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canonical: https://biosonic.io/compare/kaleidoscope
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# BioSonic vs Kaleidoscope Pro

Last updated: 2026-04-25. Written by the BioSonic team.

Two bat sound classifiers, tested independently, compared head to head. One built for the desktop era, one built for what comes next. Fifteen dimensions, real numbers, no spin.

## Key stats

- **98.7%** — BioSonic F1 Score (vs 73.0% for Kaleidoscope Pro)
- **13.4x** — Fewer false positives (BioSonic vs Kaleidoscope Pro)
- **16.3x** — Fewer missed bats (BioSonic vs Kaleidoscope Pro)
- **327** — Hours saved per year (reported by RPS Group, UK)

## What is bat sound analysis software?

Bat sound analysis software takes ultrasonic recordings captured by bat detectors in the field and automatically identifies which bat species are present. Ecologists use these tools during environmental impact assessments, infrastructure planning, and biodiversity monitoring to determine bat species composition, activity levels, and behaviour patterns at survey sites.

The two most widely discussed tools in this space are **BioSonic**, a cloud-based AI platform, and **Kaleidoscope Pro** by Wildlife Acoustics, a desktop application that has been used by ecologists for over a decade. This page compares them across accuracy, identification approach, workflow, team collaboration, geographic coverage, and value. If you are evaluating bat classifiers for your consultancy or research group, this is the page to bookmark.

For comparisons with other tools, see our [full comparison hub](/compare). For detailed accuracy data, visit our [benchmarks page](/benchmarks).

## Feature-by-feature breakdown

Fifteen rows, covering everything from underlying technology to pricing and support. Where one tool has a clear advantage, the cell is highlighted.

| Feature | BioSonic | Kaleidoscope Pro |
|---|---|---|
| Underlying approach | **Deep learning image recognition on spectrograms** | HMM with Fisher scores and winnow classifiers (Agranat 2013) |
| Training data | **2.5M bat calls + 4M noise files, curated by 12 bat experts** | Several hundred thousand recordings |
| Benchmarked accuracy | **98.7% F1 in a third-party benchmark by Wilder Sensing (6,126 calls, 15 species) vs Kaleidoscope's 73.0%** | ~73% F1 on the same third-party benchmark |
| Platform | **Browser-based — works on any computer** | Windows or macOS desktop |
| Team workflow | **Unlimited users per organisation; admin/editor/viewer roles; shared projects** | Single-user licence, 2 device activations; Managed Cloud as add-on |
| Species per recording | **Up to 7** | 1 |
| Social and feeding calls | **Separated automatically** | Combined |
| Noise filtering | **Deep-learning noise model trained on 4M non-bat recordings** | Simpler algorithm based on Zero crossing |
| Model updates | **New AI model every weekend** | When software version updates |
| Storage | **9 years EU-hosted included** | BYO storage; Managed Cloud add-on |
| Report generation | **One-click charts, maps, Word export** | CSV export to Excel |
| Detector compatibility | Any WAV-producing detector (Audiomoth, Song Meter, Batlogger, Pettersson, etc.) | **Same (full-spectrum) + ZC files** |
| Geographic coverage | UK, Netherlands, Denmark, Germany, Sweden, Belgium, France, Poland, Finland, Norway (all EUROBATS species) | **UK, Europe, North America, South Africa, Neotropics** |
| Pricing model | **Per-GB-per-year, all-inclusive; contact for quote** | $399 USD / £425 inc VAT single annual subscription (NHBS lists £354.17 ex VAT); Managed Cloud extra |
| Free trial | **Yes ([sign up at bat.biosonic.se/signup](https://bat.biosonic.se/signup))** | 15-day trial |

## How each tool identifies bats

The fundamental difference between BioSonic and Kaleidoscope Pro is in how they process bat recordings. Understanding this difference explains why their accuracy numbers diverge so significantly.

### BioSonic: deep learning on spectrograms

BioSonic converts each audio file into a spectrogram image and passes it through a convolutional neural network trained on 2.5 million bat calls and 3.5 million noise files. The model was curated by 12 bat experts across five European countries. Because it operates on the full spectrogram image, BioSonic can detect multiple species in a single recording (up to 7), recognise partial calls, and distinguish between echolocation, feeding buzzes, and social calls.

