Ryan Feigenbaum
@ryanfeigenbaum.com
Developer Advocate at GrowthBook. Web dev & design enthusiast. 🌮🥃☕🐩🏞️📸🛠️
Down with the slickness
The slickness!
At first, I thought I could just rotate the hue of HSL colors and call it a day. Since then, I've learned about perceptual color spaces, OKLCH, Bezold-Brücke effect and I still can't always get good programmatic palettes 😅
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
November 19, 2025 at 3:46 AM
Down with the slickness
Reposted by Ryan Feigenbaum
This is unbelievably good on so many levels.
Wondering if I might ask what it uses to do the conversions. Culori?
Wondering if I might ask what it uses to do the conversions. Culori?
November 18, 2025 at 9:29 PM
This is unbelievably good on so many levels.
Wondering if I might ask what it uses to do the conversions. Culori?
Wondering if I might ask what it uses to do the conversions. Culori?
At #JSNationUS, so find me if you wanna chat about feature flags, experimentation, bourbon, philosophy, dogs, tacos, piano, home improvement, or colors.
November 17, 2025 at 2:38 PM
At #JSNationUS, so find me if you wanna chat about feature flags, experimentation, bourbon, philosophy, dogs, tacos, piano, home improvement, or colors.
At first, I thought I could just rotate the hue of HSL colors and call it a day. Since then, I've learned about perceptual color spaces, OKLCH, Bezold-Brücke effect and I still can't always get good programmatic palettes 😅
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
Color Palette Pro — A Synthesizer for Color Palettes
Generate customizable color palettes in advanced color spaces that can be easily shared, downloaded, or exported.
colorpalette.pro
October 8, 2025 at 1:06 AM
At first, I thought I could just rotate the hue of HSL colors and call it a day. Since then, I've learned about perceptual color spaces, OKLCH, Bezold-Brücke effect and I still can't always get good programmatic palettes 😅
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
But I built Color Palette Pro to help get us halfway there: colorpalette.pro
Reposted by Ryan Feigenbaum
Graham and Ryan demo all the new AI-powered features recently released in GrowthBook.
The best part? Every AI prompt is fully customizable. Want results in haikus? Different language? Your company's tone of voice? You control it all.
youtu.be/jhyGxknbGk0
The best part? Every AI prompt is fully customizable. Want results in haikus? Different language? Your company's tone of voice? You control it all.
youtu.be/jhyGxknbGk0
Introducing GrowthBook AI: 6 New Features for Smarter Experimentation
Discover how GrowthBook is revolutionizing A/B testing and experimentation with powerful AI features! In this demo, GrowthBook CEO Graham and Developer Advocate Ryan showcase the latest AI-powered…
youtu.be
August 18, 2025 at 7:14 PM
Graham and Ryan demo all the new AI-powered features recently released in GrowthBook.
The best part? Every AI prompt is fully customizable. Want results in haikus? Different language? Your company's tone of voice? You control it all.
youtu.be/jhyGxknbGk0
The best part? Every AI prompt is fully customizable. Want results in haikus? Different language? Your company's tone of voice? You control it all.
youtu.be/jhyGxknbGk0
Does Your Website Even Have an iPod?
And is the PonoPlayer next?
ryanfeigenbaum.com
August 18, 2025 at 2:40 PM
Can't believe it's been 10 years since Carrie & Lowell. I resonate with this, I think: "I find as I get older, experience makes fools of us all—I feel kind of stupider and less prepared for what life brings me in a lot of ways.... I'm just becoming more zen" www.npr.org/2025/05/27/1...
10 years later, Sufjan Stevens offers a startling reevaluation of 'Carrie & Lowell' : All Songs Considered
In a conversation with All Songs Considered's Robin Hilton, Stevens shares a complex and conflicted view of the album he wrote about his mother in the wake of her death from cancer.Enjoy the show? Sha...
www.npr.org
May 30, 2025 at 3:00 PM
Can't believe it's been 10 years since Carrie & Lowell. I resonate with this, I think: "I find as I get older, experience makes fools of us all—I feel kind of stupider and less prepared for what life brings me in a lot of ways.... I'm just becoming more zen" www.npr.org/2025/05/27/1...
I got tired of manually figuring out `sizes` attributes for responsive images, so I built a CLI tool to do it automatically 🤖 ryanfeigenbaum.com/size-your-im...
