Downloads
Current versions
The current MATLAB, macOS (Apple M Chip), and Windows versions of Acycle are v3.1.1.
Acycle v3.1.1 was released August 13, 2026.
Important: The standalone editions listed below require MATLAB Runtime R2026a Update 4. They are not compatible with MATLAB Runtime R2020b.
v3.1.1 What's new
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RESTORED: Empirical Mode Decomposition tools.
EMD and EEMD are again available from the Timeseries menu. Their numerical core can also be used independently of the desktop GUI for programmatic and batch workflows.
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NEW: Reusable programmatic analysis interfaces.
Major filtering, interpolation, spectral, statistical, age-model, and time-series operations now provide validated numerical cores for scripts, batch workflows, automated testing, and future tool integration.
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FIXED: Spectral Analysis numerical and interface regressions.
MTM confidence levels, physical Nyquist frequency, frequency and period coordinates, and exact-NFFT zero padding are corrected. The SWA confidence selector, v2.8 colors and line styles, and several macOS layout and validation behaviors are also restored.
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FIXED: DYNOT and Power Decomposition compatibility.
Power Decomposition again preserves the target-band union, frequency clipping, window, and FFT behavior required by DYNOT. DYNOT confidence intervals retain the true median center, settings persist correctly, and the progress window now closes cleanly.
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FIXED: Evolutionary spectral-analysis and statistical displays.
Evolutionary FFT, periodogram, Lomb-Scargle, and MTM views retain the intended grids, limits, directions, logarithmic coordinates, and 3-D behavior. One-sample t-test visualization and the chi-square goodness-of-fit window title are also corrected.
Special thanks to Zhenglei Wu for valuable testing and debugging.
Acycle 3.1.1 MATLAB version
Option 1: Acycle3.1.1_MatLab.zip @ disk.pku.edu.cn.
Folder Name: Acycle
Expires: 2039-08-31 14:47
Option 2: Source code: zip / tar.gz (Acycle v3.1.1 on GitHub).
Standalone versions
Acycle v3.1.1 for macOS (Apple M Chip)
Acycle3.1.1_AppleMChip_Runtime2026a.zip (for Macs with Apple M-series chips only) [via Dropbox 
]
Folder Name: Acycle
Expires: 2039-08-31 14:47
Intel Chip is coming.
MATLAB Runtime R2026a Update 4 for macOS
*: This software is a stand-alone program. It was tested in macOS Sonoma Version 14.4.
**: MATLAB Runtime R2026a Update 4 (free) is required for the Acycle stand-alone software version 3.1.1. MATLAB Runtime R2020b is not compatible with Acycle v3.1.1.
Acycle v3.1.1 for Windows
Compressed package: Acycle3.1.1_Windows_R2026aUpdate4.zip [via Dropbox ]
Installer: Acycle3.1.1_Windows_R2026aUpdate4_Installer.zip
Folder Name: Acycle
Expires: 2039-08-31 14:47
MATLAB Runtime R2026a Update 4 for Windows
*: This software is a stand-alone program. It was tested in Windows 10.
**: MATLAB Runtime R2026a Update 4 (free) is required for the Acycle stand-alone software version 3.1.1. MATLAB Runtime R2020b is not compatible with Acycle v3.1.1.
Startup Fix
Windows
If Acycle 3.1.1 does not open and the console reports a missing module or DLL, follow the repair instructions for MATLAB Runtime R2026a Update 4.
Windows Startup Fix (English / 中文)
macOS
1. If Acycle does not respond and Terminal reports that libmwlaunchermain.dylib cannot be loaded, see the diagnosis and temporary runtime-library-path workaround.
Historical macOS Runtime Library Path Startup Issue Report for v3.0.2 (English / 中文)
2. If macOS reports that Acycle “is damaged and can’t be opened,” follow the Gatekeeper quarantine-removal instructions.
Download Users' Guide
More information: Users' Guide.
更多详情: 用户指南中文版.
Download Acycle Papers
Li et al., 2019 Computers & Geosciences
Li et al., 2025 Science China Earth Sciences
“Acycle: Enhanced time-series analysis software for geoscience research and education”
[Supplementary Materials]
This paper presents standardized recommendations for reporting data and parameters; following these recommendations will improve the reproducibility and reliability of research results. The supplementary materials include a demonstration case study and an Excel file for parameter documentation.