PhotoMetrix vs Codon One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PhotoMetrix
This application performs univariate and multivariate data analysis using image acquisition and RGB histograms. It supports various color systems and can export data and charts via email for validation with other software.
- Univariate analysis with Single Linear Correlation
- Multivariate analysis with Principal Component Analysis (PCA)
- Image data acquisition via device camera
- RGB histogram conversion
- Support for RGB, HSV, HSL, and HSI color systems
- Email export of data, analysis, and charts
- Calculation of eigenvalues, eigenvectors, scores, and loadings
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This app employs Single Linear Correlation technics for univariate analysis and Principal Component Analysis (PCA) for multivariate exploratory analysis, including Partial Least Square Regression (PLS). The image data are acquired using the device main camera and photo album, both converted in RGB histograms. In addition, apart color channels of RGB, HSV, HSL and HSI systems are used during the univariate and multivariate processes. It is possible to send by e-mail the image data, analysis data and charts. In order to validate the obtained results, the same sets of data were tested using Microsoft Excel© and ChemoStat©. The results in both applications coincided in various combinations. This app calculates and plot: eigenvalues, eigenvectors, scores, loadings using Singular Value Decomposition in Multivariate Analysis. This app calculates and plot: slope (span), intercept (off-set) and regression (Pearson product-moment correlation coefficient) in Univariate Calibration Analysis. http://dx.doi.org/10.5935/0103-5053.20160182
Codon One
Master molecular biology, genetics, evolution, and life chemistry through interactive modules and quizzes. Explore essential concepts with clear diagrams and concise explanations. Includes helpful tools for sequence analysis and genetic code reference.
- Interactive learning modules
- Quick quizzes for comprehension
- Clear diagrams and plain language
- Molecule reference guide
- Sequence analysis tools
- Genetic code exploration
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Codon One helps you learn biology step by step, with short lessons, quick quizzes, flashcards, and a searchable glossary. Build a solid foundation in molecular biology, genetics, evolution, cell biology, development, and the history of science. Each section breaks complex ideas into clear explanations, diagrams, and focused checks for understanding. Core course (Modules) Module 1: Chemistry of Life – atoms & elements, bonds, water, pH, biomolecules Module 2: Genetics – chromosomes, replication, transcription, translation, regulation Module 3: Evolution – history of life, phylogeny, selection, drift, speciation, molecular evolution Module 4: History of Science – ideas, methods, and experiments that shaped modern biology Module 5: Cell Biology – membranes & transport, organelles & energy, cytoskeleton, signaling, cell division Module 6: Development – fertilization & body plans, differentiation, pattern formation & morphogenesis, growth & repair, evo-devo Additional topics are planned for future updates, including Animal Physiology, Microbiology & Immunology, Plant Biology, and more. Glossary & Flashcards Look up the essentials in one place - key terms from every module, plus the 20 amino acids and the nucleobases. Turn any topic into a flashcard deck and review with smart, spaced practice that focuses on the cards you find hardest. Quiz & Progress Practice across biochemistry, genetics, evolution, cell biology, development, and science history in a dedicated quiz area. Track improvement with success rates and per-topic stats, and let the app resurface your weak questions for targeted review. Keep a daily streak going to build a steady habit. Got a good question? Submit it directly from the app. Built-in Tools Sequence Operator: paste DNA, reverse or complement it, transcribe to RNA, translate in all six reading frames, and view length, GC content, and melting temperature. Codon Picker: explore the genetic code, see which codons map to each amino acid or stop signal, and tweak bases to see the effect. Triplet Encoder: write a message in amino-acid single-letter code and encode it as a DNA triplet sequence, then decode it by translation. Found a bug or have suggestions? Email info@codon-one.com - we read every message.
Screenshots
Verdict
The clearest difference is in-app purchases: PhotoMetrix at none against Codon One's 7. Codon One's advantage is review sentiment (76% vs 67%). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Codon One sells 7 one-off in-app purchases. PhotoMetrix asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 11, 2026 and October 29, 2026 respectively.
| Parameter | PhotoMetrix | Codon One |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (25 ratings) — better |
| Positive reviews | 66.7% of reviews | 76.5% of reviews — better |
| Number of ratings | — | 25 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 — better | 15.6 |
| Further details — not scored | ||
| Size | 27 MB | 277 MB |
| Age rating | 4+ | 4+ |
| Developer | Gilson Augusto Helfer | Daniel Gebert |
Customer experience
PhotoMetrix
Codon One
In-app purchases
PhotoMetrix
No in-app purchases
Codon One
- Module 2: GeneticsFree
- Module 1: Chemistry of LifeFree
- Module 3: Evolution$2.99
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- Module 4: Science History$2.99
- Module 5: Cell Biology$2.99
- Module 6: Development$2.99
- Unlock All$8.99
Questions
Is PhotoMetrix free?
Is Codon One free?
Do PhotoMetrix or Codon One have ads?
Which is updated more often, PhotoMetrix or Codon One?
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