Hoparoma Get App

From recipe chemistry
to finished aroma.

Hoparoma calculates the hop, yeast, and malt aroma compounds in your recipe — grounded in published research — and derives your IPA's aroma and character, down to its tropical thiols, before you brew.

Download on the App Store Open in your browser
The web calculator is free for 3 recipes a month, on any device. NEW IN 2.0 · On-device AI · Flavor Forecast + co-pilot AI features need iOS 26 on a supported iPhone.
Free reference library

The data behind the forecast, open to everyone

Supplier brewing values, bound-thiol ratings, crop-year lots, and the yeast and malt tables Hoparoma runs on. Sourced, machine-readable, no sign-up.

70 hop varieties Oils, thiol potential, crop-year lots Alpha, oil composition, 3MH and 4MMP precursor tiers, and lot certificates for 15 core varieties across 2024 to 2026. Browse hops 29 yeast strains Rated for thiol release A three-step β-lyase rating for every strain, with the manufacturer trials and papers behind the thiol-forward ones. Browse yeast 40 malts and grains Thiol precursor levels Which grains carry bound 3MH precursors, which kilning destroys them, and the three papers that measured it. See the malt table
The Hoparoma aroma forecast radar from a real device, plotting a recipe across seven aroma axes — Citrus, Tropical, Floral, Herbal, Spicy, Resin/Pine and Dank/Earthy — with the modelled profile drawn as a filled green polygon

See where your recipe lands — before you brew it

From your hops, malt, and yeast, Hoparoma computes the aroma-compound levels your recipe will produce — then plots the finished profile across seven sensory axes. A research-based read on how it will turn out, before brew day.

Thiol Forecast — the 4-axis thiol model

Most brewing apps tell you what hops to use. Hoparoma computes what your recipe is likely to smell like before you brew it, by combining four ingredient layers into one science-honest forecast.

01

YEAST

29 strains · β-lyase level rated

Cosmic Punch, Helio Gazer, WLP077 Tropicale, Thiol Libre, Pomona, London III and Conan lineages. Every strain is rated low, medium, or high for the enzyme that frees bound thiols. See the yeast table.

02

HOP

70 varieties · bound thiol precursors rated

Galaxy, Nelson Sauvin, Citra, Mosaic, and Riwaka rate high for 3MH-family or 4MMP precursors; Cascade and the noble hops rate low. Ratings draw on supplier data and published thiol research. Browse the hop library.

03

MALT

40 malts and grains · thiol precursor level rated

Hoparoma models malt's thiol contribution — the layer most apps leave out. Pale barley malt carries bound 3MH precursor in the hundreds of µg/kg; roasting destroys it; wheat, oat, and rye carry little. See the malt table.

04

+ THIOL BOOSTER

Phantasm Powder · Propper Phantasm · future products

Additive amplification of the core 3 axes, normalized to dose per batch volume. Future-proof naming for upcoming booster products such as Tropics Boost and Apex Amplify.

Sample Thiol Forecast radar chart Four-axis radar visualizing a sample Hoparoma recipe: yeast 0.65, hop 0.85, malt 0.72, booster 0.45, total 0.78. TROPICAL THIOL · TOTAL 0.78 YEAST 0.65 HOP 0.85 MALT 0.72 + BOOSTER 0.45
SAMPLE · Mindful Hazy Session IPA Cosmic Punch · Citra + Mosaic · Pale 2-row · 1.0 oz Phantasm

Research basis

Built on peer-reviewed thiol and hop-aroma research (Chenot et al. 2019–2023, Roland et al. 2016–2017, Fleischer & Hellwig 2022, Molitor et al. 2022, Lafontaine & Shellhammer 2018) and on supplier lot data. Most recipe apps model hop chemistry alone; Hoparoma models yeast × hop × malt × adjunct together, and publishes the data it runs on. Full source list.

New in 2.0 · Apple Intelligence

Your forecast, in words —
and a co-pilot that tunes it.

2.0 adds on-device AI, powered by Apple Intelligence. It reads the same 4-axis forecast and turns it into a tasting note you can actually read — then helps you steer the recipe toward the beer you're after.

Flavor Forecast

Reads your recipe. Writes the tasting note.

Apple Intelligence turns your predicted profile into a short, plain-language tasting note — the headline aroma, what sits underneath, and the finish. Generated entirely on device.

Sample output

Pillowy passionfruit over soft citrus

Galaxy and Citra push tropical thiols to the front, while a β-lyase yeast keeps the haze juicy rather than sharp.

Finish — clean, lightly dank, low bitterness.

AI co-pilot

Tell it the beer you want. It steers the recipe.

Say "more tropical, but not too bitter." The co-pilot reads your current build and proposes options — but every number comes from Hoparoma's prediction engine, not the language model. Each option shows a before/after radar and an honest trade-off.

  • More tropical
  • Raise the ABV
  • Like a West Coast IPA

Free · 5 AI sessions  |  Pro · unlimited

The Hoparoma AI co-pilot on iPhone: a What are you after prompt with the goal More tropical, then a proposed option to boost an existing hop, shown with a before/after aroma radar, the exact change (set Galaxy to 125g), and an honest trade-off.
The co-pilot, on device — goal in, options out, every number from the engine.

Flavor Forecast and the AI co-pilot run on Apple Intelligence and need iOS 26 on a supported iPhone. On other devices Hoparoma tells you plainly — and the full 4-axis forecast still works everywhere.

Mindful Recipe Presets

Designed with the Thiol Forecast in mind. Low ABV, full thiol expression.

