What AI assistants actually recommend when buyers ask about open-source feature flag tools — measured on a rolling 4-week window across 4 engines, published as open data.
Updated 2026-09-17 · 28 sampled answers · rolling 4-week window · methodology
Rankings are measured from sampled AI answers — never editorial, never paid. Orbator builds AI-visibility tooling; when Orbator itself appears in any category, it is measured by the same rules as everyone else.
Measured by Orbatormethodology owner Henrik Tellewindow ends Sep 17, 2026
Sample: 28 AI answers · Window: Aug 20, 2026 – Sep 17, 2026 (4-week rolling) · trend vs prior 4 weeks (98 answers)
Samples by engine: GEMINI 7 (last run Sep 6, 2026) · CHATGPT 7 (last run Sep 6, 2026) · CLAUDE 7 (last run Sep 7, 2026) · PERPLEXITY 7 (last run Sep 6, 2026) · GROK 0 (last run Aug 18, 2026 — stalest)
How these numbers are made: sampling design · prompt provenance · what counts as a mention · what we cannot see
On the record: This ranking is frozen as a dated snapshot every day. View this category's history to see what entered and left the ranking and when, or read what the engines actually said on a given day.
Across 28 sampled AI answers from 4 engines, Unleash is recommended most often — appearing in 75% of recommendations, followed by GrowthBook (75%) and Flagsmith (67.9%).
This is a measurement of share of voice across 4 AI engines — not an editorial pick. See the full ranking below.
Orbator asked Gemini, ChatGPT, Claude and Perplexity buyer questions about open-source feature flag tools and sampled 28 answers between Aug 20, 2026 and Sep 17, 2026. Recommendation share counts the answers that recommended or listed a product, so a passing mention or a warning adds nothing to it. A category publishes once it holds at least 20 independently sampled answers in the window. Read the full methodology or download this ranking as CSV.
Buyer prompts in this window split five ways, from self-hosting for gradual rollouts to data sovereignty rules in a banking app. Unleash led the recommendation intent at 100% of 12 runs and the best-in-category intent at 91.7% of 12 runs. GrowthBook and Unleash both led the alternatives intent at 100% of 6 runs. Flagsmith led the problem-solving intent, the one about A/B testing and user targeting, at 66.7% of 6 runs, and tied the comparison intent at 33.3% of 6 runs with Unleash. Published pricing, all last verified 2026-09-05, sits at Pay-As-You-Go $75 a month for Unleash, Start-Up $40 a month for Flagsmith, Pro $40 a month for GrowthBook, and Flipt Pro $200 a month, each with a free tier. Weigh which intent matches the shortlisting question in hand.
| # | Product | Share | Trend | Engines | |
|---|---|---|---|---|---|
| 1 | getunleash.io | 75% 95% CI 56.6–87.3% 21 mentions · avg pos 2.3 first pick 42.9% | — | GEMINI 85.7%CHATGPT 71.4%CLAUDE 71.4%PERPLEXITY 71.4% | Claim |
| 2 | growthbook.io | 75% 95% CI 56.6–87.3% 21 mentions · avg pos 4.5 first pick 9.5% | — | GEMINI 85.7%CHATGPT 71.4%CLAUDE 71.4%PERPLEXITY 71.4% | Claim |
| 3 | flagsmith.com | 67.9% 95% CI 49.3–82.1% 19 mentions · avg pos 2.5 first pick 26.3% | — | GEMINI 85.7%CHATGPT 71.4%CLAUDE 42.9%PERPLEXITY 71.4% | Claim |
| 4 | flipt.io | 42.9% 95% CI 26.5–60.9% 12 mentions · avg pos 3.6 first pick 8.3% | — | GEMINI 57.1%CHATGPT 42.9%CLAUDE 28.6%PERPLEXITY 42.9% | Claim |
| 5 | gofeatureflag.io | 39.3% 95% CI 23.6–57.6% 11 mentions · avg pos 6.6 first pick 9.1% | — | GEMINI 71.4%CHATGPT 28.6%CLAUDE 14.3%PERPLEXITY 42.9% | Claim |
| 6 | kubernetes.io | 35.7% 95% CI 20.7–54.2% 10 mentions · avg pos 3 first pick 40% | — | GEMINI 71.4%CHATGPT 42.9%PERPLEXITY 28.6% | Claim |
| 7 | openfeature.dev | 28.6% 95% CI 15.3–47.1% 8 mentions · avg pos 5.7 first pick 12.5% | — | GEMINI 71.4%CHATGPT 28.6%CLAUDE 14.3% | Claim |
Features: enable, disable or change the behavior of certain features or code paths ↗ source · verified Sep 5, 2026 | |||||
| 8 | postgresql.org | 21.4% 95% CI 10.2–39.5% 6 mentions · avg pos 5.3 first pick 50% | — | GEMINI 42.9%CLAUDE 42.9% | Claim |
