Feature flagging has grown from a simple on/off switch into a full experimentation and progressive-delivery layer. In 2026, the field is shaped by one notable piece of market consolidation: Split Software, long considered one of the “big three” alongside LaunchDarkly and Unleash, was acquired by Harness in 2024 and now ships as Harness Feature Management & Experimentation (FME). This piece still compares the three under their familiar names, since Split’s engine lives on inside Harness, but buyers should know the standalone Split.io product and self-serve pricing page no longer exist independently.
At a Glance
| Platform | Starting Price | Free / Open Tier | Best For |
|---|---|---|---|
| LaunchDarkly | Foundation: pay-as-you-go, no platform fee, from $10/service connection/month and client-side MAU usage | Developer plan: $0/month forever, unlimited flags and seats, 100K experimentation MAU/month | Enterprises wanting the most mature targeting, release automation, and experimentation suite as a managed SaaS |
| Split (now Harness FME) | Not publicly listed; sales-only since the 2024 Harness acquisition | None published independently of Harness’s broader plans | Existing Harness customers who want flags and experimentation bundled with CI/CD, as part of a larger platform deal |
| Unleash | Pay-As-You-Go (Cloud or self-hosted, 5-seat minimum): $75/seat/month | Open Source (self-hosted, AGPL-3.0): free, unlimited use | Engineering teams that want full self-hosting control or to avoid per-MAU SaaS billing |
Short Verdict
LaunchDarkly remains the most feature-complete SaaS platform, with a genuinely useful free Developer tier and a pay-as-you-go Foundation tier that avoids a big upfront commitment. Unleash is the clear choice if self-hosting, open-source licensing, or avoiding vendor lock-in on your flag data matters — its core is free under AGPL-3.0 and its paid Cloud tier is simple per-seat pricing. Split’s independent identity has effectively dissolved into Harness FME, so it’s really now a question of whether you want feature flags as a standalone product (LaunchDarkly, Unleash) or bundled into a broader Harness CI/CD/security platform deal.
What They Are
LaunchDarkly is a SaaS feature management and experimentation platform offering flag targeting, progressive rollouts, and built-in A/B testing (including Bayesian, frequentist, sequential, and multi-armed bandit analysis methods per its own feature comparison). It is primarily cloud-hosted; a Relay Proxy component can be self-hosted to cache flag data and reduce latency or outbound connections, but the core control plane remains LaunchDarkly’s SaaS.
Split built its reputation on pairing feature flags tightly with experimentation and real-time impact monitoring. Harness announced its acquisition of Split Software in May 2024, and the product is now sold as Harness Feature Management & Experimentation (FME), integrated with Harness’s AIDA AI capabilities and its wider CI/CD and software delivery platform rather than sold as a freestanding product with public pricing.
Unleash is an open-source feature flag platform (core engine under AGPL-3.0, per its GitHub repository) that can be fully self-hosted via Docker, or consumed as Unleash-hosted Cloud/Enterprise plans. It emphasizes “host it on-premise or in the cloud” flexibility as a core selling point, which distinguishes it from the SaaS-first LaunchDarkly model.
Targeting and Rollout Features
- LaunchDarkly: user/account/device-level targeting, segments, percentage-based rollouts, and a full experimentation suite (A/B/n testing, Bayesian and frequentist analysis, sequential testing, multi-armed bandits) shown across its plan comparison table, plus Enterprise-tier advanced targeting, custom roles, approval workflows, and release automation.
- Split / Harness FME: targeting rules, environments, and pipeline-aware rollouts are documented in Harness’s developer docs, but current self-serve plan-by-plan feature gating is not published, since the product is now quoted through Harness sales.
- Unleash: flexible hosting plus standard targeting strategies and multi-environment/project support; Enterprise and Pay-As-You-Go tiers add advanced access control, private hosted instances, multi-region Edge, and access logs/IP restrictions as add-ons.
