# Spectrometry vs DAC App

The clearest difference is review sentiment: Spectrometry at 100% against DAC App's 20%. Spectrometry also leads on rating (4.0 vs 1.8) and iOS requirement (11.0 vs 15.0). DAC App's advantage is ratings volume (16 vs 4). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Spectrometry holds the better App Store score, 4.0 against 1.8. Both are backed by a comparable volume of ratings — 4 and 16 respectively. Written reviews point the same way: 100% of Spectrometry's written reviews are positive against 20% of DAC App's.

Spectrometry ships an update every 6 months, DAC App every 12 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Spectrometry | DAC App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/spectrometry/id893384720/reviews)** | [1.8 (16 ratings)](https://appshunter.io/ios/app/dac-app/id1162772990/reviews) |
| Number of ratings | 4 | **16** |
| Positive reviews | **100.0% of reviews** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 43 MB | 16 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [PASCO scientific](https://appshunter.io/developer/361907184) | [Educational Testing Service](https://appshunter.io/developer/923503056) |

## What reviewers say

### Spectrometry

[App page](https://appshunter.io/ios/app/spectrometry/id893384720)

This application allows students and teachers to conduct spectrometry experiments using a wireless spectrometer. It measures and analyzes absorbance, transmittance, and fluorescence, supporting full spectrum analysis and Beer's law experiments. The software offers tools for calibration, comparison, and data plotting for educational purposes.

**Highlights:** Measure absorbance, transmittance, fluorescence, Full spectrum analysis, Beer's law and kinetics experiments, Compare multiple spectra, Calibrate dark and reference spectra, Plot absorbance and transmittance, Determine unknown concentration

**In-app purchases:** none


### DAC App

[App page](https://appshunter.io/ios/app/dac-app/id1162772990)

This free application simplifies the recording of student audio responses for specific AP exams. It streamlines the process for both students and proctors, and automatically uploads audio files for school staff. Designed for use on school-issued iPads.

**Highlights:** Record audio responses for AP exams, Simplify recording process, Intuitive interface for students, Streamline post-exam tasks, Direct upload of audio files, Designed for school-owned iPads

**In-app purchases:** none


## Frequently asked questions

### Is Spectrometry free?

Spectrometry is free to download, with no in-app purchases.

### Is DAC App free?

DAC App is free to download, with no in-app purchases.

### Which has better reviews, Spectrometry or DAC App?

Spectrometry is rated higher. Spectrometry averages 4.0 out of 5 from 4 ratings, while DAC App averages 1.8 from 16 ratings.

### Do Spectrometry or DAC App have ads?

Neither Spectrometry nor DAC App shows ads.

### Which is updated more often, Spectrometry or DAC App?

Spectrometry ships an update every 6 months, and DAC App every 12 months. Most recently, Spectrometry was updated on November 1, 2026 and DAC App on November 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*