| 9 | posthog.com | 21.4% 95% CI 10.2–39.5% 6 mentions · avg pos 8.3 first pick 0% | — | GEMINI 57.1%CHATGPT 14.3%CLAUDE 14.3% | Claim |
| 10 | featbit.co | 14.3% 95% CI 5.7–31.5% 4 mentions · avg pos 4.5 first pick 0% | — | GEMINI 42.9%PERPLEXITY 14.3% | Claim |
| 11 | docker.com | 10.7% 95% CI 3.7–27.2% 3 mentions · avg pos 2 first pick 0% | — | GEMINI 14.3%CHATGPT 14.3%PERPLEXITY 14.3% | Claim |
| 12 | launchdarkly.com | 10.7% 95% CI 3.7–27.2% 3 mentions · avg pos 5 first pick 0% | — | CHATGPT 28.6%PERPLEXITY 14.3% | Claim |
| 13 | redis.io | 10.7% 95% CI 3.7–27.2% 3 mentions · avg pos 9 first pick 0% | — | GEMINI 28.6%PERPLEXITY 14.3% | Claim |
| 14 | mongodb.com | 10.7% 95% CI 3.7–27.2% 3 mentions · avg pos 10 first pick 0% | — | CLAUDE 28.6%PERPLEXITY 14.3% | Claim |
| 15 | servicenow.com | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 2 first pick 50% | — | CLAUDE 28.6% | Claim |
| 16 | react.dev | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 4 first pick 50% | — | GEMINI 28.6% | Claim |
| 17 | aws.amazon.com | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 4.5 first pick 50% | — | GEMINI 28.6% | Claim |
| 18 | azure.microsoft.com | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 4.5 first pick 50% | — | GEMINI 28.6% | Claim |
| 19 | clickhouse.com | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 6 first pick 0% | — | GEMINI 28.6% | Claim |
| 20 | split.io | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 7.5 first pick 0% | — | CHATGPT 14.3%PERPLEXITY 14.3% | Claim |
| 21 | snowflake.com | 7.1% 95% CI 2–22.6% 2 mentions · avg pos 11.5 first pick 0% | — | GEMINI 28.6% | Claim |
| 22 | angular.io | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 1 first pick 100% | — | GEMINI 14.3% | Claim |
| 23 | configcat.com | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 3 first pick 0% | — | PERPLEXITY 14.3% | Claim |
| 24 | okta.com | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 6 first pick 0% | — | GEMINI 14.3% | Claim |
| 25 | flagd | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 6 first pick 0% | — | CHATGPT 14.3% | Claim |
| 26 | FF4J | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 7 first pick 0% | — | GEMINI 14.3% | Claim |
| 27 | ff4j.org | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 7 first pick 0% | — | GEMINI 14.3% | Claim |
| 28 | flippercloud.io | 3.6% 95% CI 0.6–17.7% 1 mentions · avg pos 8 first pick 0% | — | GEMINI 14.3% | Claim |
Reading the numbers: Share is a point estimate on 28 sampled answers, so each row also shows its 95% CI — the Wilson score interval around that share. When two products' intervals overlap, the gap between them isn't statistically meaningful at this sample size. First pick is the share of a product's recommending answers where it was named first, which separates “always mentioned” from “usually the top recommendation”. Full methodology.
Independence: Orbator customers are badged for disclosure. Customer status does not affect prompts, sampling, extraction, or ranking — see the methodology. Your product on this list? Claim it to see the prompts behind your rank and track it weekly.
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Head-to-head pages for products ranked in Open-source feature flag tools. Each one sets out sourced facts side by side, plus which product AI assistants recommend more, engine by engine.
Unleash was recommended in 81% of 42 sampled answers in the 4-week window to 2026-09-05, the highest share in the category. Its mention breakdown shows 20 runs recommended against 14 listed, with 6 context and 1 warned against. Engine spread runs from 100% of Claude's 7 answers and 100% of Grok's 7 answers down to 57.1% of Perplexity's 7 answers. Pricing is Pay-As-You-Go $75 a month with a free tier, last verified 2026-09-05.
Flagsmith was recommended in 73.8% of 42 sampled answers in the same window, with 20 runs recommended and 11 listed, plus 7 context and 1 warned against. It reached 100% of Grok's 7 answers at the high end and 42.9% of Claude's 7 answers at the low end. Start-Up pricing is $40 a month with a free tier, last verified 2026-09-05.
