather than individual flag evaluations; commercial-use eligibility is not explicitly confirmed.

Free allowance

2 million metered events/month; unlimited feature flag and config checks; 50.000 session replays/month; unlimited seats.

Keep in mind

Developer has 1-year analytics retention and 30-day session replay retention; advanced approvals and higher quotas require Pro. Above 2M events, metric-lift computations stop while gate/config targeting continues; upgrading requires a card. Hosted commercial-use terms not independently confirmed.

Free self-hosted software
Free allowance

MIT-licensed self-hosted feature flag system with unlimited feature flags and no vendor-imposed seat, evaluation or monthly request limits; OpenFeature SDKs and stateless relay proxy.

Keep in mind

Self-host and maintain the relay proxy, configuration storage and any supporting infrastructure; hosting, monitoring and maintenance costs are not included. Dedicated enterprise support and security-response SLA are paid separately.

Free allowance

Apache-2.0 open-source feature-flag evaluation engine with local/remote flag sources, targeting rules, real-time updates and progressive rollouts; no vendor-imposed flag or evaluation quota when self-hosted.

Keep in mind

Self-hosted software only; provide your own compute, configuration and flag source. No built-in UI, management console or persistence layer. Operational infrastructure costs are separate.

Free self-hosted software
Free allowance

Apache-2.0 open-source Flagr service for feature flags, A/B experiments, dynamic configuration, and API-based variant evaluation; no vendor-imposed seat or evaluation quota when self-hosted.

Keep in mind

You operate and pay for compute, database, backups, security, and availability. SQLite is suitable for a local demo; production deployments should configure a persistent MySQL/PostgreSQL database and TLS. Hosted demo is not a production service.

Free self-hosted software
Free allowance

Apache-2.0 open-source self-hosted feature flag management and A/B experimentation with unlimited team members, environments and evaluations; no vendor software seat or evaluation quota.

Keep in mind

You operate and pay for MySQL, Redis, compute, storage, TLS, backups and any Kubernetes/cloud integrations. Docker Compose Lite is for smaller deployments; production requires proper security and operational setup. No managed hosting included.

Free self-hosted software
Free allowance

MIT-licensed Git-based feature flags, A/B experiments and remote configuration; unlimited definitions evaluated locally by SDKs using self-hosted static JSON datafiles.

Keep in mind

Requires your own Git repository, CI build and hosting/CDN for generated datafiles; no managed dashboard or hosted allowance. Infrastructure and delivery costs are separate; retain MIT license notices.

Free allowance

Free-forever self-hosted Foundation feature flag platform with feature toggles, targeting, SDKs and integrations; official pricing states no limits on seats, MAU, projects or service connections.

Keep in mind

Open-core product: some enterprise capabilities, advanced RBAC, support and licensed features require a paid key; the core code is MIT licensed but not all repository features are unrestricted. Requires your own infrastructure, database, upgrades and security operations.

Free allowance

Free Apache-2.0 Java feature-flag framework with toggle evaluation, audit and pluggable stores; no vendor-imposed flags, users or environment quotas.

Keep in mind

Self-managed Java library and optional console, not a hosted SaaS. Application hosting, storage, monitoring and rollout safety remain your responsibility.

Free allowance

Free Apache-2.0 Java feature-toggle framework with runtime flag evaluation and user-specific activation strategies; no vendor-imposed flag or seat quotas.

Keep in mind

Library for Java applications, not a managed feature-flag cloud service. Host and operate your own application and state storage; feature management and rollout integration are your responsibility.

Free allowance

Free MIT-licensed self-hosted Ruby feature flags with local persistent adapters, actor/group/percentage rollouts and optional basic flipper-ui administration; no cloud subscription or vendor request quota.

Keep in mind

Designed for Ruby/Rails applications; requires your own application and datastore. Advanced hosted collaboration, audit history, permissions and polished Flipper Pro UI are not part of Cloudless.

Free allowance

Free self-hosted FeatureHub Open Source edition with unlimited users, flags, applications, environments and feature requests according to the project's official repository.

Keep in mind

Current LICENSE.txt includes Commons Clause on top of Apache-2.0: selling/hosting the software itself as a paid service is restricted; ordinary internal commercial use differs from resale. SaaS is paid after its 30-day trial. Self-hosted infrastructure is not free.

Free allowance

Apache-2.0 licensed open-source feature management service; self-host feature toggles, progressive rollouts, targeting and A/B experiments using Docker Compose with no vendor-set software subscription or usage quota.

Keep in mind

Self-hosting requires your own compute, database and operations; change the documented default admin password before exposure. Hosting costs and any managed service are separate. Project's latest code push was June 2026.

Free allowance

Free forever hosted feature flags: up to 5 seats, 1 project, 2 environments, unlimited feature flags and 1 million SDK requests/month; targeting, segments and progressive rollouts; no credit card.

Keep in mind

7-day audit trail and community support. New accounts start with a 14-day Business trial, then automatically move to the ongoing Free plan without deleting flags. The 1M SDK request allowance is described as fair use; explicit commercial-use terms are not independently confirmed.

Free allowance

Apache-2.0 self-hosted feature flag API and admin dashboard with targeting rules, percentage rollouts, SSE updates, audit logs and OpenFeature integration; no vendor-imposed request or seat quota for the self-hosted core.

