Comparison

Signed URL vs Chemister

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

Head to head
About

Signed URL

Features
Read full description

This APP demonstrates how an NHS3100 NTAG SmartSensor can be used for passive temperature monitoring. Besides this iOS APP, one needs to have the NHS3100 starter kit with the demo board. Other supported demonstration boards will become available. - Use the APP to configure the firmware - Use the background reading or a generic NFC reading APP such as NXP's Tag Info to read out the dynamically created URL and launch it in your webbrowser. The NTAG SmartSensor range of ICs extends NXP's NFC portfolio of passive NFC tags and smart electronic devices. NTAG SmartSensor devices are single-chip solutions combining the now ubiquitous NFC smartphone connectivity with autonomous sensing, data processing and validation, and logging. The NTAG SmartSensor is easy to use in an application by simply adding an NFC antenna and a battery. The devices are also versatile and can be easily combined with other companion chips like radios or sensor solutions. This APP interacts with the NXP's NHS3100 IC, optimized for temperature monitoring and logging. The temperature sensor offers an absolute accuracy of 0.3C. Each chip comes pre-calibrated and NXP provides a certificate with NIST traceability, easing the use of this IC for medical and pharmaceutical applications. NXP delivers for the NHS3100 a starter kit which is available for both macOS and Windows. Through this starter kit, developers can implement their own use cases, starting with this basic use case of temperature logging. NXP delivers the example code for both this iPhone APP and the corresponding firmware for the NHS3100. The starter kit can be ordered via the NXP website and NXPโ€™s distribution partners worldwide. Visit https://www.nxp.com/ntagsmartsensor for more information.

About

Chemister

Features
Read full description

Chemister is a free application for SIC4341 Flexsense - NFC Potentiostat sensor development kit developed by Silicon Craft Technology PLC. (SIC). Chronoamperometry (CA) measurement mode is supported by this application (IOS version). SIC4341 chip operating can be controlled through the setting on setup page. After the electrochemical measurement is completed, result will be displayed on the app and the data can be saved to mobile storage in text file.

Screenshots

Signed URL4 screens
Chemister4 screens

Verdict

The call

The clearest difference is update cadence: Chemister at every 4 months against Signed URL's every 22 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

Signed URL ships an update every 22 months, Chemister every 4 months. The most recent releases landed on September 22, 2026 and June 1, 2026 respectively.

Scorecard1 real difference ยท 5 level
Signed URL versus Chemister: the parameters behind the verdict, then further details
ParameterSigned URLChemister
PriceFreeFree
Update frequencyEvery 22 monthsEvery 4 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.013
Further details โ€” not scored
Size39 MB28 MB
Age rating4+4+
DeveloperNXP SemiconductorsSILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED

In-app purchases

None

Signed URL

No in-app purchases

None

Chemister

No in-app purchases

Questions

Is Signed URL free?
Signed URL is free to download, with no in-app purchases.
Is Chemister free?
Chemister is free to download, with no in-app purchases.
Do Signed URL or Chemister have ads?
Neither Signed URL nor Chemister shows ads.
Which is updated more often, Signed URL or Chemister?
Signed URL ships an update every 22 months, and Chemister every 4 months. Most recently, Signed URL was updated on September 22, 2026 and Chemister on June 1, 2026.

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