Pricing Breakdown
| Platform / Tier | Price | Notes |
|---|---|---|
| LaunchDarkly Developer | $0/month, forever | Unlimited seats and flags, 100K experimentation MAU/month, 1K client-side MAU, 5K AI runs/month |
| LaunchDarkly Foundation | Pay-as-you-go, billed yearly; ~$10 per service connection/month and per-1K client-side MAU usage | No platform or seat fees; 14-day trial; 5K AI runs included, extra at $5/1K |
| LaunchDarkly Enterprise | Custom | Advanced targeting, custom roles/teams, approval workflows, release automation, SSO/SAML (included at every tier); separately priced Guardian add-on for automatic rollback |
| Split / Harness FME | Not publicly listed | Sold through Harness sales as a module within Harness’s broader platform; see Harness pricing page for context |
| Unleash Open Source | $0 | Self-hosted, AGPL-3.0 licensed, unlimited use |
| Unleash Pay-As-You-Go | $75/seat/month | Unleash-hosted Cloud by default, or self-hosted with a 5-seat minimum; 53M API requests/month included, then $5/million; 99.9% uptime SLA |
| Unleash Enterprise | Custom, annual contract | Cloud, self-hosted, or hybrid; 99.99% uptime SLA, guided onboarding, add-ons for private hosted instance and multi-region Edge |
Pros and Cons
LaunchDarkly
- Pros: strongest free tier of the three for getting started, no seat caps on Developer, mature experimentation methodology options, SSO included at every tier.
- Cons: SaaS-only control plane (the Relay Proxy only caches, it doesn’t replace the cloud backend), usage-based billing on service connections and client-side MAU can get expensive at scale.
Split / Harness FME
- Pros: deep integration potential with Harness’s CI/CD, security, and AIDA AI tooling for teams already standardized on Harness.
- Cons: no public pricing or free self-serve tier any more; evaluating it now means engaging Harness sales rather than trying it independently.
Unleash
- Pros: genuinely free and open-source core, full self-hosting control over flag data, simple flat per-seat pricing with no MAU metering on the hosted plans.
- Cons: AGPL-3.0 licensing has stricter obligations than permissive licenses for some commercial redistribution scenarios, and its experimentation/analytics feature depth is generally considered less mature than LaunchDarkly’s.
Who It’s a Good Fit For / Who Should Look Elsewhere
LaunchDarkly is the easiest default for teams that want a managed SaaS platform, strong out-of-the-box experimentation statistics, and a free tier to start on before scaling into usage-based pricing. It’s a weaker fit for teams with strict data-residency or self-hosting requirements for the control plane itself.
Split / Harness FME is worth evaluating only if you’re already in, or planning to move to, the Harness ecosystem for CI/CD and want flags as part of that bundle. It’s a poor fit if you want transparent self-serve pricing or a product that can be adopted independently of a larger platform decision.
Unleash is the strongest fit for engineering organizations that want to self-host, need to keep targeting data in their own infrastructure for compliance reasons, or simply want predictable flat per-seat pricing instead of MAU-based billing. It’s a weaker fit for teams that want the deepest built-in statistical experimentation tooling without building more themselves.
Bottom Line
For most teams starting fresh, LaunchDarkly’s free Developer tier and pay-as-you-go Foundation plan offer the lowest-friction path to a mature feature-flag and experimentation platform. Teams that need self-hosting or want to avoid SaaS lock-in should look at Unleash’s open-source core first. Split is no longer really a third independent option — it’s now a decision about whether to buy into the broader Harness platform.
FAQ
Is Split.io still sold as a standalone product?
No. Harness announced its acquisition of Split Software in May 2024, and the product is now marketed as Harness Feature Management & Experimentation (FME) with pricing handled through Harness sales rather than a public self-serve page.
Can I self-host LaunchDarkly entirely?
Not the control plane. LaunchDarkly offers a self-hostable Relay Proxy that caches flag data and manages SDK connections closer to your infrastructure, but the core management service remains LaunchDarkly’s SaaS.
Is Unleash’s free tier really unlimited?
The Open Source edition, self-hosted under its AGPL-3.0 license, has no seat or usage caps imposed by Unleash itself — you run and scale it on your own infrastructure. Paid Cloud/Enterprise tiers exist for teams that want Unleash to host it, with support SLAs and additional features.
Which platform is cheapest for a small team?
For a very small team, LaunchDarkly’s free Developer plan or Unleash’s self-hosted Open Source edition both cost $0, but Unleash requires you to run the infrastructure yourself, while LaunchDarkly’s free tier is fully managed with usage caps.
Sources
- LaunchDarkly — Pricing
- Unleash — Pricing
- Unleash — GitHub Repository (license)
- Harness — Press Release: Harness Acquires Split Software
- Harness — Pricing
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