GrowthBook was recommended in 59.5% of 42 sampled answers, with 14 runs recommended and 11 listed. Claude and Perplexity both sat at 71.4% of their 7 answers; ChatGPT sat lowest at 50% of its 14 answers. Pro pricing is $40 a month with a free tier, last verified 2026-09-05.
Flipt was recommended in 52.4% of 42 sampled answers, split 11 recommended and 11 listed. Grok was highest at 85.7% of 7 answers, ChatGPT lowest at 35.7% of 14 answers. Flipt Pro is $200 a month with a free tier, last verified 2026-09-05.
GO Feature Flag was recommended in 45.2% of 42 sampled answers, with 10 runs recommended and 9 listed. Gemini and Grok both reached 71.4% of their 7 answers, while Claude gave it 14.3% of 7 answers.
Four of the five engines recommended the same product most among the top five. Unleash led for Claude across 7 answers, for Gemini across 7 answers, for Grok across 7 answers, and for ChatGPT across 14 answers. Perplexity was the exception, leading with Flagsmith across its 7 answers.
Flagsmith also carried the widest gap between engines. It was recommended in 42.9% of Claude's 7 answers and 100% of Grok's 7 answers, a spread of 57.1 points. A shortlist built on one engine's output would look different depending on which engine produced it, and for Flagsmith the difference is the largest measured in this category.
This is the first measured window on record for open-source feature flag tools. It runs from 2026-08-08 to 2026-09-05, 28 days, and covers 42 sampled answers across 5 engines. There is no prior window to compare against, so no entries, exits or share changes can be reported yet.
Unleash leads the window at 81% of 42 sampled answers, with Flagsmith at 73.8% and GrowthBook at 59.5% of the same 42. Flipt sits at 52.4% and GO Feature Flag at 45.2%. Unleash was also the first product recommended in 41.2% of the answers that recommended it, the highest first-recommendation rate among the top five. The next window will show whether these positions hold.
Every number on this page is measured from sampled answers, and those answers are kept. The archive holds dated excerpts of what each engine answered, never full answers. Read the answer archive for open-source feature flag tools to see the excerpts by date and engine, or view the ranking history to see what entered and left this ranking and when.
Across 28 sampled AI answers from 4 engines (Aug 20, 2026 to Sep 17, 2026), Unleash is recommended most often for open-source feature flag tools, appearing in 75% of recommendations, followed by GrowthBook (75%). This is a measurement of what AI assistants recommend, not an editorial verdict.
ChatGPT recommends Unleash most often for open-source feature flag tools. It appears as a recommendation in 71.4% of ChatGPT's sampled answers in this window (Aug 20, 2026 to Sep 17, 2026). Other engines answer differently. The per-engine breakdown in the ranking shows each one.
Orbator samples AI answers to buyer questions across 4 engines and counts how often each product is recommended. No product pays for placement. The open-source feature flag tools ranking is based on 28 answers in the current 4-week window (Aug 20, 2026 to Sep 17, 2026). Full methodology is published at https://www.orbator.io/ai-index/methodology.
Verified facts for the most-recommended products — each sourced and dated. No editorial scoring, just the data side by side.
| Unleashgetunleash.io | GrowthBookgrowthbook.io | Flagsmithflagsmith.com | Fliptflipt.io | Kuberneteskubernetes.io | |
|---|---|---|---|---|---|
| Pricing | Pay-As-You-Go: $75 a month (free tier available) ↗ sourceverified Sep 5, 2026 | Pro: $40 a month (free tier available) ↗ sourceverified Sep 5, 2026 | Start-Up: $40 a month (free tier available) ↗ sourceverified Sep 5, 2026 | Flipt Pro: $200 a month (free tier available) ↗ sourceverified Sep 5, 2026 | — |
| Features | Feature flags ↗ sourceverified Sep 5, 2026 | Sequential testing ↗ sourceverified Sep 5, 2026 | Feature Flags & Remote Config ↗ sourceverified Sep 5, 2026 | Git-native workflows ↗ sourceverified Sep 5, 2026 | Automated rollouts and rollbacks ↗ sourceverified Sep 5, 2026 |
| Platforms | Docker ↗ sourceverified Sep 5, 2026 | Web ↗ sourceverified Sep 5, 2026 | Web ↗ sourceverified Sep 5, 2026 | REST APIs ↗ sourceverified Sep 5, 2026 | — |
| Integrations | AWS Kiro ↗ sourceverified Sep 5, 2026 | Slack ↗ sourceverified Sep 5, 2026 | Slack ↗ sourceverified Sep 5, 2026 | GitHub ↗ sourceverified Sep 5, 2026 | — |
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