The deep-learning noise model, trained on 3.5 million non-bat recordings, means BioSonic can reject rain, wind, insects, and equipment noise with high precision. This is a major reason for its low false positive rate (0.3% in the Wilder Sensing benchmark).

New models are deployed every weekend. Each model incorporates the latest expert-validated training data and feedback from users across the platform. This means the classifier improves continuously, without requiring any action from the user.

### Kaleidoscope Pro: HMM-based classifiers

Kaleidoscope Pro uses Hidden Markov Models (HMMs) with Fisher scores and winnow classifiers to detect and classify bat calls (Agranat 2013). The classifier is updated with new software releases, typically every 2–3 years.

This approach has been refined over many years and performs well on clean recordings of common species. It is less effective on noisy recordings, rare species with limited reference data, and recordings where multiple bat species overlap. Because it assigns one species per recording, multi-species passes are resolved by selecting the most likely candidate rather than reporting all species present.

For a detailed breakdown of how these approaches perform in independent tests, see our [benchmarks page](/benchmarks).

## Accuracy: the numbers that matter

### The Wilder Sensing benchmark (2024)

[Wilder Sensing](/benchmarks) independently tested BioSonic and Kaleidoscope Pro against expert manual identification across 6,126 bat calls covering 15 species. The results were unambiguous:

- **BioSonic F1 score: 98.7%** -- near-perfect agreement with expert identification
- **Kaleidoscope Pro F1 score: 73.0%** -- significantly lower, especially on rare species
- BioSonic produced **13.4 times fewer false positives** -- fewer noise files misidentified as bats
- BioSonic produced **16.3 times fewer missed bats** -- fewer real bat calls left undetected

BioSonic matched or exceeded manual expert identification on 14 of the 15 species tested. For rare and acoustically similar species -- where classification errors have the greatest ecological impact -- BioSonic's advantage was most pronounced.

### Third-party benchmark by Wilder Sensing

In an independent benchmark by Wilder Sensing on 6,126 bat calls across 15 species, BioSonic achieved **98.7% F1**, ranking first among all classifiers tested.

### Why accuracy matters in practice

A false positive -- classifying noise as a bat -- forces an ecologist to spend time verifying phantom detections. A missed bat -- failing to detect a real bat call -- means species presence goes unrecorded, which can lead to inadequate protection measures in planning decisions.

With Kaleidoscope Pro's 4.0% false positive rate, a dataset of 100,000 files would generate approximately 4,000 false detections requiring manual review. BioSonic's 0.3% rate would generate roughly 300 -- saving dozens of hours of review time on a single project. Multiply that across a full survey season and the time saving compounds into hundreds of hours. For more on how this translates to real project savings, see our [product page](/product).

## Behaviour classification: beyond species ID

Knowing which species is present is only part of the picture. For many regulatory frameworks and conservation assessments, ecologists also need to understand what the bats are doing. Are they commuting through an area, actively foraging, or engaging in social behaviour that indicates a roost nearby?

BioSonic automatically classifies bat vocalisations into three behaviour categories:

- **Echolocation calls** -- standard navigation and commuting activity
- **Feeding buzzes** -- rapid call sequences indicating active prey capture, which signals foraging habitat
- **Social calls** -- communication vocalisations that often indicate roost proximity or mating activity

Kaleidoscope Pro combines social and feeding calls together and does not separate them automatically. Users who need this separation must perform manual spectrogram review or use additional software, adding time and complexity to their workflow.

The distinction between feeding and social calls is not a nice-to-have. It is directly relevant to habitat assessments under UK planning guidelines and EUROBATS recommendations. A site where bats are feeding is ecologically more significant than one they are simply transiting through, and the mitigation requirements differ accordingly.

## Working as a team

Ecological consultancies are not solo operations. A typical bat survey project involves field ecologists, data analysts, project managers, and sometimes external reviewers or client stakeholders. The tools you use need to support that reality.

### BioSonic: built for teams from the start

BioSonic includes unlimited users per organisation at no extra cost. Every team member -- whether they are an admin, editor, or viewer -- accesses the same project data through the browser. There is nothing to install on individual machines, no licence keys to manage, and no per-seat charges that make you think twice about giving a junior ecologist access.

Projects are shared by default within your organisation. An ecologist in the field can upload recordings from their phone or laptop. A colleague back in the office can begin reviewing results before the field team returns. A project manager can check progress and export reports without needing their own copy of the software or the original audio files.

