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Comparison · Infra & APIs
cofad vs volcalc
A side-by-side editorial comparison of cofad and volcalc — release velocity, themes, recent moves, and the top alternatives to consider.
cofad vs volcalc: at a glance
What is cofad?
Contrast analysis with a Shiny front end, shipping about one release a year
cofad performs contrast analyses for factorial designs in both between- and within-subject forms, and ships a Shiny GUI alongside the R interface. The 0.3.0 release in 2024 was the substantial one: a helper for calculating differences between two sets of lambdas for competing contrast analysis, improved summary output, removal of the plyr dependency, a rebuilt Shiny interface using standard elements after the sortable drag-and-drop proved unstable, and a change of maintainer to Johannes Titz. The most recent release is a one-line patch fixing degrees of freedom in the t-test table.
What is volcalc?
Rebuilt itself around SMILES and .mol input, then made the chemistry configurable
volcalc estimates the volatility of chemical compounds from their structure, implementing the SIMPOL.1 group-contribution method and the Meredith et al. variant. Version 2.0.0 severed the package from KEGG: calc_vol() takes .mol file paths or SMILES strings directly, is vectorized over multiple compounds, and the group-contribution maths was split into its own simpol1() function. Work since has been chemistry accuracy and configurability — the full set of SIMPOL.1 functional groups, volatility thresholds for clean atmosphere, polluted atmosphere or soil, user-supplied temperature, and a validate option returning NA when structure parsing looks suspect.
cofad vs volcalc: editorial side-by-side
cofad
0.0INFRA · APIS
Contrast analysis with a Shiny front end, shipping about one release a year
◆ Current state
cofad performs contrast analyses for factorial designs in both between- and within-subject forms, and ships a Shiny GUI alongside the R interface. The 0.3.0 release in 2024 was the substantial one: a helper for calculating differences between two sets of lambdas for competing contrast analysis, improved summary output, removal of the plyr dependency, a rebuilt Shiny interface using standard elements after the sortable drag-and-drop proved unstable, and a change of maintainer to Johannes Titz. The most recent release is a one-line patch fixing degrees of freedom in the t-test table.
◆ Where it's heading
Development is slow and correctness-led. The record runs from a JOSS publication in 2021 through a near three-year gap to a release that both extended the method and repaired the GUI, then a degrees-of-freedom fix. Maintainer and author order changed in 0.3.0, which typically marks a handover rather than a burst of new work, and the cadence since is consistent with that.
◆ Prediction
Expect low-frequency correctness releases; the competing contrast analysis helper added in 0.3.0 is the most likely thing to be extended if anything is.
volcalc
0.0INFRA · APIS
Rebuilt itself around SMILES and .mol input, then made the chemistry configurable
◆ Current state
volcalc estimates the volatility of chemical compounds from their structure, implementing the SIMPOL.1 group-contribution method and the Meredith et al. variant. Version 2.0.0 severed the package from KEGG: calc_vol() takes .mol file paths or SMILES strings directly, is vectorized over multiple compounds, and the group-contribution maths was split into its own simpol1() function. Work since has been chemistry accuracy and configurability — the full set of SIMPOL.1 functional groups, volatility thresholds for clean atmosphere, polluted atmosphere or soil, user-supplied temperature, and a validate option returning NA when structure parsing looks suspect.
◆ Where it's heading
The arc runs from a script tied to one database toward a general structure-to-volatility tool. Dropping KEGG from the core in 2.0.0, then removing KEGGREST as a dependency entirely in 2.2.0, took the package from volatility for KEGG compounds to volatility for any structure a user can supply. The accompanying manuscript published in 2023, and the changelog since has been careful about coefficient double-counting — amines and amides have each been corrected — which suggests the group definitions are the part under active scrutiny.
◆ Prediction
The smarts_simpol1 dataset added in 2.2.0 documents how functional groups are defined, pointing toward further estimation methods alongside SIMPOL.1 and Meredith; splitting simpol1() out in 2.0.0 was stated to be groundwork for exactly that.
Alternatives to cofad and volcalc
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either cofad or volcalc.
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See all cofad alternatives → · See all volcalc alternatives →
Recent activity from cofad and volcalc
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1y agocofadDegrees of freedom corrected in the t-test table
- 1y agovolcalcParsing validation, user-supplied temperature, KEGGREST dropped
- 2y agocofadCompeting contrast helper, rebuilt Shiny GUI, maintainer change
- 2y agovolcalcAuthorship and citation updates
- 2y agovolcalcSMILES input, environment-specific thresholds, missing functional groups
- 2y agovolcalcRebuilt around .mol and SMILES input; SIMPOL.1 split into simpol1() ⚡
- 3y agovolcalcAmines group removed to stop double-counting with primary amines
- 3y agovolcalcbug fix: standard temperature
- 4y agocofadDocumentation and references for JOSS publication
- 4y agocofadShiny GUI added; aggregated-data function and 0-variance fix
Frequently asked questions
What is the difference between cofad and volcalc?
They serve adjacent needs but don't currently overlap on shipped themes. cofad and volcalc are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is cofad better than volcalc?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. cofad and volcalc are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to cofad?
Top cofad alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "cofad alternatives" section above for the current picks, or visit /alternatives/cofad for the full list with editorial commentary on each.
What are the best alternatives to volcalc?
Top volcalc alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "volcalc alternatives" section above for the current picks, or visit /alternatives/volcalc for the full list with editorial commentary on each.