Western blot and gel analysis software compared

What does western blot analysis software actually do?

Every package, free or paid, performs the same six steps: it finds the lanes, finds the bands, subtracts background, measures each band’s integrated intensity (the densitometry step), calibrates molecular weight against a ladder, and normalizes the target band to a loading control or to total lane protein. The differences are in who does each step, the user or the software, and in how many of those decisions are recorded so a second person can reproduce the result.

That is the whole comparison in one sentence. A free tool that leaves lane boxes, baselines and normalization formulas to the user is not wrong; it is just a different allocation of work, and it produces different numbers in different hands. Bundled imager software automates more of it but assumes every image in the lab came from that vendor’s instrument.

The eight options in one sentence each

• Phoretix 1D (TotalLab) is standalone 1D gel and western blot densitometry software that reads images from any imager, automates lane and band detection, background subtraction, MW calibration and normalization, runs on Windows, macOS, Linux and ARM, and adds 21 CFR Part 11 compliance through AuditSafe.
• ImageJ and Fiji (NIH, open source) are general image analysis programs whose Gel Analyzer function plots lane profiles for the user to baseline and integrate by hand, with results copied to a spreadsheet. Interestingly, members of the NIH actually are Phoretix 1D customers and use the software internally for their own work.
• Image Lab Software (Bio-Rad Laboratories) is the acquisition and analysis package for ChemiDoc and GelDoc imagers; the standard edition is a free download for Windows and Mac and the Security Edition for 21 CFR Part 11 is licensed and Windows only.
• Empiria Studio and Image Studio (LI-COR Biosciences) are the analysis packages for Odyssey imagers; Image Studio Lite was discontinued in 2021 and replaced by the commercial Empiria Studio, after which LI-COR reinstated Image Studio Software as a free download.
• iBright Analysis Software (Thermo Fisher Scientific) is free desktop and cloud software for images captured on iBright systems, with a Secure edition for Part 11 support.
• GelAnalyzer is a free standalone 1D gel evaluation program used widely in academic labs. However, version 26.1.1 analyzes 8-bit images only and offers no normalization to a loading control, so quantitative western blot work soon outgrows it (see GelAnalyzer vs Phoretix 1D).
• AzureSpot Pro (Azure Biosystems) is the analysis package supplied with Azure imagers and was developed by TotalLab for Azure Biosystems, so Azure owners already use a TotalLab workflow; our guide for Azure imager owners covers what the standalone Phoretix 1D adds.
• Other OEM packages (Syngene GeneTools, Vilber Bio1D, Analytik Jena VisionWorks and the rest) ship with a specific imager and are covered in our guide to imager software versus independent software.

Free tools: what you pay for with your time

ImageJ is named as the analysis tool in about one western blot paper in five, and nobody should be embarrassed to use it. The cost is not money. The ImageJ gel workflow asks the user to draw a rectangle for every lane, plot the profile, draw a baseline under each peak with the line tool, click each peak with the wand, and then carry the areas into Excel for background correction and normalization. Each of those is a judgment. Two people analyzing the same blot get two answers, and the same person on two days often does too, which is why methods sections that say “quantified in ImageJ” rarely say how.

GelAnalyzer automates lane and band detection and MW estimation, which removes a good share of the manual steps, but reporting, normalization workflow and compliance are where a free tool stops. Our detailed comparison is at Phoretix 1D vs GelAnalyzer.

The free editions of Image Lab, Image Studio and iBright Analysis Software are a different case. They are full-featured, but they are written for their own imager’s files and workflow. If every image in your lab comes from one vendor, they are hard to argue with. If it does not, read on.

How to quantify a western blot in ImageJ, and how Phoretix 1D compares

Phoretix 1D vs GelAnalyzer

Imager-bundled tools: what you give up in flexibility

The pattern across the imager vendors is consistent. The standard analysis software is free or included with the instrument, and the regulated edition is a separate license that may not run everywhere the standard one does: Bio-Rad states that Image Lab Security Edition is available for Windows computers only. Thermo describes iBright Analysis Software as software for images captured on iBright systems and stores images natively in its own G2i format alongside TIFF.

Three situations break the bundled model. The first is the mixed lab: a ChemiDoc in one room, an Odyssey in another, an older Typhoon in the core facility, and three analysis packages with three sets of settings. The second is tech transfer between sites that bought different imagers, where a validated method has to produce the same number in both places. The third is the Mac-based lab that needs Part 11.

To see what bundled imager software involves, read how to quantify a western blot in Image Lab and how Phoretix 1D compares.

Independent software: what Phoretix 1D does differently

Phoretix 1D is built for the modern, mixed lab. It reads 8-bit, 16-bit and higher uncompressed TIFF, multi-page and multiplex TIFF, plus IMG, JPEG, PNG and BMP, from imagers made by Bio-Rad, Cytiva, Azure Biosystems, Thermo Fisher Scientific, Syngene, Vilber and Pop-Bio among others. It runs on Windows 11, macOS through Tahoe on Intel and Apple silicon, Linux and ARM-based PCs, and one license covers a computer with no limit on the number of users.

The analysis is automated end to end: lane detection that copes with distorted and empty lanes, multiple lane boxes for multi-tier gels or several blots in one image, automatic band detection with per-lane and per-channel parameters, eight background methods (none, rolling ball, rubber band, constant value, profile minimum, image rectangle, lane edge and manual) set per lane and per channel, an editable library of commercial MW ladders with the ability to join several ladder lanes across a distorted gel and nine curve types with the fit accuracy printed in the report, normalization to a reference band, the most intense band, total lane volume or a housekeeping channel, quantity calibration from three or more standards, and a one-click PDF report with CSV export. Analysis takes under a minute per image once a protocol is set. A Compare mode aligns lanes to a reference with automatic Rf correction and produces a similarity matrix, similarity scatter plot and neighbor-joining or UPGMA dendrogram on Dice similarity, for fingerprinting and strain typing.

