SciML/Catalyst.jl

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Chemical reaction network and systems biology interface for scientific machine learning (SciML). High performance, GPU-parallelized, and O(1) solvers in open source software.

Stars: 526
Forks: 82
Open beginner issues: 0
Indexed issues: 99
Avg merge: 12h 4m
Merged PRs (30d): 19

Dominant language: Julia
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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99 open issues indexed

Extension test environment setup writes read-only installed Project.toml on Julia 1.13 Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

SciML/Catalyst.jl#1561 · Opened Sep 13, 2026
CI: Tests (1, QA) kills the runner — JET 0.11 report_package peaks at 22 GB RSS on Julia 1.12 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/Catalyst.jl#1527 · 7 comments · Opened Aug 1, 2026
Master ReleaseTest (SciMLBase/MTK): Symbolic Stoichiometry UndefKeywordError parent_sys Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/Catalyst.jl#1524 · Opened Jul 23, 2026
Runic 1.7.0 reports 74 unformatted files on master Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

SciML/Catalyst.jl#1518 · Opened Jul 21, 2026
Re-enable the downgrade workflow Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

SciML/Catalyst.jl#1517 · Opened Jul 21, 2026
QA: track pre-existing Aqua/ExplicitImports findings marked @test_broken in test/qa Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

SciML/Catalyst.jl#1496 · Opened Jun 25, 2026
Algebraic equations/observables with HybridProblems Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/Catalyst.jl#1493 · 9 comments · Opened Jun 22, 2026
Using Tau-leaping Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/Catalyst.jl#1465 · 4 comments · 1 reaction · Opened Apr 23, 2026
microscopic ratelaw-based CLE Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/Catalyst.jl#1435 · Opened Mar 5, 2026
Tracking: Missing tutorials / documentation for v16 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/Catalyst.jl#1433 · 3 comments · Opened Mar 5, 2026
Support for continuous spatial models Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1424 · 6 comments · Opened Feb 23, 2026
Tracking: @test_broken tests audit and status Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

SciML/Catalyst.jl#1407 · 1 comment · Opened Feb 10, 2026
Expand unit checking Open

enhancement good first issue help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1400 · Opened Feb 9, 2026
Invalidation of nameof Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1399 · 6 comments · Opened Feb 9, 2026
[Post V16] Add more hybrid correctness tests for complicated systems Open

good first issue post_v16

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1373 · Opened Feb 4, 2026
`complete` swaps order of metadata in `ReactionSystem`s Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/Catalyst.jl#1353 · 3 comments · Opened Jan 16, 2026
On v16 version: `Latexify.@generate_test latexify(rs)` fails Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

SciML/Catalyst.jl#1352 · Opened Jan 15, 2026
Catalyst with units Open

question

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/Catalyst.jl#1341 · 9 comments · Opened Nov 21, 2025
Trouble with interacting components Open

question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1336 · 4 comments · Opened Nov 9, 2025
Imperative events in the DSL Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1335 · 8 comments · Opened Nov 9, 2025
ODEProblem creation is incorrect with NoSpecialize option. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

SciML/Catalyst.jl#1334 · 1 comment · Opened Nov 7, 2025
LoadError: AssertionError: @parameters expects a tuple of expressions or an expression of a tuple Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1331 · 2 comments · Opened Nov 5, 2025
Diffusion equation modelling Open

question

Difficulty 5/5 Over a week Newbie friendliness 30/100

SciML/Catalyst.jl#1323 · 4 comments · Opened Sep 16, 2025
add common mistakes documentation Open

good first issue

Difficulty 3/5 1-2 days Newbie friendliness 52/100

SciML/Catalyst.jl#1316 · Opened Aug 8, 2025
species that only appear within observables Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SciML/Catalyst.jl#1314 · 5 comments · Opened Aug 6, 2025
`@compartment`/`@subsystem`/similar option for the DSL Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

SciML/Catalyst.jl#1288 · Opened Jun 21, 2025
Feature Request: Add tools for degree of rate control (DRC) analysis Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/Catalyst.jl#1283 · 3 comments · Opened Jun 16, 2025
Better support for modular models Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

SciML/Catalyst.jl#1278 · 12 comments · Opened May 30, 2025
Remove `gensym` usage for better precompilation caching Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

SciML/Catalyst.jl#1266 · 3 comments · Opened May 13, 2025
New functionality planning Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

SciML/Catalyst.jl#1264 · 31 comments · Opened May 12, 2025
Create an introductory network analysis doc page Open

SciML/Catalyst.jl#1220 · 1 assignee · Opened Apr 9, 2025
Overflow problems in Hill functions Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SciML/Catalyst.jl#1187 · 6 comments · Opened Feb 18, 2025
non-negativity in coupled ODE-jump models Open

high priority

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1156 · 2 comments · Opened Dec 31, 2024
Network free models Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1139 · 1 comment · Opened Nov 26, 2024
Add support for interactivity and passing plot kwargs to graph plotting Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1137 · 2 comments · Opened Nov 25, 2024
add setup instructions to each tutorial Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1105 · 2 comments · Opened Nov 1, 2024
BifKit extension, conservation laws, and changing initial conditions Open

bug

SciML/Catalyst.jl#1095 · 21 comments · 1 assignee · Opened Oct 28, 2024
reenable format checking once working again Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SciML/Catalyst.jl#1083 · 1 comment · Opened Oct 18, 2024
move some functionality to sub-modules Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1081 · 1 comment · Opened Oct 18, 2024
Remove HomotopyContinuation extension once supported in MTK Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1079 · 4 comments · Opened Oct 17, 2024
scalarization in spatial code Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#1059 · 1 comment · Opened Sep 20, 2024
unintentional warnings from tests Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SciML/Catalyst.jl#1058 · 2 comments · Opened Sep 20, 2024
Thin out test dependencies Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

SciML/Catalyst.jl#1055 · 1 comment · Opened Sep 19, 2024
consider moving some extensions to separate libraries Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1032 · 25 comments · Opened Aug 27, 2024
Splitting off kinetic and structural properties of reaction networks Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1025 · 10 comments · Opened Aug 15, 2024
use MTK macro processing code instead of writing custom DSL code Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/Catalyst.jl#1023 · 3 comments · Opened Aug 14, 2024
Expand documentation to show plotting using the Makie recipe Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

SciML/Catalyst.jl#1012 · Opened Aug 5, 2024
fix and reenable Latexify tests Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

SciML/Catalyst.jl#1002 · Opened Jul 24, 2024
tutorials on using vector variables programattically Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SciML/Catalyst.jl#992 · Opened Jul 19, 2024
add option to generate propensity functions for CLE models Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/Catalyst.jl#986 · Opened Jul 15, 2024

SciML/Catalyst.jl

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