All data is stored in EU-hosted cloud infrastructure with 9 years of retention included. There is no need to maintain your own file servers or worry about hard drive failures destroying irreplaceable survey data.

### Kaleidoscope Pro: single-user by default

Kaleidoscope Pro requires one licence for processing. Once data is processed, the free version of Kaleidoscope can be used to open and manually vet results, so teams do not necessarily need multiple paid licences. Wildlife Acoustics also offers a Managed Cloud add-on for centralised storage and sharing.

> "Since joining BioSonic our analysis time has reduced significantly. The team is excellent in their support, super quick to respond."
>
> — Luke Waddison, Ecological Consultant, [Wharton](/wharton) (UK)

## Workflow: cloud vs desktop

### BioSonic: browser-based, no installation

BioSonic runs entirely in the browser. Upload WAV files from any device, and the platform handles all processing server-side. Results appear in an interactive dashboard with spectrograms, species heatmaps, activity timelines, and GPS transect views. Team members can review and approve classifications collaboratively, and export client-ready reports -- including Word documents with charts and maps -- directly from the platform.

There is nothing to install, no software updates to manage, and no per-seat licence to track. Your entire team accesses the same project data through the browser, on any operating system.

### Kaleidoscope Pro: desktop installation

Kaleidoscope Pro is a desktop application that must be installed on Windows or macOS. Audio files are processed locally on the user's machine. Collaboration requires sharing files or exports outside the application. One licence is needed for processing; the free version can be used for manual vetting.

For solo practitioners or small teams working in a single location, this workflow can be sufficient. For distributed teams, multi-site projects, or organisations that want centralised data management, the desktop model introduces friction that a cloud platform avoids.

Report output from Kaleidoscope Pro is CSV-based, which means you export to Excel and build your own charts and tables. BioSonic generates one-click charts, interactive maps, and formatted Word exports that are ready to include in client reports without additional formatting work.

## Who should choose which

Both BioSonic and Kaleidoscope Pro are serious tools used by professional ecologists. The right choice depends on your specific situation.

### Kaleidoscope Pro may be the better fit if:

- You work primarily in **North America, South Africa, or the Neotropics** -- regions where BioSonic does not yet have coverage
- You need to process **zero-crossing (ZC) files** from older Anabat or other ZC-based detectors
- You are a **solo practitioner** who prefers local desktop processing and does not need team collaboration features
- You already have an established workflow built around Kaleidoscope Pro and the switching cost outweighs the accuracy gain for your specific use case

### BioSonic is likely the better fit if:

- You work in the **UK, Netherlands, Denmark, Germany, Sweden, Belgium, France, Poland, Finland, or Norway** and need the highest available accuracy on European species
- You need **behaviour classification** (feeding buzzes and social calls separated) for habitat assessments
- You work in a **team** and want shared projects, role-based access, and centralised data without per-seat licensing
- You want **report-ready output** -- charts, maps, and Word exports -- without building everything in Excel
- You process **large volumes** and need a noise model that minimises false positives to cut manual review time
- You want a classifier that **improves continuously** with weekly model updates rather than waiting for software releases

If you are unsure, the simplest test is to upload a representative sample of your own recordings to both tools and compare the results. BioSonic offers a [free trial](https://bat.biosonic.se/signup) for exactly this purpose.

## Switching from Kaleidoscope Pro to BioSonic

If you currently use Kaleidoscope Pro, migrating to BioSonic is straightforward:

- **Same input files** -- BioSonic accepts the same WAV files from all major bat detectors (Wildlife Acoustics Song Meter, Echo Meter, Batlogger, AudioMoth, Pettersson, and more)
- **No format conversion** -- upload your existing recordings directly
- **Re-analyse historical data** -- upload past recordings to get BioSonic's higher-accuracy classifications alongside behaviour labels
- **No installation required** -- open the browser and start uploading
- **Bring your whole team** -- unlimited users are included, so every analyst gets access from day one

Many BioSonic users previously used Kaleidoscope Pro and switched after comparing results on their own data. We encourage you to do the same -- upload a representative sample and compare the classifications yourself.

## Pricing comparison

Kaleidoscope Pro is a single annual subscription — $399 USD direct from Wildlife Acoustics, or £425 inc VAT (£354.17 ex VAT) from NHBS in the UK (May 2026). One licence covers processing, and the free version can be used for manual vetting. Managed Cloud storage is available as an optional add-on.

