Comparison

CenTelum vs OSpectrometer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CenTelum

Features
Read full description

CenTelum provides asset tracking and inventory management using handheld RFID reader.

About

OSpectrometer

This app uses your device's camera and screen to perform basic optical spectroscopy. Analyze the visible light spectrum of objects, map light wavelengths to RGB values, and save or share your findings. It functions offline without external hardware.

Highlights
  • Visible light spectrum analysis
  • RGB color value mapping
  • Wavelength selection and scanning
  • Front camera reflection sensing
  • Save and share results
  • Offline functionality
Features
Read full description

Optical spectroscopy in the visible light spectrum is a commonly used tool in different fields such as health, manufacturing, art, and forensic research. OSpectrometer implements basic spectrometer functions using the built-in camera and screen without requiring external devices or programs. - Visible light spectrum is transformed and mapped to a function that generates RGB (Red Green Blue) color values - A specific light wavelength can be selected and used to illuminate a desired target (i.e., close to the screen) - The whole spectrum or a specific part of the spectrum can be selected and scanned - Front camera is used to sense the reflection from the target object - Consistent and repeatable reflection/absorption amplitude with respect to the color spectrum - The result can be saved and shared - Works offline, no need to connect to any network or internet Privacy-policy: https://software.nanorescenter.com/osprectrometer-privacy-policy Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CenTelum4 screens
OSpectrometer4 screens

Verdict

The call

The clearest difference is in-app purchases: CenTelum at none against OSpectrometer's 2. CenTelum also leads on update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OSpectrometer sells 2 in-app purchases, starting at $2.99 per month. CenTelum asks for nothing beyond the download.

UpkeepUpdate frequency

CenTelum ships an update every 4 days, OSpectrometer every 2 weeks. The most recent releases landed on October 30, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 8 level
CenTelum versus OSpectrometer: the parameters behind the verdict, then further details
ParameterCenTelumOSpectrometer
PriceFreeFree
Rating—2.0 (4 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—4 — better
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.1 — better15.1
Further details — not scored
Size4 MB71 MB
Age rating4+4+
DeveloperCenango Financial, LLCNANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI

In-app purchases

None

CenTelum

No in-app purchases

2 purchases

OSpectrometer

Subscriptions2
  • month3 Days trial$2.991 Month
  • year3 Days trial$9.991 Year

Questions

Is CenTelum free?
CenTelum is free to download, with no in-app purchases.
Is OSpectrometer free?
OSpectrometer is free to download, with in-app purchases available.
Do CenTelum or OSpectrometer have ads?
Neither CenTelum nor OSpectrometer shows ads.
Which is updated more often, CenTelum or OSpectrometer?
CenTelum ships an update every 4 days, and OSpectrometer every 2 weeks. Most recently, CenTelum was updated on October 30, 2026 and OSpectrometer on October 15, 2026.

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