Mindful Hazy Session IPA

4.2% ABV · Cosmic Punch + Citra + Mosaic + 1.0 oz Phantasm

Thiol Forecast: 0.76 · high

Low-ABV hazy that doesn't sacrifice tropical aroma. Phantasm slider tunes intensity from 0.5 to 2.5 g/L.

Sober-Curious Session Pale

3.8% ABV · LalBrew New England + Galaxy + Nelson Sauvin

Thiol Forecast: 0.74 · high

Sub-4% pale ale built around thiol-rich Southern Hemisphere hops and a thiol-positive yeast strain.

Lot-level crop year data

Three libraries, one forecast

Every hop, yeast, and malt is rated for its thiol contribution — the data layer the forecast is built on.

Hops

70 varieties · 15 with lot-level crop year data

Bound thiol precursors rated for every variety. Hoparoma includes lot-level crop year data for 15 core varieties — each carries real 2024, 2025, and 2026 analytical lots (alpha acid, total oil, oil composition) you can switch between, so the radar reflects the exact crop you brewed with. Other varieties fall back to 4-year aggregate ranges.

Rated high for bound thiol precursors

Citra Galaxy Nelson Sauvin Mosaic Riwaka Strata Simcoe All 70 varieties

Lot-level crop year data shifts oil and alpha values year over year. Mash-hop additions bank extra thiol precursors that a β-lyase yeast develops during fermentation.

Yeast

29 strains · table and evidence

Every yeast rated low, medium, or high for thiol release. Availability badges tell you what you can actually source — from homebrew packs to pro-pitch-only strains.

  • Mainstream 11 g / 500 g dry packs or PurePitch / pouch
  • Limited Homebrew packs phased out, active in 0.5 hL pro pitch
  • Pro Pitch Only 0.5 hL or 1 BBL, recommended for craft breweries

Malt

40 malts and grains · precursor table

Models malt's thiol contribution — the layer most apps leave out. Pale barley malt carries bound 3MH precursor in the hundreds of µg/kg, while roasted malts are thermally degraded to near zero. Rated from peer-reviewed measurements, listed with sources.

NATIVE SWIFTUI · iOS 26 LIQUID GLASS

Apple Native by Design

Built natively in SwiftUI for iPhone and iPad — with Apple's latest design language and a strict on-device privacy model.

  • Built in SwiftUI

    100% native — no web views, no cross-platform wrapper.

  • Liquid Glass on iOS 26

    Apple's Liquid Glass refraction, with a clean fallback to iOS 17.

  • iPhone & iPad

    One universal app. The radar and builder reflow for the larger screen.

  • Local-first privacy

    All on device. No account, no sign-in, no tracking.

Designed in Tokyo

Modern IPAs amaze me every time I drink one — passion fruit and citrus, pillowy, full of surprise. But when I tried to brew like them myself, I never got close.

Hoparoma started in Tokyo with the hunch that real scientific analysis might finally close the gap. The radar chart visualizes your beer's character at a glance, and underneath, years of peer-reviewed research drive every calculation. Aroma compounds are quantified, not guessed.

Save a recipe, log how it actually brewed, refine it again. Over time you build a beer that's truly your own — guided by chemistry, not guesswork.

Pricing

Transparent, indie pricing. Use Hoparoma free with up to 2 saved recipes — or unlock the full 4-axis engine.

These are the iOS app's prices, billed through the App Store. On the web, Free covers 3 recipes a month and Pro is US$4.99 a month plus applicable tax, billed through Stripe. One Pro subscription covers the app and the web on the same account. About the web calculator

  1. Free

    Core Thiol Forecast, basic recipe management, up to 2 saved recipes, and 5 AI co-pilot sessions to try.

    $0

  2. Pro Monthly

    Unlimited recipes, unlimited AI co-pilot, 4-axis advice, history compare.

    $5.99 /mo

  3. Pro Annual

    Best value for ongoing brewers · 7-day free trial.

    $39.99 /yr

Frequently asked

What's the science behind 4-axis prediction?

Peer-reviewed research from MDPI Fermentation (2022), Springer EFR&T (2022), DIAL UCL (2023), and PMC 9329171 (2024) establishes that barley malt holds up to 700 µg/kg of bound 3MH precursor, hops carry both free and bound thiols, and yeast's β-lyase enzyme is the gate that unlocks all of them.

Is there a web version?

Yes. The hop aroma calculator runs in any current browser, including Android and desktop, at app.hoparoma.com. Free covers 3 recipes a month, and one Pro subscription covers both the web and the app.

Is Hoparoma for homebrewers or craft brewers?

Both. The yeast and malt libraries include mainstream homebrew packs and pro-pitch-only strains for commercial breweries. Availability badges make it clear what you can source at your scale.

How does crop year data work?

Hoparoma includes lot-level crop year data for 15 core hop varieties. Each carries real 2024, 2025, and 2026 analytical lots — switching crop year updates alpha acid, total oil, and oil composition, and the forecast on the radar chart follows. Varieties without lot data use 4-year aggregate medians.

What does the Suggestion engine recommend?

The Suggestion engine surfaces in the Bento card after you compose a recipe. It analyzes your 4-axis thiol forecast and proposes 2–4 category-diverse next-batch tweaks — for example, "swap Citra for Galaxy to boost free thiol" or "Phantasm 1.0 → 1.5 g/L to amplify." Top 1 suggestion per category, so hops don't crowd out yeast, malt, or booster ideas.

Do I need a specific iPhone for the AI features?

Flavor Forecast and the AI co-pilot run on Apple Intelligence, which needs iOS 26 on a supported iPhone. Where it isn't available, Hoparoma says so plainly instead of hiding the button — and the full 4-axis Thiol Forecast, libraries, and tasting log work on every supported device, AI or not.