Size Your Images Perfectly with This Tool
Stop guessing at sizes attribute values and letting performance optimizations slip by. Size Writer measures your images across viewports and generates the exact sizes values you need.
ryanfeigenbaum.com
May 24, 2025 at 7:19 PM
I got tired of manually figuring out `sizes` attributes for responsive images, so I built a CLI tool to do it automatically 🤖 ryanfeigenbaum.com/size-your-im...
I built an MCP Server for GrowthBook ✨ it's early days, but the possibilities are incredible.
Curious about Model Context Protocol (MCP)? Michael and Ryan demo our official MCP Server, showing how you can use it to create flags, force rules, remove stale rollouts, and more, right from VS Code, Cursor, or your fave AI tool.
youtu.be/y-1SOdHZIEA?...
youtu.be/y-1SOdHZIEA?...
Add Feature Flags from Your Editor?! GrowthBook’s MCP Server in Action
In this video, we walk through GrowthBook’s new MCP Server—the first implementation built specifically for feature flagging and experimentation.Using AI tool...
youtu.be
May 22, 2025 at 1:52 AM
I built an MCP Server for GrowthBook ✨ it's early days, but the possibilities are incredible.
This MCP Server is truly useful and makes feature flag management so much easier.
Ever wanted to create a feature flag by asking your editor?
Now you can. GrowthBook's new open source #MCP Server connects Claude, Cursor, and other AI tools to your flags and experiments.
First of its kind in the experimentation space.
🔗 blog.growthbook.io/introducing-...
Now you can. GrowthBook's new open source #MCP Server connects Claude, Cursor, and other AI tools to your flags and experiments.
First of its kind in the experimentation space.
🔗 blog.growthbook.io/introducing-...
Introducing the First MCP Server for Experimentation and Feature Management
The official GrowthBook MCP Server lets you create feature flags, review experiments, and more right from your favorite AI tool.
blog.growthbook.io
May 20, 2025 at 1:10 PM
This MCP Server is truly useful and makes feature flag management so much easier.
Reposted by Ryan Feigenbaum
How do you know your feature actually works in prod? Use Safe Rollouts to catch regressions early, letting you ship faster and more confidently 💪
May 5, 2025 at 11:53 AM
How do you know your feature actually works in prod? Use Safe Rollouts to catch regressions early, letting you ship faster and more confidently 💪
Reposted by Ryan Feigenbaum
Some days, experiments can't be clearer: ship, ship, ship. Other days, though, they don't give you a clear answer. They give you context, nuance, trade-offs. Our Experiment Decision Framework (EDF) helps cut through the noise, so you can make a more confident decision.
Here's how it works 🧵
Here's how it works 🧵
May 14, 2025 at 10:54 PM
Some days, experiments can't be clearer: ship, ship, ship. Other days, though, they don't give you a clear answer. They give you context, nuance, trade-offs. Our Experiment Decision Framework (EDF) helps cut through the noise, so you can make a more confident decision.
Here's how it works 🧵
Here's how it works 🧵
Reposted by Ryan Feigenbaum
May 4, 2025 at 1:27 PM
Reposted by Ryan Feigenbaum
GrowthBook 3.6 is live
- Safe Rollouts for metric-guarded launches
- Time Series View in experiment results
- Official Jira Integration to keep the PMs happy
- Decision Framer Events/API for custom workflows
- Dev Tools for SSR apps (yep, backend friendly now)
- JSON column support in Fact Tables
- Safe Rollouts for metric-guarded launches
- Time Series View in experiment results
- Official Jira Integration to keep the PMs happy
- Decision Framer Events/API for custom workflows
- Dev Tools for SSR apps (yep, backend friendly now)
- JSON column support in Fact Tables
May 2, 2025 at 12:41 PM
GrowthBook 3.6 is live
- Safe Rollouts for metric-guarded launches
- Time Series View in experiment results
- Official Jira Integration to keep the PMs happy
- Decision Framer Events/API for custom workflows
- Dev Tools for SSR apps (yep, backend friendly now)
- JSON column support in Fact Tables
- Safe Rollouts for metric-guarded launches
- Time Series View in experiment results
- Official Jira Integration to keep the PMs happy
- Decision Framer Events/API for custom workflows
- Dev Tools for SSR apps (yep, backend friendly now)
- JSON column support in Fact Tables
Reposted by Ryan Feigenbaum
Are you teaching to the test? Breeding cobras? Letting the measure become the target?
Goodhart's Law reminds us, "When a measure becomes a target, it ceases to be a good measure."
