The Canyon ReviewFeature flag platforms, ranked before you overbuy
LaunchDarkly, PostHog, Flagsmith, Unleash and a config file, ranked for teams under twenty engineers. Most of you need less than you think.
Under twenty engineers? PostHog if you already use it for analytics, Unleash if you want flags and nothing else, and a boring config file if you're honest about how few flags you have. LaunchDarkly is the best product in the category and the wrong purchase for almost everyone reading this site.
Criteria: price at 10 seats 40%, SDK quality and latency story 25%, self-host option 20%, complexity tax 15%. List prices as of June 2026.
The table
| Rank | Option | 10 seats, roughly | Self-host |
|---|---|---|---|
| 1 | Unleash | free OSS; paid from ~$80/mo | yes |
| 2 | PostHog flags | usage-based, generous free tier | mostly |
| 3 | Flagsmith | free tier, paid ~$45/mo | yes |
| 4 | LaunchDarkly | mid three figures monthly | no |
| 5 | A config file | $0 | it is one |
The part vendors won't say
Count your flags. Not the flags you might have: the ones you'd create this quarter. Teams under twenty engineers typically run a dozen long-lived flags and a rotating handful of release toggles. That workload does not need edge evaluation SLAs or a targeting rule DSL. It needs a boolean, a percentage, and the discipline to delete flags after rollout, which no vendor sells.
The config file ranks fifth, not last-as-a-joke. Plenty of good software ships behind flags that live in a YAML file and deploy with the code. A one-person site like Art Nikitin's engineering portfolio ships with zero flags and zero ceremony, and that end of the spectrum is bigger than the vendors' TAM slides admit; the question is which side of it your product actually sits on. The moment you need runtime changes without deploys, or percentage rollouts, move up the table.
Unleash wins the dedicated-tool bracket by being exactly one thing: open source flags you can self-host in an afternoon, with paid cloud when you stop wanting to. PostHog wins the consolidation bracket: flags ride the same SDK and bill as your analytics, and the free tier covers small products entirely, per their pricing.
The skip
Skip enterprise flag platforms until a compliance or scale requirement names them specifically. The mid-market pitch is "experimentation platform," and experimentation is a statistics problem before it's a tooling problem: without traffic volumes that make A/B results significant, the dashboard is theater. If someone on the team can say "power analysis" with a straight face, revisit.