Keep in mind

Requires your own Docker or Kubernetes hosting, PostgreSQL, storage, operations and security maintenance. Open-core product; optional proprietary features and managed infrastructure are not included.

Free allowance

Up to 100K Remote Config fetch requests per day per project at no cost, effective September 1, 2026; A/B Testing, Rollouts and Personalization included.

Keep in mind

Above the daily free allowance on pay-as-you-go plans, per-request charges apply; quotas and limits still apply. This is a distinct Firebase Remote Config product, not Firebase Hosting or Realtime Database.

Free allowance

Free-forever Developer plan for personal use: 25 feature flags, 50.000 SDK evaluations/month, up to 3 team members, Next.js/React SDKs and basic targeting; no card required.

Keep in mind

Developer plan is explicitly for personal use; Startup/Business plans unlock higher quotas and production-oriented environments. Exceeding free limits triggers a 7-day grace period before degradation.

Free allowance

MIT-licensed self-hosted feature-flag management with targeting, environments, organizations, audit logs and Docker Compose deployment; no software usage quota stated.

Keep in mind

Self-hosted open-source edition; server, database, security, backups and operations are not provided free. Hosted Togglely service has separate terms and is not included.

Free allowance

Apache-2.0 open-source Docker service for environment-scoped feature flags and remote configuration, with REST API, dashboard and SQLite/libSQL; no vendor-imposed software seat, flag or request quota.

Keep in mind

You operate and pay for Docker/server, persistent storage, networking, backups and TLS; not a free vendor-hosted service. No built-in per-user targeting, percentage rollout or experiment analytics; follow Apache-2.0 notice requirements.

Free allowance

Hosted $0/month Free plan with 500K SDK configuration syncs per month; unlimited local evaluations, flags, segments, projects, environments and seats; no credit card or trial expiry.

Keep in mind

Hosted-only; no self-hosted offering. SDKs poll for configuration (30-second default); syncs count against monthly allowance. Provider says no overage but may move accounts to another plan when exceeding quota; verify upgrade consent and business-use terms before relying on production billing. Free tier has no support SLA.

Free allowance

Official $0/month hosted Free plan with 5 boolean feature flags, 1 project, 2 environments, 1.000 monthly active users and 2 seats.

Keep in mind

Paid Starter/Pro/Enterprise tiers offer separate 14-day trials, not part of this ongoing Free plan. Free excludes advanced flag types, streaming, segmentation and audit workflows; credit-card and commercial-use terms for Free are not explicitly confirmed. Exceeding the MAU/flag limits may require upgrading.

Free allowance

CC0-1.0 Django feature-flag library; configurable flags in Django settings and admin, including user/date/URL conditions; no software usage quota.

Keep in mind

Requires Python 3.10+ and Django 4.2+; runs inside your own Django application and infrastructure. No hosted flag service or managed storage is included.

Free allowance

BSD-3-Clause Django feature-flag library with flags, switches and samples; no vendor software usage quota.

Keep in mind

Requires your own Django application, database and optional cache; no hosted feature-flag dashboard or infrastructure is included. Follow BSD notice and non-endorsement conditions.

Free allowance

MIT-licensed local CLI and zero-dependency SDK for file-based feature flags and A/B experiments: store Markdown flag definitions in your repository, validate them, generate a typed TypeScript client and evaluate assignments locally without a hosted control plane.

Keep in mind

The free CLI/SDK has no signup or license fee, but you provide your own application hosting, CI and analytics. Optional dif.sh Cloud connection and cloud analytics are separate services that may have charges; do not confuse the local MIT software with a free hosted analytics tier. The project is relatively new and APIs may evolve.

Free allowance

Always Free hosted Starter plan: 1 application, 2 environments, unlimited feature flags, usage dashboard, A/B testing business metrics and digitally signed definitions.

Keep in mind

The hosted Starter tier is limited to one app and two environments; additional apps, team members, integrations and API access are advertised under paid Team/Business plans. Provider's Free Forever signup docs say no card required; commercial-use rights for the hosted Starter plan are not explicitly confirmed.

Free allowance

500K feature-flag requests/month; unlimited flags; 3 projects, 3 environments, 3 seats; 12 SDKs on vendor-hosted Free plan.

Keep in mind

Free tier is described for side projects and evaluation; confirm production/commercial-use terms before relying on it. No self-hosted plan is currently available (listed as coming soon). Upgrade or over-quota billing/stop behavior is not documented clearly; verify with provider before exceeding 500K requests.

Free allowance

Free forever vendor-hosted plan: 10.000 API calls/month; 25 feature flags, 10 remote configs, 2 projects, 2 environments, 2 team members; 10 session replays/month.

Keep in mind

Free plan has small API, project, replay and team quotas. Paid Premium plans have 7-day trials that bill automatically; do not confuse them with the ongoing Free tier. Confirm production/commercial terms, whether Free usage hard-stops at limits, and any add-on/overage charges before scaling.

Free allowance

MIT-licensed self-hosted feature-flag API, dashboard and JavaScript/React SDKs; no vendor software subscription or published self-hosted flag-evaluation quota.

Keep in mind

Requires self-operated Bun/SQLite or Docker infrastructure, storage, backups, HTTPS and security maintenance. Hosting, bandwidth and any external cloud services are not included; this is not a free vendor-hosted feature-flag account.

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