BioSonic uses per-GB-per-year pricing that includes all features, unlimited users, EU-hosted storage with 9 years of retention, and weekly model updates. [Contact us for a quote](mailto:josef.carlson@biosonic.se) tailored to your analysis volume.

## Frequently asked

### Which is more accurate, BioSonic or Kaleidoscope Pro?

In an [independent benchmark](/benchmarks) by Wilder Sensing, BioSonic achieved a 98.7% F1 score compared to Kaleidoscope Pro's 73.0% on the same dataset of 6,126 calls across 15 species. BioSonic also produced 13.4 times fewer false positives and 16.3 times fewer missed bats. See our [benchmarks page](/benchmarks) for the full data.

### Can I switch from Kaleidoscope Pro to BioSonic?

Yes. BioSonic accepts the same WAV files you already record with Wildlife Acoustics detectors (Song Meter, Echo Meter) as well as Batlogger, AudioMoth, Pettersson, and all other standard full-spectrum bat detectors. Upload your existing recordings and get results immediately -- no format conversion needed. You can also re-analyse historical datasets.

### Does BioSonic require software installation?

No. BioSonic runs entirely in your web browser on any operating system. There is nothing to download, install, or update. Kaleidoscope Pro requires a desktop installation on Windows or macOS.

### Does BioSonic detect feeding buzzes and social calls?

Yes. BioSonic automatically separates bat vocalisations into echolocation calls, feeding buzzes, and social calls. Kaleidoscope Pro combines social and feeding calls together. For habitat assessments where behaviour classification matters, this distinction is significant.

### How many species can BioSonic identify per recording?

BioSonic can identify up to 7 species per recording. This is important for recordings that capture multiple bats passing simultaneously -- a common occurrence at roost emergence sites and along commuting corridors. Kaleidoscope Pro's Auto-ID assigns a single best-match species per recording (a probability list is available in detail mode, but the headline output is single-species). In multi-bat recordings — common at roost emergence sites — this can miss additional species present in the same file.

### How often does BioSonic update its AI model?

BioSonic deploys a new AI model every weekend. Each model incorporates the latest training data, expert feedback, and performance improvements. Users do not need to do anything -- the updated model is available automatically the following Monday. Kaleidoscope Pro updates only when a new software version is released, which typically happens a few times per year.

### Which countries does each tool cover?

BioSonic currently covers the UK, Netherlands, Denmark, Germany, Sweden, Belgium, France, Poland, Finland, and Norway, supporting all EUROBATS species in those regions. Coverage is expanding. Kaleidoscope Pro covers a broader geographic range including UK, Europe, North America, South Africa, and the Neotropics. If you work outside BioSonic's current coverage area, Kaleidoscope Pro may be the better option today.

### How does pricing compare between BioSonic and Kaleidoscope Pro?

BioSonic uses per-GB-per-year pricing that includes all features, unlimited users, and EU-hosted storage. Contact us for a quote. Kaleidoscope Pro is a single annual subscription — $399 USD direct from Wildlife Acoustics, or £425 inc VAT (£354.17 ex VAT) from NHBS in the UK (May 2026). One licence covers processing; the free version can be used for manual vetting. Managed Cloud is available as an optional add-on. For more detail, see our [FAQ page](/faq).

## Sources

- Agranat, I. (2013). "Automatically identifying animal species from their vocalizations on the Kaleidoscope platform." J. Acoust. Soc. Am. 134(5), doi:10.1121/1.4799403
- Wilder Sensing (2024). Independent benchmark on 6,126 calls across 15 species — [see benchmarks page](/benchmarks)
- NHBS pricing for Kaleidoscope Pro: £425 inc VAT (£354.17 ex VAT), May 2026. Wildlife Acoustics direct: $399 USD.
- Wildlife Acoustics: [wildlifeacoustics.com](https://www.wildlifeacoustics.com)

Last verified: 2026-04-26.

## Ready to compare on your own data?

Upload a sample dataset and see the difference for yourself. No installation, no commitment, no credit card.

[Start free trial](https://bat.biosonic.se/signup) | [Book a demo](https://cal.com/biosonic/30min)

Or email [josef.carlson@biosonic.se](mailto:josef.carlson@biosonic.se) | +46 72 744 65 85