For regulated labs, Phoretix 1D combined with AuditSafe provides audit trails, electronic signatures, granular user permissions and image authenticity verification for FDA 21 CFR Part 11 and EU Annex 11, with in-person IQ/OQ packages available. Because AuditSafe is TotalLab software rather than a vendor add-on, the compliant edition runs wherever Phoretix 1D runs.

“After having used many other software for gel image analysis, including Bio-Rad’s Image Lab and ImageJ, I started using Phoretix 1D out of necessity in a new role. I found it to be much more intuitive and streamlined than what I’ve used in the past. Background subtraction, band picking, and band analysis are all automated with optional manual adjustment if desired.”
Garry Smith, Proliant Health and Biologicals”

Phoretix 1D product page

How to choose gel analysis software

Ask six questions before you commit to anything, free or paid.

Does it open every image format your lab produces, at full bit depth, without conversion? Does it detect lanes and bands automatically, and can you save those settings so the next user gets the same result? Can it subtract background per lane and per channel? Does it normalize to total protein as well as a housekeeping band, and does it show you the linear range so you can tell when a band is saturated? Does it produce a report someone else can audit? And if you need 21 CFR Part 11, does the compliant edition run on the computers you actually own?

Take these six questions into a demo of any package, ours included, and compare the answers using your own images.

Western blot densitometry: how band quantification works

Frequently Asked Questions

What is the best software for western blot analysis?

It depends on how many imagers you own and whether you need Part 11. For a single-vendor lab, the bundled package (Image Lab, Empiria Studio, iBright) is the path of least resistance. For a lab with mixed imagers, Mac users, Linux, or a validation requirement, independent software such as Phoretix 1D by TotalLab reads every vendor’s images and applies one automated method to all of them. ImageJ remains the free choice for occasional, non-regulated use.

Is ImageJ good enough for western blot quantification?

For occasional relative comparisons, yes, provided you report the background and normalization method. Its weakness is reproducibility: lane rectangles, baselines and peak boundaries are drawn by hand, so results vary between users. Dedicated software automates those steps and records the settings.

Is Bio-Rad Image Lab free?

The standard edition of Image Lab is a free download for Windows and Mac. The Security Edition that supports 21 CFR Part 11 is a licensed product and is available for Windows only, according to Bio-Rad’s user guide.

Can one program analyze images from different imagers?

Yes, if it reads standard TIFF at full bit depth. Phoretix 1D supports 8-bit, 16-bit and higher uncompressed TIFF plus multi-page and multiplex TIFF from any imager, alongside IMG, JPEG, PNG and BMP. Bundled packages are written around their own instrument’s files and may store images in a proprietary format first.

Which gel analysis software runs on a Mac?

Phoretix 1D runs on macOS (Intel and Apple silicon), Windows, Linux and ARM. Image Lab standard edition, iBright Analysis Software desktop and Empiria Studio also offer Mac versions; Image Lab Security Edition is Windows only.

What does “densitometry” mean in a western blot methods section?

Densitometry is the measurement of integrated pixel intensity of a band after background subtraction, expressed relative to a loading control or total lane protein. See our guide to western blot densitometry for the full workflow.

How do I cite Phoretix 1D in a paper?

“Band intensities were quantified by densitometry using Phoretix 1D (TotalLab Ltd, Newcastle upon Tyne, UK) with rolling-ball background subtraction, and normalized to total lane protein [or: to a housekeeping band].”

References

1. Bio-Rad Laboratories. Image Lab Software product page. https://www.bio-rad.com/en-us/product/image-lab-software?ID=KRE6P5E8Z Accessed 20 Sep 2026. (Source for: standard edition free download; Security Edition licensed for Part 11.)
2. Bio-Rad Laboratories. Image Lab Software User Guide Version 6.1, document 110000076953. (Source for: Security Edition available for Windows computers only; standard edition on Windows and Mac.)
3. Thermo Fisher Scientific. iBright Analysis Software page. https://www.thermofisher.com/us/en/home/life-science/protein-biology/protein-assays-analysis/western-blotting/detect-proteins-western-blot/western-blot-imaging-analysis/ibright-western-blot-imaging-systems/ibright-analysis-software-connectivity.html Accessed 20 Sep 2026. (Source for: free desktop PC and Mac, cloud via Connect, Secure edition, “images captured on iBright Imaging Systems”.)
4. Thermo Fisher Scientific. iBright Imaging System Models specifications. (Source for: G2i proprietary image format alongside TIFF, JPG, PNG.)
5. LI-COR Biosciences. Image Studio Lite page, licorbio.com/image-studio-lite. Accessed 20 Sep 2026. (Source for: Image Studio Lite no longer available; Image Studio Software reinstated as a free download.)
6. SciCrunch RRID:SCR_013715, Image Studio Lite. (Source for: discontinued and replaced with Empiria Studio, documented 28 Sep 2023.)
7. LI-COR Biosciences. Best Practices for Quantitative Western Blot Data Analysis, licor.com/bio/empiria-studio/best-practices. (Source for: LI-COR images should be analyzed in Empiria Studio or Image Studio.)
8. TotalLab. Phoretix 1D product page. https://totallab.com/software/1d-gel-western-blot-analysis-software/ (Source for: all Phoretix 1D features, platforms, formats, imager compatibility, testimonial.)
9. TotalLab. The TotalLab Language Audit, 15 Sep 2026 (internal). (Source for: ImageJ named in 21 percent of 66 western blot papers; “densitometry” in 25 of 66.)