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C4B
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C4B vs Ladybug Tools

C4B vs Ladybug Tools

Ladybug Tools is a free, widely used set of Grasshopper plugins for parametric environmental analysis in Rhino; its website reports more than 500,000 downloads. C4B answers the early site-climate questions in the browser, with no modelling software, scripting or weather files.

Last checked13 October 2026

C4B and Ladybug Tools at a glance

AspectC4BLadybug Tools
TypeWeb app, in the browserPlugins for Grasshopper (Rhino), open source; paid Pollination plugins and cloud
PriceFree plan; paid plans from €59/month (cancellation takes effect after 12 billing cycles) or €599/year, with a 7-day free trialFree plugins; requires Rhino (a commercial licence is sold separately)
Choosing the locationSearch an address or click the map; no weather file neededImport an EPW file, or download one with the EPWmap and Download Weather components
Weather dataNearest weather station file (Climate.OneBuilding.Org, usually TMYx) plus, in projects, EPW files built from site-specific reanalysis (ERA5 / ERA5-Land, CERRA, NORA3) at the exact coordinatesEPW weather files, typically from Climate.OneBuilding.Org or uploaded by you; some plugins generate an EPW from a dataset you provide
PrecipitationMonthly totals and rain event intensity from NOAA rain gauges near the site; in projects, site-specific reanalysis at the exact coordinates and a rainfall record from 1941Not provided
Future climateSSP1-1.9 to SSP5-8.5, any year from 2025 to 2100, in projects on paid plansNo future-climate morphing component in the primer index; use a future EPW from another tool
Outdoor comfortUTCI outdoor comfort, including on the Free planUTCI, PET, PMV and adaptive comfort components
Passive design strategies (indoor)Passive Design Strategies for Indoor Environments, with seven strategies per bioclimatic method, in projects on paid plans; the chart with the strategy zones drawn on it in the Designer module on Technical and EnterprisePsychrometric chart with five passive strategy polygons and the share of hours in each, via the PMV Polygon component
Energy analysisPreliminary hourly energy balance; orientation and aspect-ratio optimization and window shading recommendations (five fixed devices on eight facades) in projects on paid plansDetailed energy and daylight simulation through Honeybee
Design directionIndoor passive design strategies, outdoor comfort strategies, building orientation and aspect ratio, PV panel orientation and window shading recommendations, in projects on paid plansNot provided
Accessibility of outputGraphics and data interpretation are targeted at laypeople, and can be read by architects and building developers, in addition to more technical personnelAll output requires extensive manipulation within Ladybug or Rhino to develop presentable material
OutputsInteractive charts; written readings on most charts in projects and a PDF report on paid plans; EPW downloads on Technical and EnterpriseRhino and Grasshopper graphics, data and simulation files

Where Ladybug Tools is strong

  • Free and open source, with an active user forum, tutorials and example files; its website reports more than 500,000 downloads.
  • Parametric, geometry-linked analyses such as radiation, sun hours and UTCI maps on your own model.
  • Plots a psychrometric chart with five passive strategy polygons - evaporative cooling, mass with night ventilation, use of fans, capture of internal heat and passive solar heating - and reports the share of hours inside each.
  • Connects to validated engines for detailed daylight and energy simulation through Honeybee.

Where C4B takes a different approach

  • Runs in a browser, with no Rhino licence, plugin install or visual scripting.
  • Starts from an address or map point; C4B finds the station file and, in projects, compiles site-specific weather data from reanalysis.
  • Delivers a finished set of analyses (with written readings and a PDF report in projects on paid plans), rather than components to assemble your own workflow.
  • Includes future climate scenarios and Köppen-Geiger climate zone projections to 2100.

Ladybug Tools may suit you better if

  • You work in Rhino and Grasshopper and want analyses linked to your geometry.
  • You need detailed energy or daylight simulation.
  • You want full control to build custom parametric workflows.
  • You want to tune the passive strategy polygons yourself, from air speed to the thermal-mass and night-flush limits.

C4B may suit you better if

  • You want the site climate brief before any geometry exists.
  • Not everyone on the team uses Rhino or scripts.
  • You need site-specific data, future climate and a readable report without assembling them yourself.

See your site's climate before design begins

Pin any location and get climate, comfort and preliminary energy insight your whole team can read. Start with a 7-day free trial, or book a 30-minute demo.

Free plan; paid plans from €59/month (cancellation takes effect after 12 billing cycles) or €599/year, with a 7-day free trial. No card required. If you add a card during the trial, the plan is charged when the trial ends; otherwise your account moves to the Free plan. See all plans.

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Frequently asked questions

Do I need Rhino or Grasshopper to use C4B?

No. C4B runs in a web browser. You search for an address or click on a map.

Is C4B a replacement for Ladybug Tools?

Not for geometry-based or detailed simulation work. C4B covers the early site-climate analysis; Ladybug Tools and Honeybee go deeper into design-specific studies. A quick C4B site brief can come before that modelling.

Can I use C4B weather files in Ladybug?

Yes. EPW downloads are available on C4B's Technical and Enterprise plans, and these files can be imported for use in Ladybug scripts and analyses. C4B's custom EPW builder can give you site-, project- and timeline-specific EPW files that may be hard to generate elsewhere.

Sources

Information about Ladybug Tools comes from its official website and documentation, checked on 13 October 2026. Products change, so check the official site for the latest details. Ladybug Tools belongs to Ladybug Tools LLC; C4B is not affiliated with or endorsed by them.

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