This comes up all the time in A/B testing and experimentation.
Goodhart's Law reminds us, "When a measure becomes a target, it ceases to be a good measure."
This comes up all the time in A/B testing and experimentation.
April 25, 2025 at 8:04 AM
Are you teaching to the test? Breeding cobras? Letting the measure become the target?
Goodhart's Law reminds us, "When a measure becomes a target, it ceases to be a good measure."
This comes up all the time in A/B testing and experimentation.
Goodhart's Law reminds us, "When a measure becomes a target, it ceases to be a good measure."
This comes up all the time in A/B testing and experimentation.
Who wore it better? Frank or Mel?
April 16, 2025 at 4:56 PM
Who wore it better? Frank or Mel?
Reposted by Ryan Feigenbaum
I’m super excited about `text-wrap: pretty`. It does a lot more to improve typography than you might expect — at least in Safari Technology Preview 216.
It improves all lines of text, not just the last 4. It enhances hyphenation & rag, not just avoiding short last lines.
webkit.org/blog/16547/b...
It improves all lines of text, not just the last 4. It enhances hyphenation & rag, not just avoiding short last lines.
webkit.org/blog/16547/b...
Better typography with text-wrap pretty
Support for text-wrap: pretty just shipped in Safari Technology Preview, bringing an unprecedented level of polish to typography on the web.
webkit.org
April 8, 2025 at 2:33 PM
I’m super excited about `text-wrap: pretty`. It does a lot more to improve typography than you might expect — at least in Safari Technology Preview 216.
It improves all lines of text, not just the last 4. It enhances hyphenation & rag, not just avoiding short last lines.
webkit.org/blog/16547/b...
It improves all lines of text, not just the last 4. It enhances hyphenation & rag, not just avoiding short last lines.
webkit.org/blog/16547/b...
I'm speaking today at #KubeCon London, as part of the #OpenFeature summit. Come hear my talk, Beyond Boolean, where I discuss some of the challenges teams face when flagging at scale and how we help you solve those problems at @growthbook.io
April 1, 2025 at 8:42 AM
I'm speaking today at #KubeCon London, as part of the #OpenFeature summit. Come hear my talk, Beyond Boolean, where I discuss some of the challenges teams face when flagging at scale and how we help you solve those problems at @growthbook.io
This meeting could've been an email. And that email could've been a slack message. And that slack message could've been whispered quietly into a well.
March 26, 2025 at 3:44 PM
This meeting could've been an email. And that email could've been a slack message. And that slack message could've been whispered quietly into a well.
Shareception! The share button I built, in action on my website, being used to share a blurb about the share button.
ryanfeigenbaum.com/share-this-s... #webcomponents
ryanfeigenbaum.com/share-this-s... #webcomponents
March 18, 2025 at 1:11 PM
Shareception! The share button I built, in action on my website, being used to share a blurb about the share button.
ryanfeigenbaum.com/share-this-s... #webcomponents
ryanfeigenbaum.com/share-this-s... #webcomponents
Reposted by Ryan Feigenbaum
Our Dev Tools have been completely revamped for easier debugging and testing of feature flags and experiments. The update simplifies understanding user assignments to specific variations and is now available on both Chrome and Firefox! 🛠️
March 8, 2025 at 9:04 AM
Our Dev Tools have been completely revamped for easier debugging and testing of feature flags and experiments. The update simplifies understanding user assignments to specific variations and is now available on both Chrome and Firefox! 🛠️
Reposted by Ryan Feigenbaum
The first Senators to actually do anything about the Trump admin
NEW - Ottawa Senators fans booed the American national anthem at the beginning of tonight’s hockey game.
February 2, 2025 at 1:07 AM
The first Senators to actually do anything about the Trump admin
Reposted by Ryan Feigenbaum
Reposted by Ryan Feigenbaum
Yes, this administration is dangerous and cruel, but they are also shockingly dim and incompetent.
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
January 30, 2025 at 2:35 AM
Yes, this administration is dangerous and cruel, but they are also shockingly dim and incompetent.
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
Reposted by Ryan Feigenbaum
Stop compromising between customization & convenience. With Custom Fields and Pre-Launch Checklists, you get all the power of a totally bespoke experimentation platform—without having to build it yourself
January 17, 2025 at 3:14 PM
Stop compromising between customization & convenience. With Custom Fields and Pre-Launch Checklists, you get all the power of a totally bespoke experimentation platform—without having to build it yourself